tracing

Documentation

Index

• Constants
• func GetSpan(r *http.Request) opentracing.Span
• func InjectRequestHeaders(r *http.Request)
• func LogEventf(r *http.Request, format string, args ...interface{})
• func LogRequest(span opentracing.Span, r *http.Request)
• func LogResponseCode(span opentracing.Span, code int)
• func SetError(r *http.Request)
• func SetErrorWithEvent(r *http.Request, format string, args ...interface{})
• func StartSpan(r *http.Request, operationName string, spanKind ext.SpanKindEnum, ...) (opentracing.Span, *http.Request, func())
• func WithTracing(ctx context.Context, tracing *Tracing) context.Context
• type HTTPHeadersCarrier
  • func (c HTTPHeadersCarrier) ForeachKey(handler func(key, val string) error) error
  • func (c HTTPHeadersCarrier) Set(key, val string)
• type Tracing
  • func FromContext(ctx context.Context) (*Tracing, error)
  • func NewTracing(serviceName string, spanNameLimit int, trackingBackend TrackingBackend) (*Tracing, error)
  • func (t *Tracing) Close()
  • func (t *Tracing) Extract(format interface{}, carrier interface{}) (opentracing.SpanContext, error)
  • func (t *Tracing) Inject(sm opentracing.SpanContext, format interface{}, carrier interface{}) error
  • func (t *Tracing) IsEnabled() bool
  • func (t *Tracing) StartSpan(operationName string, opts ...opentracing.StartSpanOption) opentracing.Span
  • func (t *Tracing) StartSpanf(r *http.Request, spanKind ext.SpanKindEnum, opPrefix string, opParts []string, ...) (opentracing.Span, *http.Request, func())
• type TrackingBackend

Constants

const OperationNameMaxLengthNumber = 10

OperationNameMaxLengthNumber defines the number of static characters in a Span Trace name: 8 chars for hash + 2 chars for '_'.

const (
	// SpanKindNoneEnum Span kind enum none.
	SpanKindNoneEnum ext.SpanKindEnum = "none"
)

const TraceNameHashLength = 8

TraceNameHashLength defines the number of characters to use from the head of the generated hash.

Functions

func GetSpan

func GetSpan(r *http.Request) opentracing.Span

GetSpan used to retrieve span from request context.

func InjectRequestHeaders

func InjectRequestHeaders(r *http.Request)

InjectRequestHeaders used to inject OpenTracing headers into the request.

func LogEventf

func LogEventf(r *http.Request, format string, args ...interface{})

LogEventf logs an event to the span in the request context.

func LogRequest

func LogRequest(span opentracing.Span, r *http.Request)

LogRequest used to create span tags from the request.

func LogResponseCode

func LogResponseCode(span opentracing.Span, code int)

LogResponseCode used to log response code in span.

func SetError

func SetError(r *http.Request)

SetError flags the span associated with this request as in error.

func SetErrorWithEvent

func SetErrorWithEvent(r *http.Request, format string, args ...interface{})

SetErrorWithEvent flags the span associated with this request as in error and log an event.

func StartSpan

func StartSpan(r *http.Request, operationName string, spanKind ext.SpanKindEnum, opts ...opentracing.StartSpanOption) (opentracing.Span, *http.Request, func())

StartSpan starts a new span from the one in the request context

func WithTracing

func WithTracing(ctx context.Context, tracing *Tracing) context.Context

WithTracing Adds Tracing into the context.

Types

type HTTPHeadersCarrier

type HTTPHeadersCarrier http.Header

HTTPHeadersCarrier custom implementation to fix duplicated headers It has been fixed in https://github.com/opentracing/opentracing-go/pull/191

func (HTTPHeadersCarrier) ForeachKey

func (c HTTPHeadersCarrier) ForeachKey(handler func(key, val string) error) error

ForeachKey conforms to the TextMapReader interface.

func (HTTPHeadersCarrier) Set

func (c HTTPHeadersCarrier) Set(key, val string)

Set conforms to the TextMapWriter interface.

type Tracing

type Tracing struct {
	ServiceName   string `description:"Set the name for this service" export:"true"`
	SpanNameLimit int    `description:"Set the maximum character limit for Span names (default 0 = no limit)" export:"true"`
	// contains filtered or unexported fields
}

Tracing middleware.

func FromContext

func FromContext(ctx context.Context) (*Tracing, error)

FromContext Gets Tracing from context.

func NewTracing

func NewTracing(serviceName string, spanNameLimit int, trackingBackend TrackingBackend) (*Tracing, error)

NewTracing Creates a Tracing.

func (*Tracing) Close

func (t *Tracing) Close()

Close tracer

func (*Tracing) Extract

func (t *Tracing) Extract(format interface{}, carrier interface{}) (opentracing.SpanContext, error)

Extract delegates to opentracing.Tracer.

func (*Tracing) Inject

func (t *Tracing) Inject(sm opentracing.SpanContext, format interface{}, carrier interface{}) error

Inject delegates to opentracing.Tracer.

func (*Tracing) IsEnabled

func (t *Tracing) IsEnabled() bool

IsEnabled determines if tracing was successfully activated.

func (*Tracing) StartSpan

func (t *Tracing) StartSpan(operationName string, opts ...opentracing.StartSpanOption) opentracing.Span

StartSpan delegates to opentracing.Tracer.

func (*Tracing) StartSpanf

func (t *Tracing) StartSpanf(r *http.Request, spanKind ext.SpanKindEnum, opPrefix string, opParts []string, separator string, opts ...opentracing.StartSpanOption) (opentracing.Span, *http.Request, func())

StartSpanf delegates to StartSpan.

type TrackingBackend

type TrackingBackend interface {
	Setup(componentName string) (opentracing.Tracer, io.Closer, error)
}

TrackingBackend is an abstraction for tracking backend (Jaeger, Zipkin, ...).