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build and log our own JSON output for traces instead of using opentel…
…emetry-exporter-logging-otlp opentelemetry-exporter-logging-otlp depends on a Jackson version that is incompatible with the one used by Finagle, which unfortunately makes it a nonstarter
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core/src/main/scala/com/dwolla/tracing/LoggingSpanExporter.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| package com.dwolla.tracing | ||
|
|
||
| import cats.* | ||
| import cats.syntax.all.* | ||
| import cats.effect.std.* | ||
| import com.dwolla.tracing.LoggingSpanExporter.* | ||
| import io.opentelemetry.sdk.common.CompletableResultCode | ||
| import io.opentelemetry.sdk.trace.`export`.SpanExporter | ||
| import io.opentelemetry.sdk.trace.data.{EventData, LinkData, SpanData, StatusData} | ||
| import org.typelevel.log4cats.Logger | ||
| import io.circe.literal.* | ||
| import io.circe.syntax.* | ||
| import io.circe.* | ||
| import io.opentelemetry.api.common.Attributes | ||
| import io.opentelemetry.api.trace.{SpanContext, SpanKind, StatusCode} | ||
| import io.opentelemetry.proto.trace.v1.internal.{Span, Status} | ||
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|
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| import java.util | ||
| import scala.jdk.CollectionConverters.* | ||
|
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| private[tracing] class LoggingSpanExporter[F[_] : Applicative : Logger](dispatcher: Dispatcher[F]) extends SpanExporter { | ||
| override def `export`(spans: util.Collection[SpanData]): CompletableResultCode = | ||
| dispatcher.unsafeRunSync { | ||
| Logger[F].info { | ||
| spans | ||
| .asScala | ||
| .toList | ||
| .map(_.asJson) | ||
| .map(_.noSpaces) | ||
| .mkString("\n") | ||
| } | ||
| .as(CompletableResultCode.ofSuccess()) | ||
| } | ||
|
|
||
| override def flush(): CompletableResultCode = | ||
| CompletableResultCode.ofSuccess() | ||
|
|
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| override def shutdown(): CompletableResultCode = | ||
| CompletableResultCode.ofSuccess() | ||
| } | ||
|
|
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| object LoggingSpanExporter { | ||
| implicit val AttributesEncoder: Encoder[Attributes] = | ||
| Encoder[Map[String, String]].contramap { | ||
| _.asMap().asScala.toMap.map { case (k, v) => | ||
| k.getKey -> v.toString | ||
| } | ||
| } | ||
|
|
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| implicit val SpanKindEncoder: Encoder[SpanKind] = | ||
| Encoder[Int].contramap { | ||
| case SpanKind.INTERNAL => Span.SpanKind.SPAN_KIND_INTERNAL.getEnumNumber | ||
| case SpanKind.SERVER => Span.SpanKind.SPAN_KIND_SERVER.getEnumNumber | ||
| case SpanKind.CLIENT => Span.SpanKind.SPAN_KIND_CLIENT.getEnumNumber | ||
| case SpanKind.PRODUCER => Span.SpanKind.SPAN_KIND_PRODUCER.getEnumNumber | ||
| case SpanKind.CONSUMER => Span.SpanKind.SPAN_KIND_CONSUMER.getEnumNumber | ||
| } | ||
|
|
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| implicit val EventDataEncoder: Encoder[EventData] = // TODO implement a real encoder | ||
| Encoder.AsObject.instance(_ => JsonObject.empty) | ||
|
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| implicit val SpanContextEncoder: Encoder[SpanContext] = // TODO implement a real encoder | ||
| Encoder.AsObject.instance(_ => JsonObject.empty) | ||
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| implicit val LinkDataEncoder: Encoder[LinkData] = Encoder.instance { ld => | ||
| json"""{ | ||
| "spanContext": ${ld.getSpanContext}, | ||
| "attributes": ${ld.getAttributes} | ||
| }""" | ||
| } | ||
|
|
||
| implicit val StatusCodeEncoder: Encoder[StatusCode] = Encoder[Int].contramap { | ||
| case StatusCode.OK => Status.StatusCode.STATUS_CODE_OK.getEnumNumber | ||
| case StatusCode.ERROR => Status.StatusCode.STATUS_CODE_ERROR.getEnumNumber | ||
| case StatusCode.UNSET => Status.StatusCode.STATUS_CODE_UNSET.getEnumNumber | ||
| } | ||
|
|
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| implicit val StatusDataEncoder: Encoder[StatusData] = Encoder.instance { sd => | ||
| json"""{ | ||
| "code": ${sd.getStatusCode}, | ||
| "description": ${sd.getDescription} | ||
| }""" | ||
| } | ||
|
|
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| implicit val SpanDataEncoder: Encoder[SpanData] = Encoder.instance { sp => | ||
| json""" | ||
| { | ||
| "resource": { | ||
| "attributes": [] | ||
| }, | ||
| "scopeSpans": [ | ||
| { | ||
| "scope": { | ||
| "name": ${sp.getInstrumentationScopeInfo.getName}, | ||
| "attributes": ${sp.getInstrumentationScopeInfo.getAttributes} | ||
| }, | ||
| "spans": [ | ||
| { | ||
| "traceId": ${sp.getTraceId}, | ||
| "spanId": ${sp.getSpanId}, | ||
| "name": ${sp.getName}, | ||
| "kind": ${sp.getKind}, | ||
| "startTimeUnixNano": ${sp.getStartEpochNanos}, | ||
| "endTimeUnixNano": ${sp.getEndEpochNanos}, | ||
| "attributes": ${sp.getAttributes}, | ||
| "events": ${sp.getEvents.asScala}, | ||
| "links": ${sp.getLinks.asScala}, | ||
| "status": ${sp.getStatus} | ||
| } | ||
| ] | ||
| } | ||
| ] | ||
| }""" | ||
| } | ||
| } |
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