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/**
* Structured, level-filtered logging for the service's own messages.
*
* matter.js library logging is configured separately (see controller.ts); this
* logger covers service-level events in the format:
*
* 2026-07-26T20:00:00.100Z INFO controller Connected to Matter node 1
*/
export const LOG_LEVELS = ["debug", "info", "warn", "error"] as const;
export type LogLevel = (typeof LOG_LEVELS)[number];
export function isLogLevel(value: unknown): value is LogLevel {
return typeof value === "string" && (LOG_LEVELS as readonly string[]).includes(value);
}
const LEVEL_RANK: Record<LogLevel, number> = { debug: 0, info: 1, warn: 2, error: 3 };
const LEVEL_LABEL: Record<LogLevel, string> = {
debug: "DEBUG",
info: "INFO ",
warn: "WARN ",
error: "ERROR",
};
let globalLevel: LogLevel = "info";
export function setLogLevel(level: LogLevel): void {
globalLevel = level;
}
export function getLogLevel(): LogLevel {
return globalLevel;
}
function write(level: LogLevel, module: string, message: string): void {
if (LEVEL_RANK[level] < LEVEL_RANK[globalLevel]) return;
const line = `${new Date().toISOString()} ${LEVEL_LABEL[level]} ${module} ${message}`;
if (level === "error" || level === "warn") {
process.stderr.write(line + "\n");
} else {
process.stdout.write(line + "\n");
}
}
/** A logger bound to a module name (e.g. "controller", "sync"). */
export class Log {
constructor(private readonly module: string) {}
debug(message: string): void {
write("debug", this.module, message);
}
info(message: string): void {
write("info", this.module, message);
}
warn(message: string): void {
write("warn", this.module, message);
}
error(message: string, cause?: unknown): void {
write("error", this.module, cause === undefined ? message : `${message}: ${describeError(cause)}`);
}
}
export function describeError(cause: unknown): string {
if (cause instanceof Error) {
return cause.message;
}
return String(cause);
}
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