forked from grafana/loki
/
spanlogger.go
76 lines (61 loc) · 2.27 KB
/
spanlogger.go
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package spanlogger
import (
"context"
"github.com/go-kit/log"
"github.com/grafana/dskit/spanlogger"
"github.com/opentracing/opentracing-go"
"github.com/grafana/dskit/tenant"
util_log "github.com/grafana/loki/pkg/util/log"
)
type loggerCtxMarker struct{}
const (
// TenantIDsTagName is the tenant IDs tag name.
TenantIDsTagName = spanlogger.TenantIDsTagName
)
type resolverProxy struct{}
func (r *resolverProxy) TenantID(ctx context.Context) (string, error) {
return tenant.TenantID(ctx)
}
func (r *resolverProxy) TenantIDs(ctx context.Context) ([]string, error) {
return tenant.TenantIDs(ctx)
}
var (
loggerCtxKey = &loggerCtxMarker{}
resolver = &resolverProxy{}
)
// SpanLogger unifies tracing and logging, to reduce repetition.
type SpanLogger = spanlogger.SpanLogger
// New makes a new SpanLogger with a log.Logger to send logs to. The provided context will have the logger attached
// to it and can be retrieved with FromContext.
func New(ctx context.Context, method string, kvps ...interface{}) (*SpanLogger, context.Context) {
return spanlogger.New(ctx, util_log.Logger, method, resolver, kvps...)
}
// NewWithLogger is like New but allows to pass a logger.
func NewWithLogger(ctx context.Context, logger log.Logger, method string, kvps ...interface{}) (*SpanLogger, context.Context) {
return spanlogger.New(ctx, logger, method, resolver, kvps...)
}
// FromContext returns a SpanLogger using the current parent span.
// If there is no parent span, the SpanLogger will only log to the logger
// within the context. If the context doesn't have a logger, the fallback
// logger is used.
func FromContext(ctx context.Context) *SpanLogger {
return spanlogger.FromContext(ctx, util_log.Logger, resolver)
}
// FromContextWithFallback returns a span logger using the current parent span.
// IF there is no parent span, the SpanLogger will only log to the logger
// within the context. If the context doesn't have a logger, the fallback
// logger is used.
func FromContextWithFallback(ctx context.Context, fallback log.Logger) *SpanLogger {
logger, ok := ctx.Value(loggerCtxKey).(log.Logger)
if !ok {
logger = fallback
}
sp := opentracing.SpanFromContext(ctx)
if sp == nil {
sp = defaultNoopSpan
}
return &SpanLogger{
Logger: util_log.WithContext(ctx, logger),
Span: sp,
}
}