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import { join } from "@std/path";
import { toFileNameString } from "./date.ts";
export type LogLevel = "error" | "warn" | "info";
export interface LogEntry {
content: [unknown, ...unknown[]];
level?: LogLevel;
cause?: unknown;
}
export interface LogEntryBuilder {
withLevel(level: LogLevel): LogEntryBuilder;
withCause(cause: unknown): LogEntryBuilder;
setError(error: boolean): LogEntryBuilder;
write(): void;
}
export interface ExternalLogStream extends Disposable {
stream: WritableStream;
}
export class Logger {
#indentSize = 2;
#externalLogDir?: string;
#contextStack: { depth: number; level: LogLevel }[] = [
{ depth: 0, level: "info" },
];
get #context() {
return this.#contextStack.at(-1)!;
}
get indentSize() {
return this.#indentSize;
}
set indentSize(value: number) {
this.#indentSize = value;
}
get externalLogDir() {
return this.#externalLogDir;
}
set externalLogDir(value: string | undefined) {
this.#externalLogDir = value;
if (value != null) {
Deno.mkdirSync(value, {
recursive: true,
});
}
}
write(entry: LogEntry): void {
const { content, level, cause } = entry;
const [message, ...rest] = content;
console[level ?? this.#context.level](
" ".repeat(this.#indentSize * this.#context.depth) + String(message),
...(cause != null ? [cause, ...rest] : rest),
);
}
push(entry: LogEntry): Disposable {
this.write(entry);
this.#contextStack.push({
depth: this.#context.depth + 1,
level: entry.level ?? this.#context.level,
});
return {
[Symbol.dispose]: () => {
this.#contextStack.pop();
},
};
}
info(message: unknown, ...args: unknown[]) {
this.write({ level: "info", content: [message, ...args] });
}
warn(message: unknown, ...args: unknown[]) {
this.write({ level: "warn", content: [message, ...args] });
}
error(message: unknown, ...args: unknown[]) {
this.write({ level: "error", content: [message, ...args] });
}
builder(message: unknown, ...args: unknown[]): LogEntryBuilder {
const entry: LogEntry = {
content: [message, ...args],
level: "info",
cause: undefined,
};
const builder: LogEntryBuilder = {
withCause: (cause) => {
entry.cause = cause;
return builder;
},
withLevel: (level) => {
entry.level = level;
return builder;
},
setError: (error) => {
if (error) entry.level = "error";
return builder;
},
write: () => {
this.write(entry);
},
};
return builder;
}
async createExternalLogStream(
name: string,
options?: {
noTime?: boolean;
},
): Promise<ExternalLogStream> {
if (name.includes("/")) {
throw new Error(`External log stream's name (${name}) contains '/'.`);
}
if (this.#externalLogDir == null) {
throw new Error("External log directory is not set.");
}
const logPath = join(
this.#externalLogDir,
options?.noTime === true
? name
: `${name}-${toFileNameString(new Date())}`,
);
const file = await Deno.open(logPath, {
read: false,
write: true,
append: true,
create: true,
});
return {
stream: file.writable,
[Symbol.dispose]: file[Symbol.dispose].bind(file),
};
}
async createExternalLogStreamsForProgram(
program: string,
): Promise<{ stdout: WritableStream; stderr: WritableStream } & Disposable> {
const stdout = await this.createExternalLogStream(`${program}-stdout`);
const stderr = await this.createExternalLogStream(`${program}-stderr`);
return {
stdout: stdout.stream,
stderr: stderr.stream,
[Symbol.dispose]: () => {
stdout[Symbol.dispose]();
stderr[Symbol.dispose]();
},
};
}
}
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