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Cyber Catalyst Team commited on
Commit ·
da93542
0
Parent(s):
Initial: Agentic backend with NIM + tools
Browse files- Dockerfile +28 -0
- README.md +14 -0
- backend.py +668 -0
- requirements.txt +5 -0
Dockerfile
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FROM python:3.11-slim
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# Install system dependencies
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RUN apt-get update && apt-get install -y --no-install-recommends \
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git bash curl && \
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rm -rf /var/lib/apt/lists/*
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# Create non-root user (HF requirement: uid 1000)
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RUN useradd -m -u 1000 user
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USER user
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ENV HOME=/home/user \
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PATH=/home/user/.local/bin:$PATH
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WORKDIR $HOME/app
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# Install Python dependencies
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COPY --chown=user requirements.txt .
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RUN pip install --no-cache-dir --user -r requirements.txt
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# Copy application
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COPY --chown=user backend.py .
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# Create workspace directory
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RUN mkdir -p /tmp/workspace
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EXPOSE 7860
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CMD ["python", "backend.py"]
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README.md
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---
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title: claude-code-backend
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emoji: 🤖
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colorFrom: blue
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colorTo: purple
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sdk: docker
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app_port: 7860
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---
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# Claude Code Backend
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Agentic coding backend powered by NVIDIA NIM models. Provides Claude-Code-like capabilities (Read, Write, Edit, Bash, Grep) through an OpenAI-compatible API.
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Used as a backend provider for [better-chatbot](https://huggingface.co/spaces/augment17/better-chatbot).
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backend.py
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| 1 |
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"""
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| 2 |
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Claude Code Backend — Agentic coding backend powered by NVIDIA NIM models.
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| 3 |
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Exposes an OpenAI-compatible /v1/chat/completions endpoint with built-in
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| 4 |
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tools for file operations and bash execution.
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| 5 |
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| 6 |
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Architecture:
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| 7 |
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Space 1 (better-chatbot) --> this backend --> NVIDIA NIM API
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| 8 |
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The agentic loop:
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| 10 |
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1. Receive user message from Space 1
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| 11 |
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2. Send to NIM model with tool definitions
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| 12 |
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3. If model returns tool_calls, execute them and loop
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| 13 |
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4. If model returns text, stream it back to Space 1
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| 14 |
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5. Persist conversation in Postgres
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| 15 |
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"""
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import os
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| 18 |
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import json
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import uuid
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import subprocess
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import asyncio
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| 22 |
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import time
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| 23 |
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from pathlib import Path
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| 24 |
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from typing import AsyncIterator, Optional
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| 25 |
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| 26 |
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from fastapi import FastAPI, Request, Header, HTTPException
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| 27 |
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from fastapi.responses import StreamingResponse, JSONResponse
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| 28 |
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from fastapi.middleware.cors import CORSMiddleware
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| 29 |
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from openai import AsyncOpenAI
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| 30 |
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import asyncpg
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| 31 |
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| 32 |
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# ---------------------------------------------------------------------------
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| 33 |
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# Configuration
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| 34 |
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# ---------------------------------------------------------------------------
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| 35 |
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| 36 |
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NIM_API_KEY = os.environ.get("NVIDIA_NIM_API_KEY", "")
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| 37 |
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BACKEND_API_KEY = os.environ.get("BACKEND_API_KEY", "")
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| 38 |
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DATABASE_URL = os.environ.get("DATABASE_URL", "")
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| 39 |
+
WORKSPACE_DIR = os.environ.get("WORKSPACE_DIR", "/tmp/workspace")
|
| 40 |
+
MAX_TOOL_ROUNDS = int(os.environ.get("MAX_TOOL_ROUNDS", "10"))
|
| 41 |
+
|
| 42 |
+
# NIM models that reliably support tool/function calling
|
| 43 |
+
TOOL_CAPABLE_MODELS = {
|
| 44 |
+
"meta/llama-3.1-70b-instruct": "Llama 3.1 70B (Agentic)",
|
| 45 |
+
"meta/llama-3.1-405b-instruct": "Llama 3.1 405B (Agentic)",
|
| 46 |
+
"qwen/qwen2.5-coder-32b-instruct": "Qwen 2.5 Coder 32B (Agentic)",
|
| 47 |
+
"nvidia/llama-3.1-nemotron-70b-instruct": "Nemotron 70B (Agentic)",
|
| 48 |
+
"meta/llama-3.3-70b-instruct": "Llama 3.3 70B (Agentic)",
|
| 49 |
+
}
|
| 50 |
+
|
| 51 |
+
# All models (tool-capable get agentic mode, others get plain chat)
|
| 52 |
+
ALL_MODELS = {
|
| 53 |
+
**TOOL_CAPABLE_MODELS,
|
| 54 |
+
"deepseek-ai/deepseek-r1": "DeepSeek R1 (Chat only)",
|
| 55 |
+
"mistralai/mistral-large-2-instruct": "Mistral Large 2 (Chat only)",
|
| 56 |
+
}
|
| 57 |
+
|
| 58 |
+
# Ensure workspace exists
|
| 59 |
+
Path(WORKSPACE_DIR).mkdir(parents=True, exist_ok=True)
|
| 60 |
+
|
| 61 |
+
# ---------------------------------------------------------------------------
|
| 62 |
+
# NIM Client
|
| 63 |
+
# ---------------------------------------------------------------------------
|
| 64 |
+
|
| 65 |
+
nim_client = AsyncOpenAI(
|
| 66 |
+
base_url="https://integrate.api.nvidia.com/v1",
|
| 67 |
+
api_key=NIM_API_KEY,
|
| 68 |
+
)
|
| 69 |
+
|
| 70 |
+
# ---------------------------------------------------------------------------
|
| 71 |
+
# Tool Definitions (OpenAI function calling format)
|
| 72 |
+
# ---------------------------------------------------------------------------
|
| 73 |
+
|
| 74 |
+
TOOLS = [
|
| 75 |
+
{
|
| 76 |
+
"type": "function",
|
| 77 |
+
"function": {
|
| 78 |
+
"name": "read_file",
|
| 79 |
+
"description": "Read the contents of a file. Use this to inspect existing code, configs, or any text file.",
|
| 80 |
+
"parameters": {
|
| 81 |
+
"type": "object",
|
| 82 |
+
"properties": {
|
| 83 |
+
"path": {
|
| 84 |
+
"type": "string",
|
| 85 |
+
"description": "Relative path to the file from the workspace root"
|
| 86 |
+
}
|
| 87 |
+
},
|
| 88 |
+
"required": ["path"]
|
| 89 |
+
}
|
| 90 |
+
}
|
| 91 |
+
},
|
| 92 |
+
{
|
| 93 |
+
"type": "function",
|
| 94 |
+
"function": {
|
| 95 |
+
"name": "write_file",
|
| 96 |
+
"description": "Write content to a file. Creates the file if it doesn't exist, overwrites if it does. Creates parent directories automatically.",
|
| 97 |
+
"parameters": {
|
| 98 |
+
"type": "object",
|
| 99 |
+
"properties": {
|
| 100 |
+
"path": {
|
| 101 |
+
"type": "string",
|
| 102 |
+
"description": "Relative path to the file from the workspace root"
|
| 103 |
+
},
|
| 104 |
+
"content": {
|
| 105 |
+
"type": "string",
|
| 106 |
+
"description": "The full content to write to the file"
|
| 107 |
+
}
|
| 108 |
+
},
|
| 109 |
+
"required": ["path", "content"]
|
| 110 |
+
}
|
| 111 |
+
}
|
| 112 |
+
},
|
| 113 |
+
{
|
| 114 |
+
"type": "function",
|
| 115 |
+
"function": {
|
| 116 |
+
"name": "run_bash",
|
| 117 |
+
"description": "Execute a bash command in the workspace directory. Use for installing packages, running scripts, git operations, etc. Commands run with a 30 second timeout.",
|
| 118 |
+
"parameters": {
|
| 119 |
+
"type": "object",
|
| 120 |
+
"properties": {
|
| 121 |
+
"command": {
|
| 122 |
+
"type": "string",
|
| 123 |
+
"description": "The bash command to execute"
|
| 124 |
+
}
|
| 125 |
+
},
|
| 126 |
+
"required": ["command"]
|
| 127 |
+
}
|
| 128 |
+
}
|
| 129 |
+
},
|
| 130 |
+
{
|
| 131 |
+
"type": "function",
|
| 132 |
+
"function": {
|
| 133 |
+
"name": "list_directory",
|
| 134 |
+
"description": "List files and directories in a given path. Shows file sizes and directory markers.",
|
| 135 |
+
"parameters": {
|
| 136 |
+
"type": "object",
|
| 137 |
+
"properties": {
|
| 138 |
+
"path": {
|
| 139 |
+
"type": "string",
|
| 140 |
+
"description": "Relative path to the directory from workspace root. Use '.' for the workspace root."
|
| 141 |
+
}
|
| 142 |
+
},
|
| 143 |
+
"required": ["path"]
|
| 144 |
+
}
|
| 145 |
+
}
|
| 146 |
+
},
|
| 147 |
+
{
|
| 148 |
+
"type": "function",
|
| 149 |
+
"function": {
|
| 150 |
+
"name": "grep_search",
|
| 151 |
+
"description": "Search for a pattern in files within the workspace. Returns matching lines with file paths and line numbers.",
|
| 152 |
+
"parameters": {
|
| 153 |
+
"type": "object",
|
| 154 |
+
"properties": {
|
| 155 |
+
"pattern": {
|
| 156 |
+
"type": "string",
|
| 157 |
+
"description": "The search pattern (supports basic regex)"
|
| 158 |
+
},
|
| 159 |
+
"path": {
|
| 160 |
+
"type": "string",
|
| 161 |
+
"description": "Directory or file to search in, relative to workspace root. Defaults to '.'",
|
| 162 |
+
}
|
| 163 |
+
},
|
| 164 |
+
"required": ["pattern"]
|
| 165 |
+
}
|
| 166 |
+
}
|
| 167 |
+
},
|
| 168 |
+
]
|
| 169 |
+
|
| 170 |
+
# ---------------------------------------------------------------------------
|
| 171 |
+
# Tool Execution
|
| 172 |
+
# ---------------------------------------------------------------------------
|
| 173 |
+
|
| 174 |
+
def _safe_path(rel_path: str) -> Path:
|
| 175 |
+
"""Resolve a relative path safely within the workspace."""
|
| 176 |
+
workspace = Path(WORKSPACE_DIR).resolve()
|
| 177 |
+
target = (workspace / rel_path).resolve()
|
| 178 |
+
# Prevent path traversal
|
| 179 |
+
if not str(target).startswith(str(workspace)):
|
| 180 |
+
raise ValueError(f"Path traversal detected: {rel_path}")
|
| 181 |
+
return target
|
| 182 |
+
|
| 183 |
+
|
| 184 |
+
def execute_tool(name: str, arguments: dict) -> str:
|
| 185 |
+
"""Execute a tool and return its output as a string."""
|
| 186 |
+
try:
|
| 187 |
+
if name == "read_file":
|
| 188 |
+
path = _safe_path(arguments["path"])
|
| 189 |
+
if not path.exists():
|
| 190 |
+
return f"Error: File not found: {arguments['path']}"
|
| 191 |
+
if not path.is_file():
|
| 192 |
+
return f"Error: Not a file: {arguments['path']}"
|
| 193 |
+
content = path.read_text(encoding="utf-8", errors="replace")
|
| 194 |
+
if len(content) > 50000:
|
| 195 |
+
return content[:50000] + f"\n\n[Truncated — file is {len(content)} chars]"
|
| 196 |
+
return content
|
| 197 |
+
|
| 198 |
+
elif name == "write_file":
|
| 199 |
+
path = _safe_path(arguments["path"])
|
| 200 |
+
path.parent.mkdir(parents=True, exist_ok=True)
|
| 201 |
+
path.write_text(arguments["content"], encoding="utf-8")
|
| 202 |
+
return f"Successfully wrote {len(arguments['content'])} chars to {arguments['path']}"
|
| 203 |
+
|
| 204 |
+
elif name == "run_bash":
|
| 205 |
+
command = arguments["command"]
|
| 206 |
+
# Safety: block dangerous commands
|
| 207 |
+
blocked = ["rm -rf /", "mkfs", "dd if=", ":(){", "fork bomb"]
|
| 208 |
+
if any(b in command.lower() for b in blocked):
|
| 209 |
+
return "Error: Command blocked for safety reasons"
|
| 210 |
+
result = subprocess.run(
|
| 211 |
+
["bash", "-c", command],
|
| 212 |
+
cwd=WORKSPACE_DIR,
|
| 213 |
+
capture_output=True,
|
| 214 |
+
text=True,
|
| 215 |
+
timeout=30,
|
| 216 |
+
env={**os.environ, "HOME": "/tmp", "PATH": os.environ.get("PATH", "/usr/local/bin:/usr/bin:/bin")},
|
| 217 |
+
)
|
| 218 |
+
output = ""
|
| 219 |
+
if result.stdout:
|
| 220 |
+
output += result.stdout
|
| 221 |
+
if result.stderr:
|
| 222 |
+
output += ("\n" if output else "") + f"[stderr] {result.stderr}"
|
| 223 |
+
if result.returncode != 0:
|
| 224 |
+
output += f"\n[exit code: {result.returncode}]"
|
| 225 |
+
if not output:
|
| 226 |
+
output = "[command completed with no output]"
|
| 227 |
+
# Truncate very long outputs
|
| 228 |
+
if len(output) > 20000:
|
| 229 |
+
output = output[:20000] + f"\n\n[Truncated — output is {len(output)} chars]"
|
| 230 |
+
return output
|
| 231 |
+
|
| 232 |
+
elif name == "list_directory":
|
| 233 |
+
path = _safe_path(arguments.get("path", "."))
|
| 234 |
+
if not path.exists():
|
| 235 |
+
return f"Error: Directory not found: {arguments.get('path', '.')}"
|
| 236 |
+
if not path.is_dir():
|
| 237 |
+
return f"Error: Not a directory: {arguments.get('path', '.')}"
|
| 238 |
+
entries = []
|
| 239 |
+
for item in sorted(path.iterdir()):
|
| 240 |
+
if item.is_dir():
|
| 241 |
+
entries.append(f" 📁 {item.name}/")
|
| 242 |
+
else:
|
| 243 |
+
size = item.stat().st_size
|
| 244 |
+
if size < 1024:
|
| 245 |
+
size_str = f"{size}B"
|
| 246 |
+
elif size < 1024 * 1024:
|
| 247 |
+
size_str = f"{size/1024:.1f}KB"
|
| 248 |
+
else:
|
| 249 |
+
size_str = f"{size/(1024*1024):.1f}MB"
|
| 250 |
+
entries.append(f" 📄 {item.name} ({size_str})")
|
| 251 |
+
return f"Contents of {arguments.get('path', '.')}:\n" + "\n".join(entries) if entries else "Empty directory"
|
| 252 |
+
|
| 253 |
+
elif name == "grep_search":
|
| 254 |
+
pattern = arguments["pattern"]
|
| 255 |
+
search_path = arguments.get("path", ".")
|
| 256 |
+
path = _safe_path(search_path)
|
| 257 |
+
result = subprocess.run(
|
| 258 |
+
["grep", "-rn", "--include=*", pattern, str(path)],
|
| 259 |
+
capture_output=True,
|
| 260 |
+
text=True,
|
| 261 |
+
timeout=10,
|
| 262 |
+
cwd=WORKSPACE_DIR,
|
| 263 |
+
)
|
| 264 |
+
output = result.stdout if result.stdout else "No matches found"
|
| 265 |
+
if len(output) > 10000:
|
| 266 |
+
output = output[:10000] + "\n\n[Truncated]"
|
| 267 |
+
return output
|
| 268 |
+
|
| 269 |
+
else:
|
| 270 |
+
return f"Error: Unknown tool: {name}"
|
| 271 |
+
|
| 272 |
+
except subprocess.TimeoutExpired:
|
| 273 |
+
return "Error: Command timed out after 30 seconds"
|
| 274 |
+
except ValueError as e:
|
| 275 |
+
return f"Error: {str(e)}"
|
| 276 |
+
except Exception as e:
|
| 277 |
+
return f"Error executing {name}: {str(e)}"
|
| 278 |
+
|
| 279 |
+
|
| 280 |
+
# ---------------------------------------------------------------------------
|
| 281 |
+
# Database (Session Persistence)
|
| 282 |
+
# ---------------------------------------------------------------------------
|
| 283 |
+
|
| 284 |
+
db_pool: Optional[asyncpg.Pool] = None
|
| 285 |
+
|
| 286 |
+
|
| 287 |
+
async def init_db():
|
| 288 |
+
"""Initialize database connection pool and create tables."""
|
| 289 |
+
global db_pool
|
| 290 |
+
if not DATABASE_URL:
|
| 291 |
+
return
|
| 292 |
+
try:
|
| 293 |
+
db_pool = await asyncpg.create_pool(DATABASE_URL, ssl="require", min_size=1, max_size=5)
|
| 294 |
+
async with db_pool.acquire() as conn:
|
| 295 |
+
await conn.execute("""
|
| 296 |
+
CREATE TABLE IF NOT EXISTS agent_sessions (
|
| 297 |
+
id BIGSERIAL PRIMARY KEY,
|
| 298 |
+
session_id TEXT NOT NULL,
|
| 299 |
+
role TEXT NOT NULL,
|
| 300 |
+
content TEXT,
|
| 301 |
+
tool_calls JSONB,
|
| 302 |
+
tool_call_id TEXT,
|
| 303 |
+
created_at TIMESTAMPTZ DEFAULT NOW()
|
| 304 |
+
);
|
| 305 |
+
CREATE INDEX IF NOT EXISTS idx_agent_sessions_sid ON agent_sessions(session_id);
|
| 306 |
+
""")
|
| 307 |
+
except Exception as e:
|
| 308 |
+
print(f"[DB] Warning: Could not initialize database: {e}")
|
| 309 |
+
db_pool = None
|
| 310 |
+
|
| 311 |
+
|
| 312 |
+
async def save_message(session_id: str, role: str, content: str = None,
|
| 313 |
+
tool_calls: list = None, tool_call_id: str = None):
|
| 314 |
+
"""Save a message to the session store."""
|
| 315 |
+
if not db_pool:
|
| 316 |
+
return
|
| 317 |
+
try:
|
| 318 |
+
async with db_pool.acquire() as conn:
|
| 319 |
+
await conn.execute(
|
| 320 |
+
"INSERT INTO agent_sessions (session_id, role, content, tool_calls, tool_call_id) VALUES ($1, $2, $3, $4, $5)",
|
| 321 |
+
session_id, role, content,
|
| 322 |
+
json.dumps(tool_calls) if tool_calls else None,
|
| 323 |
+
tool_call_id,
|
| 324 |
+
)
|
| 325 |
+
except Exception as e:
|
| 326 |
+
print(f"[DB] Warning: Could not save message: {e}")
|
| 327 |
+
|
| 328 |
+
|
| 329 |
+
async def load_session(session_id: str) -> list:
|
| 330 |
+
"""Load conversation history from the session store."""
|
| 331 |
+
if not db_pool:
|
| 332 |
+
return []
|
| 333 |
+
try:
|
| 334 |
+
async with db_pool.acquire() as conn:
|
| 335 |
+
rows = await conn.fetch(
|
| 336 |
+
"SELECT role, content, tool_calls, tool_call_id FROM agent_sessions WHERE session_id = $1 ORDER BY id",
|
| 337 |
+
session_id,
|
| 338 |
+
)
|
| 339 |
+
messages = []
|
| 340 |
+
for row in rows:
|
| 341 |
+
msg = {"role": row["role"]}
|
| 342 |
+
if row["content"]:
|
| 343 |
+
msg["content"] = row["content"]
|
| 344 |
+
if row["tool_calls"]:
|
| 345 |
+
msg["tool_calls"] = json.loads(row["tool_calls"])
|
| 346 |
+
if row["tool_call_id"]:
|
| 347 |
+
msg["tool_call_id"] = row["tool_call_id"]
|
| 348 |
+
messages.append(msg)
|
| 349 |
+
return messages
|
| 350 |
+
except Exception as e:
|
| 351 |
+
print(f"[DB] Warning: Could not load session: {e}")
|
| 352 |
+
return []
|
| 353 |
+
|
| 354 |
+
|
| 355 |
+
# ---------------------------------------------------------------------------
|
| 356 |
+
# SSE Chunk Formatting (OpenAI delta format)
|
| 357 |
+
# ---------------------------------------------------------------------------
|
| 358 |
+
|
| 359 |
+
def make_chunk(request_id: str, model: str, content: str = "", finish_reason: str = None) -> str:
|
| 360 |
+
"""Create an OpenAI-compatible SSE chunk."""
|
| 361 |
+
delta = {}
|
| 362 |
+
if content:
|
| 363 |
+
delta["content"] = content
|
| 364 |
+
if finish_reason and not content:
|
| 365 |
+
delta = {}
|
| 366 |
+
|
| 367 |
+
chunk = {
|
| 368 |
+
"id": f"chatcmpl-{request_id}",
|
| 369 |
+
"object": "chat.completion.chunk",
|
| 370 |
+
"created": int(time.time()),
|
| 371 |
+
"model": model,
|
| 372 |
+
"choices": [{
|
| 373 |
+
"index": 0,
|
| 374 |
+
"delta": delta,
|
| 375 |
+
"finish_reason": finish_reason,
|
| 376 |
+
}],
|
| 377 |
+
}
|
| 378 |
+
return f"data: {json.dumps(chunk)}\n\n"
|
| 379 |
+
|
| 380 |
+
|
| 381 |
+
# ---------------------------------------------------------------------------
|
| 382 |
+
# FastAPI Application
|
| 383 |
+
# ---------------------------------------------------------------------------
|
| 384 |
+
|
| 385 |
+
app = FastAPI(title="Claude Code Backend", version="1.0.0")
|
| 386 |
+
app.add_middleware(
|
| 387 |
+
CORSMiddleware,
|
| 388 |
+
allow_origins=["*"],
|
| 389 |
+
allow_methods=["*"],
|
| 390 |
+
allow_headers=["*"],
|
| 391 |
+
)
|
| 392 |
+
|
| 393 |
+
|
| 394 |
+
def auth(authorization: str = None):
|
| 395 |
+
"""Verify bearer token."""
|
| 396 |
+
if not BACKEND_API_KEY:
|
| 397 |
+
return # No auth configured
|
| 398 |
+
expected = f"Bearer {BACKEND_API_KEY}"
|
| 399 |
+
if authorization != expected:
|
| 400 |
+
raise HTTPException(status_code=401, detail="Unauthorized")
|
| 401 |
+
|
| 402 |
+
|
| 403 |
+
@app.on_event("startup")
|
| 404 |
+
async def startup():
|
| 405 |
+
await init_db()
|
| 406 |
+
Path(WORKSPACE_DIR).mkdir(parents=True, exist_ok=True)
|
| 407 |
+
print(f"[Backend] Started. Workspace: {WORKSPACE_DIR}")
|
| 408 |
+
print(f"[Backend] Tool-capable models: {list(TOOL_CAPABLE_MODELS.keys())}")
|
| 409 |
+
print(f"[Backend] DB connected: {db_pool is not None}")
|
| 410 |
+
|
| 411 |
+
|
| 412 |
+
# ---------------------------------------------------------------------------
|
| 413 |
+
# /v1/chat/completions — Main endpoint
|
| 414 |
+
# ---------------------------------------------------------------------------
|
| 415 |
+
|
| 416 |
+
AGENTIC_SYSTEM_PROMPT = """You are an expert coding assistant with access to tools for file operations and command execution.
|
| 417 |
+
|
| 418 |
+
When the user asks you to create, edit, or debug code:
|
| 419 |
+
1. Use `list_directory` and `read_file` to understand the current state
|
| 420 |
+
2. Use `write_file` to create or modify files
|
| 421 |
+
3. Use `run_bash` to execute commands (install packages, run scripts, test code)
|
| 422 |
+
4. Use `grep_search` to find patterns in code
|
| 423 |
+
|
| 424 |
+
IMPORTANT RULES:
|
| 425 |
+
- Always use tools to take action. Do NOT just describe what to do — actually DO it.
|
| 426 |
+
- After writing code, run it to verify it works.
|
| 427 |
+
- If a command fails, read the error and fix it.
|
| 428 |
+
- Work in the /tmp/workspace directory.
|
| 429 |
+
- Be concise in your explanations, but thorough in your tool usage.
|
| 430 |
+
"""
|
| 431 |
+
|
| 432 |
+
|
| 433 |
+
@app.post("/v1/chat/completions")
|
| 434 |
+
async def chat_completions(request: Request, authorization: str = Header(None)):
|
| 435 |
+
auth(authorization)
|
| 436 |
+
body = await request.json()
|
| 437 |
+
|
| 438 |
+
requested_model = body.get("model", "meta/llama-3.1-70b-instruct")
|
| 439 |
+
messages = body.get("messages", [])
|
| 440 |
+
stream = body.get("stream", False)
|
| 441 |
+
session_id = body.get("session_id") or str(uuid.uuid4())
|
| 442 |
+
|
| 443 |
+
is_agentic = requested_model in TOOL_CAPABLE_MODELS
|
| 444 |
+
request_id = str(uuid.uuid4())[:8]
|
| 445 |
+
|
| 446 |
+
# Build message history
|
| 447 |
+
final_messages = []
|
| 448 |
+
|
| 449 |
+
# Add agentic system prompt for tool-capable models
|
| 450 |
+
if is_agentic:
|
| 451 |
+
# Check if there's already a system message
|
| 452 |
+
has_system = any(m.get("role") == "system" for m in messages)
|
| 453 |
+
if has_system:
|
| 454 |
+
# Prepend agentic prompt to existing system message
|
| 455 |
+
for m in messages:
|
| 456 |
+
if m["role"] == "system":
|
| 457 |
+
final_messages.append({
|
| 458 |
+
"role": "system",
|
| 459 |
+
"content": AGENTIC_SYSTEM_PROMPT + "\n\nAdditional instructions:\n" + m["content"]
|
| 460 |
+
})
|
| 461 |
+
else:
|
| 462 |
+
final_messages.append(m)
|
| 463 |
+
else:
|
| 464 |
+
final_messages.append({"role": "system", "content": AGENTIC_SYSTEM_PROMPT})
|
| 465 |
+
final_messages.extend(messages)
|
| 466 |
+
else:
|
| 467 |
+
final_messages = list(messages)
|
| 468 |
+
|
| 469 |
+
# Save the user's message to DB
|
| 470 |
+
user_msg = next((m for m in reversed(messages) if m.get("role") == "user"), None)
|
| 471 |
+
if user_msg:
|
| 472 |
+
await save_message(session_id, "user", user_msg.get("content", ""))
|
| 473 |
+
|
| 474 |
+
if not stream:
|
| 475 |
+
# Non-streaming: simple completion
|
| 476 |
+
try:
|
| 477 |
+
kwargs = {"model": requested_model, "messages": final_messages}
|
| 478 |
+
if is_agentic:
|
| 479 |
+
kwargs["tools"] = TOOLS
|
| 480 |
+
kwargs["tool_choice"] = "auto"
|
| 481 |
+
response = await nim_client.chat.completions.create(**kwargs)
|
| 482 |
+
content = response.choices[0].message.content or ""
|
| 483 |
+
await save_message(session_id, "assistant", content)
|
| 484 |
+
return JSONResponse({
|
| 485 |
+
"id": f"chatcmpl-{request_id}",
|
| 486 |
+
"object": "chat.completion",
|
| 487 |
+
"created": int(time.time()),
|
| 488 |
+
"model": requested_model,
|
| 489 |
+
"choices": [{"index": 0, "message": {"role": "assistant", "content": content}, "finish_reason": "stop"}],
|
| 490 |
+
})
|
| 491 |
+
except Exception as e:
|
| 492 |
+
return JSONResponse({"error": {"message": str(e), "type": "internal_error"}}, status_code=500)
|
| 493 |
+
|
| 494 |
+
# Streaming + agentic loop
|
| 495 |
+
async def generate() -> AsyncIterator[str]:
|
| 496 |
+
nonlocal final_messages
|
| 497 |
+
try:
|
| 498 |
+
for round_num in range(MAX_TOOL_ROUNDS + 1):
|
| 499 |
+
kwargs = {"model": requested_model, "messages": final_messages, "stream": True}
|
| 500 |
+
if is_agentic:
|
| 501 |
+
kwargs["tools"] = TOOLS
|
| 502 |
+
kwargs["tool_choice"] = "auto"
|
| 503 |
+
|
| 504 |
+
# Collect streamed response
|
| 505 |
+
full_content = ""
|
| 506 |
+
tool_calls_raw = {} # index -> {id, name, arguments_str}
|
| 507 |
+
|
| 508 |
+
async for chunk in await nim_client.chat.completions.create(**kwargs):
|
| 509 |
+
choice = chunk.choices[0] if chunk.choices else None
|
| 510 |
+
if not choice:
|
| 511 |
+
continue
|
| 512 |
+
delta = choice.delta
|
| 513 |
+
|
| 514 |
+
# Stream text content to client
|
| 515 |
+
if delta and delta.content:
|
| 516 |
+
full_content += delta.content
|
| 517 |
+
yield make_chunk(request_id, requested_model, delta.content)
|
| 518 |
+
|
| 519 |
+
# Collect tool calls
|
| 520 |
+
if delta and delta.tool_calls:
|
| 521 |
+
for tc in delta.tool_calls:
|
| 522 |
+
idx = tc.index
|
| 523 |
+
if idx not in tool_calls_raw:
|
| 524 |
+
tool_calls_raw[idx] = {
|
| 525 |
+
"id": tc.id or f"call_{uuid.uuid4().hex[:8]}",
|
| 526 |
+
"name": tc.function.name if tc.function and tc.function.name else "",
|
| 527 |
+
"arguments": ""
|
| 528 |
+
}
|
| 529 |
+
if tc.function and tc.function.name:
|
| 530 |
+
tool_calls_raw[idx]["name"] = tc.function.name
|
| 531 |
+
if tc.id:
|
| 532 |
+
tool_calls_raw[idx]["id"] = tc.id
|
| 533 |
+
if tc.function and tc.function.arguments:
|
| 534 |
+
tool_calls_raw[idx]["arguments"] += tc.function.arguments
|
| 535 |
+
|
| 536 |
+
# Check for finish
|
| 537 |
+
if choice.finish_reason == "stop":
|
| 538 |
+
break
|
| 539 |
+
if choice.finish_reason == "tool_calls":
|
| 540 |
+
break
|
| 541 |
+
|
| 542 |
+
# If no tool calls, we're done
|
| 543 |
+
if not tool_calls_raw:
|
| 544 |
+
await save_message(session_id, "assistant", full_content)
|
| 545 |
+
yield make_chunk(request_id, requested_model, finish_reason="stop")
|
| 546 |
+
yield "data: [DONE]\n\n"
|
| 547 |
+
return
|
| 548 |
+
|
| 549 |
+
# Execute tool calls
|
| 550 |
+
tool_calls_list = []
|
| 551 |
+
for idx in sorted(tool_calls_raw.keys()):
|
| 552 |
+
tc = tool_calls_raw[idx]
|
| 553 |
+
tool_calls_list.append({
|
| 554 |
+
"id": tc["id"],
|
| 555 |
+
"type": "function",
|
| 556 |
+
"function": {"name": tc["name"], "arguments": tc["arguments"]}
|
| 557 |
+
})
|
| 558 |
+
|
| 559 |
+
# Add assistant message with tool calls to history
|
| 560 |
+
assistant_msg = {"role": "assistant", "content": full_content or None, "tool_calls": tool_calls_list}
|
| 561 |
+
final_messages.append(assistant_msg)
|
| 562 |
+
|
| 563 |
+
# Execute each tool and add results
|
| 564 |
+
for tc in tool_calls_list:
|
| 565 |
+
func_name = tc["function"]["name"]
|
| 566 |
+
try:
|
| 567 |
+
func_args = json.loads(tc["function"]["arguments"])
|
| 568 |
+
except json.JSONDecodeError:
|
| 569 |
+
func_args = {}
|
| 570 |
+
|
| 571 |
+
# Show tool execution to user
|
| 572 |
+
yield make_chunk(request_id, requested_model, f"\n\n🔧 **{func_name}**")
|
| 573 |
+
if func_name == "run_bash" and "command" in func_args:
|
| 574 |
+
yield make_chunk(request_id, requested_model, f": `{func_args['command']}`\n")
|
| 575 |
+
elif func_name == "read_file" and "path" in func_args:
|
| 576 |
+
yield make_chunk(request_id, requested_model, f": `{func_args['path']}`\n")
|
| 577 |
+
elif func_name == "write_file" and "path" in func_args:
|
| 578 |
+
yield make_chunk(request_id, requested_model, f": `{func_args['path']}`\n")
|
| 579 |
+
elif func_name == "list_directory":
|
| 580 |
+
yield make_chunk(request_id, requested_model, f": `{func_args.get('path', '.')}`\n")
|
| 581 |
+
elif func_name == "grep_search":
|
| 582 |
+
yield make_chunk(request_id, requested_model, f": `{func_args.get('pattern', '')}`\n")
|
| 583 |
+
else:
|
| 584 |
+
yield make_chunk(request_id, requested_model, "\n")
|
| 585 |
+
|
| 586 |
+
# Execute the tool
|
| 587 |
+
result = execute_tool(func_name, func_args)
|
| 588 |
+
|
| 589 |
+
# Show truncated result to user
|
| 590 |
+
preview = result[:500] + ("..." if len(result) > 500 else "")
|
| 591 |
+
yield make_chunk(request_id, requested_model, f"```\n{preview}\n```\n")
|
| 592 |
+
|
| 593 |
+
# Add tool result to message history
|
| 594 |
+
final_messages.append({
|
| 595 |
+
"role": "tool",
|
| 596 |
+
"tool_call_id": tc["id"],
|
| 597 |
+
"content": result,
|
| 598 |
+
})
|
| 599 |
+
|
| 600 |
+
await save_message(session_id, "tool", result, tool_call_id=tc["id"])
|
| 601 |
+
|
| 602 |
+
# Continue the agentic loop (model processes tool results)
|
| 603 |
+
|
| 604 |
+
# If we hit max rounds, finish
|
| 605 |
+
yield make_chunk(request_id, requested_model, "\n\n⚠️ Reached maximum tool call rounds.")
|
| 606 |
+
yield make_chunk(request_id, requested_model, finish_reason="stop")
|
| 607 |
+
yield "data: [DONE]\n\n"
|
| 608 |
+
|
| 609 |
+
except Exception as e:
|
| 610 |
+
error_msg = f"\n\n❌ Error: {str(e)}"
|
| 611 |
+
yield make_chunk(request_id, requested_model, error_msg)
|
| 612 |
+
yield make_chunk(request_id, requested_model, finish_reason="stop")
|
| 613 |
+
yield "data: [DONE]\n\n"
|
| 614 |
+
|
| 615 |
+
return StreamingResponse(
|
| 616 |
+
generate(),
|
| 617 |
+
media_type="text/event-stream",
|
| 618 |
+
headers={
|
| 619 |
+
"Cache-Control": "no-cache",
|
| 620 |
+
"X-Accel-Buffering": "no",
|
| 621 |
+
"Connection": "keep-alive",
|
| 622 |
+
},
|
| 623 |
+
)
|
| 624 |
+
|
| 625 |
+
|
| 626 |
+
# ---------------------------------------------------------------------------
|
| 627 |
+
# /v1/models — Model listing
|
| 628 |
+
# ---------------------------------------------------------------------------
|
| 629 |
+
|
| 630 |
+
@app.get("/v1/models")
|
| 631 |
+
async def list_models(authorization: str = Header(None)):
|
| 632 |
+
auth(authorization)
|
| 633 |
+
models = []
|
| 634 |
+
for model_id, display_name in ALL_MODELS.items():
|
| 635 |
+
models.append({
|
| 636 |
+
"id": model_id,
|
| 637 |
+
"object": "model",
|
| 638 |
+
"created": 1700000000,
|
| 639 |
+
"owned_by": "nvidia-nim",
|
| 640 |
+
"permission": [],
|
| 641 |
+
"root": model_id,
|
| 642 |
+
"parent": None,
|
| 643 |
+
})
|
| 644 |
+
return {"object": "list", "data": models}
|
| 645 |
+
|
| 646 |
+
|
| 647 |
+
# ---------------------------------------------------------------------------
|
| 648 |
+
# /health — Health check
|
| 649 |
+
# ---------------------------------------------------------------------------
|
| 650 |
+
|
| 651 |
+
@app.get("/health")
|
| 652 |
+
async def health():
|
| 653 |
+
return {
|
| 654 |
+
"status": "ok",
|
| 655 |
+
"workspace": WORKSPACE_DIR,
|
| 656 |
+
"workspace_exists": Path(WORKSPACE_DIR).exists(),
|
| 657 |
+
"db_connected": db_pool is not None,
|
| 658 |
+
"models_count": len(ALL_MODELS),
|
| 659 |
+
}
|
| 660 |
+
|
| 661 |
+
|
| 662 |
+
# ---------------------------------------------------------------------------
|
| 663 |
+
# Entrypoint
|
| 664 |
+
# ---------------------------------------------------------------------------
|
| 665 |
+
|
| 666 |
+
if __name__ == "__main__":
|
| 667 |
+
import uvicorn
|
| 668 |
+
uvicorn.run(app, host="0.0.0.0", port=7860)
|
requirements.txt
ADDED
|
@@ -0,0 +1,5 @@
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 1 |
+
fastapi==0.115.12
|
| 2 |
+
uvicorn[standard]==0.34.2
|
| 3 |
+
openai==1.86.0
|
| 4 |
+
asyncpg==0.30.0
|
| 5 |
+
anyio==4.9.0
|