40 lines
1.4 KiB
TypeScript
40 lines
1.4 KiB
TypeScript
import { appendFile, mkdir } from "node:fs/promises";
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import path from "node:path";
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export interface LogEntry {
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ts: string;
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level: "info" | "warn" | "error";
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event: string;
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[k: string]: unknown;
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}
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export class JsonLogger {
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constructor(private logFile: string | null, public verbose: boolean) {}
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async log(level: LogEntry["level"], event: string, extra: Record<string, unknown> = {}): Promise<void> {
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const entry: LogEntry = { ts: new Date().toISOString(), level, event, ...extra };
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const line = JSON.stringify(entry);
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if (this.verbose) process.stderr.write(`[${level}] ${event} ${jsonExtras(extra)}\n`);
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if (this.logFile) {
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await mkdir(path.dirname(this.logFile), { recursive: true });
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await appendFile(this.logFile, line + "\n", "utf-8");
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}
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}
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info(event: string, extra?: Record<string, unknown>) {
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return this.log("info", event, extra);
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}
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warn(event: string, extra?: Record<string, unknown>) {
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return this.log("warn", event, extra);
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}
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error(event: string, extra?: Record<string, unknown>) {
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return this.log("error", event, extra);
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}
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}
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function jsonExtras(extra: Record<string, unknown>): string {
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const entries = Object.entries(extra);
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if (entries.length === 0) return "";
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return entries.map(([k, v]) => `${k}=${typeof v === "string" ? v : JSON.stringify(v)}`).join(" ");
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}
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