109 lines
3.0 KiB
TypeScript
109 lines
3.0 KiB
TypeScript
interface StdoutTakeoverState {
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rawStdoutWrite: (chunk: string, callback?: (error?: Error | null) => void) => boolean;
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rawStderrWrite: (chunk: string, callback?: (error?: Error | null) => void) => boolean;
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originalStdoutWrite: typeof process.stdout.write;
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}
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let stdoutTakeoverState: StdoutTakeoverState | undefined;
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const RAW_STDOUT_RETRY_DELAY_MS = 10;
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let rawStdoutWriteTail: Promise<void> = Promise.resolve();
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function getRawStdoutWrite(): StdoutTakeoverState["rawStdoutWrite"] {
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if (stdoutTakeoverState) {
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return stdoutTakeoverState.rawStdoutWrite;
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}
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return process.stdout.write.bind(process.stdout) as StdoutTakeoverState["rawStdoutWrite"];
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}
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async function writeRawStdoutChunk(text: string): Promise<void> {
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while (true) {
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try {
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await new Promise<void>((resolve, reject) => {
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try {
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getRawStdoutWrite()(text, (error) => {
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if (error) reject(error);
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else resolve();
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});
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} catch (error) {
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reject(error instanceof Error ? error : new Error(String(error)));
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}
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});
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return;
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} catch (error) {
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const writeError = error instanceof Error ? error : new Error(String(error));
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const code = (writeError as Error & { code?: unknown }).code;
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if (code !== "ENOBUFS" && code !== "EAGAIN" && code !== "EWOULDBLOCK") {
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throw writeError;
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}
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await new Promise<void>((resolve) => setTimeout(resolve, RAW_STDOUT_RETRY_DELAY_MS));
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}
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}
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}
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export function takeOverStdout(): void {
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if (stdoutTakeoverState) {
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return;
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}
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const rawStdoutWrite = process.stdout.write.bind(process.stdout) as StdoutTakeoverState["rawStdoutWrite"];
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const rawStderrWrite = process.stderr.write.bind(process.stderr) as StdoutTakeoverState["rawStderrWrite"];
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const originalStdoutWrite = process.stdout.write;
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process.stdout.write = ((
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chunk: string | Uint8Array,
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encodingOrCallback?: BufferEncoding | ((error?: Error | null) => void),
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callback?: (error?: Error | null) => void,
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): boolean => {
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if (typeof encodingOrCallback === "function") {
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return rawStderrWrite(String(chunk), encodingOrCallback);
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}
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return rawStderrWrite(String(chunk), callback);
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}) as typeof process.stdout.write;
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stdoutTakeoverState = {
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rawStdoutWrite,
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rawStderrWrite,
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originalStdoutWrite,
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};
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}
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export function restoreStdout(): void {
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if (!stdoutTakeoverState) {
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return;
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}
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process.stdout.write = stdoutTakeoverState.originalStdoutWrite;
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stdoutTakeoverState = undefined;
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}
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export function isStdoutTakenOver(): boolean {
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return stdoutTakeoverState !== undefined;
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}
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export function writeRawStdout(text: string): void {
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if (text.length === 0) {
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return;
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}
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rawStdoutWriteTail = rawStdoutWriteTail.then(() => writeRawStdoutChunk(text));
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void rawStdoutWriteTail.catch(() => {
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process.exit(1);
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});
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}
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export async function waitForRawStdoutBackpressure(): Promise<void> {
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while (true) {
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const tail = rawStdoutWriteTail;
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await tail;
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if (tail === rawStdoutWriteTail) {
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return;
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}
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}
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}
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export async function flushRawStdout(): Promise<void> {
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await waitForRawStdoutBackpressure();
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await writeRawStdoutChunk("");
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}
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