@ogcio/o11y-sdk-node/dist/sdk-node/lib/processor/nextjs-span-processor.js

Opentelemetry standard instrumentation SDK for NodeJS based project

import { SpanStatusCode } from "@opentelemetry/api";
import { OnEndingHookSpanProcessor } from "./on-ending-hook-span-processor.js";
export class NextJsSpanProcessor extends OnEndingHookSpanProcessor {
    onEnding(span) {
        // ref. https://grafana.com/docs/grafana-cloud/monitor-applications/frontend-observability/quickstart/nextjs/#instrument-the-nextjs-backend
        if (span.name.startsWith("GET /_next/static")) {
            span.updateName("GET /_next/static");
        }
        else if (span.name.startsWith("GET /_next/data")) {
            span.updateName("GET /_next/data");
        }
        if (span.status.code !== SpanStatusCode.ERROR)
            return;
        const events = span.events;
        let cleaned = 0;
        let exceptions = 0;
        for (let i = events.length - 1; i >= 0; i--) {
            // Required only for NexJS v14
            if (events[i].name == "exception") {
                exceptions++;
                if (typeof events[i].attributes?.["exception.message"] === "string" &&
                    events[i].attributes?.["exception.message"] === "NEXT_REDIRECT") {
                    events.splice(i, 1);
                    cleaned++;
                }
            }
        }
        const status = {
            ...span.status,
            code: cleaned === exceptions ? SpanStatusCode.UNSET : span.status.code,
        };
        if (cleaned) {
            span.setAttribute("o11y.sdk.nextjs.lifecycle.redirect.cleaned", true);
        }
        span.setStatus(status);
        Object.assign(span, {
            events,
        });
    }
}