http

Documentation

Overview

Package http contains several http middlewares which can be used for instrumenting calls with Zipkin.

Index

• Variables
• func Discard() *bool
• func NewServerMiddleware(t *zipkin.Tracer, options ...ServerOption) func(http.Handler) http.Handler
• func NewTransport(tracer *zipkin.Tracer, options ...TransportOption) (http.RoundTripper, error)
• func Sample() *bool
• type Client
  • func NewClient(tracer *zipkin.Tracer, options ...ClientOption) (*Client, error)
  • func (c *Client) DoWithAppSpan(req *http.Request, name string) (res *http.Response, err error)
• type ClientOption
  • func ClientTags(tags map[string]string) ClientOption
  • func ClientTrace(enabled bool) ClientOption
  • func TransportOptions(options ...TransportOption) ClientOption
  • func WithClient(client *http.Client) ClientOption
  • func WithRemoteEndpoint(remoteEndpoint *model.Endpoint) ClientOption
• type ErrHandler
• type ErrResponseReader
• type RequestSamplerFunc
• type ServerOption
  • func RequestSampler(sampleFunc RequestSamplerFunc) ServerOption
  • func ServerErrHandler(eh ErrHandler) ServerOption
  • func ServerTags(tags map[string]string) ServerOption
  • func SpanName(name string) ServerOption
  • func TagResponseSize(enabled bool) ServerOption
• type TransportOption
  • func RoundTripper(rt http.RoundTripper) TransportOption
  • func TransportErrHandler(h ErrHandler) TransportOption
  • func TransportErrResponseReader(r ErrResponseReader) TransportOption
  • func TransportLogger(l *log.Logger) TransportOption
  • func TransportRemoteEndpoint(remoteEndpoint *model.Endpoint) TransportOption
  • func TransportRequestSampler(sampleFunc RequestSamplerFunc) TransportOption
  • func TransportTags(tags map[string]string) TransportOption
  • func TransportTrace(enable bool) TransportOption

Variables

var ErrValidTracerRequired = errors.New("valid tracer required")

ErrValidTracerRequired error

Functions

func Discard

func Discard() *bool

Discard is a convenience function that returns a pointer to a boolean false. Use this for RequestSamplerFuncs when wanting the RequestSampler to override the sampling decision to no.

func NewServerMiddleware

func NewServerMiddleware(t *zipkin.Tracer, options ...ServerOption) func(http.Handler) http.Handler

NewServerMiddleware returns a http.Handler middleware with Zipkin tracing.

func NewTransport

func NewTransport(tracer *zipkin.Tracer, options ...TransportOption) (http.RoundTripper, error)

NewTransport returns a new Zipkin instrumented http RoundTripper which can be used with a standard library http Client.

func Sample

func Sample() *bool

Sample is a convenience function that returns a pointer to a boolean true. Use this for RequestSamplerFuncs when wanting the RequestSampler to override the sampling decision to yes.

Types

type Client

type Client struct {
	*http.Client
	// contains filtered or unexported fields
}

Client holds a Zipkin instrumented HTTP Client.

func NewClient

func NewClient(tracer *zipkin.Tracer, options ...ClientOption) (*Client, error)

NewClient returns an HTTP Client adding Zipkin instrumentation around an embedded standard Go http.Client.

func (*Client) DoWithAppSpan

func (c *Client) DoWithAppSpan(req *http.Request, name string) (res *http.Response, err error)

DoWithAppSpan wraps http.Client's Do with tracing using an application span.

type ClientOption

type ClientOption func(*Client)

ClientOption allows optional configuration of Client.

func ClientTags

func ClientTags(tags map[string]string) ClientOption

ClientTags adds default Tags to inject into client application spans.

func ClientTrace

func ClientTrace(enabled bool) ClientOption

ClientTrace allows one to enable Go's net/http/httptrace.

func TransportOptions

func TransportOptions(options ...TransportOption) ClientOption

TransportOptions passes optional Transport configuration to the internal transport used by Client.

func WithClient

func WithClient(client *http.Client) ClientOption

WithClient allows one to add a custom configured http.Client to use.

func WithRemoteEndpoint

func WithRemoteEndpoint(remoteEndpoint *model.Endpoint) ClientOption

WithRemoteEndpoint will set the remote endpoint for all spans.

type ErrHandler

type ErrHandler func(sp zipkin.Span, err error, statusCode int)

ErrHandler allows instrumentations to decide how to tag errors based on the response status code >399 and the error from the Transport.RoundTrip

type ErrResponseReader

type ErrResponseReader func(sp zipkin.Span, body io.Reader)

ErrResponseReader allows instrumentations to read the error body and decide to obtain information to it and add it to the span i.e. tag the span with a more meaningful error code or with error details.

type RequestSamplerFunc

type RequestSamplerFunc func(r *http.Request) *bool

RequestSamplerFunc can be implemented for client and/or server side sampling decisions that can override the existing upstream sampling decision. If the implementation returns nil, the existing sampling decision stays as is.

type ServerOption

type ServerOption func(*handler)

ServerOption allows Middleware to be optionally configured.

func RequestSampler

func RequestSampler(sampleFunc RequestSamplerFunc) ServerOption

RequestSampler allows one to set the sampling decision based on the details found in the http.Request. If wanting to keep the existing sampling decision from upstream as is, this function should return nil.

func ServerErrHandler

func ServerErrHandler(eh ErrHandler) ServerOption

ServerErrHandler allows to pass a custom error handler for the server response

func ServerTags

func ServerTags(tags map[string]string) ServerOption

ServerTags adds default Tags to inject into server spans.

func SpanName

func SpanName(name string) ServerOption

SpanName sets the name of the spans the middleware creates. Use this if wrapping each endpoint with its own Middleware. If omitting the SpanName option, the middleware will use the http request method as span name.

func TagResponseSize

func TagResponseSize(enabled bool) ServerOption

TagResponseSize will instruct the middleware to Tag the http response size in the server side span.

type TransportOption

type TransportOption func(*transport)

TransportOption allows one to configure optional transport configuration.

func RoundTripper

func RoundTripper(rt http.RoundTripper) TransportOption

RoundTripper adds the Transport RoundTripper to wrap.

func TransportErrHandler

func TransportErrHandler(h ErrHandler) TransportOption

TransportErrHandler allows to pass a custom error handler for the round trip

func TransportErrResponseReader

func TransportErrResponseReader(r ErrResponseReader) TransportOption

TransportErrResponseReader allows to pass a custom ErrResponseReader

func TransportLogger

func TransportLogger(l *log.Logger) TransportOption

TransportLogger allows to plug a logger into the transport

func TransportRemoteEndpoint

func TransportRemoteEndpoint(remoteEndpoint *model.Endpoint) TransportOption

TransportRemoteEndpoint will set the remote endpoint for all spans.

func TransportRequestSampler

func TransportRequestSampler(sampleFunc RequestSamplerFunc) TransportOption

TransportRequestSampler allows one to set the sampling decision based on the details found in the http.Request. It has preference over the existing sampling decision contained in the context. The function returns a *bool, if returning nil, sampling decision is not being changed whereas returning something else than nil is being used as sampling decision.

func TransportTags

func TransportTags(tags map[string]string) TransportOption

TransportTags adds default Tags to inject into transport spans.

func TransportTrace

func TransportTrace(enable bool) TransportOption

TransportTrace allows one to enable Go's net/http/httptrace.