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// Copyright 2018 the Deno authors. All rights reserved. MIT license.
import * as msg from "gen/msg_generated";
export interface TraceInfo {
sync: boolean; // is synchronous call
name: string; // name of operation
}
interface TraceStackNode {
list: TraceInfo[];
prev: TraceStackNode | null;
}
let current: TraceStackNode | null = null;
// Push a new list to trace stack
function pushStack(): void {
if (current === null) {
current = { list: [], prev: null };
} else {
const newStack = { list: [], prev: current };
current = newStack;
}
}
// Pop from trace stack and (if possible) concat to parent trace stack node
function popStack(): TraceInfo[] {
if (current === null) {
throw new Error("trace list stack should not be empty");
}
const resultList = current!.list;
if (!!current!.prev) {
const prev = current!.prev!;
// concat inner results to outer stack
prev.list = prev.list.concat(resultList);
current = prev;
} else {
current = null;
}
return resultList;
}
// Push to trace stack if we are tracing
export function maybePushTrace(op: msg.Any, sync: boolean): void {
if (current === null) {
return; // no trace requested
}
// Freeze the object, avoid tampering
current!.list.push(
Object.freeze({
sync,
name: msg.Any[op] // convert to enum names
})
);
}
/**
* Trace operations executed inside a given function or promise.
* Notice: To capture every operation in asynchronous deno.* calls,
* you might want to put them in functions instead of directly invoking.
*
* import { trace, mkdir } from "deno";
*
* const ops = await trace(async () => {
* await mkdir("my_dir");
* });
* // ops becomes [{ sync: false, name: "Mkdir" }]
*/
export async function trace(
// tslint:disable-next-line:no-any
fnOrPromise: Function | Promise<any>
): Promise<TraceInfo[]> {
pushStack();
if (typeof fnOrPromise === "function") {
await fnOrPromise();
} else {
await fnOrPromise;
}
return popStack();
}
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