File size: 9,130 Bytes
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import { Headers } from "effect/unstable/http"
import { LLMError, TransportReason } from "../../schema"
import * as HttpTransport from "./http"
import type { Transport } from "./index"
export interface WebSocketRequest {
readonly url: string
readonly headers: Headers.Headers
}
export interface WebSocketConnection {
readonly sendText: (message: string) => Effect.Effect<void, LLMError>
readonly messages: Stream.Stream<string | Uint8Array, LLMError>
readonly close: Effect.Effect<void, never>
}
export interface Interface {
readonly open: (input: WebSocketRequest) => Effect.Effect<WebSocketConnection, LLMError>
}
type WebSocketConstructorWithHeaders = new (
url: string,
options?: { readonly headers?: Headers.Headers },
) => globalThis.WebSocket
export class Service extends Context.Service<Service, Interface>()("@opencode/LLM/WebSocketExecutor") {}
const transportError = (
method: string,
message: string,
input: { readonly url?: string; readonly kind?: string } = {},
) =>
new LLMError({
module: "WebSocketExecutor",
method,
reason: new TransportReason({ message, url: input.url, kind: input.kind }),
})
const eventMessage = (event: Event) => {
if ("message" in event && typeof event.message === "string") return event.message
return event.type
}
const binaryMessage = (data: unknown) => {
if (data instanceof Uint8Array) return data
if (data instanceof ArrayBuffer) return new Uint8Array(data)
if (ArrayBuffer.isView(data)) return new Uint8Array(data.buffer, data.byteOffset, data.byteLength)
return undefined
}
const waitOpen = (ws: globalThis.WebSocket, input: WebSocketRequest) => {
if (ws.readyState === globalThis.WebSocket.OPEN) return Effect.void
if (ws.readyState === globalThis.WebSocket.CLOSING || ws.readyState === globalThis.WebSocket.CLOSED) {
return Effect.fail(
transportError("open", `WebSocket closed before opening (state ${ws.readyState})`, {
url: input.url,
kind: "open",
}),
)
}
return Effect.callback<void, LLMError>((resume, signal) => {
const cleanup = () => {
ws.removeEventListener("open", onOpen)
ws.removeEventListener("error", onError)
ws.removeEventListener("close", onClose)
signal.removeEventListener("abort", onAbort)
}
const onAbort = () => {
cleanup()
if (ws.readyState !== globalThis.WebSocket.CLOSED && ws.readyState !== globalThis.WebSocket.CLOSING)
ws.close(1000)
}
const onOpen = () => {
cleanup()
resume(Effect.void)
}
const onError = (event: Event) => {
cleanup()
resume(
Effect.fail(
transportError("open", `Failed to open WebSocket: ${eventMessage(event)}`, { url: input.url, kind: "open" }),
),
)
}
const onClose = (event: CloseEvent) => {
cleanup()
resume(
Effect.fail(
transportError("open", `WebSocket closed before opening with code ${event.code}`, {
url: input.url,
kind: "open",
}),
),
)
}
ws.addEventListener("open", onOpen, { once: true })
ws.addEventListener("error", onError, { once: true })
ws.addEventListener("close", onClose, { once: true })
signal.addEventListener("abort", onAbort, { once: true })
})
}
const webSocketUrl = (value: string) =>
Effect.try({
try: () => {
const url = new URL(value)
if (url.protocol === "https:") {
url.protocol = "wss:"
return url.toString()
}
if (url.protocol === "http:") {
url.protocol = "ws:"
return url.toString()
}
throw new Error(`Unsupported WebSocket URL protocol ${url.protocol}`)
},
catch: (error) =>
transportError("prepare", error instanceof Error ? error.message : "Invalid WebSocket URL", {
url: value,
kind: "websocket",
}),
})
export const open = (input: WebSocketRequest) =>
Effect.try({
try: () =>
new (globalThis.WebSocket as unknown as WebSocketConstructorWithHeaders)(input.url, { headers: input.headers }),
catch: (error) =>
transportError("open", error instanceof Error ? error.message : "Failed to construct WebSocket", {
url: input.url,
kind: "open",
}),
}).pipe(Effect.flatMap((ws) => fromWebSocket(ws, input)))
export const layer: Layer.Layer<Service> = Layer.succeed(Service, Service.of({ open }))
export const fromWebSocket = (
ws: globalThis.WebSocket,
input: WebSocketRequest,
): Effect.Effect<WebSocketConnection, LLMError> =>
Effect.gen(function* () {
yield* waitOpen(ws, input)
const messages = yield* Queue.bounded<string | Uint8Array, LLMError | Cause.Done<void>>(128)
const onMessage = (event: MessageEvent) => {
if (typeof event.data === "string") return Queue.offerUnsafe(messages, event.data)
const binary = binaryMessage(event.data)
if (binary) return Queue.offerUnsafe(messages, binary)
Queue.failCauseUnsafe(
messages,
Cause.fail(
transportError("message", "Unsupported WebSocket message payload", { url: input.url, kind: "message" }),
),
)
}
const onError = (event: Event) => {
Queue.failCauseUnsafe(
messages,
Cause.fail(
transportError("message", `WebSocket error: ${eventMessage(event)}`, { url: input.url, kind: "message" }),
),
)
}
const onClose = (event: CloseEvent) => {
if (event.code === 1000 || event.code === 1005) return Queue.endUnsafe(messages)
Queue.failCauseUnsafe(
messages,
Cause.fail(
transportError("message", `WebSocket closed with code ${event.code}`, { url: input.url, kind: "close" }),
),
)
}
const cleanup = Effect.sync(() => {
ws.removeEventListener("message", onMessage)
ws.removeEventListener("error", onError)
ws.removeEventListener("close", onClose)
}).pipe(Effect.andThen(Queue.shutdown(messages)))
ws.addEventListener("message", onMessage)
ws.addEventListener("error", onError)
ws.addEventListener("close", onClose)
return {
sendText: (message) =>
Effect.try({
try: () => ws.send(message),
catch: (error) =>
transportError("sendText", error instanceof Error ? error.message : "Failed to send WebSocket message", {
url: input.url,
kind: "write",
}),
}),
messages: Stream.fromQueue(messages),
close: cleanup.pipe(
Effect.andThen(
Effect.sync(() => {
if (ws.readyState === globalThis.WebSocket.CLOSED || ws.readyState === globalThis.WebSocket.CLOSING) return
ws.close(1000)
}),
),
),
}
})
export const messageText = (message: string | Uint8Array, decoder: TextDecoder) =>
typeof message === "string" ? message : decoder.decode(message)
export interface JsonPrepared {
readonly url: string
readonly headers: Headers.Headers
readonly message: string
}
export interface JsonInput<Body, Message> {
readonly toMessage: (body: Body | Record<string, unknown>) => Effect.Effect<Message, LLMError>
readonly encodeMessage: (message: Message) => string
}
export type JsonPatch<Body, Message> = Partial<JsonInput<Body, Message>>
export interface JsonTransport<Body, Message> extends Transport<Body, JsonPrepared, string> {
readonly with: (patch: JsonPatch<Body, Message>) => JsonTransport<Body, Message>
}
export const json = <Body, Message>(input: JsonInput<Body, Message>): JsonTransport<Body, Message> => ({
id: "websocket-json",
with: (patch) => json({ ...input, ...patch }),
prepare: (prepareInput) =>
Effect.gen(function* () {
const parts = yield* HttpTransport.jsonRequestParts({
...prepareInput,
})
return {
url: yield* webSocketUrl(parts.url),
headers: parts.headers,
message: input.encodeMessage(yield* input.toMessage(parts.jsonBody)),
}
}),
frames: (prepared, _request, runtime) => {
const webSocket = runtime.webSocket
if (!webSocket) {
return Stream.fail(
transportError("json", "WebSocket JSON transport requires WebSocketExecutor.Service", {
url: prepared.url,
kind: "websocket",
}),
)
}
const decoder = new TextDecoder()
return Stream.unwrap(
Effect.gen(function* () {
const connection = yield* Effect.acquireRelease(
webSocket.open({ url: prepared.url, headers: prepared.headers }),
(connection) => connection.close,
)
yield* connection.sendText(prepared.message)
return connection.messages.pipe(Stream.map((message) => messageText(message, decoder)))
}),
)
},
})
export const jsonTransport = {
id: "websocket-json",
with: json,
} as const
export const WebSocketExecutor = {
Service,
layer,
open,
fromWebSocket,
messageText,
} as const
export const WebSocketTransport = {
json,
jsonTransport,
} as const
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