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useSSHSession.ts
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/**
* REPL integration hook for `claude ssh` sessions.
*
* Sibling to useDirectConnect — same shape (isRemoteMode/sendMessage/
* cancelRequest/disconnect), same REPL wiring, but drives an SSH child
* process instead of a WebSocket. Kept separate rather than generalizing
* useDirectConnect because the lifecycle differs: the ssh process and auth
* proxy are created BEFORE this hook runs (during startup, in main.tsx) and
* handed in; useDirectConnect creates its WebSocket inside the effect.
*/
import { randomUUID } from 'crypto'
import { useCallback, useEffect, useMemo, useRef } from 'react'
import type { ToolUseConfirm } from '../components/permissions/PermissionRequest.js'
import {
createSyntheticAssistantMessage,
createToolStub,
} from '../remote/remotePermissionBridge.js'
import {
convertSDKMessage,
isSessionEndMessage,
} from '../remote/sdkMessageAdapter.js'
import type { SSHSession } from '../ssh/createSSHSession.js'
import type { SSHSessionManager } from '../ssh/SSHSessionManager.js'
import type { Tool } from '../Tool.js'
import { findToolByName } from '../Tool.js'
import type { Message as MessageType } from '../types/message.js'
import type { PermissionAskDecision } from '../types/permissions.js'
import { logForDebugging } from '../utils/debug.js'
import { gracefulShutdown } from '../utils/gracefulShutdown.js'
import type { RemoteMessageContent } from '../utils/teleport/api.js'
type UseSSHSessionResult = {
isRemoteMode: boolean
sendMessage: (content: RemoteMessageContent) => Promise<boolean>
cancelRequest: () => void
disconnect: () => void
}
type UseSSHSessionProps = {
session: SSHSession | undefined
setMessages: React.Dispatch<React.SetStateAction<MessageType[]>>
setIsLoading: (loading: boolean) => void
setToolUseConfirmQueue: React.Dispatch<React.SetStateAction<ToolUseConfirm[]>>
tools: Tool[]
}
export function useSSHSession({
session,
setMessages,
setIsLoading,
setToolUseConfirmQueue,
tools,
}: UseSSHSessionProps): UseSSHSessionResult {
const isRemoteMode = !!session
const managerRef = useRef<SSHSessionManager | null>(null)
const hasReceivedInitRef = useRef(false)
const isConnectedRef = useRef(false)
const toolsRef = useRef(tools)
useEffect(() => {
toolsRef.current = tools
}, [tools])
useEffect(() => {
if (!session) return
hasReceivedInitRef.current = false
logForDebugging('[useSSHSession] wiring SSH session manager')
const manager = session.createManager({
onMessage: sdkMessage => {
if (isSessionEndMessage(sdkMessage)) {
setIsLoading(false)
}
// Skip duplicate init messages (one per turn from stream-json mode).
if (sdkMessage.type === 'system' && sdkMessage.subtype === 'init') {
if (hasReceivedInitRef.current) return
hasReceivedInitRef.current = true
}
const converted = convertSDKMessage(sdkMessage, {
convertToolResults: true,
})
if (converted.type === 'message') {
setMessages(prev => [...prev, converted.message])
}
},
onPermissionRequest: (request, requestId) => {
logForDebugging(
`[useSSHSession] permission request: ${request.tool_name}`,
)
const tool =
findToolByName(toolsRef.current, request.tool_name) ??
createToolStub(request.tool_name)
const syntheticMessage = createSyntheticAssistantMessage(
request,
requestId,
)
const permissionResult: PermissionAskDecision = {
behavior: 'ask',
message:
request.description ?? `${request.tool_name} requires permission`,
suggestions: request.permission_suggestions,
blockedPath: request.blocked_path,
}
const toolUseConfirm: ToolUseConfirm = {
assistantMessage: syntheticMessage,
tool,
description:
request.description ?? `${request.tool_name} requires permission`,
input: request.input,
toolUseContext: {} as ToolUseConfirm['toolUseContext'],
toolUseID: request.tool_use_id,
permissionResult,
permissionPromptStartTimeMs: Date.now(),
onUserInteraction() {},
onAbort() {
manager.respondToPermissionRequest(requestId, {
behavior: 'deny',
message: 'User aborted',
})
setToolUseConfirmQueue(q =>
q.filter(i => i.toolUseID !== request.tool_use_id),
)
},
onAllow(updatedInput) {
manager.respondToPermissionRequest(requestId, {
behavior: 'allow',
updatedInput,
})
setToolUseConfirmQueue(q =>
q.filter(i => i.toolUseID !== request.tool_use_id),
)
setIsLoading(true)
},
onReject(feedback) {
manager.respondToPermissionRequest(requestId, {
behavior: 'deny',
message: feedback ?? 'User denied permission',
})
setToolUseConfirmQueue(q =>
q.filter(i => i.toolUseID !== request.tool_use_id),
)
},
async recheckPermission() {},
}
setToolUseConfirmQueue(q => [...q, toolUseConfirm])
setIsLoading(false)
},
onConnected: () => {
logForDebugging('[useSSHSession] connected')
isConnectedRef.current = true
},
onReconnecting: (attempt, max) => {
logForDebugging(
`[useSSHSession] ssh dropped, reconnecting (${attempt}/${max})`,
)
isConnectedRef.current = false
// Surface a transient system message in the transcript so the user
// knows what's happening — the next onConnected clears the state.
// Any in-flight request is lost; the remote's --continue reloads
// history but there's no turn in progress to resume.
setIsLoading(false)
const msg: MessageType = {
type: 'system',
subtype: 'informational',
content: `SSH connection dropped — reconnecting (attempt ${attempt}/${max})...`,
timestamp: new Date().toISOString(),
uuid: randomUUID(),
level: 'warning',
}
setMessages(prev => [...prev, msg])
},
onDisconnected: () => {
logForDebugging('[useSSHSession] ssh process exited (giving up)')
const stderr = session.getStderrTail().trim()
const connected = isConnectedRef.current
const exitCode = session.proc.exitCode
isConnectedRef.current = false
setIsLoading(false)
let msg = connected
? 'Remote session ended.'
: 'SSH session failed before connecting.'
// Surface remote stderr if it looks like an error (pre-connect always,
// post-connect only on nonzero exit — normal --verbose noise otherwise).
if (stderr && (!connected || exitCode !== 0)) {
msg += `\nRemote stderr (exit ${exitCode ?? 'signal ' + session.proc.signalCode}):\n${stderr}`
}
void gracefulShutdown(1, 'other', { finalMessage: msg })
},
onError: error => {
logForDebugging(`[useSSHSession] error: ${error.message}`)
},
})
managerRef.current = manager
manager.connect()
return () => {
logForDebugging('[useSSHSession] cleanup')
manager.disconnect()
session.proxy.stop()
managerRef.current = null
}
}, [session, setMessages, setIsLoading, setToolUseConfirmQueue])
const sendMessage = useCallback(
async (content: RemoteMessageContent): Promise<boolean> => {
const m = managerRef.current
if (!m) return false
setIsLoading(true)
return m.sendMessage(content)
},
[setIsLoading],
)
const cancelRequest = useCallback(() => {
managerRef.current?.sendInterrupt()
setIsLoading(false)
}, [setIsLoading])
const disconnect = useCallback(() => {
managerRef.current?.disconnect()
managerRef.current = null
isConnectedRef.current = false
}, [])
return useMemo(
() => ({ isRemoteMode, sendMessage, cancelRequest, disconnect }),
[isRemoteMode, sendMessage, cancelRequest, disconnect],
)
}