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authorGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
committerGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
commite06ec920f7a5d784e674c4c4b4e6d1da3dc7391d (patch)
tree55713f725f77b44ebfec86e4eec3ce33e71458ca /node_modules/chrome-trace-event/dist/trace-event.js
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+"use strict";
+/**
+ * trace-event - A library to create a trace of your node app per
+ * Google's Trace Event format:
+ * // JSSTYLED
+ * https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+var tslib_1 = require("tslib");
+var stream_1 = require("stream");
+function evCommon() {
+ var hrtime = process.hrtime(); // [seconds, nanoseconds]
+ var ts = hrtime[0] * 1000000 + Math.round(hrtime[1] / 1000); // microseconds
+ return {
+ ts: ts,
+ pid: process.pid,
+ tid: process.pid // no meaningful tid for node.js
+ };
+}
+var Tracer = /** @class */ (function (_super) {
+ tslib_1.__extends(Tracer, _super);
+ function Tracer(opts) {
+ if (opts === void 0) { opts = {}; }
+ var _this = _super.call(this) || this;
+ _this.noStream = false;
+ _this.events = [];
+ if (typeof opts !== "object") {
+ throw new Error("Invalid options passed (must be an object)");
+ }
+ if (opts.parent != null && typeof opts.parent !== "object") {
+ throw new Error("Invalid option (parent) passed (must be an object)");
+ }
+ if (opts.fields != null && typeof opts.fields !== "object") {
+ throw new Error("Invalid option (fields) passed (must be an object)");
+ }
+ if (opts.objectMode != null &&
+ (opts.objectMode !== true && opts.objectMode !== false)) {
+ throw new Error("Invalid option (objectsMode) passed (must be a boolean)");
+ }
+ _this.noStream = opts.noStream || false;
+ _this.parent = opts.parent;
+ if (_this.parent) {
+ _this.fields = Object.assign({}, opts.parent && opts.parent.fields);
+ }
+ else {
+ _this.fields = {};
+ }
+ if (opts.fields) {
+ Object.assign(_this.fields, opts.fields);
+ }
+ if (!_this.fields.cat) {
+ // trace-viewer *requires* `cat`, so let's have a fallback.
+ _this.fields.cat = "default";
+ }
+ else if (Array.isArray(_this.fields.cat)) {
+ _this.fields.cat = _this.fields.cat.join(",");
+ }
+ if (!_this.fields.args) {
+ // trace-viewer *requires* `args`, so let's have a fallback.
+ _this.fields.args = {};
+ }
+ if (_this.parent) {
+ // TODO: Not calling Readable ctor here. Does that cause probs?
+ // Probably if trying to pipe from the child.
+ // Might want a serpate TracerChild class for these guys.
+ _this._push = _this.parent._push.bind(_this.parent);
+ }
+ else {
+ _this._objectMode = Boolean(opts.objectMode);
+ var streamOpts = { objectMode: _this._objectMode };
+ if (_this._objectMode) {
+ _this._push = _this.push;
+ }
+ else {
+ _this._push = _this._pushString;
+ streamOpts.encoding = "utf8";
+ }
+ stream_1.Readable.call(_this, streamOpts);
+ }
+ return _this;
+ }
+ /**
+ * If in no streamMode in order to flush out the trace
+ * you need to call flush.
+ */
+ Tracer.prototype.flush = function () {
+ if (this.noStream === true) {
+ for (var _i = 0, _a = this.events; _i < _a.length; _i++) {
+ var evt = _a[_i];
+ this._push(evt);
+ }
+ this._flush();
+ }
+ };
+ Tracer.prototype._read = function (_) { };
+ Tracer.prototype._pushString = function (ev) {
+ var separator = "";
+ if (!this.firstPush) {
+ this.push("[");
+ this.firstPush = true;
+ }
+ else {
+ separator = ",\n";
+ }
+ this.push(separator + JSON.stringify(ev), "utf8");
+ };
+ Tracer.prototype._flush = function () {
+ if (!this._objectMode) {
+ this.push("]");
+ }
+ };
+ Tracer.prototype.child = function (fields) {
+ return new Tracer({
+ parent: this,
+ fields: fields
+ });
+ };
+ Tracer.prototype.begin = function (fields) {
+ return this.mkEventFunc("b")(fields);
+ };
+ Tracer.prototype.end = function (fields) {
+ return this.mkEventFunc("e")(fields);
+ };
+ Tracer.prototype.completeEvent = function (fields) {
+ return this.mkEventFunc("X")(fields);
+ };
+ Tracer.prototype.instantEvent = function (fields) {
+ return this.mkEventFunc("I")(fields);
+ };
+ Tracer.prototype.mkEventFunc = function (ph) {
+ var _this = this;
+ return function (fields) {
+ var ev = evCommon();
+ // Assign the event phase.
+ ev.ph = ph;
+ if (fields) {
+ if (typeof fields === "string") {
+ ev.name = fields;
+ }
+ else {
+ for (var _i = 0, _a = Object.keys(fields); _i < _a.length; _i++) {
+ var k = _a[_i];
+ if (k === "cat") {
+ ev.cat = fields.cat.join(",");
+ }
+ else {
+ ev[k] = fields[k];
+ }
+ }
+ }
+ }
+ if (!_this.noStream) {
+ _this._push(ev);
+ }
+ else {
+ _this.events.push(ev);
+ }
+ };
+ };
+ return Tracer;
+}(stream_1.Readable));
+exports.Tracer = Tracer;
+/*
+ * These correspond to the "Async events" in the Trace Events doc.
+ *
+ * Required fields:
+ * - name
+ * - id
+ *
+ * Optional fields:
+ * - cat (array)
+ * - args (object)
+ * - TODO: stack fields, other optional fields?
+ *
+ * Dev Note: We don't explicitly assert that correct fields are
+ * used for speed (premature optimization alert!).
+ */
+//# sourceMappingURL=trace-event.js.map \ No newline at end of file