private _patch()

in src/instrumentation.ts [30:70]

• 24 lines of code
• 1 McCabe index (conditional complexity)

    private _patch(azFunc: typeof AzFunc): typeof AzFunc {
        const disposables: AzFunc.Disposable[] = [];

        // Tell the Azure Functions Host that we will send logs directly from Node.js
        // (so that the host doesn't duplicate)
        azFunc.app.setup({
            capabilities: {
                WorkerOpenTelemetryEnabled: true,
            },
        });

        // Send logs directly from Node.js
        disposables.push(
            azFunc.app.hook.log((context) => {
                this.logger.emit({
                    body: context.message,
                    severityNumber: toOtelSeverityNumber(context.level),
                    severityText: context.level,
                });
            })
        );

        // Ensure Azure Functions Host trace context is propagated onto the user's Node.js function handler
        disposables.push(
            azFunc.app.hook.preInvocation((context) => {
                const traceContext = context.invocationContext.traceContext;
                if (traceContext) {
                    context.functionHandler = otelContext.bind(
                        propagation.extract(otelContext.active(), {
                            traceparent: traceContext.traceParent,
                            tracestate: traceContext.traceState,
                        }),
                        context.functionHandler
                    );
                }
            })
        );

        this._azFuncDisposable = azFunc.Disposable.from(...disposables);
        return azFunc;
    }