init claude-code

2026-04-01 17:32:37 +02:00
commit 73b208c009
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+import axios, { type AxiosError } from 'axios'
+import type { StdoutMessage } from 'src/entrypoints/sdk/controlTypes.js'
+import { logForDebugging } from '../../utils/debug.js'
+import { logForDiagnosticsNoPII } from '../../utils/diagLogs.js'
+import { errorMessage } from '../../utils/errors.js'
+import { getSessionIngressAuthHeaders } from '../../utils/sessionIngressAuth.js'
+import { sleep } from '../../utils/sleep.js'
+import { jsonParse, jsonStringify } from '../../utils/slowOperations.js'
+import { getClaudeCodeUserAgent } from '../../utils/userAgent.js'
+import type { Transport } from './Transport.js'
+
+// ---------------------------------------------------------------------------
+// Configuration
+// ---------------------------------------------------------------------------
+
+const RECONNECT_BASE_DELAY_MS = 1000
+const RECONNECT_MAX_DELAY_MS = 30_000
+/** Time budget for reconnection attempts before giving up (10 minutes). */
+const RECONNECT_GIVE_UP_MS = 600_000
+/** Server sends keepalives every 15s; treat connection as dead after 45s of silence. */
+const LIVENESS_TIMEOUT_MS = 45_000
+
+/**
+ * HTTP status codes that indicate a permanent server-side rejection.
+ * The transport transitions to 'closed' immediately without retrying.
+ */
+const PERMANENT_HTTP_CODES = new Set([401, 403, 404])
+
+// POST retry configuration (matches HybridTransport)
+const POST_MAX_RETRIES = 10
+const POST_BASE_DELAY_MS = 500
+const POST_MAX_DELAY_MS = 8000
+
+/** Hoisted TextDecoder options to avoid per-chunk allocation in readStream. */
+const STREAM_DECODE_OPTS: TextDecodeOptions = { stream: true }
+
+/** Hoisted axios validateStatus callback to avoid per-request closure allocation. */
+function alwaysValidStatus(): boolean {
+  return true
+}
+
+// ---------------------------------------------------------------------------
+// SSE Frame Parser
+// ---------------------------------------------------------------------------
+
+type SSEFrame = {
+  event?: string
+  id?: string
+  data?: string
+}
+
+/**
+ * Incrementally parse SSE frames from a text buffer.
+ * Returns parsed frames and the remaining (incomplete) buffer.
+ *
+ * @internal exported for testing
+ */
+export function parseSSEFrames(buffer: string): {
+  frames: SSEFrame[]
+  remaining: string
+} {
+  const frames: SSEFrame[] = []
+  let pos = 0
+
+  // SSE frames are delimited by double newlines
+  let idx: number
+  while ((idx = buffer.indexOf('\n\n', pos)) !== -1) {
+    const rawFrame = buffer.slice(pos, idx)
+    pos = idx + 2
+
+    // Skip empty frames
+    if (!rawFrame.trim()) continue
+
+    const frame: SSEFrame = {}
+    let isComment = false
+
+    for (const line of rawFrame.split('\n')) {
+      if (line.startsWith(':')) {
+        // SSE comment (e.g., `:keepalive`)
+        isComment = true
+        continue
+      }
+
+      const colonIdx = line.indexOf(':')
+      if (colonIdx === -1) continue
+
+      const field = line.slice(0, colonIdx)
+      // Per SSE spec, strip one leading space after colon if present
+      const value =
+        line[colonIdx + 1] === ' '
+          ? line.slice(colonIdx + 2)
+          : line.slice(colonIdx + 1)
+
+      switch (field) {
+        case 'event':
+          frame.event = value
+          break
+        case 'id':
+          frame.id = value
+          break
+        case 'data':
+          // Per SSE spec, multiple data: lines are concatenated with \n
+          frame.data = frame.data ? frame.data + '\n' + value : value
+          break
+        // Ignore other fields (retry:, etc.)
+      }
+    }
+
+    // Only emit frames that have data (or are pure comments which reset liveness)
+    if (frame.data || isComment) {
+      frames.push(frame)
+    }
+  }
+
+  return { frames, remaining: buffer.slice(pos) }
+}
+
+// ---------------------------------------------------------------------------
+// Types
+// ---------------------------------------------------------------------------
+
+type SSETransportState =
+  | 'idle'
+  | 'connected'
+  | 'reconnecting'
+  | 'closing'
+  | 'closed'
+
+/**
+ * Payload for `event: client_event` frames, matching the StreamClientEvent
+ * proto message in session_stream.proto. This is the only event type sent
+ * to worker subscribers — delivery_update, session_update, ephemeral_event,
+ * and catch_up_truncated are client-channel-only (see notifier.go and
+ * event_stream.go SubscriberClient guard).
+ */
+export type StreamClientEvent = {
+  event_id: string
+  sequence_num: number
+  event_type: string
+  source: string
+  payload: Record<string, unknown>
+  created_at: string
+}
+
+// ---------------------------------------------------------------------------
+// SSETransport
+// ---------------------------------------------------------------------------
+
+/**
+ * Transport that uses SSE for reading and HTTP POST for writing.
+ *
+ * Reads events via Server-Sent Events from the CCR v2 event stream endpoint.
+ * Writes events via HTTP POST with retry logic (same pattern as HybridTransport).
+ *
+ * Each `event: client_event` frame carries a StreamClientEvent proto JSON
+ * directly in `data:`. The transport extracts `payload` and passes it to
+ * `onData` as newline-delimited JSON for StructuredIO consumers.
+ *
+ * Supports automatic reconnection with exponential backoff and Last-Event-ID
+ * for resumption after disconnection.
+ */
+export class SSETransport implements Transport {
+  private state: SSETransportState = 'idle'
+  private onData?: (data: string) => void
+  private onCloseCallback?: (closeCode?: number) => void
+  private onEventCallback?: (event: StreamClientEvent) => void
+  private headers: Record<string, string>
+  private sessionId?: string
+  private refreshHeaders?: () => Record<string, string>
+  private readonly getAuthHeaders: () => Record<string, string>
+
+  // SSE connection state
+  private abortController: AbortController | null = null
+  private lastSequenceNum = 0
+  private seenSequenceNums = new Set<number>()
+
+  // Reconnection state
+  private reconnectAttempts = 0
+  private reconnectStartTime: number | null = null
+  private reconnectTimer: NodeJS.Timeout | null = null
+
+  // Liveness detection
+  private livenessTimer: NodeJS.Timeout | null = null
+
+  // POST URL (derived from SSE URL)
+  private postUrl: string
+
+  // Runtime epoch for CCR v2 event format
+
+  constructor(
+    private readonly url: URL,
+    headers: Record<string, string> = {},
+    sessionId?: string,
+    refreshHeaders?: () => Record<string, string>,
+    initialSequenceNum?: number,
+    /**
+     * Per-instance auth header source. Omit to read the process-wide
+     * CLAUDE_CODE_SESSION_ACCESS_TOKEN (single-session callers). Required
+     * for concurrent multi-session callers — the env-var path is a process
+     * global and would stomp across sessions.
+     */
+    getAuthHeaders?: () => Record<string, string>,
+  ) {
+    this.headers = headers
+    this.sessionId = sessionId
+    this.refreshHeaders = refreshHeaders
+    this.getAuthHeaders = getAuthHeaders ?? getSessionIngressAuthHeaders
+    this.postUrl = convertSSEUrlToPostUrl(url)
+    // Seed with a caller-provided high-water mark so the first connect()
+    // sends from_sequence_num / Last-Event-ID. Without this, a fresh
+    // SSETransport always asks the server to replay from sequence 0 —
+    // the entire session history on every transport swap.
+    if (initialSequenceNum !== undefined && initialSequenceNum > 0) {
+      this.lastSequenceNum = initialSequenceNum
+    }
+    logForDebugging(`SSETransport: SSE URL = ${url.href}`)
+    logForDebugging(`SSETransport: POST URL = ${this.postUrl}`)
+    logForDiagnosticsNoPII('info', 'cli_sse_transport_initialized')
+  }
+
+  /**
+   * High-water mark of sequence numbers seen on this stream. Callers that
+   * recreate the transport (e.g. replBridge onWorkReceived) read this before
+   * close() and pass it as `initialSequenceNum` to the next instance so the
+   * server resumes from the right point instead of replaying everything.
+   */
+  getLastSequenceNum(): number {
+    return this.lastSequenceNum
+  }
+
+  async connect(): Promise<void> {
+    if (this.state !== 'idle' && this.state !== 'reconnecting') {
+      logForDebugging(
+        `SSETransport: Cannot connect, current state is ${this.state}`,
+        { level: 'error' },
+      )
+      logForDiagnosticsNoPII('error', 'cli_sse_connect_failed')
+      return
+    }
+
+    this.state = 'reconnecting'
+    const connectStartTime = Date.now()
+
+    // Build SSE URL with sequence number for resumption
+    const sseUrl = new URL(this.url.href)
+    if (this.lastSequenceNum > 0) {
+      sseUrl.searchParams.set('from_sequence_num', String(this.lastSequenceNum))
+    }
+
+    // Build headers -- use fresh auth headers (supports Cookie for session keys).
+    // Remove stale Authorization header from this.headers when Cookie auth is used,
+    // since sending both confuses the auth interceptor.
+    const authHeaders = this.getAuthHeaders()
+    const headers: Record<string, string> = {
+      ...this.headers,
+      ...authHeaders,
+      Accept: 'text/event-stream',
+      'anthropic-version': '2023-06-01',
+      'User-Agent': getClaudeCodeUserAgent(),
+    }
+    if (authHeaders['Cookie']) {
+      delete headers['Authorization']
+    }
+    if (this.lastSequenceNum > 0) {
+      headers['Last-Event-ID'] = String(this.lastSequenceNum)
+    }
+
+    logForDebugging(`SSETransport: Opening ${sseUrl.href}`)
+    logForDiagnosticsNoPII('info', 'cli_sse_connect_opening')
+
+    this.abortController = new AbortController()
+
+    try {
+      // eslint-disable-next-line eslint-plugin-n/no-unsupported-features/node-builtins
+      const response = await fetch(sseUrl.href, {
+        headers,
+        signal: this.abortController.signal,
+      })
+
+      if (!response.ok) {
+        const isPermanent = PERMANENT_HTTP_CODES.has(response.status)
+        logForDebugging(
+          `SSETransport: HTTP ${response.status}${isPermanent ? ' (permanent)' : ''}`,
+          { level: 'error' },
+        )
+        logForDiagnosticsNoPII('error', 'cli_sse_connect_http_error', {
+          status: response.status,
+        })
+
+        if (isPermanent) {
+          this.state = 'closed'
+          this.onCloseCallback?.(response.status)
+          return
+        }
+
+        this.handleConnectionError()
+        return
+      }
+
+      if (!response.body) {
+        logForDebugging('SSETransport: No response body')
+        this.handleConnectionError()
+        return
+      }
+
+      // Successfully connected
+      const connectDuration = Date.now() - connectStartTime
+      logForDebugging('SSETransport: Connected')
+      logForDiagnosticsNoPII('info', 'cli_sse_connect_connected', {
+        duration_ms: connectDuration,
+      })
+
+      this.state = 'connected'
+      this.reconnectAttempts = 0
+      this.reconnectStartTime = null
+      this.resetLivenessTimer()
+
+      // Read the SSE stream
+      await this.readStream(response.body)
+    } catch (error) {
+      if (this.abortController?.signal.aborted) {
+        // Intentional close
+        return
+      }
+
+      logForDebugging(
+        `SSETransport: Connection error: ${errorMessage(error)}`,
+        { level: 'error' },
+      )
+      logForDiagnosticsNoPII('error', 'cli_sse_connect_error')
+      this.handleConnectionError()
+    }
+  }
+
+  /**
+   * Read and process the SSE stream body.
+   */
+  // eslint-disable-next-line eslint-plugin-n/no-unsupported-features/node-builtins
+  private async readStream(body: ReadableStream<Uint8Array>): Promise<void> {
+    const reader = body.getReader()
+    const decoder = new TextDecoder()
+    let buffer = ''
+
+    try {
+      while (true) {
+        const { done, value } = await reader.read()
+        if (done) break
+
+        buffer += decoder.decode(value, STREAM_DECODE_OPTS)
+        const { frames, remaining } = parseSSEFrames(buffer)
+        buffer = remaining
+
+        for (const frame of frames) {
+          // Any frame (including keepalive comments) proves the connection is alive
+          this.resetLivenessTimer()
+
+          if (frame.id) {
+            const seqNum = parseInt(frame.id, 10)
+            if (!isNaN(seqNum)) {
+              if (this.seenSequenceNums.has(seqNum)) {
+                logForDebugging(
+                  `SSETransport: DUPLICATE frame seq=${seqNum} (lastSequenceNum=${this.lastSequenceNum}, seenCount=${this.seenSequenceNums.size})`,
+                  { level: 'warn' },
+                )
+                logForDiagnosticsNoPII('warn', 'cli_sse_duplicate_sequence')
+              } else {
+                this.seenSequenceNums.add(seqNum)
+                // Prevent unbounded growth: once we have many entries, prune
+                // old sequence numbers that are well below the high-water mark.
+                // Only sequence numbers near lastSequenceNum matter for dedup.
+                if (this.seenSequenceNums.size > 1000) {
+                  const threshold = this.lastSequenceNum - 200
+                  for (const s of this.seenSequenceNums) {
+                    if (s < threshold) {
+                      this.seenSequenceNums.delete(s)
+                    }
+                  }
+                }
+              }
+              if (seqNum > this.lastSequenceNum) {
+                this.lastSequenceNum = seqNum
+              }
+            }
+          }
+
+          if (frame.event && frame.data) {
+            this.handleSSEFrame(frame.event, frame.data)
+          } else if (frame.data) {
+            // data: without event: — server is emitting the old envelope format
+            // or a bug. Log so incidents show as a signal instead of silent drops.
+            logForDebugging(
+              'SSETransport: Frame has data: but no event: field — dropped',
+              { level: 'warn' },
+            )
+            logForDiagnosticsNoPII('warn', 'cli_sse_frame_missing_event_field')
+          }
+        }
+      }
+    } catch (error) {
+      if (this.abortController?.signal.aborted) return
+      logForDebugging(
+        `SSETransport: Stream read error: ${errorMessage(error)}`,
+        { level: 'error' },
+      )
+      logForDiagnosticsNoPII('error', 'cli_sse_stream_read_error')
+    } finally {
+      reader.releaseLock()
+    }
+
+    // Stream ended — reconnect unless we're closing
+    if (this.state !== 'closing' && this.state !== 'closed') {
+      logForDebugging('SSETransport: Stream ended, reconnecting')
+      this.handleConnectionError()
+    }
+  }
+
+  /**
+   * Handle a single SSE frame. The event: field names the variant; data:
+   * carries the inner proto JSON directly (no envelope).
+   *
+   * Worker subscribers only receive client_event frames (see notifier.go) —
+   * any other event type indicates a server-side change that CC doesn't yet
+   * understand. Log a diagnostic so we notice in telemetry.
+   */
+  private handleSSEFrame(eventType: string, data: string): void {
+    if (eventType !== 'client_event') {
+      logForDebugging(
+        `SSETransport: Unexpected SSE event type '${eventType}' on worker stream`,
+        { level: 'warn' },
+      )
+      logForDiagnosticsNoPII('warn', 'cli_sse_unexpected_event_type', {
+        event_type: eventType,
+      })
+      return
+    }
+
+    let ev: StreamClientEvent
+    try {
+      ev = jsonParse(data) as StreamClientEvent
+    } catch (error) {
+      logForDebugging(
+        `SSETransport: Failed to parse client_event data: ${errorMessage(error)}`,
+        { level: 'error' },
+      )
+      return
+    }
+
+    const payload = ev.payload
+    if (payload && typeof payload === 'object' && 'type' in payload) {
+      const sessionLabel = this.sessionId ? ` session=${this.sessionId}` : ''
+      logForDebugging(
+        `SSETransport: Event seq=${ev.sequence_num} event_id=${ev.event_id} event_type=${ev.event_type} payload_type=${String(payload.type)}${sessionLabel}`,
+      )
+      logForDiagnosticsNoPII('info', 'cli_sse_message_received')
+      // Pass the unwrapped payload as newline-delimited JSON,
+      // matching the format that StructuredIO/WebSocketTransport consumers expect
+      this.onData?.(jsonStringify(payload) + '\n')
+    } else {
+      logForDebugging(
+        `SSETransport: Ignoring client_event with no type in payload: event_id=${ev.event_id}`,
+      )
+    }
+
+    this.onEventCallback?.(ev)
+  }
+
+  /**
+   * Handle connection errors with exponential backoff and time budget.
+   */
+  private handleConnectionError(): void {
+    this.clearLivenessTimer()
+
+    if (this.state === 'closing' || this.state === 'closed') return
+
+    // Abort any in-flight SSE fetch
+    this.abortController?.abort()
+    this.abortController = null
+
+    const now = Date.now()
+    if (!this.reconnectStartTime) {
+      this.reconnectStartTime = now
+    }
+
+    const elapsed = now - this.reconnectStartTime
+    if (elapsed < RECONNECT_GIVE_UP_MS) {
+      // Clear any existing timer
+      if (this.reconnectTimer) {
+        clearTimeout(this.reconnectTimer)
+        this.reconnectTimer = null
+      }
+
+      // Refresh headers before reconnecting
+      if (this.refreshHeaders) {
+        const freshHeaders = this.refreshHeaders()
+        Object.assign(this.headers, freshHeaders)
+        logForDebugging('SSETransport: Refreshed headers for reconnect')
+      }
+
+      this.state = 'reconnecting'
+      this.reconnectAttempts++
+
+      const baseDelay = Math.min(
+        RECONNECT_BASE_DELAY_MS * Math.pow(2, this.reconnectAttempts - 1),
+        RECONNECT_MAX_DELAY_MS,
+      )
+      // Add ±25% jitter
+      const delay = Math.max(
+        0,
+        baseDelay + baseDelay * 0.25 * (2 * Math.random() - 1),
+      )
+
+      logForDebugging(
+        `SSETransport: Reconnecting in ${Math.round(delay)}ms (attempt ${this.reconnectAttempts}, ${Math.round(elapsed / 1000)}s elapsed)`,
+      )
+      logForDiagnosticsNoPII('error', 'cli_sse_reconnect_attempt', {
+        reconnectAttempts: this.reconnectAttempts,
+      })
+
+      this.reconnectTimer = setTimeout(() => {
+        this.reconnectTimer = null
+        void this.connect()
+      }, delay)
+    } else {
+      logForDebugging(
+        `SSETransport: Reconnection time budget exhausted after ${Math.round(elapsed / 1000)}s`,
+        { level: 'error' },
+      )
+      logForDiagnosticsNoPII('error', 'cli_sse_reconnect_exhausted', {
+        reconnectAttempts: this.reconnectAttempts,
+        elapsedMs: elapsed,
+      })
+      this.state = 'closed'
+      this.onCloseCallback?.()
+    }
+  }
+
+  /**
+   * Bound timeout callback. Hoisted from an inline closure so that
+   * resetLivenessTimer (called per-frame) does not allocate a new closure
+   * on every SSE frame.
+   */
+  private readonly onLivenessTimeout = (): void => {
+    this.livenessTimer = null
+    logForDebugging('SSETransport: Liveness timeout, reconnecting', {
+      level: 'error',
+    })
+    logForDiagnosticsNoPII('error', 'cli_sse_liveness_timeout')
+    this.abortController?.abort()
+    this.handleConnectionError()
+  }
+
+  /**
+   * Reset the liveness timer. If no SSE frame arrives within the timeout,
+   * treat the connection as dead and reconnect.
+   */
+  private resetLivenessTimer(): void {
+    this.clearLivenessTimer()
+    this.livenessTimer = setTimeout(this.onLivenessTimeout, LIVENESS_TIMEOUT_MS)
+  }
+
+  private clearLivenessTimer(): void {
+    if (this.livenessTimer) {
+      clearTimeout(this.livenessTimer)
+      this.livenessTimer = null
+    }
+  }
+
+  // -----------------------------------------------------------------------
+  // Write (HTTP POST) — same pattern as HybridTransport
+  // -----------------------------------------------------------------------
+
+  async write(message: StdoutMessage): Promise<void> {
+    const authHeaders = this.getAuthHeaders()
+    if (Object.keys(authHeaders).length === 0) {
+      logForDebugging('SSETransport: No session token available for POST')
+      logForDiagnosticsNoPII('warn', 'cli_sse_post_no_token')
+      return
+    }
+
+    const headers: Record<string, string> = {
+      ...authHeaders,
+      'Content-Type': 'application/json',
+      'anthropic-version': '2023-06-01',
+      'User-Agent': getClaudeCodeUserAgent(),
+    }
+
+    logForDebugging(
+      `SSETransport: POST body keys=${Object.keys(message as Record<string, unknown>).join(',')}`,
+    )
+
+    for (let attempt = 1; attempt <= POST_MAX_RETRIES; attempt++) {
+      try {
+        const response = await axios.post(this.postUrl, message, {
+          headers,
+          validateStatus: alwaysValidStatus,
+        })
+
+        if (response.status === 200 || response.status === 201) {
+          logForDebugging(`SSETransport: POST success type=${message.type}`)
+          return
+        }
+
+        logForDebugging(
+          `SSETransport: POST ${response.status} body=${jsonStringify(response.data).slice(0, 200)}`,
+        )
+        // 4xx errors (except 429) are permanent - don't retry
+        if (
+          response.status >= 400 &&
+          response.status < 500 &&
+          response.status !== 429
+        ) {
+          logForDebugging(
+            `SSETransport: POST returned ${response.status} (client error), not retrying`,
+          )
+          logForDiagnosticsNoPII('warn', 'cli_sse_post_client_error', {
+            status: response.status,
+          })
+          return
+        }
+
+        // 429 or 5xx - retry
+        logForDebugging(
+          `SSETransport: POST returned ${response.status}, attempt ${attempt}/${POST_MAX_RETRIES}`,
+        )
+        logForDiagnosticsNoPII('warn', 'cli_sse_post_retryable_error', {
+          status: response.status,
+          attempt,
+        })
+      } catch (error) {
+        const axiosError = error as AxiosError
+        logForDebugging(
+          `SSETransport: POST error: ${axiosError.message}, attempt ${attempt}/${POST_MAX_RETRIES}`,
+        )
+        logForDiagnosticsNoPII('warn', 'cli_sse_post_network_error', {
+          attempt,
+        })
+      }
+
+      if (attempt === POST_MAX_RETRIES) {
+        logForDebugging(
+          `SSETransport: POST failed after ${POST_MAX_RETRIES} attempts, continuing`,
+        )
+        logForDiagnosticsNoPII('warn', 'cli_sse_post_retries_exhausted')
+        return
+      }
+
+      const delayMs = Math.min(
+        POST_BASE_DELAY_MS * Math.pow(2, attempt - 1),
+        POST_MAX_DELAY_MS,
+      )
+      await sleep(delayMs)
+    }
+  }
+
+  // -----------------------------------------------------------------------
+  // Transport interface
+  // -----------------------------------------------------------------------
+
+  isConnectedStatus(): boolean {
+    return this.state === 'connected'
+  }
+
+  isClosedStatus(): boolean {
+    return this.state === 'closed'
+  }
+
+  setOnData(callback: (data: string) => void): void {
+    this.onData = callback
+  }
+
+  setOnClose(callback: (closeCode?: number) => void): void {
+    this.onCloseCallback = callback
+  }
+
+  setOnEvent(callback: (event: StreamClientEvent) => void): void {
+    this.onEventCallback = callback
+  }
+
+  close(): void {
+    if (this.reconnectTimer) {
+      clearTimeout(this.reconnectTimer)
+      this.reconnectTimer = null
+    }
+    this.clearLivenessTimer()
+
+    this.state = 'closing'
+    this.abortController?.abort()
+    this.abortController = null
+  }
+}
+
+// ---------------------------------------------------------------------------
+// URL Conversion
+// ---------------------------------------------------------------------------
+
+/**
+ * Convert an SSE URL to the HTTP POST endpoint URL.
+ * The SSE stream URL and POST URL share the same base; the POST endpoint
+ * is at `/events` (without `/stream`).
+ *
+ * From: https://api.example.com/v2/session_ingress/session/<session_id>/events/stream
+ * To:   https://api.example.com/v2/session_ingress/session/<session_id>/events
+ */
+function convertSSEUrlToPostUrl(sseUrl: URL): string {
+  let pathname = sseUrl.pathname
+  // Remove /stream suffix to get the POST events endpoint
+  if (pathname.endsWith('/stream')) {
+    pathname = pathname.slice(0, -'/stream'.length)
+  }
+  return `${sseUrl.protocol}//${sseUrl.host}${pathname}`
+}