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* ServeCommand
* JSON-RPC server for VS Code extension communication
*
* Phase 2b (ADR-060): Uses the full Transpiler for transpilation and symbol
* extraction, enabling include resolution, C++ auto-detection, and cross-file
* symbol support.
*/
import { createInterface, Interface } from "node:readline";
import { dirname } from "node:path";
import JsonRpcHandler from "./JsonRpcHandler";
import IJsonRpcRequest from "./types/IJsonRpcRequest";
import IJsonRpcResponse from "./types/IJsonRpcResponse";
import ConfigPrinter from "../ConfigPrinter";
import ConfigLoader from "../ConfigLoader";
import Transpiler from "../../transpiler/Transpiler";
import parseWithSymbols from "../../lib/parseWithSymbols";
import parseCHeader from "../../lib/parseCHeader";
/**
* Method handler type (async to support Transpiler.transpileSource)
*/
type MethodHandler = (
params?: Record<string, unknown>,
) => Promise<IMethodResult>;
/**
* Result from a method handler
*/
interface IMethodResult {
success: boolean;
result?: unknown;
errorCode?: number;
errorMessage?: string;
}
/**
* Result of validating and extracting source parameters.
*/
interface ISourceParams {
source: string;
filePath: string | undefined;
}
/**
* Options for the serve command
*/
interface IServeOptions {
/** Enable debug logging to stderr */
debug?: boolean;
}
/**
* JSON-RPC server command
*/
class ServeCommand {
private static shouldShutdown = false;
private static readline: Interface | null = null;
private static debugMode = false;
private static transpiler: Transpiler | null = null;
/**
* Method handlers registry
*/
private static readonly methods: Record<string, MethodHandler> = {
getVersion: ServeCommand.handleGetVersion,
initialize: ServeCommand.handleInitialize,
transpile: ServeCommand._withSourceValidation(
ServeCommand._handleTranspile,
),
parseSymbols: ServeCommand._withSourceValidation(
ServeCommand._handleParseSymbols,
),
parseCHeader: ServeCommand._withSourceValidation(
ServeCommand._handleParseCHeader,
),
shutdown: ServeCommand.handleShutdown,
};
/**
* Run the JSON-RPC server
* Reads requests from stdin, writes responses to stdout
* @param options - Server options
*/
static async run(options: IServeOptions = {}): Promise<void> {
this.debugMode = options.debug ?? false;
this.shouldShutdown = false;
this.log("server starting");
this.readline = createInterface({
input: process.stdin,
output: process.stdout,
terminal: false,
});
// Disable default output - we write responses manually
this.readline.on("line", (line: string) => {
this.handleLine(line);
});
// Wait for close or shutdown
await new Promise<void>((resolve) => {
this.readline!.on("close", () => {
this.log("server stopped");
resolve();
});
});
}
/**
* Log a debug message to stderr
*/
private static log(message: string): void {
if (this.debugMode) {
process.stderr.write(`[serve] ${message}\n`);
}
}
// ========================================================================
// Parameter Validation Helpers (Issue #707: Reduce code duplication)
// ========================================================================
/**
* Wrapper that validates source params before calling handler.
* Eliminates duplicate validation code across handlers.
*/
private static _withSourceValidation(
handler: (params: ISourceParams) => Promise<IMethodResult>,
): MethodHandler {
return async (params?: Record<string, unknown>): Promise<IMethodResult> => {
if (!params || typeof params.source !== "string") {
return {
success: false,
errorCode: JsonRpcHandler.ERROR_INVALID_PARAMS,
errorMessage: "Missing required param: source",
};
}
const validated: ISourceParams = {
source: String(params.source),
filePath:
typeof params.filePath === "string" ? params.filePath : undefined,
};
return handler(validated);
};
}
/**
* Handle a single line of input
*/
private static handleLine(line: string): void {
// Skip empty lines
if (line.trim() === "") {
return;
}
this.log(`received: ${line}`);
// Parse the request
const parseResult = JsonRpcHandler.parseRequest(line);
if (!parseResult.success) {
this.log(`parse error`);
this.writeResponse(parseResult.error!);
return;
}
const request = parseResult.request!;
this.log(`method: ${request.method}`);
// Dispatch to method handler (async)
this.dispatch(request).then((response) => {
this.writeResponse(response);
// Handle shutdown after response is written
if (this.shouldShutdown) {
this.readline?.close();
}
});
}
/**
* Dispatch a request to the appropriate handler
*/
private static async dispatch(
request: IJsonRpcRequest,
): Promise<IJsonRpcResponse> {
const handler = this.methods[request.method];
if (!handler) {
return JsonRpcHandler.formatError(
request.id,
JsonRpcHandler.ERROR_METHOD_NOT_FOUND,
`Method not found: ${request.method}`,
);
}
const result = await handler(request.params);
if (result.success) {
return JsonRpcHandler.formatResponse(request.id, result.result);
}
return JsonRpcHandler.formatError(
request.id,
result.errorCode ?? JsonRpcHandler.ERROR_INVALID_PARAMS,
result.errorMessage ?? "Unknown error",
);
}
/**
* Write a JSON response to stdout
*/
private static writeResponse(response: IJsonRpcResponse): void {
process.stdout.write(JSON.stringify(response) + "\n");
}
/**
* Handle getVersion method
*/
private static async handleGetVersion(): Promise<IMethodResult> {
return {
success: true,
result: { version: ConfigPrinter.getVersion() },
};
}
/**
* Handle initialize method
* Loads project config and creates a Transpiler instance
*/
private static async handleInitialize(
params?: Record<string, unknown>,
): Promise<IMethodResult> {
if (!params || typeof params.workspacePath !== "string") {
return {
success: false,
errorCode: JsonRpcHandler.ERROR_INVALID_PARAMS,
errorMessage: "Missing required param: workspacePath",
};
}
const workspacePath = params.workspacePath;
ServeCommand.log(`initializing with workspace: ${workspacePath}`);
const config = ConfigLoader.load(workspacePath);
ServeCommand.transpiler = new Transpiler({
inputs: [],
includeDirs: config.include ?? [],
cppRequired: config.cppRequired ?? false,
target: config.target ?? "",
debugMode: config.debugMode ?? false,
noCache: config.noCache ?? false,
});
ServeCommand.log(
`initialized (cppRequired=${config.cppRequired ?? false}, includeDirs=${(config.include ?? []).length})`,
);
return {
success: true,
result: { success: true },
};
}
/**
* Handle transpile method (called via _withSourceValidation wrapper)
* Uses full Transpiler for include resolution and C++ auto-detection
*/
private static async _handleTranspile(
params: ISourceParams,
): Promise<IMethodResult> {
if (!ServeCommand.transpiler) {
return {
success: false,
errorCode: JsonRpcHandler.ERROR_INVALID_PARAMS,
errorMessage: "Server not initialized. Call initialize first.",
};
}
const { source, filePath } = params;
const options = filePath
? { workingDir: dirname(filePath), sourcePath: filePath }
: undefined;
const result = await ServeCommand.transpiler.transpileSource(
source,
options,
);
return {
success: true,
result: {
success: result.success,
code: result.code,
errors: result.errors,
cppDetected: ServeCommand.transpiler.isCppDetected(),
},
};
}
/**
* Handle parseSymbols method (called via _withSourceValidation wrapper)
* Runs full transpilation for include/C++ detection, then extracts symbols
* from the parse tree (preserving "extract symbols even with parse errors" behavior)
*/
private static async _handleParseSymbols(
params: ISourceParams,
): Promise<IMethodResult> {
const { source, filePath } = params;
// If transpiler is initialized, run transpileSource to trigger header
// resolution and C++ detection (results are discarded, we just want
// the side effects on the symbol table)
if (ServeCommand.transpiler && filePath) {
try {
await ServeCommand.transpiler.transpileSource(source, {
workingDir: dirname(filePath),
sourcePath: filePath,
});
} catch {
// Ignore transpilation errors - we still extract symbols below
}
}
// Delegate symbol extraction to parseWithSymbols (shared with WorkspaceIndex)
const result = parseWithSymbols(source);
return {
success: true,
result,
};
}
/**
* Handle parseCHeader method (called via _withSourceValidation wrapper)
* Parses C/C++ header files and extracts symbols
*/
private static async _handleParseCHeader(
params: ISourceParams,
): Promise<IMethodResult> {
const { source, filePath } = params;
const result = parseCHeader(source, filePath);
return {
success: true,
result,
};
}
/**
* Handle shutdown method
*/
private static async handleShutdown(): Promise<IMethodResult> {
ServeCommand.shouldShutdown = true;
return {
success: true,
result: { success: true },
};
}
}
export default ServeCommand;
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