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@@ -0,0 +1,375 @@
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+#!/usr/bin/env python3
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+"""
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+OpenAI-compatible facade in front of Ollama.
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+
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+1. Injects a SearXNG-backed `web_search` tool into every chat/completions request
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+2. Executes web_search tool calls server-side (non-streaming requests) and feeds
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+ the results back to the model before answering the client
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+3. All other tool calls (the client's own tools) are returned to the client
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+ untouched — the client runs its own tool loop
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+4. Streaming requests are passed straight through to Ollama (no probe), so the
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+ client keeps native SSE and thinking output. In that case, if the model calls
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+ web_search the client receives that tool_call.
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+
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+Ollama ignores the Authorization header (no API key), so clients may send any key.
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+"""
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+from flask import Flask, request, Response, stream_with_context
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+import requests
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+import json
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+import sys
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+import os
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+
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+app = Flask(__name__)
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+
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+sys.stdout.reconfigure(line_buffering=True)
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+sys.stderr.reconfigure(line_buffering=True)
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+
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+BACKEND_URL = os.environ.get("BACKEND_URL", "http://vllm:8000")
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+BACKEND_API_KEY = os.environ.get("BACKEND_API_KEY", "")
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+SEARXNG_URL = os.environ.get("SEARXNG_URL", "http://host.docker.internal:8889")
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+SEARXNG_RESULTS = int(os.environ.get("SEARXNG_RESULTS", "5"))
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+MAX_SEARCH_ITER = int(os.environ.get("MAX_SEARCH_ITER", "10"))
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+
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+SEARXNG_TOOL = {
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+ "type": "function",
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+ "function": {
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+ "name": "web_search",
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+ "description": (
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+ "Search the web for current information. Use this whenever you need "
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+ "up-to-date facts, recent events, or anything that may have changed "
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+ "since your training cutoff. Do not guess — call web_search instead."
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+ ),
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+ "parameters": {
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+ "type": "object",
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+ "properties": {
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+ "query": {
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+ "type": "string",
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+ "description": "The search query string"
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+ }
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+ },
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+ "required": ["query"]
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+ }
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+ }
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+}
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+
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+SEARCH_SYSTEM_MSG = (
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+ "You have access to a web_search tool. "
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+ "Use it whenever the user asks about current events, real-time data, recent news, "
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+ "live prices, weather, sports scores, or anything else that may have changed since "
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+ "your training cutoff. Do not say you cannot access the internet — call web_search instead."
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+)
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+
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+
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+def searxng_search(query):
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+ """Execute a search against SearXNG and return a formatted result string."""
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+ try:
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+ print(f"[SEARXNG] Searching: {query}")
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+ resp = requests.get(
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+ f"{SEARXNG_URL}/search",
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+ params={"q": query, "format": "json", "categories": "general"},
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+ timeout=15
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+ )
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+ resp.raise_for_status()
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+ data = resp.json()
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+ results = data.get("results", [])[:SEARXNG_RESULTS]
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+ if not results:
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+ return f"No results found for: {query}"
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+ lines = [f"Search results for: {query}\n"]
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+ for i, r in enumerate(results, 1):
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+ title = r.get("title", "No title")
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+ url = r.get("url", "")
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+ content = r.get("content", "").strip()
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+ lines.append(f"{i}. {title}")
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+ if url:
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+ lines.append(f" URL: {url}")
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+ if content:
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+ lines.append(f" {content}")
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+ lines.append("")
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+ return "\n".join(lines).strip()
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+ except Exception as e:
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+ print(f"[ERROR] SearXNG search failed: {e}")
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+ return f"Search failed: {e}"
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+
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+
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+def inject_search(json_data):
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+ """Inject web_search tool and system prompt nudge if not already present."""
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+ tools = json_data.setdefault('tools', [])
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+ names = {t.get('function', {}).get('name') for t in tools if isinstance(t, dict)}
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+ if 'web_search' not in names:
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+ tools.append(SEARXNG_TOOL)
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+ print("[INJECTED] Added web_search tool")
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+
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+ messages = json_data.setdefault('messages', [])
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+ already = any('web_search' in str(m.get('content') or '')
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+ for m in messages if m.get('role') == 'system')
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+ if not already:
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+ if messages and messages[0].get('role') == 'system':
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+ # Append to the existing first system message so we stay at position 0
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+ messages[0]['content'] = str(messages[0]['content']) + '\n\n' + SEARCH_SYSTEM_MSG
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+ print("[INJECTED] Appended web_search to existing system prompt")
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+ else:
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+ # No system message yet — prepend one at position 0
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+ messages.insert(0, {"role": "system", "content": SEARCH_SYSTEM_MSG})
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+ print("[INJECTED] Added web_search system prompt at position 0")
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+
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+
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+def call_backend_nonstream(json_data, headers):
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+ """Call backend with streaming off, return parsed JSON or raise."""
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+ data = dict(json_data)
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+ data['stream'] = False
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+ data.pop('stream_options', None)
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+ body = json.dumps(data).encode('utf-8')
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+ hdrs = {k: v for k, v in headers.items() if k.lower() != 'host'}
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+ if BACKEND_API_KEY:
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+ hdrs['Authorization'] = f'Bearer {BACKEND_API_KEY}'
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+ hdrs['Content-Length'] = str(len(body))
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+ hdrs['Content-Type'] = 'application/json'
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+ resp = requests.post(f"{BACKEND_URL}/v1/chat/completions",
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+ headers=hdrs, data=body, timeout=600)
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+ resp.raise_for_status()
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+ return resp.json()
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+
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+
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+def call_backend_passthrough(json_data, headers):
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+ """Forward request to backend as-is (preserving streaming), return raw Response."""
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+ body = json.dumps(json_data).encode('utf-8')
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+ hdrs = {k: v for k, v in headers.items() if k.lower() != 'host'}
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+ if BACKEND_API_KEY:
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+ hdrs['Authorization'] = f'Bearer {BACKEND_API_KEY}'
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+ hdrs['Content-Length'] = str(len(body))
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+ hdrs['Content-Type'] = 'application/json'
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+ sess = requests.Session()
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+ sess.headers.update(hdrs)
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+ resp = sess.post(f"{BACKEND_URL}/v1/chat/completions",
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+ data=body, stream=True, timeout=(10, 600))
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+
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+ def generate():
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+ count = 0
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+ try:
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+ for line in resp.iter_lines():
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+ if line:
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+ count += 1
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+ yield line + b'\n\n'
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+ print(f"[STREAM] Completed: {count} SSE lines forwarded")
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+ except Exception as e:
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+ print(f"[STREAM] ERROR after {count} lines: {e}")
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+ import traceback; traceback.print_exc()
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+
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+ out_headers = {k: v for k, v in resp.headers.items()
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+ if k.lower() in {'content-type', 'cache-control', 'x-accel-buffering'}}
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+ return Response(generate(), status=resp.status_code, headers=out_headers)
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+
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+
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+def run_loop(json_data, headers):
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+ """
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+ Non-streaming path. Calls the model, handles web_search calls transparently,
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+ returns to client when the model produces non-search output.
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+
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+ If the model calls the client's own tools alongside or instead of
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+ web_search, those are returned to the client immediately.
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+ """
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+ is_streaming = json_data.get('stream', False)
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+ internal = dict(json_data)
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+ internal['messages'] = list(json_data.get('messages', []))
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+
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+ searches = 0
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+ empty = 0
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+ for iteration in range(MAX_SEARCH_ITER):
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+ try:
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+ completion = call_backend_nonstream(internal, headers)
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+ except Exception as e:
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+ print(f"[ERROR] Backend call failed: {e}")
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+ import traceback; traceback.print_exc()
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+ return Response(
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+ json.dumps({'error': {'message': str(e), 'type': 'proxy_error'}}).encode(),
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+ status=502, headers={'Content-Type': 'application/json'}
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+ )
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+
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+ choice = completion.get('choices', [{}])[0]
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+ message = choice.get('message', {})
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+ tool_calls = message.get('tool_calls') or []
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+
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+ search_calls = [tc for tc in tool_calls if tc.get('function', {}).get('name') == 'web_search']
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+ client_calls = [tc for tc in tool_calls if tc.get('function', {}).get('name') != 'web_search']
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+
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+ if not search_calls:
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+ print(f"[LOOP] Done after {iteration} search iteration(s)")
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+ if client_calls:
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+ print(f"[LOOP] Returning {len(client_calls)} client tool call(s) to client")
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+ if iteration == 0 and is_streaming:
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+ print("[LOOP] No search needed, passing through natively")
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+ return call_backend_passthrough(json_data, headers)
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+ if is_streaming:
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+ return _stream_completion(completion)
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+ return Response(json.dumps(completion).encode(),
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+ status=200, headers={'Content-Type': 'application/json'})
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+
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+ # Model wants to search — execute and loop
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+ print(f"[LOOP] Iteration {iteration}: {len(search_calls)} search call(s), "
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+ f"{len(client_calls)} client call(s)")
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+
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+ asst = {"role": "assistant", "tool_calls": tool_calls}
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+ if message.get('content'):
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+ asst['content'] = message['content']
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+ internal['messages'].append(asst)
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+
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+ for tc in search_calls:
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+ try:
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+ args = json.loads(tc.get('function', {}).get('arguments', '{}'))
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+ except Exception:
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+ args = {}
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+ result = searxng_search(args.get('query', ''))
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+ searches += 1
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+ if result.startswith(("No results found", "Search failed")):
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+ empty += 1
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+ print(f"[LOOP] Search returned {len(result)} chars")
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+ internal['messages'].append({
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+ "role": "tool",
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+ "tool_call_id": tc.get('id', 'search_result'),
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+ "content": result
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+ })
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+
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+ # Client tool calls that arrive alongside a search cannot be executed
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+ # here — stub them so the model does not stall waiting for results
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+ for tc in client_calls:
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+ name = tc.get('function', {}).get('name', 'unknown')
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+ internal['messages'].append({
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+ "role": "tool",
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+ "tool_call_id": tc.get('id', 'stub'),
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+ "content": f"[{name} result will be provided by the user's environment]"
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+ })
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+
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+ print(f"[ERROR] Exceeded max search iterations ({searches} searches, {empty} empty)")
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+ hint = " — SearXNG returned no usable results; check the SearXNG engines" if empty else ""
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+ return Response(
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+ json.dumps({'error': {
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+ 'message': f'Exceeded max search iterations ({searches} searches, {empty} empty){hint}',
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+ 'type': 'proxy_error'}}).encode(),
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+ status=500, headers={'Content-Type': 'application/json'}
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+ )
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+
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+
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+def _stream_completion(completion):
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+ """Re-stream a non-streaming completion as SSE."""
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+ choice = completion.get('choices', [{}])[0]
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+ message = choice.get('message', {})
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+ content = message.get('content') or ''
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+ reasoning = message.get('reasoning') or message.get('reasoning_content') or ''
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+ tool_calls = message.get('tool_calls') or []
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+ finish_reason = choice.get('finish_reason', 'stop')
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+ cid = completion.get('id', 'chatcmpl-search')
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+ model = completion.get('model', 'unknown')
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+ usage = completion.get('usage')
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+
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+ def generate():
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+ yield _sse({'id': cid, 'object': 'chat.completion.chunk', 'model': model,
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+ 'choices': [{'index': 0, 'delta': {'role': 'assistant', 'content': ''},
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+ 'finish_reason': None}]})
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+
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+ if tool_calls:
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+ for i, tc in enumerate(tool_calls):
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+ yield _sse({'id': cid, 'object': 'chat.completion.chunk', 'model': model,
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+ 'choices': [{'index': 0, 'delta': {'tool_calls': [{
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+ 'index': i,
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+ 'id': tc.get('id', ''),
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+ 'type': 'function',
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+ 'function': {
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+ 'name': tc.get('function', {}).get('name', ''),
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+ 'arguments': tc.get('function', {}).get('arguments', '')
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+ }
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+ }]}, 'finish_reason': None}]})
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+ else:
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+ if reasoning:
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+ for i in range(0, len(reasoning), 64):
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+ yield _sse({'id': cid, 'object': 'chat.completion.chunk', 'model': model,
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+ 'choices': [{'index': 0, 'delta': {'reasoning_content': reasoning[i:i + 64]},
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+ 'finish_reason': None}]})
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+ for i in range(0, max(len(content), 1), 64):
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+ yield _sse({'id': cid, 'object': 'chat.completion.chunk', 'model': model,
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+ 'choices': [{'index': 0, 'delta': {'content': content[i:i + 64]},
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+ 'finish_reason': None}]})
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+
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+ final = {'id': cid, 'object': 'chat.completion.chunk', 'model': model,
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+ 'choices': [{'index': 0, 'delta': {}, 'finish_reason': finish_reason}]}
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+ if usage:
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+ final['usage'] = usage
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+ yield _sse(final)
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+ yield b"data: [DONE]\n\n"
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+
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+ return Response(stream_with_context(generate()), status=200,
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+ headers={'Content-Type': 'text/event-stream',
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+ 'Cache-Control': 'no-cache',
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+ 'X-Accel-Buffering': 'no'})
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+
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+
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+def _sse(obj):
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+ return f"data: {json.dumps(obj)}\n\n".encode()
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+
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+
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+def forward(method, url, headers, data):
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+ """Transparently forward a request and stream the response back."""
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+ hdrs = {k: v for k, v in headers.items() if k.lower() != 'host'}
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+ if BACKEND_API_KEY:
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+ hdrs['Authorization'] = f'Bearer {BACKEND_API_KEY}'
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+ sess = requests.Session()
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+ sess.headers.update(hdrs)
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+ resp = sess.request(method=method, url=url, data=data,
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+ stream=True, timeout=(10, 600))
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+
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+ def generate():
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+ for line in resp.iter_lines():
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+ if line:
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+ yield line + b'\n\n'
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+
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+ out_headers = {k: v for k, v in resp.headers.items()
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+ if k.lower() in {'content-type', 'cache-control', 'x-accel-buffering'}}
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+ return Response(generate(), status=resp.status_code, headers=out_headers)
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+
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+
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[email protected]('/<path:path>', methods=['GET', 'POST', 'PUT', 'DELETE', 'PATCH'])
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+def proxy(path):
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+ url = f"{BACKEND_URL}/{path}"
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+ headers = dict(request.headers)
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+ headers.pop('Host', None)
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+ data = request.get_data()
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+
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+ if request.method == 'POST' and '/chat/completions' in path:
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+ try:
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+ json_data = json.loads(data)
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+ client_tools = json_data.get('tools', [])
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+ is_streaming = json_data.get('stream', False)
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+ print(f"[DEBUG] Request keys: {list(json_data.keys())}, "
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+ f"tools={len(client_tools)}, stream={is_streaming}")
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+
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+ inject_search(json_data)
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+
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+ if is_streaming:
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+ print("[FASTPATH] Streaming request — skipping probe, passing through natively")
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+ return call_backend_passthrough(json_data, headers)
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+
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+ return run_loop(json_data, headers)
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+
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+ except Exception as e:
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+ print(f"[ERROR] {e}")
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+ import traceback; traceback.print_exc()
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+ return Response(
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+ json.dumps({'error': {'message': str(e), 'type': 'proxy_error'}}).encode(),
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+ status=500, headers={'Content-Type': 'application/json'}
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+ )
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+
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+ # Non-chat requests — forward directly
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+ try:
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+ return forward(request.method, url, headers, data)
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+ except Exception as e:
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+ print(f"[ERROR] Request failed: {e}")
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+ return Response(
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+ json.dumps({'error': {'message': str(e)}}).encode(),
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+ status=500, headers={'Content-Type': 'application/json'}
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+ )
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+
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+
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+if __name__ == '__main__':
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+ print("Starting PASSTHROUGH+SEARCH proxy (Ollama backend)")
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+ print(f"Forwarding to: {BACKEND_URL}")
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+ print(f"SearXNG: {SEARXNG_URL} (max {SEARXNG_RESULTS} results per search)")
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+ app.run(host='0.0.0.0', port=11536, threaded=True)
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Krasimir Kazakov
5 dní pred