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directConnectManager.ts
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213 lines (189 loc) · 5.76 KB
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/* eslint-disable eslint-plugin-n/no-unsupported-features/node-builtins */
import type { SDKMessage } from '../entrypoints/agentSdkTypes.js'
import type {
SDKControlPermissionRequest,
StdoutMessage,
} from '../entrypoints/sdk/controlTypes.js'
import type { RemotePermissionResponse } from '../remote/RemoteSessionManager.js'
import { logForDebugging } from '../utils/debug.js'
import { jsonParse, jsonStringify } from '../utils/slowOperations.js'
import type { RemoteMessageContent } from '../utils/teleport/api.js'
export type DirectConnectConfig = {
serverUrl: string
sessionId: string
wsUrl: string
authToken?: string
}
export type DirectConnectCallbacks = {
onMessage: (message: SDKMessage) => void
onPermissionRequest: (
request: SDKControlPermissionRequest,
requestId: string,
) => void
onConnected?: () => void
onDisconnected?: () => void
onError?: (error: Error) => void
}
function isStdoutMessage(value: unknown): value is StdoutMessage {
return (
typeof value === 'object' &&
value !== null &&
'type' in value &&
typeof value.type === 'string'
)
}
export class DirectConnectSessionManager {
private ws: WebSocket | null = null
private config: DirectConnectConfig
private callbacks: DirectConnectCallbacks
constructor(config: DirectConnectConfig, callbacks: DirectConnectCallbacks) {
this.config = config
this.callbacks = callbacks
}
connect(): void {
const headers: Record<string, string> = {}
if (this.config.authToken) {
headers['authorization'] = `Bearer ${this.config.authToken}`
}
// Bun's WebSocket supports headers option but the DOM typings don't
this.ws = new WebSocket(this.config.wsUrl, {
headers,
} as unknown as string[])
this.ws.addEventListener('open', () => {
this.callbacks.onConnected?.()
})
this.ws.addEventListener('message', event => {
const data = typeof event.data === 'string' ? event.data : ''
const lines = data.split('\n').filter((l: string) => l.trim())
for (const line of lines) {
let raw: unknown
try {
raw = jsonParse(line)
} catch {
continue
}
if (!isStdoutMessage(raw)) {
continue
}
const parsed = raw
// Handle control requests (permission requests)
if (parsed.type === 'control_request') {
if (parsed.request.subtype === 'can_use_tool') {
this.callbacks.onPermissionRequest(
parsed.request,
parsed.request_id,
)
} else {
// Send an error response for unrecognized subtypes so the
// server doesn't hang waiting for a reply that never comes.
logForDebugging(
`[DirectConnect] Unsupported control request subtype: ${parsed.request.subtype}`,
)
this.sendErrorResponse(
parsed.request_id,
`Unsupported control request subtype: ${parsed.request.subtype}`,
)
}
continue
}
// Forward SDK messages (assistant, result, system, etc.)
if (
parsed.type !== 'control_response' &&
parsed.type !== 'keep_alive' &&
parsed.type !== 'control_cancel_request' &&
parsed.type !== 'streamlined_text' &&
parsed.type !== 'streamlined_tool_use_summary' &&
!(parsed.type === 'system' && parsed.subtype === 'post_turn_summary')
) {
this.callbacks.onMessage(parsed)
}
}
})
this.ws.addEventListener('close', () => {
this.callbacks.onDisconnected?.()
})
this.ws.addEventListener('error', () => {
this.callbacks.onError?.(new Error('WebSocket connection error'))
})
}
sendMessage(content: RemoteMessageContent): boolean {
if (!this.ws || this.ws.readyState !== WebSocket.OPEN) {
return false
}
// Must match SDKUserMessage format expected by `--input-format stream-json`
const message = jsonStringify({
type: 'user',
message: {
role: 'user',
content: content,
},
parent_tool_use_id: null,
session_id: '',
})
this.ws.send(message)
return true
}
respondToPermissionRequest(
requestId: string,
result: RemotePermissionResponse,
): void {
if (!this.ws || this.ws.readyState !== WebSocket.OPEN) {
return
}
// Must match SDKControlResponse format expected by StructuredIO
const response = jsonStringify({
type: 'control_response',
response: {
subtype: 'success',
request_id: requestId,
response: {
behavior: result.behavior,
...(result.behavior === 'allow'
? { updatedInput: result.updatedInput }
: { message: result.message }),
},
},
})
this.ws.send(response)
}
/**
* Send an interrupt signal to cancel the current request
*/
sendInterrupt(): void {
if (!this.ws || this.ws.readyState !== WebSocket.OPEN) {
return
}
// Must match SDKControlRequest format expected by StructuredIO
const request = jsonStringify({
type: 'control_request',
request_id: crypto.randomUUID(),
request: {
subtype: 'interrupt',
},
})
this.ws.send(request)
}
private sendErrorResponse(requestId: string, error: string): void {
if (!this.ws || this.ws.readyState !== WebSocket.OPEN) {
return
}
const response = jsonStringify({
type: 'control_response',
response: {
subtype: 'error',
request_id: requestId,
error,
},
})
this.ws.send(response)
}
disconnect(): void {
if (this.ws) {
this.ws.close()
this.ws = null
}
}
isConnected(): boolean {
return this.ws?.readyState === WebSocket.OPEN
}
}