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feat(mcp): supply a rotating signer credential to the gateway #40

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feat(mcp): supply a rotating signer credential to the gateway #40

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43 changes: 19 additions & 24 deletions lib/mcp/gateway.ts
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Original file line number Diff line number Diff line change
@@ -1,8 +1,7 @@
import {
createGateway,
SignerRefreshRequired,
type InferenceRequest,
type InferenceResult
type InferenceResult,
} from "@pymthouse/gateway-web";
import { pymthouseSignerUrl } from "./env";
import type { McpPrincipal } from "./jwt";
Expand All @@ -12,28 +11,24 @@ export async function runInference(
principal: McpPrincipal,
request: InferenceRequest
): Promise<InferenceResult> {
let session = await resolveSignerSession(principal);
const session = await resolveSignerSession(principal);
const timeoutMs = request.timeoutMs ?? request.timeout ?? 120_000;
let seeded: typeof session | null = session;

const attempt = async (signerJwt: string) => {
const gw = createGateway({
signerUrl: session.signer_url || pymthouseSignerUrl(),
signerHeaders: { Authorization: `Bearer ${signerJwt}` },
discoveryUrl: session.discovery_url,
insecureTls: true,
timeoutMs,
attributionSource: "pymthouse_gateway"
});
return gw.runInference(request);
};

try {
return await attempt(session.access_token);
} catch (err) {
if (err instanceof SignerRefreshRequired) {
session = await resolveSignerSession(principal);
return attempt(session.access_token);
}
throw err;
}
const gw = createGateway({
signerUrl: session.signer_url || pymthouseSignerUrl(),
discoveryUrl: session.discovery_url,
signerHeaders: async () => {
const next = seeded ?? (await resolveSignerSession(principal));
seeded = null;
return {
headers: { Authorization: `Bearer ${next.access_token}` },
expiresInSeconds: next.expires_in,
};
},
insecureTls: true,
timeoutMs,
attributionSource: "pymthouse_gateway",
});
return gw.runInference(request);
}
2 changes: 1 addition & 1 deletion package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@
"@auth0/nextjs-auth0": "^4.27.0",
"@modelcontextprotocol/sdk": "^1.30.0",
"@pymthouse/builder-sdk": "^0.6.5",
"@pymthouse/gateway-web": "^0.3.0",
"@pymthouse/gateway-web": "^0.4.0",
"framer-motion": "^11.15.0",
"geist": "^1.7.0",
"jose": "^6.2.10",
Expand Down