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| 1 | +#!/usr/bin/env python3 |
| 2 | +# -*- coding: utf-8 -*- |
| 3 | +import dataclasses |
| 4 | +import threading |
| 5 | +import sys |
| 6 | +import signal |
| 7 | +import subprocess |
| 8 | +import json |
| 9 | +import re |
| 10 | +import time |
| 11 | +import logging |
| 12 | + |
| 13 | + |
| 14 | +@dataclasses.dataclass(frozen=True) |
| 15 | +class Forward: |
| 16 | + port: int |
| 17 | + |
| 18 | + def __ne__(self, other): |
| 19 | + return not self.__eq__(other) |
| 20 | + |
| 21 | + @staticmethod |
| 22 | + def parse_list(ports): |
| 23 | + r = [] |
| 24 | + for port in ports.split(","): |
| 25 | + port_splits = port.split("->") |
| 26 | + if len(port_splits) < 2: |
| 27 | + continue |
| 28 | + host, ports = Forward.parse_host(port_splits[0], "localhost") |
| 29 | + for port in ports: |
| 30 | + r.append(Forward(port)) |
| 31 | + return r |
| 32 | + |
| 33 | + @staticmethod |
| 34 | + def parse_host(s, default_host): |
| 35 | + s = re.sub("/.*$", "", s) |
| 36 | + hp = s.split(":") |
| 37 | + if len(hp) == 1: |
| 38 | + return default_host, Forward.parse_ports(hp[0]) |
| 39 | + if len(hp) == 2: |
| 40 | + return hp[0], Forward.parse_ports(hp[1]) |
| 41 | + return None, [] |
| 42 | + |
| 43 | + @staticmethod |
| 44 | + def parse_ports(ports): |
| 45 | + port_range = ports.split("-") |
| 46 | + start = int(port_range[0]) |
| 47 | + end = int(port_range[0]) + 1 |
| 48 | + if len(port_range) > 2 or len(port_range) < 1: |
| 49 | + raise RuntimeError(f"don't know what to do with ports {ports}") |
| 50 | + if len(port_range) == 2: |
| 51 | + end = int(port_range[1]) + 1 |
| 52 | + return list(range(start, end)) |
| 53 | + |
| 54 | + |
| 55 | +class PortForwarder: |
| 56 | + def __init__(self, forward, local_bind_address="127.0.0.1"): |
| 57 | + self.process = subprocess.Popen( |
| 58 | + [ |
| 59 | + "ssh", |
| 60 | + "-N", |
| 61 | + f"-L{local_bind_address}:{forward.port}:localhost:{forward.port}", |
| 62 | + "remote-docker", |
| 63 | + ] |
| 64 | + ) |
| 65 | + |
| 66 | + def stop(self): |
| 67 | + self.process.kill() |
| 68 | + |
| 69 | + |
| 70 | +class DockerForwarder: |
| 71 | + def __init__(self): |
| 72 | + self.running = threading.Event() |
| 73 | + self.running.set() |
| 74 | + |
| 75 | + def start(self): |
| 76 | + forwards = {} |
| 77 | + try: |
| 78 | + while self.running.is_set(): |
| 79 | + new_forwards = self.container_config() |
| 80 | + existing_forwards = list(forwards.keys()) |
| 81 | + for forward in new_forwards: |
| 82 | + if forward in existing_forwards: |
| 83 | + existing_forwards.remove(forward) |
| 84 | + else: |
| 85 | + logging.info(f"adding forward {forward}") |
| 86 | + forwards[forward] = PortForwarder(forward) |
| 87 | + |
| 88 | + for to_clean in existing_forwards: |
| 89 | + logging.info(f"stopping forward {to_clean}") |
| 90 | + forwards[to_clean].stop() |
| 91 | + del forwards[to_clean] |
| 92 | + time.sleep(0.8) |
| 93 | + finally: |
| 94 | + for forward in forwards.values(): |
| 95 | + forward.stop() |
| 96 | + |
| 97 | + @staticmethod |
| 98 | + def container_config(): |
| 99 | + def cmd(cmd_array): |
| 100 | + out = subprocess.Popen( |
| 101 | + cmd_array, |
| 102 | + universal_newlines=True, |
| 103 | + stdout=subprocess.PIPE, |
| 104 | + stderr=subprocess.PIPE, |
| 105 | + ) |
| 106 | + out.wait() |
| 107 | + return out.communicate()[0] |
| 108 | + |
| 109 | + try: |
| 110 | + stdout = cmd(["docker", "ps", "--format", "'{{json .}}'"]) |
| 111 | + stdout = stdout.replace("'", "") |
| 112 | + configs = map(lambda l: json.loads(l), stdout.splitlines()) |
| 113 | + forwards = [] |
| 114 | + for c in configs: |
| 115 | + if c is None or c["Ports"] is None: |
| 116 | + continue |
| 117 | + ports = c["Ports"].strip() |
| 118 | + if ports == "": |
| 119 | + continue |
| 120 | + forwards += Forward.parse_list(ports) |
| 121 | + return forwards |
| 122 | + except RuntimeError: |
| 123 | + logging.error("Unexpected error:", sys.exc_info()[0]) |
| 124 | + return [] |
| 125 | + |
| 126 | + def stop(self): |
| 127 | + logging.info("stopping") |
| 128 | + self.running.clear() |
| 129 | + |
| 130 | + |
| 131 | +def main(): |
| 132 | + logging.basicConfig( |
| 133 | + format='%(asctime)s %(levelname)-8s %(message)s', |
| 134 | + level=logging.INFO, |
| 135 | + datefmt='%Y-%m-%d %H:%M:%S') |
| 136 | + forwarder = DockerForwarder() |
| 137 | + |
| 138 | + def handler(*_): |
| 139 | + forwarder.stop() |
| 140 | + |
| 141 | + signal.signal(signal.SIGINT, handler) |
| 142 | + |
| 143 | + forwarder.start() |
| 144 | + |
| 145 | + |
| 146 | +if __name__ == "__main__": |
| 147 | + main() |
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