File size: 6,053 Bytes
fcd8223 | 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 | import {
buildCloudflareAccessHeaders,
type CloudflareAccessCredentials,
} from "../../packages/gateway-client/src/cloudflare-access.js";
import {
GatewayClient,
type GatewayClientCloseInfo,
type GatewayClientOptions,
type GatewayClientRequestOptions,
type GatewayReconnectPausedInfo,
} from "../gateway/client.js";
import type { ComputerUseCapabilityDescriptor } from "../plugins/computer-use-contract.js";
import type { NodeHostGatewayConfig } from "./config.js";
type GatewayCandidateEvent = Parameters<NonNullable<GatewayClientOptions["onEvent"]>>[0];
type GatewayCandidateHello = Parameters<NonNullable<GatewayClientOptions["onHelloOk"]>>[0];
type CandidateConnectionOptions = Omit<
GatewayClientOptions,
| "url"
| "tlsFingerprint"
| "edgeAuthHeaders"
| "onEvent"
| "onHelloOk"
| "onConnectError"
| "onReconnectPaused"
| "onClose"
>;
type GatewayCandidateConnectionParams = {
candidates: readonly NodeHostGatewayConfig[];
cloudflareAccessByCandidate?: ReadonlyMap<NodeHostGatewayConfig, CloudflareAccessCredentials>;
clientOptions: CandidateConnectionOptions;
onEvent: (event: GatewayCandidateEvent) => void;
onHelloOk: (
hello: GatewayCandidateHello,
url: string,
tlsFingerprint?: string,
cloudflareAccess?: CloudflareAccessCredentials,
) => void;
onConnectError: (error: Error) => void;
onReconnectPaused: (info: GatewayReconnectPausedInfo) => void;
onClose: (code: number, reason: string, info?: GatewayClientCloseInfo) => void;
onWinningCandidate: (candidate: NodeHostGatewayConfig) => void;
};
export function formatGatewayCandidateUrl(gateway: NodeHostGatewayConfig): string {
const host = gateway.host ?? "127.0.0.1";
const urlHost =
host.includes(":") && !(host.startsWith("[") && host.endsWith("]")) ? `[${host}]` : host;
const port = gateway.port ?? 18789;
const scheme = gateway.tls ? "wss" : "ws";
const contextPath = gateway.contextPath
? gateway.contextPath.startsWith("/")
? gateway.contextPath
: `/${gateway.contextPath}`
: "";
return `${scheme}://${urlHost}:${port}${contextPath}`;
}
function canTryNextGatewayCandidate(info: GatewayClientCloseInfo | undefined): boolean {
return info?.phase === "pre-hello" && info.connectRequestSent === false;
}
export function createNodeHostGatewayCandidateConnection(params: GatewayCandidateConnectionParams) {
if (params.candidates.length === 0) {
throw new Error("node host gateway candidate list cannot be empty");
}
let currentCandidateIndex = 0;
let stopped = false;
let winnerSelected = params.candidates.length === 1;
let latestManifest:
| { caps: string[]; commands: string[]; computerUse?: ComputerUseCapabilityDescriptor }
| undefined;
let currentClient = createCandidateClient(currentCandidateIndex);
function createCandidateClient(candidateIndex: number): GatewayClient {
const candidate = params.candidates[candidateIndex];
if (!candidate) {
throw new Error(`node host gateway candidate ${candidateIndex} is unavailable`);
}
const url = formatGatewayCandidateUrl(candidate);
const cloudflareAccess = params.cloudflareAccessByCandidate?.get(candidate);
const candidateClient = new GatewayClient({
...params.clientOptions,
url,
tlsFingerprint: candidate.tlsFingerprint,
...(cloudflareAccess
? { edgeAuthHeaders: buildCloudflareAccessHeaders(cloudflareAccess) }
: {}),
onEvent: (event) => {
if (currentCandidateIndex === candidateIndex) {
params.onEvent(event);
}
},
onHelloOk: (hello) => {
if (currentCandidateIndex !== candidateIndex) {
return;
}
if (!winnerSelected) {
winnerSelected = true;
params.onWinningCandidate(candidate);
}
params.onHelloOk(hello, url, candidate.tlsFingerprint, cloudflareAccess);
},
onConnectError: (error) => {
if (currentCandidateIndex === candidateIndex) {
params.onConnectError(error);
}
},
onReconnectPaused: (info) => {
if (currentCandidateIndex === candidateIndex) {
params.onReconnectPaused(info);
}
},
onClose: (code, reason, info) => {
if (currentCandidateIndex !== candidateIndex) {
return;
}
params.onClose(code, reason, info);
const nextCandidateIndex = candidateIndex + 1;
if (
stopped ||
// A successful hello redeems setup credentials and promotes this
// endpoint. Its own reconnect path owns durable device auth from here.
winnerSelected ||
nextCandidateIndex >= params.candidates.length ||
!canTryNextGatewayCandidate(info)
) {
return;
}
currentCandidateIndex = nextCandidateIndex;
candidateClient.stop();
queueMicrotask(() => {
if (stopped || currentCandidateIndex !== nextCandidateIndex) {
return;
}
currentClient = createCandidateClient(nextCandidateIndex);
currentClient.start();
});
},
});
if (latestManifest) {
candidateClient.updateNodeManifest(latestManifest);
}
return candidateClient;
}
return {
start(): void {
currentClient.start();
},
stop(): void {
stopped = true;
currentClient.stop();
},
request<T = Record<string, unknown>>(
...requestArgs: [method: string, params?: unknown, options?: GatewayClientRequestOptions]
): Promise<T> {
return currentClient.request<T>(...requestArgs);
},
updateNodeManifest(manifest: {
caps: string[];
commands: string[];
computerUse?: ComputerUseCapabilityDescriptor;
}): void {
// Availability may change before the first hello. Every later candidate
// must start with the newest manifest rather than the constructor snapshot.
latestManifest = manifest;
currentClient.updateNodeManifest(manifest);
},
};
}
|