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Merge pull request #7 from piotr-oles/feature/process-sandbox
feat: process driver
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| interface Listener<TValue = void> { | ||
| resolve(value: TValue): void; | ||
| reject(error: unknown): void; | ||
| } | ||
|
|
||
| type ListenerStatus = "pending" | "resolved" | "rejected"; | ||
|
|
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| interface QueuedListener<TValue = void> extends Listener<TValue> { | ||
| apply<TListener extends Listener<TValue>>(listener: TListener): void; | ||
| resolved: TValue | undefined; | ||
| rejected: unknown | undefined; | ||
| status: ListenerStatus; | ||
| } | ||
|
|
||
| interface BufferedListener<TChunk = void, TValue = void> | ||
| extends QueuedListener<TValue> { | ||
| apply<TListener extends Listener<TValue>>( | ||
| listener: TListener, | ||
| ingest?: (chunk: TChunk, listener: Listener<TValue>) => TChunk | undefined | ||
| ): void; | ||
| ingest(chunk: TChunk): void; | ||
| buffer: TChunk[]; | ||
| } | ||
|
|
||
| function createBufferedListener<TChunk = void, TValue = void>( | ||
| buffer: TChunk[] = [] | ||
| ): BufferedListener<TChunk, TValue> { | ||
| let resolve: (value: TValue) => void | undefined; | ||
| let reject: (error: unknown) => void | undefined; | ||
|
|
||
| const bufferedListener: BufferedListener<TChunk, TValue> = { | ||
| resolve(value) { | ||
| if (bufferedListener.status === "pending") { | ||
| bufferedListener.resolved = value; | ||
| bufferedListener.status = "resolved"; | ||
|
|
||
| if (resolve) { | ||
| resolve(value); | ||
| } | ||
| } | ||
| }, | ||
| reject(error) { | ||
| if (bufferedListener.status === "pending") { | ||
| bufferedListener.rejected = error; | ||
| bufferedListener.status = "rejected"; | ||
|
|
||
| if (reject) { | ||
| reject(error); | ||
| } | ||
| } | ||
| }, | ||
| ingest(chunk: TChunk) { | ||
| bufferedListener.buffer.push(chunk); | ||
| }, | ||
| apply(listener, ingest) { | ||
| switch (bufferedListener.status) { | ||
| case "resolved": | ||
| listener.resolve(bufferedListener.resolved!); | ||
| break; | ||
| case "rejected": | ||
| listener.reject(bufferedListener.rejected); | ||
| break; | ||
| case "pending": | ||
| resolve = listener.resolve; | ||
| reject = listener.reject; | ||
| break; | ||
| } | ||
|
|
||
| if (ingest) { | ||
| const ingestListener: Listener<TValue> = { | ||
| resolve(value) { | ||
| if (bufferedListener.status === "pending") { | ||
| bufferedListener.resolved = value; | ||
| bufferedListener.status = "resolved"; | ||
| } | ||
| }, | ||
| reject(error) { | ||
| if (bufferedListener.status === "pending") { | ||
| bufferedListener.rejected = error; | ||
| bufferedListener.status = "rejected"; | ||
| } | ||
| }, | ||
| }; | ||
|
|
||
| const applyStatusChange = () => { | ||
| switch (bufferedListener.status) { | ||
| case "resolved": | ||
| listener.resolve(bufferedListener.resolved!); | ||
| break; | ||
| case "rejected": | ||
| listener.reject(bufferedListener.rejected); | ||
| break; | ||
| } | ||
| }; | ||
|
|
||
| bufferedListener.ingest = (chunk: TChunk) => { | ||
| if (bufferedListener.status === "pending") { | ||
| const ingestedChunk = ingest(chunk, ingestListener); | ||
|
|
||
| if (ingestedChunk) { | ||
| bufferedListener.buffer.push(ingestedChunk); | ||
| } | ||
|
|
||
| applyStatusChange(); | ||
| } else { | ||
| bufferedListener.buffer.push(chunk); | ||
| } | ||
| }; | ||
|
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| // process buffer | ||
| bufferedListener.buffer = bufferedListener.buffer | ||
| .map((chunk) => { | ||
| if (bufferedListener.status === "pending") { | ||
| return ingest(chunk, ingestListener); | ||
| } else { | ||
| return chunk; | ||
| } | ||
| }) | ||
| .filter((chunk) => chunk !== undefined) as TChunk[]; | ||
|
|
||
| applyStatusChange(); | ||
| } | ||
| }, | ||
| resolved: undefined, | ||
| rejected: undefined, | ||
| status: "pending", | ||
| buffer: [...buffer], | ||
| }; | ||
|
|
||
| return bufferedListener; | ||
| } | ||
|
|
||
| export { Listener, QueuedListener, BufferedListener, createBufferedListener }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| import { ChildProcess } from "child_process"; | ||
| import { BufferedListener, createBufferedListener } from "./listener"; | ||
| import stripAnsi from "strip-ansi"; | ||
|
|
||
| interface ProcessDriver { | ||
| process: ChildProcess; | ||
| waitForStdoutIncludes( | ||
| pattern: string | string[], | ||
| timeout?: number | ||
| ): Promise<void>; | ||
| waitForStderrIncludes( | ||
| pattern: string | string[], | ||
| timeout?: number | ||
| ): Promise<void>; | ||
| } | ||
|
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||
| type ProcessOutput = "stdout" | "stderr"; | ||
|
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| function createProcessDriver( | ||
| process: ChildProcess, | ||
| defaultTimeout = 30000 | ||
| ): ProcessDriver { | ||
| const listeners: Record<ProcessOutput, BufferedListener<string>> = { | ||
| stdout: createBufferedListener(), | ||
| stderr: createBufferedListener(), | ||
| }; | ||
|
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||
| if (process.stdout) { | ||
| process.stdout.on("data", (data) => { | ||
| const content = stripAnsi(data.toString()); | ||
| listeners.stdout.ingest(content); | ||
| }); | ||
| } | ||
|
|
||
| if (process.stderr) { | ||
| process.stderr.on("data", (data) => { | ||
| const content = stripAnsi(data.toString()); | ||
| listeners.stderr.ingest(content); | ||
| }); | ||
| } | ||
|
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| const waitForOutputIncludes = ( | ||
| output: ProcessOutput, | ||
| pattern: string | string[], | ||
| timeout: number | ||
| ) => | ||
| new Promise<void>((resolve, reject) => { | ||
| const timeoutId = setTimeout(() => { | ||
| reject( | ||
| new Error( | ||
| `Exceeded time on waiting for "${pattern}" to appear in the ${output}.` | ||
| ) | ||
| ); | ||
| }, timeout); | ||
|
|
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| listeners[output].apply( | ||
| { | ||
| resolve: () => { | ||
| clearTimeout(timeoutId); | ||
| listeners[output] = createBufferedListener( | ||
| listeners[output].buffer | ||
| ); | ||
| resolve(); | ||
| }, | ||
| reject: (error) => { | ||
| clearTimeout(timeoutId); | ||
| listeners[output] = createBufferedListener( | ||
| listeners[output].buffer | ||
| ); | ||
| reject(error); | ||
| }, | ||
| string: pattern, | ||
| }, | ||
| (chunk, listener) => { | ||
| let index = -1; | ||
| const strings = Array.isArray(pattern) ? pattern : [pattern]; | ||
|
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| strings.forEach((string) => { | ||
| const stringIndex = chunk.indexOf(string); | ||
|
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| index = Math.max( | ||
| index, | ||
| stringIndex === -1 ? -1 : stringIndex + string.length | ||
| ); | ||
| }); | ||
|
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| if (index !== -1) { | ||
| listener.resolve(); | ||
| return chunk.slice(index); | ||
| } | ||
| } | ||
| ); | ||
| }); | ||
|
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||
| return { | ||
| process, | ||
| waitForStdoutIncludes: (string, timeout = defaultTimeout) => | ||
| waitForOutputIncludes("stdout", string, timeout), | ||
| waitForStderrIncludes: (string, timeout = defaultTimeout) => | ||
| waitForOutputIncludes("stderr", string, timeout), | ||
| }; | ||
| } | ||
|
|
||
| export { createProcessDriver, ProcessDriver }; |
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