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g1t/services/models/src/route.ts

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Pick any line to see why it is the way it is: the commit, the pull request and issue it came from, and what the agent was thinking.

Integrations: your own model provider, alerts that open issues, tickets agents read1import type { ModelUpstream } from "@g1t/contracts";
2
3/** g1t's own way to the models, for runs it pays for. */
4export type HostedRouting = {
5 /** A Cloudflare AI Gateway id; empty sends requests to Anthropic directly. */
6 AI_GATEWAY_ID: string;
7 CLOUDFLARE_ACCOUNT_ID: string;
8 /** Authenticates to the gateway, which holds g1t's key. */
9 AI_GATEWAY_TOKEN?: string;
10 /** g1t's key, when the gateway does not hold it. */
11 ANTHROPIC_API_KEY?: string;
12};
13
14/** Headers the sandbox sends that never go further. */
15const DROPPED = new Set([
16 "x-api-key",
17 "authorization",
18 "host",
19 "cf-aig-authorization",
20 "cf-aig-metadata",
21 "cf-connecting-ip",
22 "x-forwarded-for",
23 "x-real-ip",
24]);
25
26/** The token a sandbox sends instead of a key, from either header. */
27export function presentedToken(headers: Headers): string | null {
28 const key = headers.get("x-api-key");
29 if (key) return key.trim();
30 const bearer = headers.get("authorization")?.match(/^Bearer\s+(.+)$/i);
31 return bearer ? bearer[1].trim() : null;
32}
33
34/**
Merge the AI Gateway: Anthropic's Messages API on a workspace's tokens35 * The caller's headers, less its token and anything that never goes
36 * further. Every `cf-aig-` header is the proxy's to set: one from a caller
37 * could change how Cloudflare's AI Gateway logs, caches or prices a
38 * request (`cf-aig-custom-cost`), which billing settles by.
39 */
40export function passedHeaders(incoming: Headers): Headers {
41 const headers = new Headers();
42 for (const [name, value] of incoming) {
43 const lower = name.toLowerCase();
44 if (!DROPPED.has(lower) && !lower.startsWith("cf-aig-")) headers.set(name, value);
45 }
46 return headers;
47}
48
49/**
Integrations: your own model provider, alerts that open issues, tickets agents read50 * Where one request goes and what it carries: the sandbox's request,
51 * stripped of its token, with the credentials for the run's route.
52 * `path` is what follows `/anthropic`, such as `/v1/messages?beta=true`.
53 */
54export function upstreamRequest(
55 upstream: ModelUpstream,
56 hosted: HostedRouting,
57 path: string,
58 incoming: Headers,
59): { url: string; headers: Headers } {
Merge the AI Gateway: Anthropic's Messages API on a workspace's tokens60 const headers = passedHeaders(incoming);
Integrations: your own model provider, alerts that open issues, tickets agents read61 if (upstream.route === "g1t") {
62 if (!hosted.AI_GATEWAY_ID) {
63 if (hosted.ANTHROPIC_API_KEY) headers.set("x-api-key", hosted.ANTHROPIC_API_KEY);
64 return { url: `https://api.anthropic.com${path}`, headers };
65 }
66 // The gateway logs these with every request, so spend and failures can
Auto model routing: the cheapest tier that can do each piece of work, a retry goes up a tier, and each run records its tier67 // be read per kind of work, tier, repository and pull request. It keeps
68 // five entries and drops the rest, so the tier takes the workspace's
69 // place: the repository names the workspace too. A run from before
70 // routing by tier has no tier, and keeps the workspace.
Integrations: your own model provider, alerts that open issues, tickets agents read71 headers.set(
72 "cf-aig-metadata",
Prices keep themselves current with what g1t pays73 JSON.stringify({
74 task: upstream.task,
Auto model routing: the cheapest tier that can do each piece of work, a retry goes up a tier, and each run records its tier75 ...(upstream.tier ? { tier: upstream.tier } : { workspace: upstream.workspace }),
Prices keep themselves current with what g1t pays76 repo: upstream.repo,
77 pull: upstream.number,
78 // What billing finds the run's requests by, to charge what they cost.
79 session: upstream.session,
80 }),
Integrations: your own model provider, alerts that open issues, tickets agents read81 );
82 if (hosted.AI_GATEWAY_TOKEN) headers.set("cf-aig-authorization", `Bearer ${hosted.AI_GATEWAY_TOKEN}`);
83 if (hosted.ANTHROPIC_API_KEY) headers.set("x-api-key", hosted.ANTHROPIC_API_KEY);
84 return {
85 url: `https://gateway.ai.cloudflare.com/v1/${hosted.CLOUDFLARE_ACCOUNT_ID}/${hosted.AI_GATEWAY_ID}/anthropic${path}`,
86 headers,
87 };
88 }
89 const key = upstream.apiKey;
90 if (key) {
A catalogue of model providers, and settings that feel like settings91 const header = upstream.authHeader ?? "x-api-key";
92 headers.set(header, header === "authorization" ? `Bearer ${key}` : key);
Integrations: your own model provider, alerts that open issues, tickets agents read93 }
Model providers: gateway tokens for endpoints, tidier rows, and the docs94 if (upstream.gatewayToken) headers.set("cf-aig-authorization", `Bearer ${upstream.gatewayToken}`);
Integrations: your own model provider, alerts that open issues, tickets agents read95 const base = (upstream.baseUrl ?? "https://api.anthropic.com").replace(/\/+$/, "");
96 return { url: `${base}${path}`, headers };
97}

This file's history is long; its oldest lines are credited to the oldest commit read.