@snap/camera-kit/dist/metrics/reporters/reportLensWait.js

Camera Kit Web

import { forActions } from "@snap/state-management";
import { map, mergeMap, take } from "rxjs";
import { Injectable } from "@snap/ts-inject";
import { getTimeMs } from "../../common/time";
import { TypedCustomEvent } from "../../events/TypedCustomEvent";
import { lensStateFactory } from "../../session/lensState";
import { metricsEventTargetFactory } from "../metricsEventTarget";
const viewTimeThresholdSec = 0.1;
export const reportLensWait = Injectable("reportLensWait", [lensStateFactory.token, metricsEventTargetFactory.token], (lensState, metricsEventTarget) => {
    lensState.events
        .pipe(forActions("applyLens"), mergeMap(([a]) => {
        const lensId = a.data.lens.id;
        const lensGroupId = a.data.lens.groupId;
        const applyLensStartTime = getTimeMs();
        return lensState.events.pipe(forActions("firstFrameProcessed", "applyLens"), take(1), map(() => [
            (getTimeMs() - applyLensStartTime) / 1000,
            lensId,
            lensGroupId,
        ]));
    }))
        .subscribe({
        next: ([viewTimeSec, lensId, lensGroupId]) => {
            if (viewTimeSec < viewTimeThresholdSec)
                return;
            const lensWait = {
                name: "lensWait",
                lensId,
                viewTimeSec,
                lensGroupId,
            };
            metricsEventTarget.dispatchEvent(new TypedCustomEvent("lensWait", lensWait));
        },
    });
});
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