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
| from fastapi import FastAPI, HTTPException, Request
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import StreamingResponse
import logging
import time
from typing import AsyncGenerator
from models import (
ChatCompletionRequest,
ChatCompletionResponse,
ChatCompletionStreamResponse,
StreamChoice,
Delta
)
app = FastAPI(
title="OpenAI Compatible API",
description="OpenAI 格式兼容的 API 服务",
version="1.0.0"
)
app.add_middleware(
CORSMiddleware,
allow_origins=["*"],
allow_credentials=True,
allow_methods=["*"],
allow_headers=["*"],
)
@app.get("/")
async def root():
"""根路径"""
return {
"message": "OpenAI Compatible API Server",
"version": "1.0.0",
"endpoints": {
"chat": "/v1/chat/completions",
"models": "/v1/models",
"health": "/health"
}
}
@app.get("/health")
async def health_check():
"""健康检查"""
return {"status": "healthy", "timestamp": int(time.time())}
@app.post("/v1/chat/completions")
async def create_chat_completion(request: ChatCompletionRequest, http_request: Request):
"""创建聊天完成"""
auth_header = http_request.headers.get("Authorization")
if not auth_header or not auth_header.startswith("Bearer "):
raise HTTPException(
status_code=401,
detail={
"error": {
"message": "Invalid API key provided",
"type": "invalid_request_error",
"code": "invalid_api_key"
}
}
)
api_key = auth_header[7:]
try:
if request.stream:
return StreamingResponse(
generate_stream_response(request, api_key),
media_type="text/event-stream",
headers={
"Cache-Control": "no-cache",
"Connection": "keep-alive",
"Content-Type": "text/event-stream"
}
)
else:
response = await generate_completion(request, api_key)
return response
except Exception as e:
raise HTTPException(
status_code=500,
detail={
"error": {
"message": str(e),
"type": "server_error",
"code": "internal_error"
}
}
)
async def generate_completion(request: ChatCompletionRequest, api_key: str) -> ChatCompletionResponse:
"""生成非流式完成响应"""
response_id = f"chatcmpl-{int(time.time())}"
return ChatCompletionResponse(
id=response_id,
created=int(time.time()),
model=request.model,
choices=[
Choice(
index=0,
message=Message(
role="assistant",
content="这是一个示例响应"
),
finish_reason="stop"
)
],
usage=Usage(
prompt_tokens=10,
completion_tokens=5,
total_tokens=15
)
)
async def generate_stream_response(request: ChatCompletionRequest, api_key: str) -> AsyncGenerator[str, None]:
"""生成流式响应"""
response_id = f"chatcmpl-{int(time.time())}"
created = int(time.time())
try:
content_chunks = ["这是", "一个", "流式", "响应", "示例"]
for chunk in content_chunks:
stream_response = ChatCompletionStreamResponse(
id=response_id,
created=created,
model=request.model,
choices=[
StreamChoice(
index=0,
delta=Delta(content=chunk),
finish_reason=None
)
]
)
yield f"data: {stream_response.model_dump_json()}\n\n"
import asyncio
await asyncio.sleep(0.1)
final_response = ChatCompletionStreamResponse(
id=response_id,
created=created,
model=request.model,
choices=[
StreamChoice(
index=0,
delta=Delta(),
finish_reason="stop"
)
]
)
yield f"data: {final_response.model_dump_json()}\n\n"
yield "data: [DONE]\n\n"
except Exception as e:
error_response = {
"error": {
"message": str(e),
"type": "server_error",
"code": "internal_error"
}
}
yield f"data: {json.dumps(error_response)}\n\n"
yield "data: [DONE]\n\n"
@app.get("/v1/models")
async def list_models():
"""获取模型列表"""
return {
"object": "list",
"data": [
{
"id": "gpt-3.5-turbo",
"object": "model",
"created": 1677610602,
"owned_by": "openai"
},
{
"id": "gpt-4",
"object": "model",
"created": 1687882411,
"owned_by": "openai"
}
]
}
|
微信
