graham.systems
+47
-8
packages/mcp/index.ts
+47
-8
packages/mcp/index.ts
···
22
22
const server = createServer();
23
23
24
24
if (!args.http) {
25
-
logger.info("starting in stdio server");
25
+
logger.info("starting in stdio mode");
26
26
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const transport = new StdioServerTransport();
28
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await server.connect(transport);
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29
} else {
30
-
logger.info("starting in streamable HTTP server");
30
+
logger.info("starting in streamable HTTP mode");
31
31
32
-
const transport = new StreamableHTTPServerTransport({
33
-
sessionIdGenerator: crypto.randomUUID,
34
-
});
32
+
const sessions: Map<string, StreamableHTTPServerTransport> = new Map();
35
33
36
34
Deno.serve(
37
35
{
···
42
40
},
43
41
onError(error) {
44
42
logger.error(
45
-
"unexpected route error: {error?.message}",
46
-
error as Record<string, unknown>,
43
+
"unexpected route error: {error}",
44
+
{ error },
47
45
);
48
46
49
47
return new Response(null, { status: 500 });
···
61
59
return new Response(null, { status: 404 });
62
60
}
63
61
62
+
const sessionId = request.headers.get("mcp-session-id");
63
+
let transport: StreamableHTTPServerTransport;
64
+
65
+
if (sessionId && sessions.has(sessionId)) {
66
+
logger.info("{method} resuming session {sessionId}", {
67
+
sessionId,
68
+
method: request.method,
69
+
});
70
+
71
+
transport = sessions.get(sessionId)!;
72
+
} else if (
73
+
request.method !== "POST" && !sessions.has(sessionId ?? "")
74
+
) {
75
+
logger.error("{method} has invalid session {sessionId}", {
76
+
sessionId,
77
+
method: request.method,
78
+
});
79
+
80
+
return Response.json({ error: "invalid or missing session" }, {
81
+
status: 401,
82
+
});
83
+
} else {
84
+
const sessionId = crypto.randomUUID();
85
+
86
+
logger.info("opening new session {sessionId}", { sessionId });
87
+
88
+
transport = new StreamableHTTPServerTransport({
89
+
sessionIdGenerator: () => sessionId as string,
90
+
});
91
+
92
+
transport.onclose = () => {
93
+
logger.info("session {sessionId} closed, cleaning up", {
94
+
sessionId,
95
+
});
96
+
sessions.delete(sessionId);
97
+
};
98
+
99
+
sessions.set(sessionId, transport);
100
+
101
+
await server.connect(transport);
102
+
}
103
+
64
104
const { req, res } = toReqRes(request);
65
105
66
-
await server.connect(transport);
67
106
await transport.handleRequest(req, res);
68
107
69
108
return await toFetchResponse(res);