File size: 19,736 Bytes
b5b9c2e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 | """OpenAI-compatible shim that forwards Hermes requests to `copilot --acp`.
This adapter lets Hermes treat the GitHub Copilot ACP server as a chat-style
backend. Each request starts a short-lived ACP session, sends the formatted
conversation as a single prompt, collects text chunks, and converts the result
back into the minimal shape Hermes expects from an OpenAI client.
"""
from __future__ import annotations
import json
import os
import queue
import re
import shlex
import subprocess
import threading
import time
from collections import deque
from pathlib import Path
from types import SimpleNamespace
from typing import Any
ACP_MARKER_BASE_URL = "acp://copilot"
_DEFAULT_TIMEOUT_SECONDS = 900.0
_TOOL_CALL_BLOCK_RE = re.compile(r"<tool_call>\s*(\{.*?\})\s*</tool_call>", re.DOTALL)
_TOOL_CALL_JSON_RE = re.compile(r"\{\s*\"id\"\s*:\s*\"[^\"]+\"\s*,\s*\"type\"\s*:\s*\"function\"\s*,\s*\"function\"\s*:\s*\{.*?\}\s*\}", re.DOTALL)
def _resolve_command() -> str:
return (
os.getenv("HERMES_COPILOT_ACP_COMMAND", "").strip()
or os.getenv("COPILOT_CLI_PATH", "").strip()
or "copilot"
)
def _resolve_args() -> list[str]:
raw = os.getenv("HERMES_COPILOT_ACP_ARGS", "").strip()
if not raw:
return ["--acp", "--stdio"]
return shlex.split(raw)
def _jsonrpc_error(message_id: Any, code: int, message: str) -> dict[str, Any]:
return {
"jsonrpc": "2.0",
"id": message_id,
"error": {
"code": code,
"message": message,
},
}
def _format_messages_as_prompt(
messages: list[dict[str, Any]],
model: str | None = None,
tools: list[dict[str, Any]] | None = None,
tool_choice: Any = None,
) -> str:
sections: list[str] = [
"You are being used as the active ACP agent backend for Hermes.",
"Use ACP capabilities to complete tasks.",
"IMPORTANT: If you take an action with a tool, you MUST output tool calls using <tool_call>{...}</tool_call> blocks with JSON exactly in OpenAI function-call shape.",
"If no tool is needed, answer normally.",
]
if model:
sections.append(f"Hermes requested model hint: {model}")
if isinstance(tools, list) and tools:
tool_specs: list[dict[str, Any]] = []
for t in tools:
if not isinstance(t, dict):
continue
fn = t.get("function") or {}
if not isinstance(fn, dict):
continue
name = fn.get("name")
if not isinstance(name, str) or not name.strip():
continue
tool_specs.append(
{
"name": name.strip(),
"description": fn.get("description", ""),
"parameters": fn.get("parameters", {}),
}
)
if tool_specs:
sections.append(
"Available tools (OpenAI function schema). "
"When using a tool, emit ONLY <tool_call>{...}</tool_call> with one JSON object "
"containing id/type/function{name,arguments}. arguments must be a JSON string.\n"
+ json.dumps(tool_specs, ensure_ascii=False)
)
if tool_choice is not None:
sections.append(f"Tool choice hint: {json.dumps(tool_choice, ensure_ascii=False)}")
transcript: list[str] = []
for message in messages:
if not isinstance(message, dict):
continue
role = str(message.get("role") or "unknown").strip().lower()
if role == "tool":
role = "tool"
elif role not in {"system", "user", "assistant"}:
role = "context"
content = message.get("content")
rendered = _render_message_content(content)
if not rendered:
continue
label = {
"system": "System",
"user": "User",
"assistant": "Assistant",
"tool": "Tool",
"context": "Context",
}.get(role, role.title())
transcript.append(f"{label}:\n{rendered}")
if transcript:
sections.append("Conversation transcript:\n\n" + "\n\n".join(transcript))
sections.append("Continue the conversation from the latest user request.")
return "\n\n".join(section.strip() for section in sections if section and section.strip())
def _render_message_content(content: Any) -> str:
if content is None:
return ""
if isinstance(content, str):
return content.strip()
if isinstance(content, dict):
if "text" in content:
return str(content.get("text") or "").strip()
if "content" in content and isinstance(content.get("content"), str):
return str(content.get("content") or "").strip()
return json.dumps(content, ensure_ascii=True)
if isinstance(content, list):
parts: list[str] = []
for item in content:
if isinstance(item, str):
parts.append(item)
elif isinstance(item, dict):
text = item.get("text")
if isinstance(text, str) and text.strip():
parts.append(text.strip())
return "\n".join(parts).strip()
return str(content).strip()
def _extract_tool_calls_from_text(text: str) -> tuple[list[SimpleNamespace], str]:
if not isinstance(text, str) or not text.strip():
return [], ""
extracted: list[SimpleNamespace] = []
consumed_spans: list[tuple[int, int]] = []
def _try_add_tool_call(raw_json: str) -> None:
try:
obj = json.loads(raw_json)
except Exception:
return
if not isinstance(obj, dict):
return
fn = obj.get("function")
if not isinstance(fn, dict):
return
fn_name = fn.get("name")
if not isinstance(fn_name, str) or not fn_name.strip():
return
fn_args = fn.get("arguments", "{}")
if not isinstance(fn_args, str):
fn_args = json.dumps(fn_args, ensure_ascii=False)
call_id = obj.get("id")
if not isinstance(call_id, str) or not call_id.strip():
call_id = f"acp_call_{len(extracted)+1}"
extracted.append(
SimpleNamespace(
id=call_id,
call_id=call_id,
response_item_id=None,
type="function",
function=SimpleNamespace(name=fn_name.strip(), arguments=fn_args),
)
)
for m in _TOOL_CALL_BLOCK_RE.finditer(text):
raw = m.group(1)
_try_add_tool_call(raw)
consumed_spans.append((m.start(), m.end()))
# Only try bare-JSON fallback when no XML blocks were found.
if not extracted:
for m in _TOOL_CALL_JSON_RE.finditer(text):
raw = m.group(0)
_try_add_tool_call(raw)
consumed_spans.append((m.start(), m.end()))
if not consumed_spans:
return extracted, text.strip()
consumed_spans.sort()
merged: list[tuple[int, int]] = []
for start, end in consumed_spans:
if not merged or start > merged[-1][1]:
merged.append((start, end))
else:
merged[-1] = (merged[-1][0], max(merged[-1][1], end))
parts: list[str] = []
cursor = 0
for start, end in merged:
if cursor < start:
parts.append(text[cursor:start])
cursor = max(cursor, end)
if cursor < len(text):
parts.append(text[cursor:])
cleaned = "\n".join(p.strip() for p in parts if p and p.strip()).strip()
return extracted, cleaned
def _ensure_path_within_cwd(path_text: str, cwd: str) -> Path:
candidate = Path(path_text)
if not candidate.is_absolute():
raise PermissionError("ACP file-system paths must be absolute.")
resolved = candidate.resolve()
root = Path(cwd).resolve()
try:
resolved.relative_to(root)
except ValueError as exc:
raise PermissionError(f"Path '{resolved}' is outside the session cwd '{root}'.") from exc
return resolved
class _ACPChatCompletions:
def __init__(self, client: "CopilotACPClient"):
self._client = client
def create(self, **kwargs: Any) -> Any:
return self._client._create_chat_completion(**kwargs)
class _ACPChatNamespace:
def __init__(self, client: "CopilotACPClient"):
self.completions = _ACPChatCompletions(client)
class CopilotACPClient:
"""Minimal OpenAI-client-compatible facade for Copilot ACP."""
def __init__(
self,
*,
api_key: str | None = None,
base_url: str | None = None,
default_headers: dict[str, str] | None = None,
acp_command: str | None = None,
acp_args: list[str] | None = None,
acp_cwd: str | None = None,
command: str | None = None,
args: list[str] | None = None,
**_: Any,
):
self.api_key = api_key or "copilot-acp"
self.base_url = base_url or ACP_MARKER_BASE_URL
self._default_headers = dict(default_headers or {})
self._acp_command = acp_command or command or _resolve_command()
self._acp_args = list(acp_args or args or _resolve_args())
self._acp_cwd = str(Path(acp_cwd or os.getcwd()).resolve())
self.chat = _ACPChatNamespace(self)
self.is_closed = False
self._active_process: subprocess.Popen[str] | None = None
self._active_process_lock = threading.Lock()
def close(self) -> None:
proc: subprocess.Popen[str] | None
with self._active_process_lock:
proc = self._active_process
self._active_process = None
self.is_closed = True
if proc is None:
return
try:
proc.terminate()
proc.wait(timeout=2)
except Exception:
try:
proc.kill()
except Exception:
pass
def _create_chat_completion(
self,
*,
model: str | None = None,
messages: list[dict[str, Any]] | None = None,
timeout: float | None = None,
tools: list[dict[str, Any]] | None = None,
tool_choice: Any = None,
**_: Any,
) -> Any:
prompt_text = _format_messages_as_prompt(
messages or [],
model=model,
tools=tools,
tool_choice=tool_choice,
)
response_text, reasoning_text = self._run_prompt(
prompt_text,
timeout_seconds=float(timeout or _DEFAULT_TIMEOUT_SECONDS),
)
tool_calls, cleaned_text = _extract_tool_calls_from_text(response_text)
usage = SimpleNamespace(
prompt_tokens=0,
completion_tokens=0,
total_tokens=0,
prompt_tokens_details=SimpleNamespace(cached_tokens=0),
)
assistant_message = SimpleNamespace(
content=cleaned_text,
tool_calls=tool_calls,
reasoning=reasoning_text or None,
reasoning_content=reasoning_text or None,
reasoning_details=None,
)
finish_reason = "tool_calls" if tool_calls else "stop"
choice = SimpleNamespace(message=assistant_message, finish_reason=finish_reason)
return SimpleNamespace(
choices=[choice],
usage=usage,
model=model or "copilot-acp",
)
def _run_prompt(self, prompt_text: str, *, timeout_seconds: float) -> tuple[str, str]:
try:
proc = subprocess.Popen(
[self._acp_command] + self._acp_args,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
text=True,
bufsize=1,
cwd=self._acp_cwd,
)
except FileNotFoundError as exc:
raise RuntimeError(
f"Could not start Copilot ACP command '{self._acp_command}'. "
"Install GitHub Copilot CLI or set HERMES_COPILOT_ACP_COMMAND/COPILOT_CLI_PATH."
) from exc
if proc.stdin is None or proc.stdout is None:
proc.kill()
raise RuntimeError("Copilot ACP process did not expose stdin/stdout pipes.")
self.is_closed = False
with self._active_process_lock:
self._active_process = proc
inbox: queue.Queue[dict[str, Any]] = queue.Queue()
stderr_tail: deque[str] = deque(maxlen=40)
def _stdout_reader() -> None:
for line in proc.stdout:
try:
inbox.put(json.loads(line))
except Exception:
inbox.put({"raw": line.rstrip("\n")})
def _stderr_reader() -> None:
if proc.stderr is None:
return
for line in proc.stderr:
stderr_tail.append(line.rstrip("\n"))
out_thread = threading.Thread(target=_stdout_reader, daemon=True)
err_thread = threading.Thread(target=_stderr_reader, daemon=True)
out_thread.start()
err_thread.start()
next_id = 0
def _request(method: str, params: dict[str, Any], *, text_parts: list[str] | None = None, reasoning_parts: list[str] | None = None) -> Any:
nonlocal next_id
next_id += 1
request_id = next_id
payload = {
"jsonrpc": "2.0",
"id": request_id,
"method": method,
"params": params,
}
proc.stdin.write(json.dumps(payload) + "\n")
proc.stdin.flush()
deadline = time.time() + timeout_seconds
while time.time() < deadline:
if proc.poll() is not None:
break
try:
msg = inbox.get(timeout=0.1)
except queue.Empty:
continue
if self._handle_server_message(
msg,
process=proc,
cwd=self._acp_cwd,
text_parts=text_parts,
reasoning_parts=reasoning_parts,
):
continue
if msg.get("id") != request_id:
continue
if "error" in msg:
err = msg.get("error") or {}
raise RuntimeError(
f"Copilot ACP {method} failed: {err.get('message') or err}"
)
return msg.get("result")
stderr_text = "\n".join(stderr_tail).strip()
if proc.poll() is not None and stderr_text:
raise RuntimeError(f"Copilot ACP process exited early: {stderr_text}")
raise TimeoutError(f"Timed out waiting for Copilot ACP response to {method}.")
try:
_request(
"initialize",
{
"protocolVersion": 1,
"clientCapabilities": {
"fs": {
"readTextFile": True,
"writeTextFile": True,
}
},
"clientInfo": {
"name": "hermes-agent",
"title": "Hermes Agent",
"version": "0.0.0",
},
},
)
session = _request(
"session/new",
{
"cwd": self._acp_cwd,
"mcpServers": [],
},
) or {}
session_id = str(session.get("sessionId") or "").strip()
if not session_id:
raise RuntimeError("Copilot ACP did not return a sessionId.")
text_parts: list[str] = []
reasoning_parts: list[str] = []
_request(
"session/prompt",
{
"sessionId": session_id,
"prompt": [
{
"type": "text",
"text": prompt_text,
}
],
},
text_parts=text_parts,
reasoning_parts=reasoning_parts,
)
return "".join(text_parts), "".join(reasoning_parts)
finally:
self.close()
def _handle_server_message(
self,
msg: dict[str, Any],
*,
process: subprocess.Popen[str],
cwd: str,
text_parts: list[str] | None,
reasoning_parts: list[str] | None,
) -> bool:
method = msg.get("method")
if not isinstance(method, str):
return False
if method == "session/update":
params = msg.get("params") or {}
update = params.get("update") or {}
kind = str(update.get("sessionUpdate") or "").strip()
content = update.get("content") or {}
chunk_text = ""
if isinstance(content, dict):
chunk_text = str(content.get("text") or "")
if kind == "agent_message_chunk" and chunk_text and text_parts is not None:
text_parts.append(chunk_text)
elif kind == "agent_thought_chunk" and chunk_text and reasoning_parts is not None:
reasoning_parts.append(chunk_text)
return True
if process.stdin is None:
return True
message_id = msg.get("id")
params = msg.get("params") or {}
if method == "session/request_permission":
response = {
"jsonrpc": "2.0",
"id": message_id,
"result": {
"outcome": {
"outcome": "allow_once",
}
},
}
elif method == "fs/read_text_file":
try:
path = _ensure_path_within_cwd(str(params.get("path") or ""), cwd)
content = path.read_text() if path.exists() else ""
line = params.get("line")
limit = params.get("limit")
if isinstance(line, int) and line > 1:
lines = content.splitlines(keepends=True)
start = line - 1
end = start + limit if isinstance(limit, int) and limit > 0 else None
content = "".join(lines[start:end])
response = {
"jsonrpc": "2.0",
"id": message_id,
"result": {
"content": content,
},
}
except Exception as exc:
response = _jsonrpc_error(message_id, -32602, str(exc))
elif method == "fs/write_text_file":
try:
path = _ensure_path_within_cwd(str(params.get("path") or ""), cwd)
path.parent.mkdir(parents=True, exist_ok=True)
path.write_text(str(params.get("content") or ""))
response = {
"jsonrpc": "2.0",
"id": message_id,
"result": None,
}
except Exception as exc:
response = _jsonrpc_error(message_id, -32602, str(exc))
else:
response = _jsonrpc_error(
message_id,
-32601,
f"ACP client method '{method}' is not supported by Hermes yet.",
)
process.stdin.write(json.dumps(response) + "\n")
process.stdin.flush()
return True
|