package observability

import (

"context"

"errors"

"log/slog"

"github.com/github/github-mcp-server/pkg/observability/metrics"

)

// Exporters bundles observability primitives (logger + metrics) for dependency injection.

// The logger is Go's stdlib *slog.Logger — integrators provide their own slog.Handler.

type Exporters interface {

Logger() *slog.Logger

Metrics(context.Context) metrics.Metrics

}

type exporters struct {

logger *slog.Logger

metrics metrics.Metrics

}

// NewExporters creates an Exporters bundle. Pass a configured *slog.Logger

// (with whatever slog.Handler you need) and a Metrics implementation.

// Neither may be nil; use slog.New(slog.DiscardHandler) and metrics.NewNoopMetrics()

// if logging or metrics are unwanted.

func NewExporters(logger *slog.Logger, m metrics.Metrics) (Exporters, error) {

if logger == nil {

return nil, errors.New("logger must not be nil: use slog.New(slog.DiscardHandler) to discard logs")

}

if m == nil {

return nil, errors.New("metrics must not be nil: use metrics.NewNoopMetrics() to discard metrics")

}

return &exporters{

logger: logger,

metrics: m,

}, nil

}

func (e *exporters) Logger() *slog.Logger {

return e.logger

}

func (e *exporters) Metrics(_ context.Context) metrics.Metrics {

return e.metrics

}