mirror of
https://github.com/opentofu/opentofu.git
synced 2024-12-25 16:31:10 -06:00
94 lines
3.4 KiB
Go
94 lines
3.4 KiB
Go
// Copyright (c) The OpenTofu Authors
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// SPDX-License-Identifier: MPL-2.0
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// Copyright (c) 2023 HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package main
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import (
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"context"
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"os"
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"go.opentelemetry.io/contrib/exporters/autoexport"
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"go.opentelemetry.io/otel"
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"go.opentelemetry.io/otel/propagation"
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"go.opentelemetry.io/otel/sdk/resource"
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sdktrace "go.opentelemetry.io/otel/sdk/trace"
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semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
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"go.opentelemetry.io/otel/trace"
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"github.com/opentofu/opentofu/version"
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)
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// If this environment variable is set to "otlp" when running OpenTofu CLI
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// then we'll enable an experimental OTLP trace exporter.
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//
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// BEWARE! This is not a committed external interface.
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//
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// Everything about this is experimental and subject to change in future
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// releases. Do not depend on anything about the structure of this output.
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// This mechanism might be removed altogether if a different strategy seems
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// better based on experience with this experiment.
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const openTelemetryExporterEnvVar = "OTEL_TRACES_EXPORTER"
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// tracer is the OpenTelemetry tracer to use for traces in package main only.
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var tracer trace.Tracer
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func init() {
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tracer = otel.Tracer("github.com/opentofu/opentofu")
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}
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// openTelemetryInit initializes the optional OpenTelemetry exporter.
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//
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// By default we don't export telemetry information at all, since OpenTofu is
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// a CLI tool and so we don't assume we're running in an environment with
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// a telemetry collector available.
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//
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// However, for those running OpenTofu in automation we allow setting
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// the standard OpenTelemetry environment variable OTEL_TRACES_EXPORTER=otlp
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// to enable an OTLP exporter, which is in turn configured by all of the
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// standard OTLP exporter environment variables:
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//
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// https://opentelemetry.io/docs/specs/otel/protocol/exporter/#configuration-options
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//
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// We don't currently support any other telemetry export protocols, because
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// OTLP has emerged as a de-facto standard and each other exporter we support
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// means another relatively-heavy external dependency. OTLP happens to use
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// protocol buffers and gRPC, which OpenTofu would depend on for other reasons
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// anyway.
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func openTelemetryInit() error {
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// We'll check the environment variable ourselves first, because the
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// "autoexport" helper we're about to use is built under the assumption
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// that exporting should always be enabled and so will expect to find
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// an OTLP server on localhost if no environment variables are set at all.
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if os.Getenv(openTelemetryExporterEnvVar) != "otlp" {
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return nil // By default we just discard all telemetry calls
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}
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otelResource := resource.NewWithAttributes(
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semconv.SchemaURL,
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semconv.ServiceNameKey.String("Terraform CLI"),
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semconv.ServiceVersionKey.String(version.Version),
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)
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// If the environment variable was set to explicitly enable telemetry
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// then we'll enable it, using the "autoexport" library to automatically
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// handle the details based on the other OpenTelemetry standard environment
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// variables.
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exp, err := autoexport.NewSpanExporter(context.Background())
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if err != nil {
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return err
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}
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sp := sdktrace.NewSimpleSpanProcessor(exp)
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provider := sdktrace.NewTracerProvider(
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sdktrace.WithSpanProcessor(sp),
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sdktrace.WithResource(otelResource),
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)
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otel.SetTracerProvider(provider)
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pgtr := propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{})
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otel.SetTextMapPropagator(pgtr)
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return nil
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}
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