import { Controller, Get } from '@nestjs/common';
import { AppService } from './app.service';
import {
  trace,
  Span,
  propagation,
  context,
  createContextKey,
} from '@opentelemetry/api';

@Controller()
export class AppController {
  constructor(private readonly appService: AppService) {}

  @Get()
  async getHello() {
    const newTracer = trace.getTracer('user-serive');

    const ctx = context.active();
    const ctxKey = createContextKey('First ctx key');
    ctx.setValue(ctxKey, 'ctx1');
    const output = {};
    propagation.inject(ctx, output);
    console.log(output, ctx);

    const span1 = newTracer.startSpan('start1', {}, ctx);
    const spanCtx = span1.spanContext();
    await this.appService.getHello(spanCtx);
    span1.end();

    // let activeContext = propagation.extract(context.active(), {});
    // activeContext.getValue();
    const span2 = newTracer.startSpan('start2');
    this.appService.getHello2();
    span2.end();
  }
}