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128 lines
3.3 KiB
Go
128 lines
3.3 KiB
Go
// Package tracing provides distributed tracing for the KnowFoolery application.
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package tracing
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import (
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"context"
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"fmt"
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)
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// Config holds the configuration for the tracer.
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type Config struct {
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ServiceName string
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ServiceVersion string
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Environment string
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JaegerEndpoint string
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SampleRate float64
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Enabled bool
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}
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// DefaultConfig returns a default configuration.
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func DefaultConfig() Config {
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return Config{
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ServiceName: "knowfoolery",
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ServiceVersion: "0.0.0",
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Environment: "development",
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JaegerEndpoint: "http://localhost:14268/api/traces",
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SampleRate: 1.0, // Sample all traces in development
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Enabled: false,
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}
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}
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// Tracer provides distributed tracing functionality.
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// This is a placeholder that should be implemented with OpenTelemetry.
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type Tracer struct {
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config Config
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}
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// NewTracer creates a new Tracer.
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// Note: Actual implementation should use OpenTelemetry SDK.
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func NewTracer(config Config) (*Tracer, error) {
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if !config.Enabled {
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return &Tracer{config: config}, nil
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}
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// TODO: Initialize OpenTelemetry tracer provider
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// Example implementation:
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// - Create Jaeger exporter
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// - Create tracer provider with batching
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// - Set global tracer provider
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// - Configure resource with service info
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return &Tracer{config: config}, nil
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}
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// Shutdown gracefully shuts down the tracer.
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func (t *Tracer) Shutdown(ctx context.Context) error {
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if !t.config.Enabled {
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return nil
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}
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// TODO: Shutdown tracer provider
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return nil
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}
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// StartSpan starts a new span.
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// This is a placeholder that should be implemented with OpenTelemetry.
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func (t *Tracer) StartSpan(ctx context.Context, name string) (context.Context, Span) {
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// TODO: Start actual OpenTelemetry span
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return ctx, &noopSpan{}
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}
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// Span represents a tracing span.
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type Span interface {
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// End ends the span.
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End()
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// SetAttribute sets an attribute on the span.
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SetAttribute(key string, value interface{})
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// RecordError records an error on the span.
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RecordError(err error)
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}
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// noopSpan is a no-op implementation of Span.
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type noopSpan struct{}
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func (s *noopSpan) End() {}
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func (s *noopSpan) SetAttribute(key string, value interface{}) {}
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func (s *noopSpan) RecordError(err error) {}
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// TraceServiceOperation traces a service operation.
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func TraceServiceOperation(ctx context.Context, tracer *Tracer, serviceName,
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operation string, fn func(context.Context) error) error {
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ctx, span := tracer.StartSpan(ctx, fmt.Sprintf("%s.%s", serviceName, operation))
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defer span.End()
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err := fn(ctx)
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if err != nil {
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span.RecordError(err)
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span.SetAttribute("error", true)
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}
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return err
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}
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// TraceDatabaseOperation traces a database operation.
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func TraceDatabaseOperation(ctx context.Context, tracer *Tracer, operation,
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table string, fn func(context.Context) error) error {
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ctx, span := tracer.StartSpan(ctx, fmt.Sprintf("db.%s.%s", operation, table))
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defer span.End()
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span.SetAttribute("db.operation", operation)
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span.SetAttribute("db.table", table)
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span.SetAttribute("db.system", "postgresql")
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err := fn(ctx)
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if err != nil {
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span.RecordError(err)
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}
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return err
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}
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// ConfigFromEnv creates a Config from environment variables.
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func ConfigFromEnv() Config {
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// TODO: Implement environment variable parsing
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return DefaultConfig()
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}
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