Add auto instrumentation for winston

[obecny]

Weekly downloads: 3.8 mln
https://www.npmjs.com/package/winston

[pauldraper]

import opentelemetry from '@opentelemetry/api';
import { Format, format } from 'logform';
import { createLogger } from 'winston';

function tracingFormat(): Format {
  const tracer = opentelemetry.trace.getTracer('logform');
  return format(info => {
    const span = tracer.getCurrentSpan();
    if (span) {
      const context = span.context();
      info['trace.id'] = context.traceId;
      info['span.id'] = context.spanId;
    }
    return info;
  })();
}

const logger = createLogger({
  format: format.combine(tracingFormat(), format.json())
});

[vmarchaud]

I think we can close this one since #736 has been closed ?

[DisaPadla]

@pauldraper Hi. What is a solution for @opentelemetry/api@0.18.1 ? we don't have tracer.getCurrentSpan() anymore

[dyladan]

@pauldraper Hi. What is a solution for @opentelemetry/api@0.18.1 ? we don't have tracer.getCurrentSpan() anymore

You can get the currently active span by doing

import { context, getSpan, Span } from "@opentelemetry/api";

const span: Span | undefined = getSpan(context.active());

[roastedmonk]

@pauldraper Hi. What is a solution for @opentelemetry/api@0.18.1 ? we don't have tracer.getCurrentSpan() anymore

You can get the currently active span by doing

import { context, getSpan, Span } from "@opentelemetry/api";

const span: Span | undefined = getSpan(context.active());

Will this not require span.end()?

[Flarna]

Will this not require span.end()?

Nope, you get a reference to an existing span or undefined. No span is created/started here. As the span here is started by someone else the responsibly to end it is still there not here.

[janquijano]

What's the solution for 1.0.4? There's no getSpan anymore.

[Flarna]

@janquijano it's still here, was moved from top level into trace namespace, see open-telemetry/opentelemetry-js-api#47