mirror of https://github.com/apache/cloudstack.git
1427 lines
54 KiB
Python
1427 lines
54 KiB
Python
#!/usr/bin/env python3
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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"""
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POC "imageio-like" HTTP server backed by NBD over Unix socket or a local file.
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Supports two backends (see config payload):
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- nbd: proxy to an NBD server via Unix socket (socket path, export, export_bitmap); supports range reads/writes, extents, zero, flush.
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- file: read/write a local qcow2 (or raw) file path; full PUT only (no range writes), GET with optional ranges, flush.
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How to run
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----------
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- Install dependency:
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dnf install python3-libnbd
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or
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apt install python3-libnbd
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- Run server:
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createImageTransfer will start the server as a systemd service 'cloudstack-image-server'
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Example curl commands
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--------------------
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- OPTIONS:
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curl -i -X OPTIONS http://127.0.0.1:54323/images/demo
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- GET full image:
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curl -v http://127.0.0.1:54323/images/demo -o demo.img
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- GET a byte range:
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curl -v -H "Range: bytes=0-1048575" http://127.0.0.1:54323/images/demo -o first_1MiB.bin
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- PUT full image (Content-Length must equal export size exactly):
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curl -v -T demo.img http://127.0.0.1:54323/images/demo
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- GET extents (zero/hole extents from NBD base:allocation):
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curl -s http://127.0.0.1:54323/images/demo/extents | jq .
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- GET extents with dirty and zero (requires export_bitmap in config):
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curl -s "http://127.0.0.1:54323/images/demo/extents?context=dirty" | jq .
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- POST flush:
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curl -s -X POST http://127.0.0.1:54323/images/demo/flush | jq .
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- PATCH zero (zero a byte range; application/json body):
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curl -k -X PATCH \
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-H "Content-Type: application/json" \
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--data-binary '{"op": "zero", "offset": 4096, "size": 8192}' \
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http://127.0.0.1:54323/images/demo
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Zero at offset 1 GiB, 4096 bytes, no flush:
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curl -k -X PATCH \
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-H "Content-Type: application/json" \
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--data-binary '{"op": "zero", "offset": 1073741824, "size": 4096}' \
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http://127.0.0.1:54323/images/demo
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Zero entire disk and flush:
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curl -k -X PATCH \
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-H "Content-Type: application/json" \
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--data-binary '{"op": "zero", "size": 107374182400, "flush": true}' \
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http://127.0.0.1:54323/images/demo
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- PATCH flush (flush data to storage; operates on entire image):
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curl -k -X PATCH \
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-H "Content-Type: application/json" \
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--data-binary '{"op": "flush"}' \
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http://127.0.0.1:54323/images/demo
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- PATCH range (write binary body at byte range; Range + Content-Length required):
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curl -v -X PATCH -H "Range: bytes=0-1048576" --data-binary @chunk.bin \
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http://127.0.0.1:54323/images/demo
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"""
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import argparse
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import json
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import logging
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import os
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import socket
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import threading
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import time
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from http import HTTPStatus
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from http.server import BaseHTTPRequestHandler, HTTPServer
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from socketserver import ThreadingMixIn
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try:
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from http.server import ThreadingHTTPServer
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except ImportError:
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# Python 3.6: ThreadingHTTPServer was added in 3.7
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class ThreadingHTTPServer(ThreadingMixIn, HTTPServer):
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pass
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from typing import Any, Dict, List, Optional, Set, Tuple
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from urllib.parse import parse_qs
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import nbd
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CHUNK_SIZE = 256 * 1024 # 256 KiB
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# NBD base:allocation flags (hole=1, zero=2; hole|zero=3)
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_NBD_STATE_HOLE = 1
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_NBD_STATE_ZERO = 2
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# NBD qemu:dirty-bitmap flags (dirty=1)
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_NBD_STATE_DIRTY = 1
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# Concurrency limits across ALL images.
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MAX_PARALLEL_READS = 8
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MAX_PARALLEL_WRITES = 1
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_READ_SEM = threading.Semaphore(MAX_PARALLEL_READS)
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_WRITE_SEM = threading.Semaphore(MAX_PARALLEL_WRITES)
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# In-memory per-image lock: single lock gates both read and write.
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_IMAGE_LOCKS: Dict[str, threading.Lock] = {}
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_IMAGE_LOCKS_GUARD = threading.Lock()
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# Dynamic image_id(transferId) -> backend mapping:
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# CloudStack writes a JSON file at /tmp/imagetransfer/<transferId> with:
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# - NBD backend: {"backend": "nbd", "socket": "/tmp/imagetransfer/<id>.sock", "export": "vda", "export_bitmap": "..."}
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# - File backend: {"backend": "file", "file": "/path/to/image.qcow2"}
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#
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# This server reads that file on-demand.
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_CFG_DIR = "/tmp/imagetransfer"
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_CFG_CACHE: Dict[str, Tuple[float, Dict[str, Any]]] = {}
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_CFG_CACHE_GUARD = threading.Lock()
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def _json_bytes(obj: Any) -> bytes:
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return json.dumps(obj, separators=(",", ":"), ensure_ascii=False).encode("utf-8")
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def _merge_dirty_zero_extents(
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allocation_extents: List[Tuple[int, int, bool]],
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dirty_extents: List[Tuple[int, int, bool]],
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size: int,
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) -> List[Dict[str, Any]]:
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"""
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Merge allocation (start, length, zero) and dirty (start, length, dirty) extents
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into a single list of {start, length, dirty, zero} with unified boundaries.
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"""
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boundaries: Set[int] = {0, size}
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for start, length, _ in allocation_extents:
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boundaries.add(start)
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boundaries.add(start + length)
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for start, length, _ in dirty_extents:
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boundaries.add(start)
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boundaries.add(start + length)
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sorted_boundaries = sorted(boundaries)
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def lookup(
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extents: List[Tuple[int, int, bool]], offset: int, default: bool
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) -> bool:
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for start, length, flag in extents:
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if start <= offset < start + length:
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return flag
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return default
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result: List[Dict[str, Any]] = []
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for i in range(len(sorted_boundaries) - 1):
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a, b = sorted_boundaries[i], sorted_boundaries[i + 1]
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if a >= b:
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continue
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result.append(
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{
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"start": a,
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"length": b - a,
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"dirty": lookup(dirty_extents, a, False),
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"zero": lookup(allocation_extents, a, False),
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}
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)
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return result
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def _is_fallback_dirty_response(extents: List[Dict[str, Any]]) -> bool:
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"""True if extents is the single-extent fallback (dirty=false, zero=false)."""
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return (
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len(extents) == 1
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and extents[0].get("dirty") is False
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and extents[0].get("zero") is False
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)
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def _get_image_lock(image_id: str) -> threading.Lock:
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with _IMAGE_LOCKS_GUARD:
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lock = _IMAGE_LOCKS.get(image_id)
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if lock is None:
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lock = threading.Lock()
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_IMAGE_LOCKS[image_id] = lock
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return lock
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def _now_s() -> float:
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return time.monotonic()
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def _safe_transfer_id(image_id: str) -> Optional[str]:
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"""
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Only allow a single filename component to avoid path traversal.
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We intentionally keep validation simple: reject anything containing '/' or '\\'.
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"""
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if not image_id:
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return None
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if image_id != os.path.basename(image_id):
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return None
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if "/" in image_id or "\\" in image_id:
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return None
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if image_id in (".", ".."):
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return None
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return image_id
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def _load_image_cfg(image_id: str) -> Optional[Dict[str, Any]]:
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safe_id = _safe_transfer_id(image_id)
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if safe_id is None:
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return None
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cfg_path = os.path.join(_CFG_DIR, safe_id)
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try:
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st = os.stat(cfg_path)
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except FileNotFoundError:
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return None
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except OSError as e:
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logging.error("cfg stat failed image_id=%s err=%r", image_id, e)
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return None
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with _CFG_CACHE_GUARD:
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cached = _CFG_CACHE.get(safe_id)
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if cached is not None:
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cached_mtime, cached_cfg = cached
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# Use cached config if the file hasn't changed.
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if float(st.st_mtime) == float(cached_mtime):
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return cached_cfg
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try:
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with open(cfg_path, "rb") as f:
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raw = f.read(4096)
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except OSError as e:
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logging.error("cfg read failed image_id=%s err=%r", image_id, e)
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return None
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try:
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obj = json.loads(raw.decode("utf-8"))
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except Exception as e:
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logging.error("cfg parse failed image_id=%s err=%r", image_id, e)
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return None
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if not isinstance(obj, dict):
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logging.error("cfg invalid type image_id=%s type=%s", image_id, type(obj).__name__)
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return None
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backend = obj.get("backend")
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if backend is None:
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backend = "nbd"
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if not isinstance(backend, str):
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logging.error("cfg invalid backend type image_id=%s", image_id)
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return None
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backend = backend.lower()
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if backend not in ("nbd", "file"):
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logging.error("cfg unsupported backend image_id=%s backend=%s", image_id, backend)
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return None
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if backend == "file":
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file_path = obj.get("file")
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if not isinstance(file_path, str) or not file_path.strip():
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logging.error("cfg missing/invalid file path for file backend image_id=%s", image_id)
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return None
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cfg = {"backend": "file", "file": file_path.strip()}
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else:
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socket_path = obj.get("socket")
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export = obj.get("export")
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export_bitmap = obj.get("export_bitmap")
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if not isinstance(socket_path, str) or not socket_path.strip():
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logging.error("cfg missing/invalid socket path for nbd backend image_id=%s", image_id)
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return None
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socket_path = socket_path.strip()
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if export is not None and (not isinstance(export, str) or not export):
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logging.error("cfg missing/invalid export image_id=%s", image_id)
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return None
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cfg = {
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"backend": "nbd",
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"socket": socket_path,
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"export": export,
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"export_bitmap": export_bitmap,
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}
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with _CFG_CACHE_GUARD:
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_CFG_CACHE[safe_id] = (float(st.st_mtime), cfg)
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return cfg
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class _NbdConn:
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"""
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Small helper to connect to NBD over a Unix socket.
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Opens a fresh handle per request, per POC requirements.
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"""
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def __init__(
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self,
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socket_path: str,
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export: Optional[str],
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need_block_status: bool = False,
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extra_meta_contexts: Optional[List[str]] = None,
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):
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self._sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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self._sock.connect(socket_path)
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self._nbd = nbd.NBD()
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# Select export name if supported/needed.
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if export and hasattr(self._nbd, "set_export_name"):
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self._nbd.set_export_name(export)
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# Request meta contexts before connect (for block status / dirty bitmap).
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if need_block_status and hasattr(self._nbd, "add_meta_context"):
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for ctx in ["base:allocation"] + (extra_meta_contexts or []):
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try:
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self._nbd.add_meta_context(ctx)
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except Exception as e:
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logging.warning("add_meta_context %r failed: %r", ctx, e)
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self._connect_existing_socket(self._sock)
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def _connect_existing_socket(self, sock: socket.socket) -> None:
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# Requirement: attach libnbd to an existing socket / FD (no qemu-nbd).
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# libnbd python API varies slightly by version, so try common options.
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last_err: Optional[BaseException] = None
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if hasattr(self._nbd, "connect_socket"):
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try:
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self._nbd.connect_socket(sock)
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return
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except Exception as e: # pragma: no cover (depends on binding)
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last_err = e
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try:
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self._nbd.connect_socket(sock.fileno())
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return
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except Exception as e2: # pragma: no cover
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last_err = e2
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if hasattr(self._nbd, "connect_fd"):
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try:
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self._nbd.connect_fd(sock.fileno())
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return
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except Exception as e: # pragma: no cover
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last_err = e
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raise RuntimeError(
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"Unable to connect libnbd using existing socket/fd; "
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f"binding missing connect_socket/connect_fd or call failed: {last_err!r}"
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)
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def size(self) -> int:
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return int(self._nbd.get_size())
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def get_capabilities(self) -> Dict[str, bool]:
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"""
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Query NBD export capabilities (read_only, can_flush, can_zero) from the
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server handshake. Returns dict with keys read_only, can_flush, can_zero.
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Uses getattr for binding name variations (is_read_only/get_read_only, etc.).
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"""
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out: Dict[str, bool] = {
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"read_only": True,
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"can_flush": False,
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"can_zero": False,
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}
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for name, keys in [
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("read_only", ("is_read_only", "get_read_only")),
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("can_flush", ("can_flush", "get_can_flush")),
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("can_zero", ("can_zero", "get_can_zero")),
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]:
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for attr in keys:
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if hasattr(self._nbd, attr):
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try:
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val = getattr(self._nbd, attr)()
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out[name] = bool(val)
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except Exception:
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pass
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break
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return out
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def pread(self, length: int, offset: int) -> bytes:
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# Expected signature: pread(length, offset)
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try:
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return self._nbd.pread(length, offset)
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except TypeError: # pragma: no cover (binding differences)
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return self._nbd.pread(offset, length)
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def pwrite(self, buf: bytes, offset: int) -> None:
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# Expected signature: pwrite(buf, offset)
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try:
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self._nbd.pwrite(buf, offset)
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except TypeError: # pragma: no cover (binding differences)
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self._nbd.pwrite(offset, buf)
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def pzero(self, offset: int, size: int) -> None:
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"""
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Zero a byte range. Uses NBD WRITE_ZEROES when available (efficient/punch hole),
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otherwise falls back to writing zero bytes via pwrite.
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"""
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if size <= 0:
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return
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# Try libnbd pwrite_zeros / zero; argument order varies by binding.
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for name in ("pwrite_zeros", "zero"):
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if not hasattr(self._nbd, name):
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continue
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fn = getattr(self._nbd, name)
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try:
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fn(size, offset)
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return
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except TypeError:
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try:
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fn(offset, size)
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return
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except TypeError:
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pass
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# Fallback: write zeros in chunks.
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remaining = size
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pos = offset
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zero_buf = b"\x00" * min(CHUNK_SIZE, size)
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while remaining > 0:
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chunk = min(len(zero_buf), remaining)
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self.pwrite(zero_buf[:chunk], pos)
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pos += chunk
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remaining -= chunk
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def flush(self) -> None:
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if hasattr(self._nbd, "flush"):
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self._nbd.flush()
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return
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if hasattr(self._nbd, "fsync"):
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self._nbd.fsync()
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return
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raise RuntimeError("libnbd binding has no flush/fsync method")
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|
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def get_allocation_extents(self) -> List[Dict[str, Any]]:
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"""
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Query base:allocation and return all extents (allocated and hole/zero)
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as [{"start": ..., "length": ..., "zero": bool}, ...].
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Fallback when block status unavailable: one extent with zero=False.
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"""
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size = self.size()
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if size == 0:
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return []
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if not hasattr(self._nbd, "block_status") and not hasattr(
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self._nbd, "block_status_64"
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):
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return [{"start": 0, "length": size, "zero": False}]
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if hasattr(self._nbd, "can_meta_context") and not self._nbd.can_meta_context(
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"base:allocation"
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):
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return [{"start": 0, "length": size, "zero": False}]
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allocation_extents: List[Dict[str, Any]] = []
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chunk = min(size, 64 * 1024 * 1024)
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offset = 0
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def extent_cb(*args: Any, **kwargs: Any) -> int:
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if len(args) < 3:
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return 0
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metacontext, off, entries = args[0], args[1], args[2]
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if metacontext != "base:allocation" or entries is None:
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return 0
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current = off
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try:
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flat = list(entries)
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for i in range(0, len(flat), 2):
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if i + 1 >= len(flat):
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break
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length = int(flat[i])
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flags = int(flat[i + 1])
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zero = (flags & (_NBD_STATE_HOLE | _NBD_STATE_ZERO)) != 0
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allocation_extents.append(
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{"start": current, "length": length, "zero": zero}
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)
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current += length
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except (TypeError, ValueError, IndexError):
|
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pass
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return 0
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|
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block_status_fn = getattr(
|
|
self._nbd, "block_status_64", getattr(self._nbd, "block_status", None)
|
|
)
|
|
if block_status_fn is None:
|
|
return [{"start": 0, "length": size, "zero": False}]
|
|
try:
|
|
while offset < size:
|
|
count = min(chunk, size - offset)
|
|
try:
|
|
block_status_fn(count, offset, extent_cb)
|
|
except TypeError:
|
|
block_status_fn(offset, count, extent_cb)
|
|
offset += count
|
|
except Exception as e:
|
|
logging.warning("get_allocation_extents block_status failed: %r", e)
|
|
return [{"start": 0, "length": size, "zero": False}]
|
|
if not allocation_extents:
|
|
return [{"start": 0, "length": size, "zero": False}]
|
|
return allocation_extents
|
|
|
|
def get_extents_dirty_and_zero(
|
|
self, dirty_bitmap_context: str
|
|
) -> List[Dict[str, Any]]:
|
|
"""
|
|
Query block status for base:allocation and qemu:dirty-bitmap:<context>,
|
|
merge boundaries, and return extents with dirty and zero flags.
|
|
Format: [{"start": ..., "length": ..., "dirty": bool, "zero": bool}, ...].
|
|
"""
|
|
size = self.size()
|
|
if size == 0:
|
|
return []
|
|
if not hasattr(self._nbd, "block_status") and not hasattr(
|
|
self._nbd, "block_status_64"
|
|
):
|
|
return self._fallback_dirty_zero_extents(size)
|
|
if hasattr(self._nbd, "can_meta_context"):
|
|
if not self._nbd.can_meta_context("base:allocation"):
|
|
return self._fallback_dirty_zero_extents(size)
|
|
if not self._nbd.can_meta_context(dirty_bitmap_context):
|
|
logging.warning(
|
|
"dirty bitmap context %r not negotiated", dirty_bitmap_context
|
|
)
|
|
return self._fallback_dirty_zero_extents(size)
|
|
|
|
allocation_extents: List[Tuple[int, int, bool]] = [] # (start, length, zero)
|
|
dirty_extents: List[Tuple[int, int, bool]] = [] # (start, length, dirty)
|
|
chunk = min(size, 64 * 1024 * 1024)
|
|
offset = 0
|
|
|
|
def extent_cb(*args: Any, **kwargs: Any) -> int:
|
|
if len(args) < 3:
|
|
return 0
|
|
metacontext, off, entries = args[0], args[1], args[2]
|
|
if entries is None or not hasattr(entries, "__iter__"):
|
|
return 0
|
|
current = off
|
|
try:
|
|
flat = list(entries)
|
|
for i in range(0, len(flat), 2):
|
|
if i + 1 >= len(flat):
|
|
break
|
|
length = int(flat[i])
|
|
flags = int(flat[i + 1])
|
|
if metacontext == "base:allocation":
|
|
zero = (flags & (_NBD_STATE_HOLE | _NBD_STATE_ZERO)) != 0
|
|
allocation_extents.append((current, length, zero))
|
|
elif metacontext == dirty_bitmap_context:
|
|
dirty = (flags & _NBD_STATE_DIRTY) != 0
|
|
dirty_extents.append((current, length, dirty))
|
|
current += length
|
|
except (TypeError, ValueError, IndexError):
|
|
pass
|
|
return 0
|
|
|
|
block_status_fn = getattr(
|
|
self._nbd, "block_status_64", getattr(self._nbd, "block_status", None)
|
|
)
|
|
if block_status_fn is None:
|
|
return self._fallback_dirty_zero_extents(size)
|
|
try:
|
|
while offset < size:
|
|
count = min(chunk, size - offset)
|
|
try:
|
|
block_status_fn(count, offset, extent_cb)
|
|
except TypeError:
|
|
block_status_fn(offset, count, extent_cb)
|
|
offset += count
|
|
except Exception as e:
|
|
logging.warning("get_extents_dirty_and_zero block_status failed: %r", e)
|
|
return self._fallback_dirty_zero_extents(size)
|
|
return _merge_dirty_zero_extents(allocation_extents, dirty_extents, size)
|
|
|
|
def _fallback_dirty_zero_extents(self, size: int) -> List[Dict[str, Any]]:
|
|
"""One extent: whole image, dirty=false, zero=false when bitmap unavailable."""
|
|
return [{"start": 0, "length": size, "dirty": False, "zero": False}]
|
|
|
|
def close(self) -> None:
|
|
# Best-effort; bindings may differ.
|
|
try:
|
|
if hasattr(self._nbd, "shutdown"):
|
|
self._nbd.shutdown()
|
|
except Exception:
|
|
pass
|
|
try:
|
|
if hasattr(self._nbd, "close"):
|
|
self._nbd.close()
|
|
except Exception:
|
|
pass
|
|
try:
|
|
self._sock.close()
|
|
except Exception:
|
|
pass
|
|
|
|
def __enter__(self) -> "_NbdConn":
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc, tb) -> None:
|
|
self.close()
|
|
|
|
|
|
class Handler(BaseHTTPRequestHandler):
|
|
server_version = "imageio-poc/0.1"
|
|
server_protocol = "HTTP/1.1"
|
|
|
|
# Keep BaseHTTPRequestHandler from printing noisy default logs
|
|
def log_message(self, fmt: str, *args: Any) -> None:
|
|
logging.info("%s - - %s", self.address_string(), fmt % args)
|
|
|
|
def _send_imageio_headers(
|
|
self, allowed_methods: Optional[str] = None
|
|
) -> None:
|
|
# Include these headers for compatibility with the imageio contract.
|
|
if allowed_methods is None:
|
|
allowed_methods = "GET, PUT, OPTIONS"
|
|
self.send_header("Access-Control-Allow-Methods", allowed_methods)
|
|
self.send_header("Accept-Ranges", "bytes")
|
|
|
|
def _send_json(
|
|
self,
|
|
status: int,
|
|
obj: Any,
|
|
allowed_methods: Optional[str] = None,
|
|
) -> None:
|
|
body = _json_bytes(obj)
|
|
self.send_response(status)
|
|
self._send_imageio_headers(allowed_methods)
|
|
self.send_header("Content-Type", "application/json")
|
|
self.send_header("Content-Length", str(len(body)))
|
|
self.end_headers()
|
|
try:
|
|
self.wfile.write(body)
|
|
except BrokenPipeError:
|
|
pass
|
|
|
|
def _send_error_json(self, status: int, message: str) -> None:
|
|
self._send_json(status, {"error": message})
|
|
|
|
def _send_range_not_satisfiable(self, size: int) -> None:
|
|
# RFC 7233: reply with Content-Range: bytes */<size>
|
|
self.send_response(HTTPStatus.REQUESTED_RANGE_NOT_SATISFIABLE)
|
|
self._send_imageio_headers()
|
|
self.send_header("Content-Type", "application/json")
|
|
self.send_header("Content-Range", f"bytes */{size}")
|
|
body = _json_bytes({"error": "range not satisfiable"})
|
|
self.send_header("Content-Length", str(len(body)))
|
|
self.end_headers()
|
|
try:
|
|
self.wfile.write(body)
|
|
except BrokenPipeError:
|
|
pass
|
|
|
|
def _parse_single_range(self, range_header: str, size: int) -> Tuple[int, int]:
|
|
"""
|
|
Parse a single HTTP byte range (RFC 7233) and return (start, end_inclusive).
|
|
|
|
Supported:
|
|
- Range: bytes=START-END
|
|
- Range: bytes=START-
|
|
- Range: bytes=-SUFFIX
|
|
|
|
Raises ValueError for invalid headers. Caller handles 416 vs 400.
|
|
"""
|
|
if size < 0:
|
|
raise ValueError("invalid size")
|
|
if not range_header:
|
|
raise ValueError("empty Range")
|
|
if "," in range_header:
|
|
raise ValueError("multiple ranges not supported")
|
|
|
|
prefix = "bytes="
|
|
if not range_header.startswith(prefix):
|
|
raise ValueError("only bytes ranges supported")
|
|
spec = range_header[len(prefix) :].strip()
|
|
if "-" not in spec:
|
|
raise ValueError("invalid bytes range")
|
|
|
|
left, right = spec.split("-", 1)
|
|
left = left.strip()
|
|
right = right.strip()
|
|
|
|
if left == "":
|
|
# Suffix range: last N bytes.
|
|
if right == "":
|
|
raise ValueError("invalid suffix range")
|
|
try:
|
|
suffix_len = int(right, 10)
|
|
except ValueError as e:
|
|
raise ValueError("invalid suffix length") from e
|
|
if suffix_len <= 0:
|
|
raise ValueError("invalid suffix length")
|
|
if size == 0:
|
|
# Nothing to serve
|
|
raise ValueError("unsatisfiable")
|
|
if suffix_len >= size:
|
|
return 0, size - 1
|
|
return size - suffix_len, size - 1
|
|
|
|
# START is present
|
|
try:
|
|
start = int(left, 10)
|
|
except ValueError as e:
|
|
raise ValueError("invalid range start") from e
|
|
if start < 0:
|
|
raise ValueError("invalid range start")
|
|
if start >= size:
|
|
raise ValueError("unsatisfiable")
|
|
|
|
if right == "":
|
|
# START-
|
|
return start, size - 1
|
|
|
|
try:
|
|
end = int(right, 10)
|
|
except ValueError as e:
|
|
raise ValueError("invalid range end") from e
|
|
if end < start:
|
|
raise ValueError("unsatisfiable")
|
|
if end >= size:
|
|
end = size - 1
|
|
return start, end
|
|
|
|
def _parse_route(self) -> Tuple[Optional[str], Optional[str]]:
|
|
# Returns (image_id, tail) where tail is:
|
|
# None => /images/{id}
|
|
# "extents" => /images/{id}/extents
|
|
# "flush" => /images/{id}/flush
|
|
path = self.path.split("?", 1)[0]
|
|
parts = [p for p in path.split("/") if p]
|
|
if len(parts) < 2 or parts[0] != "images":
|
|
return None, None
|
|
image_id = parts[1]
|
|
tail = parts[2] if len(parts) >= 3 else None
|
|
if len(parts) > 3:
|
|
return None, None
|
|
return image_id, tail
|
|
|
|
def _parse_query(self) -> Dict[str, List[str]]:
|
|
"""Parse query string from self.path into a dict of name -> list of values."""
|
|
if "?" not in self.path:
|
|
return {}
|
|
query = self.path.split("?", 1)[1]
|
|
return parse_qs(query, keep_blank_values=True)
|
|
|
|
def _image_cfg(self, image_id: str) -> Optional[Dict[str, Any]]:
|
|
return _load_image_cfg(image_id)
|
|
|
|
def _is_file_backend(self, cfg: Dict[str, Any]) -> bool:
|
|
return cfg.get("backend") == "file"
|
|
|
|
def do_OPTIONS(self) -> None:
|
|
image_id, tail = self._parse_route()
|
|
if image_id is None or tail is not None:
|
|
self._send_error_json(HTTPStatus.NOT_FOUND, "not found")
|
|
return
|
|
cfg = self._image_cfg(image_id)
|
|
if cfg is None:
|
|
self._send_error_json(HTTPStatus.NOT_FOUND, "unknown image_id")
|
|
return
|
|
if self._is_file_backend(cfg):
|
|
# File backend: full PUT only, no range writes; GET with ranges allowed; flush supported.
|
|
allowed_methods = "GET, PUT, POST, OPTIONS"
|
|
features = ["flush"]
|
|
max_writers = MAX_PARALLEL_WRITES
|
|
response = {
|
|
"unix_socket": None,
|
|
"features": features,
|
|
"max_readers": MAX_PARALLEL_READS,
|
|
"max_writers": max_writers,
|
|
}
|
|
self._send_json(HTTPStatus.OK, response, allowed_methods=allowed_methods)
|
|
return
|
|
# Query NBD backend for capabilities (like nbdinfo); fall back to config.
|
|
read_only = True
|
|
can_flush = False
|
|
can_zero = False
|
|
try:
|
|
with _NbdConn(
|
|
cfg["socket"],
|
|
cfg.get("export"),
|
|
) as conn:
|
|
caps = conn.get_capabilities()
|
|
read_only = caps["read_only"]
|
|
can_flush = caps["can_flush"]
|
|
can_zero = caps["can_zero"]
|
|
except Exception as e:
|
|
logging.warning("OPTIONS: could not query NBD capabilities: %r", e)
|
|
read_only = bool(cfg.get("read_only"))
|
|
if not read_only:
|
|
can_flush = True
|
|
can_zero = True
|
|
# Report options for this image from NBD: read-only => no PUT; only advertise supported features.
|
|
if read_only:
|
|
allowed_methods = "GET, OPTIONS"
|
|
features = ["extents"]
|
|
max_writers = 0
|
|
else:
|
|
# PATCH: JSON (zero/flush) and Range+binary (write byte range).
|
|
allowed_methods = "GET, PUT, PATCH, OPTIONS"
|
|
features = ["extents"]
|
|
if can_zero:
|
|
features.append("zero")
|
|
if can_flush:
|
|
features.append("flush")
|
|
max_writers = MAX_PARALLEL_WRITES if not read_only else 0
|
|
response = {
|
|
"unix_socket": None, # Not used in this implementation
|
|
"features": features,
|
|
"max_readers": MAX_PARALLEL_READS,
|
|
"max_writers": max_writers,
|
|
}
|
|
self._send_json(HTTPStatus.OK, response, allowed_methods=allowed_methods)
|
|
|
|
def do_GET(self) -> None:
|
|
image_id, tail = self._parse_route()
|
|
if image_id is None:
|
|
self._send_error_json(HTTPStatus.NOT_FOUND, "not found")
|
|
return
|
|
|
|
cfg = self._image_cfg(image_id)
|
|
if cfg is None:
|
|
self._send_error_json(HTTPStatus.NOT_FOUND, "unknown image_id")
|
|
return
|
|
|
|
if tail == "extents":
|
|
if self._is_file_backend(cfg):
|
|
self._send_error_json(
|
|
HTTPStatus.BAD_REQUEST, "extents not supported for file backend"
|
|
)
|
|
return
|
|
query = self._parse_query()
|
|
context = (query.get("context") or [None])[0]
|
|
self._handle_get_extents(image_id, cfg, context=context)
|
|
return
|
|
if tail is not None:
|
|
self._send_error_json(HTTPStatus.NOT_FOUND, "not found")
|
|
return
|
|
|
|
range_header = self.headers.get("Range")
|
|
self._handle_get_image(image_id, cfg, range_header)
|
|
|
|
def do_PUT(self) -> None:
|
|
image_id, tail = self._parse_route()
|
|
if image_id is None or tail is not None:
|
|
self._send_error_json(HTTPStatus.NOT_FOUND, "not found")
|
|
return
|
|
|
|
cfg = self._image_cfg(image_id)
|
|
if cfg is None:
|
|
self._send_error_json(HTTPStatus.NOT_FOUND, "unknown image_id")
|
|
return
|
|
|
|
if self.headers.get("Range") is not None or self.headers.get("Content-Range") is not None:
|
|
self._send_error_json(
|
|
HTTPStatus.BAD_REQUEST, "Range/Content-Range not supported; full writes only"
|
|
)
|
|
return
|
|
|
|
content_length_hdr = self.headers.get("Content-Length")
|
|
if content_length_hdr is None:
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "Content-Length required")
|
|
return
|
|
try:
|
|
content_length = int(content_length_hdr)
|
|
except ValueError:
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "Invalid Content-Length")
|
|
return
|
|
if content_length < 0:
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "Invalid Content-Length")
|
|
return
|
|
|
|
self._handle_put_image(image_id, cfg, content_length)
|
|
|
|
def do_POST(self) -> None:
|
|
image_id, tail = self._parse_route()
|
|
if image_id is None:
|
|
self._send_error_json(HTTPStatus.NOT_FOUND, "not found")
|
|
return
|
|
|
|
cfg = self._image_cfg(image_id)
|
|
if cfg is None:
|
|
self._send_error_json(HTTPStatus.NOT_FOUND, "unknown image_id")
|
|
return
|
|
|
|
if tail == "flush":
|
|
self._handle_post_flush(image_id, cfg)
|
|
return
|
|
self._send_error_json(HTTPStatus.NOT_FOUND, "not found")
|
|
|
|
def do_PATCH(self) -> None:
|
|
image_id, tail = self._parse_route()
|
|
if image_id is None or tail is not None:
|
|
self._send_error_json(HTTPStatus.NOT_FOUND, "not found")
|
|
return
|
|
|
|
cfg = self._image_cfg(image_id)
|
|
if cfg is None:
|
|
self._send_error_json(HTTPStatus.NOT_FOUND, "unknown image_id")
|
|
return
|
|
if self._is_file_backend(cfg):
|
|
self._send_error_json(
|
|
HTTPStatus.BAD_REQUEST,
|
|
"range writes and PATCH not supported for file backend; use PUT for full upload",
|
|
)
|
|
return
|
|
|
|
content_type = self.headers.get("Content-Type", "").split(";")[0].strip().lower()
|
|
range_header = self.headers.get("Range")
|
|
|
|
# Binary PATCH: Range + body writes bytes at that range (e.g. curl -X PATCH -H "Range: bytes=0-1048576" --data-binary @chunk.bin).
|
|
if range_header is not None and content_type != "application/json":
|
|
content_length_hdr = self.headers.get("Content-Length")
|
|
if content_length_hdr is None:
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "Content-Length required")
|
|
return
|
|
try:
|
|
content_length = int(content_length_hdr)
|
|
except ValueError:
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "Invalid Content-Length")
|
|
return
|
|
if content_length <= 0:
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "Content-Length must be positive")
|
|
return
|
|
self._handle_patch_range(image_id, cfg, range_header, content_length)
|
|
return
|
|
|
|
# JSON PATCH: application/json with op (zero, flush).
|
|
if content_type != "application/json":
|
|
self._send_error_json(
|
|
HTTPStatus.UNSUPPORTED_MEDIA_TYPE,
|
|
"PATCH requires Content-Type: application/json (for zero/flush) or Range with binary body",
|
|
)
|
|
return
|
|
|
|
content_length_hdr = self.headers.get("Content-Length")
|
|
if content_length_hdr is None:
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "Content-Length required")
|
|
return
|
|
try:
|
|
content_length = int(content_length_hdr)
|
|
except ValueError:
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "Invalid Content-Length")
|
|
return
|
|
if content_length <= 0 or content_length > 64 * 1024:
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "Invalid Content-Length")
|
|
return
|
|
|
|
body = self.rfile.read(content_length)
|
|
if len(body) != content_length:
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "request body truncated")
|
|
return
|
|
|
|
try:
|
|
payload = json.loads(body.decode("utf-8"))
|
|
except (json.JSONDecodeError, UnicodeDecodeError) as e:
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, f"invalid JSON: {e}")
|
|
return
|
|
|
|
if not isinstance(payload, dict):
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "body must be a JSON object")
|
|
return
|
|
|
|
op = payload.get("op")
|
|
if op == "flush":
|
|
# Flush entire image; offset and size are ignored (per spec).
|
|
self._handle_post_flush(image_id, cfg)
|
|
return
|
|
if op != "zero":
|
|
self._send_error_json(
|
|
HTTPStatus.BAD_REQUEST,
|
|
"unsupported op; only \"zero\" and \"flush\" are supported",
|
|
)
|
|
return
|
|
|
|
try:
|
|
size = int(payload.get("size"))
|
|
except (TypeError, ValueError):
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "missing or invalid \"size\"")
|
|
return
|
|
if size <= 0:
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "\"size\" must be positive")
|
|
return
|
|
|
|
offset = payload.get("offset")
|
|
if offset is None:
|
|
offset = 0
|
|
else:
|
|
try:
|
|
offset = int(offset)
|
|
except (TypeError, ValueError):
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "invalid \"offset\"")
|
|
return
|
|
if offset < 0:
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "\"offset\" must be non-negative")
|
|
return
|
|
|
|
flush = bool(payload.get("flush", False))
|
|
|
|
self._handle_patch_zero(image_id, cfg, offset=offset, size=size, flush=flush)
|
|
|
|
def _handle_get_image(
|
|
self, image_id: str, cfg: Dict[str, Any], range_header: Optional[str]
|
|
) -> None:
|
|
if not _READ_SEM.acquire(blocking=False):
|
|
self._send_error_json(HTTPStatus.SERVICE_UNAVAILABLE, "too many parallel reads")
|
|
return
|
|
|
|
start = _now_s()
|
|
bytes_sent = 0
|
|
try:
|
|
logging.info("GET start image_id=%s range=%s", image_id, range_header or "-")
|
|
if self._is_file_backend(cfg):
|
|
file_path = cfg["file"]
|
|
try:
|
|
size = os.path.getsize(file_path)
|
|
except OSError as e:
|
|
logging.error("GET file size error image_id=%s path=%s err=%r", image_id, file_path, e)
|
|
self._send_error_json(HTTPStatus.INTERNAL_SERVER_ERROR, "failed to access file")
|
|
return
|
|
start_off = 0
|
|
end_off_incl = size - 1 if size > 0 else -1
|
|
status = HTTPStatus.OK
|
|
content_length = size
|
|
if range_header is not None:
|
|
try:
|
|
start_off, end_off_incl = self._parse_single_range(range_header, size)
|
|
except ValueError as e:
|
|
if str(e) == "unsatisfiable":
|
|
self._send_range_not_satisfiable(size)
|
|
return
|
|
if "unsatisfiable" in str(e):
|
|
self._send_range_not_satisfiable(size)
|
|
return
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "invalid Range header")
|
|
return
|
|
status = HTTPStatus.PARTIAL_CONTENT
|
|
content_length = (end_off_incl - start_off) + 1
|
|
|
|
self.send_response(status)
|
|
self._send_imageio_headers()
|
|
self.send_header("Content-Type", "application/octet-stream")
|
|
self.send_header("Content-Length", str(content_length))
|
|
if status == HTTPStatus.PARTIAL_CONTENT:
|
|
self.send_header("Content-Range", f"bytes {start_off}-{end_off_incl}/{size}")
|
|
self.end_headers()
|
|
|
|
offset = start_off
|
|
end_excl = end_off_incl + 1
|
|
with open(file_path, "rb") as f:
|
|
f.seek(offset)
|
|
while offset < end_excl:
|
|
to_read = min(CHUNK_SIZE, end_excl - offset)
|
|
data = f.read(to_read)
|
|
if not data:
|
|
break
|
|
try:
|
|
self.wfile.write(data)
|
|
except BrokenPipeError:
|
|
logging.info("GET client disconnected image_id=%s at=%d", image_id, offset)
|
|
break
|
|
offset += len(data)
|
|
bytes_sent += len(data)
|
|
else:
|
|
with _NbdConn(cfg["socket"], cfg.get("export")) as conn:
|
|
size = conn.size()
|
|
|
|
start_off = 0
|
|
end_off_incl = size - 1 if size > 0 else -1
|
|
status = HTTPStatus.OK
|
|
content_length = size
|
|
if range_header is not None:
|
|
try:
|
|
start_off, end_off_incl = self._parse_single_range(range_header, size)
|
|
except ValueError as e:
|
|
if str(e) == "unsatisfiable":
|
|
self._send_range_not_satisfiable(size)
|
|
return
|
|
if "unsatisfiable" in str(e):
|
|
self._send_range_not_satisfiable(size)
|
|
return
|
|
self._send_error_json(HTTPStatus.BAD_REQUEST, "invalid Range header")
|
|
return
|
|
status = HTTPStatus.PARTIAL_CONTENT
|
|
content_length = (end_off_incl - start_off) + 1
|
|
|
|
self.send_response(status)
|
|
self._send_imageio_headers()
|
|
self.send_header("Content-Type", "application/octet-stream")
|
|
self.send_header("Content-Length", str(content_length))
|
|
if status == HTTPStatus.PARTIAL_CONTENT:
|
|
self.send_header("Content-Range", f"bytes {start_off}-{end_off_incl}/{size}")
|
|
self.end_headers()
|
|
|
|
offset = start_off
|
|
end_excl = end_off_incl + 1
|
|
while offset < end_excl:
|
|
to_read = min(CHUNK_SIZE, end_excl - offset)
|
|
data = conn.pread(to_read, offset)
|
|
if not data:
|
|
raise RuntimeError("backend returned empty read")
|
|
try:
|
|
self.wfile.write(data)
|
|
except BrokenPipeError:
|
|
logging.info("GET client disconnected image_id=%s at=%d", image_id, offset)
|
|
break
|
|
offset += len(data)
|
|
bytes_sent += len(data)
|
|
except Exception as e:
|
|
# If headers already sent, we can't return JSON reliably; just log.
|
|
logging.error("GET error image_id=%s err=%r", image_id, e)
|
|
try:
|
|
if not self.wfile.closed:
|
|
self.close_connection = True
|
|
except Exception:
|
|
pass
|
|
finally:
|
|
_READ_SEM.release()
|
|
dur = _now_s() - start
|
|
logging.info(
|
|
"GET end image_id=%s bytes=%d duration_s=%.3f", image_id, bytes_sent, dur
|
|
)
|
|
|
|
def _handle_put_image(self, image_id: str, cfg: Dict[str, Any], content_length: int) -> None:
|
|
lock = _get_image_lock(image_id)
|
|
if not lock.acquire(blocking=False):
|
|
self._send_error_json(HTTPStatus.CONFLICT, "image busy")
|
|
return
|
|
|
|
if not _WRITE_SEM.acquire(blocking=False):
|
|
lock.release()
|
|
self._send_error_json(HTTPStatus.SERVICE_UNAVAILABLE, "too many parallel writes")
|
|
return
|
|
|
|
start = _now_s()
|
|
bytes_written = 0
|
|
try:
|
|
logging.info("PUT start image_id=%s content_length=%d", image_id, content_length)
|
|
if self._is_file_backend(cfg):
|
|
file_path = cfg["file"]
|
|
remaining = content_length
|
|
with open(file_path, "wb") as f:
|
|
while remaining > 0:
|
|
chunk = self.rfile.read(min(CHUNK_SIZE, remaining))
|
|
if not chunk:
|
|
self._send_error_json(
|
|
HTTPStatus.BAD_REQUEST,
|
|
f"request body ended early at {bytes_written} bytes",
|
|
)
|
|
return
|
|
f.write(chunk)
|
|
bytes_written += len(chunk)
|
|
remaining -= len(chunk)
|
|
self._send_json(HTTPStatus.OK, {"ok": True, "bytes_written": bytes_written})
|
|
else:
|
|
with _NbdConn(cfg["socket"], cfg.get("export")) as conn:
|
|
offset = 0
|
|
remaining = content_length
|
|
while remaining > 0:
|
|
chunk = self.rfile.read(min(CHUNK_SIZE, remaining))
|
|
if not chunk:
|
|
self._send_error_json(
|
|
HTTPStatus.BAD_REQUEST,
|
|
f"request body ended early at {offset} bytes",
|
|
)
|
|
return
|
|
conn.pwrite(chunk, offset)
|
|
offset += len(chunk)
|
|
remaining -= len(chunk)
|
|
bytes_written += len(chunk)
|
|
|
|
# POC-level: do not auto-flush on PUT; expose explicit /flush endpoint.
|
|
self._send_json(HTTPStatus.OK, {"ok": True, "bytes_written": bytes_written})
|
|
except Exception as e:
|
|
logging.error("PUT error image_id=%s err=%r", image_id, e)
|
|
self._send_error_json(HTTPStatus.INTERNAL_SERVER_ERROR, "backend error")
|
|
finally:
|
|
_WRITE_SEM.release()
|
|
lock.release()
|
|
dur = _now_s() - start
|
|
logging.info(
|
|
"PUT end image_id=%s bytes=%d duration_s=%.3f", image_id, bytes_written, dur
|
|
)
|
|
|
|
def _handle_get_extents(
|
|
self, image_id: str, cfg: Dict[str, Any], context: Optional[str] = None
|
|
) -> None:
|
|
# context=dirty: return extents with dirty and zero from base:allocation + bitmap.
|
|
# Otherwise: return zero/hole extents from base:allocation only.
|
|
lock = _get_image_lock(image_id)
|
|
if not lock.acquire(blocking=False):
|
|
self._send_error_json(HTTPStatus.CONFLICT, "image busy")
|
|
return
|
|
|
|
start = _now_s()
|
|
try:
|
|
logging.info("EXTENTS start image_id=%s context=%s", image_id, context)
|
|
if context == "dirty":
|
|
export_bitmap = cfg.get("export_bitmap")
|
|
if not export_bitmap:
|
|
# Fallback: same structure as zero extents but dirty=true for all ranges
|
|
with _NbdConn(
|
|
cfg["socket"],
|
|
cfg.get("export"),
|
|
need_block_status=True,
|
|
) as conn:
|
|
allocation = conn.get_allocation_extents()
|
|
extents = [
|
|
{"start": e["start"], "length": e["length"], "dirty": True, "zero": e["zero"]}
|
|
for e in allocation
|
|
]
|
|
else:
|
|
dirty_bitmap_ctx = f"qemu:dirty-bitmap:{export_bitmap}"
|
|
extra_contexts: List[str] = [dirty_bitmap_ctx]
|
|
with _NbdConn(
|
|
cfg["socket"],
|
|
cfg.get("export"),
|
|
need_block_status=True,
|
|
extra_meta_contexts=extra_contexts,
|
|
) as conn:
|
|
extents = conn.get_extents_dirty_and_zero(dirty_bitmap_ctx)
|
|
# When bitmap not actually available, same fallback: zero structure + dirty=true
|
|
if _is_fallback_dirty_response(extents):
|
|
with _NbdConn(
|
|
cfg["socket"],
|
|
cfg.get("export"),
|
|
need_block_status=True,
|
|
) as conn:
|
|
allocation = conn.get_allocation_extents()
|
|
extents = [
|
|
{
|
|
"start": e["start"],
|
|
"length": e["length"],
|
|
"dirty": True,
|
|
"zero": e["zero"],
|
|
}
|
|
for e in allocation
|
|
]
|
|
else:
|
|
with _NbdConn(
|
|
cfg["socket"],
|
|
cfg.get("export"),
|
|
need_block_status=True,
|
|
) as conn:
|
|
extents = conn.get_allocation_extents()
|
|
self._send_json(HTTPStatus.OK, extents)
|
|
except Exception as e:
|
|
logging.error("EXTENTS error image_id=%s err=%r", image_id, e)
|
|
self._send_error_json(HTTPStatus.INTERNAL_SERVER_ERROR, "backend error")
|
|
finally:
|
|
lock.release()
|
|
dur = _now_s() - start
|
|
logging.info("EXTENTS end image_id=%s duration_s=%.3f", image_id, dur)
|
|
|
|
def _handle_post_flush(self, image_id: str, cfg: Dict[str, Any]) -> None:
|
|
lock = _get_image_lock(image_id)
|
|
if not lock.acquire(blocking=False):
|
|
self._send_error_json(HTTPStatus.CONFLICT, "image busy")
|
|
return
|
|
|
|
start = _now_s()
|
|
try:
|
|
logging.info("FLUSH start image_id=%s", image_id)
|
|
if self._is_file_backend(cfg):
|
|
file_path = cfg["file"]
|
|
with open(file_path, "rb") as f:
|
|
f.flush()
|
|
os.fsync(f.fileno())
|
|
self._send_json(HTTPStatus.OK, {"ok": True})
|
|
else:
|
|
with _NbdConn(cfg["socket"], cfg.get("export")) as conn:
|
|
conn.flush()
|
|
self._send_json(HTTPStatus.OK, {"ok": True})
|
|
except Exception as e:
|
|
logging.error("FLUSH error image_id=%s err=%r", image_id, e)
|
|
self._send_error_json(HTTPStatus.INTERNAL_SERVER_ERROR, "backend error")
|
|
finally:
|
|
lock.release()
|
|
dur = _now_s() - start
|
|
logging.info("FLUSH end image_id=%s duration_s=%.3f", image_id, dur)
|
|
|
|
def _handle_patch_zero(
|
|
self,
|
|
image_id: str,
|
|
cfg: Dict[str, Any],
|
|
offset: int,
|
|
size: int,
|
|
flush: bool,
|
|
) -> None:
|
|
lock = _get_image_lock(image_id)
|
|
if not lock.acquire(blocking=False):
|
|
self._send_error_json(HTTPStatus.CONFLICT, "image busy")
|
|
return
|
|
|
|
if not _WRITE_SEM.acquire(blocking=False):
|
|
lock.release()
|
|
self._send_error_json(HTTPStatus.SERVICE_UNAVAILABLE, "too many parallel writes")
|
|
return
|
|
|
|
start = _now_s()
|
|
try:
|
|
logging.info(
|
|
"PATCH zero start image_id=%s offset=%d size=%d flush=%s",
|
|
image_id, offset, size, flush,
|
|
)
|
|
with _NbdConn(cfg["socket"], cfg.get("export")) as conn:
|
|
image_size = conn.size()
|
|
if offset >= image_size:
|
|
self._send_error_json(
|
|
HTTPStatus.BAD_REQUEST,
|
|
"offset must be less than image size",
|
|
)
|
|
return
|
|
zero_size = min(size, image_size - offset)
|
|
conn.pzero(offset, zero_size)
|
|
if flush:
|
|
conn.flush()
|
|
self._send_json(HTTPStatus.OK, {"ok": True})
|
|
except Exception as e:
|
|
logging.error("PATCH zero error image_id=%s err=%r", image_id, e)
|
|
self._send_error_json(HTTPStatus.INTERNAL_SERVER_ERROR, "backend error")
|
|
finally:
|
|
_WRITE_SEM.release()
|
|
lock.release()
|
|
dur = _now_s() - start
|
|
logging.info("PATCH zero end image_id=%s duration_s=%.3f", image_id, dur)
|
|
|
|
def _handle_patch_range(
|
|
self,
|
|
image_id: str,
|
|
cfg: Dict[str, Any],
|
|
range_header: str,
|
|
content_length: int,
|
|
) -> None:
|
|
"""Write request body to the image at the byte range from Range header."""
|
|
lock = _get_image_lock(image_id)
|
|
if not lock.acquire(blocking=False):
|
|
self._send_error_json(HTTPStatus.CONFLICT, "image busy")
|
|
return
|
|
|
|
if not _WRITE_SEM.acquire(blocking=False):
|
|
lock.release()
|
|
self._send_error_json(HTTPStatus.SERVICE_UNAVAILABLE, "too many parallel writes")
|
|
return
|
|
|
|
start = _now_s()
|
|
bytes_written = 0
|
|
try:
|
|
logging.info(
|
|
"PATCH range start image_id=%s range=%s content_length=%d",
|
|
image_id, range_header, content_length,
|
|
)
|
|
with _NbdConn(cfg["socket"], cfg.get("export")) as conn:
|
|
image_size = conn.size()
|
|
try:
|
|
start_off, end_inclusive = self._parse_single_range(
|
|
range_header, image_size
|
|
)
|
|
except ValueError as e:
|
|
if "unsatisfiable" in str(e).lower():
|
|
self._send_range_not_satisfiable(image_size)
|
|
else:
|
|
self._send_error_json(
|
|
HTTPStatus.BAD_REQUEST, f"invalid Range header: {e}"
|
|
)
|
|
return
|
|
expected_len = end_inclusive - start_off + 1
|
|
if content_length != expected_len:
|
|
self._send_error_json(
|
|
HTTPStatus.BAD_REQUEST,
|
|
f"Content-Length ({content_length}) must equal range length ({expected_len})",
|
|
)
|
|
return
|
|
offset = start_off
|
|
remaining = content_length
|
|
while remaining > 0:
|
|
chunk = self.rfile.read(min(CHUNK_SIZE, remaining))
|
|
if not chunk:
|
|
self._send_error_json(
|
|
HTTPStatus.BAD_REQUEST,
|
|
f"request body ended early at {bytes_written} bytes",
|
|
)
|
|
return
|
|
conn.pwrite(chunk, offset)
|
|
n = len(chunk)
|
|
offset += n
|
|
remaining -= n
|
|
bytes_written += n
|
|
self._send_json(HTTPStatus.OK, {"ok": True, "bytes_written": bytes_written})
|
|
except Exception as e:
|
|
logging.error("PATCH range error image_id=%s err=%r", image_id, e)
|
|
self._send_error_json(HTTPStatus.INTERNAL_SERVER_ERROR, "backend error")
|
|
finally:
|
|
_WRITE_SEM.release()
|
|
lock.release()
|
|
dur = _now_s() - start
|
|
logging.info(
|
|
"PATCH range end image_id=%s bytes=%d duration_s=%.3f",
|
|
image_id, bytes_written, dur,
|
|
)
|
|
|
|
|
|
def main() -> None:
|
|
parser = argparse.ArgumentParser(description="POC imageio-like HTTP server backed by NBD")
|
|
parser.add_argument("--listen", default="127.0.0.1", help="Address to bind")
|
|
parser.add_argument("--port", type=int, default=54323, help="Port to listen on")
|
|
args = parser.parse_args()
|
|
|
|
logging.basicConfig(
|
|
level=logging.INFO,
|
|
format="%(asctime)s %(levelname)s %(message)s",
|
|
)
|
|
|
|
addr = (args.listen, args.port)
|
|
httpd = ThreadingHTTPServer(addr, Handler)
|
|
logging.info("listening on http://%s:%d", args.listen, args.port)
|
|
logging.info("image configs are read from %s/<transferId>", _CFG_DIR)
|
|
httpd.serve_forever()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|