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const {
ArrayPrototypePush,
ArrayPrototypeSlice,
Error,
FunctionPrototype,
ObjectFreeze,
Proxy,
ReflectApply,
SafeSet,
SafeWeakMap,
} = primordials;
const {
codes: {
ERR_UNAVAILABLE_DURING_EXIT,
ERR_INVALID_ARG_VALUE,
},
} = require('internal/errors');
const AssertionError = require('internal/assert/assertion_error');
const {
validateUint32,
} = require('internal/validators');
const noop = FunctionPrototype;
class CallTrackerContext {
#expected;
#calls;
#name;
#stackTrace;
constructor({ expected, stackTrace, name }) {
this.#calls = [];
this.#expected = expected;
this.#stackTrace = stackTrace;
this.#name = name;
}
track(thisArg, args) {
const argsClone = ObjectFreeze(ArrayPrototypeSlice(args));
ArrayPrototypePush(this.#calls, ObjectFreeze({ thisArg, arguments: argsClone }));
}
get delta() {
return this.#calls.length - this.#expected;
}
reset() {
this.#calls = [];
}
getCalls() {
return ObjectFreeze(ArrayPrototypeSlice(this.#calls));
}
report() {
if (this.delta !== 0) {
const message = `Expected the ${this.#name} function to be ` +
`executed ${this.#expected} time(s) but was ` +
`executed ${this.#calls.length} time(s).`;
return {
message,
actual: this.#calls.length,
expected: this.#expected,
operator: this.#name,
stack: this.#stackTrace
};
}
}
}
class CallTracker {
#callChecks = new SafeSet();
#trackedFunctions = new SafeWeakMap();
#getTrackedFunction(tracked) {
if (!this.#trackedFunctions.has(tracked)) {
throw new ERR_INVALID_ARG_VALUE('tracked', tracked, 'is not a tracked function');
}
return this.#trackedFunctions.get(tracked);
}
reset(tracked) {
if (tracked === undefined) {
this.#callChecks.forEach((check) => check.reset());
return;
}
this.#getTrackedFunction(tracked).reset();
}
getCalls(tracked) {
return this.#getTrackedFunction(tracked).getCalls();
}
calls(fn, expected = 1) {
if (process._exiting)
throw new ERR_UNAVAILABLE_DURING_EXIT();
if (typeof fn === 'number') {
expected = fn;
fn = noop;
} else if (fn === undefined) {
fn = noop;
}
validateUint32(expected, 'expected', true);
const context = new CallTrackerContext({
expected,
// eslint-disable-next-line no-restricted-syntax
stackTrace: new Error(),
name: fn.name || 'calls'
});
const tracked = new Proxy(fn, {
__proto__: null,
apply(fn, thisArg, argList) {
context.track(thisArg, argList);
return ReflectApply(fn, thisArg, argList);
},
});
this.#callChecks.add(context);
this.#trackedFunctions.set(tracked, context);
return tracked;
}
report() {
const errors = [];
for (const context of this.#callChecks) {
const message = context.report();
if (message !== undefined) {
ArrayPrototypePush(errors, message);
}
}
return errors;
}
verify() {
const errors = this.report();
if (errors.length === 0) {
return;
}
const message = errors.length === 1 ?
errors[0].message :
'Functions were not called the expected number of times';
throw new AssertionError({
message,
details: errors,
});
}
}
module.exports = CallTracker;
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