Logan Cusano
142 lines
5.2 KiB
Python
142 lines
5.2 KiB
Python
import httpx
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from dataclasses import dataclass, field
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from typing import Optional, Dict, Any, List
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from app.config import settings
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from app.internal.logger import logger
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# The OP25 HTTP terminal answers a single "update" command with a LIST of
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# messages, each tagged with a `json_type`. We care about two of them:
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#
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# channel_update — current receiver state. `channels` holds the channel ids and
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# each id is also a top-level key holding that channel's dict
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# (freq/tgid/tag/srcaddr/svcopts/hold_tgid/…).
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#
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# call_log — an EVENT QUEUE, not a snapshot. `log` holds entries appended
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# by tk_p25.log_call() at channel-grant time, each stamped with
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# OP25's own time.time(). get_call_log() DRAINS the deque, so
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# every entry is delivered exactly once and a missed poll loses
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# it forever. The deque is capped at CALL_LOG_MAX_LEN = 10, so
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# the consumer must keep up.
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#
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# Everything else (trunk_update, rx_update, terminal_config, …) is ignored.
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TERMINAL_UPDATE_COMMAND = [{"command": "update", "arg1": 0, "arg2": 0}]
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@dataclass
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class TerminalUpdate:
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"""One decoded poll of the OP25 HTTP terminal."""
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channels: List[Dict[str, Any]] = field(default_factory=list)
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call_log: List[Dict[str, Any]] = field(default_factory=list)
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class OP25Client:
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def __init__(self):
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self.api_url = settings.op25_api_url
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self.terminal_url = settings.op25_terminal_url
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async def start(self) -> bool:
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try:
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async with httpx.AsyncClient(timeout=10) as client:
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r = await client.post(f"{self.api_url}/op25/start")
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r.raise_for_status()
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return True
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except Exception as e:
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logger.error(f"OP25 start failed: {e}")
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return False
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async def stop(self) -> bool:
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try:
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async with httpx.AsyncClient(timeout=10) as client:
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r = await client.post(f"{self.api_url}/op25/stop")
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r.raise_for_status()
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return True
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except Exception as e:
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logger.error(f"OP25 stop failed: {e}")
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return False
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async def status(self) -> Optional[Dict[str, Any]]:
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try:
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async with httpx.AsyncClient(timeout=5) as client:
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r = await client.get(f"{self.api_url}/op25/status")
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r.raise_for_status()
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return r.json()
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except Exception as e:
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logger.error(f"OP25 status failed: {e}")
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return None
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async def generate_config(self, config: Dict[str, Any]) -> bool:
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try:
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async with httpx.AsyncClient(timeout=10) as client:
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r = await client.post(f"{self.api_url}/op25/generate-config", json=config)
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r.raise_for_status()
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return True
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except Exception as e:
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logger.error(f"OP25 generate-config failed: {e}")
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return False
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async def poll_terminal(self) -> Optional[TerminalUpdate]:
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"""
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Poll the OP25 HTTP terminal once and decode every message we understand.
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Returns None only when OP25 is unreachable / returned garbage — callers
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use that to distinguish "no traffic" from "no OP25".
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"""
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try:
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async with httpx.AsyncClient(timeout=3) as client:
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r = await client.post(self.terminal_url, json=TERMINAL_UPDATE_COMMAND)
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r.raise_for_status()
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return parse_terminal_messages(r.json())
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except Exception:
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return None
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async def get_terminal_status(self) -> Optional[Dict[str, Any]]:
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"""
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Compatibility shim: the first channel's state dict, as this used to return.
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Prefer poll_terminal() — this discards the call_log, which is the only
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source of exact call-start timestamps.
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"""
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update = await self.poll_terminal()
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if not update or not update.channels:
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return None
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return update.channels[0]
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def parse_terminal_messages(messages: Any) -> TerminalUpdate:
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"""
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Decode an OP25 terminal response into channel state + call-log events.
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Deliberately permissive: the response may be a bare dict instead of a list,
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may contain json_type values we have never seen, and individual entries may
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be malformed. Anything unrecognised is skipped rather than raising, because
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dropping a whole poll would drop call_log events that are never re-sent.
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"""
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update = TerminalUpdate()
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if isinstance(messages, dict):
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messages = [messages]
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if not isinstance(messages, list):
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return update
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for msg in messages:
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if not isinstance(msg, dict):
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continue
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json_type = msg.get("json_type")
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if json_type == "channel_update":
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for chan_id in msg.get("channels") or []:
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channel = msg.get(str(chan_id))
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if isinstance(channel, dict):
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update.channels.append(channel)
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elif json_type == "call_log":
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for entry in msg.get("log") or []:
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if isinstance(entry, dict):
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update.call_log.append(entry)
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return update
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op25_client = OP25Client()
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