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* RPC Client for programmatic access to the coding agent.\n *\n * Spawns the agent in RPC mode and provides a typed API for all operations.\n */\n\nimport { type ChildProcess, spawn } from \"node:child_process\";\nimport type { AgentEvent, AgentMessage, ThinkingLevel } from \"@earendil-works/pi-agent-core\";\nimport type { ImageContent } from \"@earendil-works/pi-ai\";\nimport type { SessionStats } from \"../../core/agent-session.js\";\nimport type { BashResult } from \"../../core/bash-executor.js\";\nimport type { CompactionResult } from \"../../core/compaction/index.js\";\nimport { attachJsonlLineReader, serializeJsonLine } from \"./jsonl.js\";\nimport type { RpcCommand, RpcResponse, RpcSessionState, RpcSlashCommand } from \"./rpc-types.js\";\n\n// ============================================================================\n// Types\n// ============================================================================\n\n/** Distributive Omit that works with union types */\ntype DistributiveOmit<T, K extends keyof T> = T extends unknown ? Omit<T, K> : never;\n\n/** RpcCommand without the id field (for internal send) */\ntype RpcCommandBody = DistributiveOmit<RpcCommand, \"id\">;\n\nexport interface RpcClientOptions {\n\t/** Path to the CLI entry point (default: searches for dist/cli.js) */\n\tcliPath?: string;\n\t/** Working directory for the agent */\n\tcwd?: string;\n\t/** Environment variables */\n\tenv?: Record<string, string>;\n\t/** Provider to use */\n\tprovider?: string;\n\t/** Model ID to use */\n\tmodel?: string;\n\t/** Additional CLI arguments */\n\targs?: string[];\n}\n\nexport interface ModelInfo {\n\tprovider: string;\n\tid: string;\n\tcontextWindow: number;\n\treasoning: boolean;\n}\n\nexport type RpcEventListener = (event: AgentEvent) => void;\n\n// ============================================================================\n// RPC Client\n// ============================================================================\n\nexport class RpcClient {\n\tprivate process: ChildProcess | null = null;\n\tprivate stopReadingStdout: (() => void) | null = null;\n\tprivate eventListeners: RpcEventListener[] = [];\n\tprivate pendingRequests: Map<string, { resolve: (response: RpcResponse) => void; reject: (error: Error) => void }> =\n\t\tnew Map();\n\tprivate requestId = 0;\n\tprivate stderr = \"\";\n\n\tconstructor(private options: RpcClientOptions = {}) {}\n\n\t/**\n\t * Start the RPC agent process.\n\t */\n\tasync start(): Promise<void> {\n\t\tif (this.process) {\n\t\t\tthrow new Error(\"Client already started\");\n\t\t}\n\n\t\tconst cliPath = this.options.cliPath ?? \"dist/cli.js\";\n\t\tconst args = [\"--mode\", \"rpc\"];\n\n\t\tif (this.options.provider) {\n\t\t\targs.push(\"--provider\", this.options.provider);\n\t\t}\n\t\tif (this.options.model) {\n\t\t\targs.push(\"--model\", this.options.model);\n\t\t}\n\t\tif (this.options.args) {\n\t\t\targs.push(...this.options.args);\n\t\t}\n\n\t\tthis.process = spawn(\"node\", [cliPath, ...args], {\n\t\t\tcwd: this.options.cwd,\n\t\t\tenv: { ...process.env, ...this.options.env },\n\t\t\tstdio: [\"pipe\", \"pipe\", \"pipe\"],\n\t\t});\n\n\t\t// Collect stderr for debugging\n\t\tthis.process.stderr?.on(\"data\", (data) => {\n\t\t\tthis.stderr += data.toString();\n\t\t\tprocess.stderr.write(data);\n\t\t});\n\n\t\t// Set up strict JSONL reader for stdout.\n\t\tthis.stopReadingStdout = attachJsonlLineReader(this.process.stdout!, (line) => {\n\t\t\tthis.handleLine(line);\n\t\t});\n\n\t\t// Wait a moment for process to initialize\n\t\tawait new Promise((resolve) => setTimeout(resolve, 100));\n\n\t\tif (this.process.exitCode !== null) {\n\t\t\tthrow new Error(`Agent process exited immediately with code ${this.process.exitCode}. Stderr: ${this.stderr}`);\n\t\t}\n\t}\n\n\t/**\n\t * Stop the RPC agent process.\n\t */\n\tasync stop(): Promise<void> {\n\t\tif (!this.process) return;\n\n\t\tthis.stopReadingStdout?.();\n\t\tthis.stopReadingStdout = null;\n\t\tthis.process.kill(\"SIGTERM\");\n\n\t\t// Wait for process to exit\n\t\tawait new Promise<void>((resolve) => {\n\t\t\tconst timeout = setTimeout(() => {\n\t\t\t\tthis.process?.kill(\"SIGKILL\");\n\t\t\t\tresolve();\n\t\t\t}, 1000);\n\n\t\t\tthis.process?.on(\"exit\", () => {\n\t\t\t\tclearTimeout(timeout);\n\t\t\t\tresolve();\n\t\t\t});\n\t\t});\n\n\t\tthis.process = null;\n\t\tthis.pendingRequests.clear();\n\t}\n\n\t/**\n\t * Subscribe to agent events.\n\t */\n\tonEvent(listener: RpcEventListener): () => void {\n\t\tthis.eventListeners.push(listener);\n\t\treturn () => {\n\t\t\tconst index = this.eventListeners.indexOf(listener);\n\t\t\tif (index !== -1) {\n\t\t\t\tthis.eventListeners.splice(index, 1);\n\t\t\t}\n\t\t};\n\t}\n\n\t/**\n\t * Get collected stderr output (useful for debugging).\n\t */\n\tgetStderr(): string {\n\t\treturn this.stderr;\n\t}\n\n\t// =========================================================================\n\t// Command Methods\n\t// =========================================================================\n\n\t/**\n\t * Send a prompt to the agent.\n\t * Returns immediately after sending; use onEvent() to receive streaming events.\n\t * Use waitForIdle() to wait for completion.\n\t */\n\tasync prompt(message: string, images?: ImageContent[]): Promise<void> {\n\t\tawait this.send({ type: \"prompt\", message, images });\n\t}\n\n\t/**\n\t * Queue a steering message to interrupt the agent mid-run.\n\t */\n\tasync steer(message: string, images?: ImageContent[]): Promise<void> {\n\t\tawait this.send({ type: \"steer\", message, images });\n\t}\n\n\t/**\n\t * Queue a follow-up message to be processed after the agent finishes.\n\t */\n\tasync followUp(message: string, images?: ImageContent[]): Promise<void> {\n\t\tawait this.send({ type: \"follow_up\", message, images });\n\t}\n\n\t/**\n\t * Abort current operation.\n\t */\n\tasync abort(): Promise<void> {\n\t\tawait this.send({ type: \"abort\" });\n\t}\n\n\t/**\n\t * Start a new session, optionally with parent tracking.\n\t * @param parentSession - Optional parent session path for lineage tracking\n\t * @returns Object with `cancelled: true` if an extension cancelled the new session\n\t */\n\tasync newSession(parentSession?: string): Promise<{ cancelled: boolean }> {\n\t\tconst response = await this.send({ type: \"new_session\", parentSession });\n\t\treturn this.getData(response);\n\t}\n\n\t/**\n\t * Get current session state.\n\t */\n\tasync getState(): Promise<RpcSessionState> {\n\t\tconst response = await this.send({ type: \"get_state\" });\n\t\treturn this.getData(response);\n\t}\n\n\t/**\n\t * Set model by provider and ID.\n\t */\n\tasync setModel(provider: string, modelId: string): Promise<{ provider: string; id: string }> {\n\t\tconst response = await this.send({ type: \"set_model\", provider, modelId });\n\t\treturn this.getData(response);\n\t}\n\n\t/**\n\t * Cycle to next model.\n\t */\n\tasync cycleModel(): Promise<{\n\t\tmodel: { provider: string; id: string };\n\t\tthinkingLevel: ThinkingLevel;\n\t\tisScoped: boolean;\n\t} | null> {\n\t\tconst response = await this.send({ type: \"cycle_model\" });\n\t\treturn this.getData(response);\n\t}\n\n\t/**\n\t * Get list of available models.\n\t */\n\tasync getAvailableModels(): Promise<ModelInfo[]> {\n\t\tconst response = await this.send({ type: \"get_available_models\" });\n\t\treturn this.getData<{ models: ModelInfo[] }>(response).models;\n\t}\n\n\t/**\n\t * Set thinking level.\n\t */\n\tasync setThinkingLevel(level: ThinkingLevel): Promise<void> {\n\t\tawait this.send({ type: \"set_thinking_level\", level });\n\t}\n\n\t/**\n\t * Cycle thinking level.\n\t */\n\tasync cycleThinkingLevel(): Promise<{ level: ThinkingLevel } | null> {\n\t\tconst response = await this.send({ type: \"cycle_thinking_level\" });\n\t\treturn this.getData(response);\n\t}\n\n\t/**\n\t * Set steering mode.\n\t */\n\tasync setSteeringMode(mode: \"all\" | \"one-at-a-time\"): Promise<void> {\n\t\tawait this.send({ type: \"set_steering_mode\", mode });\n\t}\n\n\t/**\n\t * Set follow-up mode.\n\t */\n\tasync setFollowUpMode(mode: \"all\" | \"one-at-a-time\"): Promise<void> {\n\t\tawait this.send({ type: \"set_follow_up_mode\", mode });\n\t}\n\n\t/**\n\t * Compact session context.\n\t */\n\tasync compact(customInstructions?: string): Promise<CompactionResult> {\n\t\tconst response = await this.send({ type: \"compact\", customInstructions });\n\t\treturn this.getData(response);\n\t}\n\n\t/**\n\t * Set auto-compaction enabled/disabled.\n\t */\n\tasync setAutoCompaction(enabled: boolean): Promise<void> {\n\t\tawait this.send({ type: \"set_auto_compaction\", enabled });\n\t}\n\n\t/**\n\t * Set auto-retry enabled/disabled.\n\t */\n\tasync setAutoRetry(enabled: boolean): Promise<void> {\n\t\tawait this.send({ type: \"set_auto_retry\", enabled });\n\t}\n\n\t/**\n\t * Abort in-progress retry.\n\t */\n\tasync abortRetry(): Promise<void> {\n\t\tawait this.send({ type: \"abort_retry\" });\n\t}\n\n\t/**\n\t * Execute a bash command.\n\t */\n\tasync bash(command: string): Promise<BashResult> {\n\t\tconst response = await this.send({ type: \"bash\", command });\n\t\treturn this.getData(response);\n\t}\n\n\t/**\n\t * Abort running bash command.\n\t */\n\tasync abortBash(): Promise<void> {\n\t\tawait this.send({ type: \"abort_bash\" });\n\t}\n\n\t/**\n\t * Get session statistics.\n\t */\n\tasync getSessionStats(): Promise<SessionStats> {\n\t\tconst response = await this.send({ type: \"get_session_stats\" });\n\t\treturn this.getData(response);\n\t}\n\n\t/**\n\t * Export session to HTML.\n\t */\n\tasync exportHtml(outputPath?: string): Promise<{ path: string }> {\n\t\tconst response = await this.send({ type: \"export_html\", outputPath });\n\t\treturn this.getData(response);\n\t}\n\n\t/**\n\t * Switch to a different session file.\n\t * @returns Object with `cancelled: true` if an extension cancelled the switch\n\t */\n\tasync switchSession(sessionPath: string): Promise<{ cancelled: boolean }> {\n\t\tconst response = await this.send({ type: \"switch_session\", sessionPath });\n\t\treturn this.getData(response);\n\t}\n\n\t/**\n\t * Fork from a specific message.\n\t * @returns Object with `text` (the message text) and `cancelled` (if extension cancelled)\n\t */\n\tasync fork(entryId: string): Promise<{ text: string; cancelled: boolean }> {\n\t\tconst response = await this.send({ type: \"fork\", entryId });\n\t\treturn this.getData(response);\n\t}\n\n\t/**\n\t * Clone the current active branch into a new session.\n\t * @returns Object with `cancelled: true` if an extension cancelled the clone\n\t */\n\tasync clone(): Promise<{ cancelled: boolean }> {\n\t\tconst response = await this.send({ type: \"clone\" });\n\t\treturn this.getData(response);\n\t}\n\n\t/**\n\t * Get messages available for forking.\n\t */\n\tasync getForkMessages(): Promise<Array<{ entryId: string; text: string }>> {\n\t\tconst response = await this.send({ type: \"get_fork_messages\" });\n\t\treturn this.getData<{ messages: Array<{ entryId: string; text: string }> }>(response).messages;\n\t}\n\n\t/**\n\t * Get text of last assistant message.\n\t */\n\tasync getLastAssistantText(): Promise<string | null> {\n\t\tconst response = await this.send({ type: \"get_last_assistant_text\" });\n\t\treturn this.getData<{ text: string | null }>(response).text;\n\t}\n\n\t/**\n\t * Set the session display name.\n\t */\n\tasync setSessionName(name: string): Promise<void> {\n\t\tawait this.send({ type: \"set_session_name\", name });\n\t}\n\n\t/**\n\t * Get all messages in the session.\n\t */\n\tasync getMessages(): Promise<AgentMessage[]> {\n\t\tconst response = await this.send({ type: \"get_messages\" });\n\t\treturn this.getData<{ messages: AgentMessage[] }>(response).messages;\n\t}\n\n\t/**\n\t * Get available commands (extension commands, prompt templates, skills).\n\t */\n\tasync getCommands(): Promise<RpcSlashCommand[]> {\n\t\tconst response = await this.send({ type: \"get_commands\" });\n\t\treturn this.getData<{ commands: RpcSlashCommand[] }>(response).commands;\n\t}\n\n\t// =========================================================================\n\t// Helpers\n\t// =========================================================================\n\n\t/**\n\t * Wait for agent to become idle (no streaming).\n\t * Resolves when agent_end event is received.\n\t */\n\twaitForIdle(timeout = 60000): Promise<void> {\n\t\treturn new Promise((resolve, reject) => {\n\t\t\tconst timer = setTimeout(() => {\n\t\t\t\tunsubscribe();\n\t\t\t\treject(new Error(`Timeout waiting for agent to become idle. Stderr: ${this.stderr}`));\n\t\t\t}, timeout);\n\n\t\t\tconst unsubscribe = this.onEvent((event) => {\n\t\t\t\tif (event.type === \"agent_end\") {\n\t\t\t\t\tclearTimeout(timer);\n\t\t\t\t\tunsubscribe();\n\t\t\t\t\tresolve();\n\t\t\t\t}\n\t\t\t});\n\t\t});\n\t}\n\n\t/**\n\t * Collect events until agent becomes idle.\n\t */\n\tcollectEvents(timeout = 60000): Promise<AgentEvent[]> {\n\t\treturn new Promise((resolve, reject) => {\n\t\t\tconst events: AgentEvent[] = [];\n\t\t\tconst timer = setTimeout(() => {\n\t\t\t\tunsubscribe();\n\t\t\t\treject(new Error(`Timeout collecting events. Stderr: ${this.stderr}`));\n\t\t\t}, timeout);\n\n\t\t\tconst unsubscribe = this.onEvent((event) => {\n\t\t\t\tevents.push(event);\n\t\t\t\tif (event.type === \"agent_end\") {\n\t\t\t\t\tclearTimeout(timer);\n\t\t\t\t\tunsubscribe();\n\t\t\t\t\tresolve(events);\n\t\t\t\t}\n\t\t\t});\n\t\t});\n\t}\n\n\t/**\n\t * Send prompt and wait for completion, returning all events.\n\t */\n\tasync promptAndWait(message: string, images?: ImageContent[], timeout = 60000): Promise<AgentEvent[]> {\n\t\tconst eventsPromise = this.collectEvents(timeout);\n\t\tawait this.prompt(message, images);\n\t\treturn eventsPromise;\n\t}\n\n\t// =========================================================================\n\t// Internal\n\t// =========================================================================\n\n\tprivate handleLine(line: string): void {\n\t\ttry {\n\t\t\tconst data = JSON.parse(line);\n\n\t\t\t// Check if it's a response to a pending request\n\t\t\tif (data.type === \"response\" && data.id && this.pendingRequests.has(data.id)) {\n\t\t\t\tconst pending = this.pendingRequests.get(data.id)!;\n\t\t\t\tthis.pendingRequests.delete(data.id);\n\t\t\t\tpending.resolve(data as RpcResponse);\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Otherwise it's an event\n\t\t\tfor (const listener of this.eventListeners) {\n\t\t\t\tlistener(data as AgentEvent);\n\t\t\t}\n\t\t} catch {\n\t\t\t// Ignore non-JSON lines\n\t\t}\n\t}\n\n\tprivate async send(command: RpcCommandBody): Promise<RpcResponse> {\n\t\tif (!this.process?.stdin) {\n\t\t\tthrow new Error(\"Client not started\");\n\t\t}\n\n\t\tconst id = `req_${++this.requestId}`;\n\t\tconst fullCommand = { ...command, id } as RpcCommand;\n\n\t\treturn new Promise((resolve, reject) => {\n\t\t\tthis.pendingRequests.set(id, { resolve, reject });\n\n\t\t\tconst timeout = setTimeout(() => {\n\t\t\t\tthis.pendingRequests.delete(id);\n\t\t\t\treject(new Error(`Timeout waiting for response to ${command.type}. Stderr: ${this.stderr}`));\n\t\t\t}, 30000);\n\n\t\t\tthis.pendingRequests.set(id, {\n\t\t\t\tresolve: (response) => {\n\t\t\t\t\tclearTimeout(timeout);\n\t\t\t\t\tresolve(response);\n\t\t\t\t},\n\t\t\t\treject: (error) => {\n\t\t\t\t\tclearTimeout(timeout);\n\t\t\t\t\treject(error);\n\t\t\t\t},\n\t\t\t});\n\n\t\t\tthis.process!.stdin!.write(serializeJsonLine(fullCommand));\n\t\t});\n\t}\n\n\tprivate getData<T>(response: RpcResponse): T {\n\t\tif (!response.success) {\n\t\t\tconst errorResponse = response as Extract<RpcResponse, { success: false }>;\n\t\t\tthrow new Error(errorResponse.error);\n\t\t}\n\t\t// Type assertion: we trust response.data matches T based on the command sent.\n\t\t// This is safe because each public method specifies the correct T for its command.\n\t\tconst successResponse = response as Extract<RpcResponse, { success: true; data: unknown }>;\n\t\treturn successResponse.data as T;\n\t}\n}\n"]}