trace

package
v0.4.2 Latest Latest
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 Go to latest Published: Mar 31, 2020 License: Apache-2.0 Imports: 9 Imported by: 0

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Index

Constants

View Source 
const (
	B3SingleHeader       = "X-B3"
	B3DebugFlagHeader    = "X-B3-Flags"
	B3TraceIDHeader      = "X-B3-TraceId"
	B3SpanIDHeader       = "X-B3-SpanId"
	B3SampledHeader      = "X-B3-Sampled"
	B3ParentSpanIDHeader = "X-B3-ParentSpanId"
)

Variables

This section is empty.

Functions

func ContextWithRemoteSpanContext added in v0.2.2 

func ContextWithRemoteSpanContext(ctx context.Context, sc core.SpanContext) context.Context

ContextWithRemoteSpanContext creates a new context with a remote span context set to the passed span context.

func ContextWithSpan added in v0.2.1 

func ContextWithSpan(ctx context.Context, span Span) context.Context

ContextWithSpan creates a new context with a current span set to the passed span.

func DefaultHTTPPropagator added in v0.2.2 

func DefaultHTTPPropagator() propagation.HTTPPropagator

DefaultHTTPPropagator returns the default trace HTTP propagator.

func RemoteSpanContextFromContext added in v0.2.2 

func RemoteSpanContextFromContext(ctx context.Context) core.SpanContext

RemoteSpanContextFromContext returns the remote span context stored in the context.

Types

type B3 added in v0.2.2 

type B3 struct {
	SingleHeader bool
}

B3 propagator serializes core.SpanContext to/from B3 Headers. This propagator supports both version of B3 headers,

  1. Single Header : X-B3: {TraceId}-{SpanId}-{SamplingState}-{ParentSpanId}
  2. Multiple Headers: X-B3-TraceId: {TraceId} X-B3-ParentSpanId: {ParentSpanId} X-B3-SpanId: {SpanId} X-B3-Sampled: {SamplingState} X-B3-Flags: {DebugFlag}

If SingleHeader is set to true then X-B3 header is used to inject and extract. Otherwise, separate headers are used to inject and extract.

func (B3) Extract added in v0.2.2 

func (b3 B3) Extract(ctx context.Context, supplier propagation.HTTPSupplier) context.Context

Extract retrieves B3 Headers from the supplier

func (B3) GetAllKeys added in v0.2.2 

func (b3 B3) GetAllKeys() []string

func (B3) Inject added in v0.2.2 

func (b3 B3) Inject(ctx context.Context, supplier propagation.HTTPSupplier)

type Decision 

type Decision struct {
	// Sampled is set true if the span should be sampled.
	Sampled bool

	// Attributes provides insight into Sample	r's decision process.
	// It could be empty slice or nil if no attributes are recorded by the sampler.
	Attributes []core.KeyValue
}

type EndConfig added in v0.2.1 

type EndConfig struct {
	EndTime time.Time
}

EndConfig provides options to set properties of span at the time of ending the span.

type EndOption 

type EndOption func(*EndConfig)

EndOption applies changes to EndConfig that sets options when the span is ended.

func WithEndTime 

func WithEndTime(t time.Time) EndOption

WithEndTime sets the end time of the span to provided time t, when it is ended.

type ErrorConfig added in v0.2.3 

type ErrorConfig struct {
	Timestamp  time.Time
	StatusCode codes.Code
}

ErrorConfig provides options to set properties of an error event at the time it is recorded.

type ErrorOption added in v0.2.3 

type ErrorOption func(*ErrorConfig)

ErrorOption applies changes to ErrorConfig that sets options when an error event is recorded.

func WithErrorStatus added in v0.2.3 

func WithErrorStatus(s codes.Code) ErrorOption

WithErrorStatus indicates the span status that should be set when recording an error event.

func WithErrorTime added in v0.2.3 

func WithErrorTime(t time.Time) ErrorOption

WithErrorTime sets the time at which the error event should be recorded. 

type Link struct {
	core.SpanContext
	Attributes []core.KeyValue
}

Link is used to establish relationship between two spans within the same Trace or across different Traces. Few examples of Link usage.

  1. Batch Processing: A batch of elements may contain elements associated with one or more traces/spans. Since there can only be one parent SpanContext, Link is used to keep reference to SpanContext of all elements in the batch.
  2. Public Endpoint: A SpanContext in incoming client request on a public endpoint is untrusted from service provider perspective. In such case it is advisable to start a new trace with appropriate sampling decision. However, it is desirable to associate incoming SpanContext to new trace initiated on service provider side so two traces (from Client and from Service Provider) can be correlated.

type NoopProvider 

type NoopProvider struct{}

func (NoopProvider) Tracer added in v0.2.0 

func (p NoopProvider) Tracer(name string) Tracer

Tracer returns noop implementation of Tracer.

type NoopSpan 

type NoopSpan struct {
}

func (NoopSpan) AddEvent 

func (NoopSpan) AddEvent(ctx context.Context, name string, attrs ...core.KeyValue)

AddEvent does nothing.

func (NoopSpan) AddEventWithTimestamp 

func (NoopSpan) AddEventWithTimestamp(ctx context.Context, timestamp time.Time, name string, attrs ...core.KeyValue)

AddEventWithTimestamp does nothing.

func (NoopSpan) End 

func (NoopSpan) End(options ...EndOption)

End does nothing.

func (NoopSpan) IsRecording 

func (NoopSpan) IsRecording() bool

IsRecording always returns false for NoopSpan.

func (NoopSpan) RecordError added in v0.2.3 

func (NoopSpan) RecordError(ctx context.Context, err error, opts ...ErrorOption)

RecordError does nothing.

func (NoopSpan) SetAttributes 

func (NoopSpan) SetAttributes(attributes ...core.KeyValue)

SetAttributes does nothing.

func (NoopSpan) SetError 

func (NoopSpan) SetError(v bool)

SetError does nothing.

func (NoopSpan) SetName 

func (NoopSpan) SetName(name string)

SetName does nothing.

func (NoopSpan) SetStatus 

func (NoopSpan) SetStatus(status codes.Code, msg string)

SetStatus does nothing.

func (NoopSpan) SpanContext 

func (NoopSpan) SpanContext() core.SpanContext

SpanContext returns an invalid span context.

func (NoopSpan) Tracer 

func (NoopSpan) Tracer() Tracer

Tracer returns noop implementation of Tracer.

type NoopTracer 

type NoopTracer struct{}

func (NoopTracer) Start 

func (NoopTracer) Start(ctx context.Context, name string, opts ...StartOption) (context.Context, Span)

Start starts a noop span.

func (NoopTracer) WithSpan 

func (t NoopTracer) WithSpan(ctx context.Context, name string, body func(context.Context) error, opts ...StartOption) error

WithSpan wraps around execution of func with noop span.

type Provider 

type Provider interface {
	// Tracer creates a named tracer that implements Tracer interface.
	// If the name is an empty string then provider uses default name.
	Tracer(name string) Tracer
}

type Sampler 

type Sampler interface {
	// ShouldSample returns a Decision that contains a decision whether to sample
	// or not sample the span to be created. Decision is based on a Sampler specific
	// algorithm that takes into account one or more input parameters.
	ShouldSample(
		sc core.SpanContext,
		remote bool,
		traceID core.TraceID,
		spanID core.SpanID,
		spanName string,
		spanKind SpanKind,
		attributes []core.KeyValue,
		links []Link,
	) Decision

	// Description returns of the sampler. It contains its name or short description
	// and its configured properties.
	// For example 'ProbabilitySampler:{0.00001}'
	Description() string
}

func AlwaysOffSampler added in v0.3.0 

func AlwaysOffSampler() Sampler

func AlwaysOnSampler added in v0.3.0 

func AlwaysOnSampler() Sampler

type Span 

type Span interface {
	// Tracer returns tracer used to create this span. Tracer cannot be nil.
	Tracer() Tracer

	// End completes the span. No updates are allowed to span after it
	// ends. The only exception is setting status of the span.
	End(options ...EndOption)

	// AddEvent adds an event to the span.
	AddEvent(ctx context.Context, name string, attrs ...core.KeyValue)
	// AddEventWithTimestamp adds an event with a custom timestamp
	// to the span.
	AddEventWithTimestamp(ctx context.Context, timestamp time.Time, name string, attrs ...core.KeyValue)

	// IsRecording returns true if the span is active and recording events is enabled.
	IsRecording() bool

	// RecordError records an error as a span event.
	RecordError(ctx context.Context, err error, opts ...ErrorOption)

	// SpanContext returns span context of the span. Returned SpanContext is usable
	// even after the span ends.
	SpanContext() core.SpanContext

	// SetStatus sets the status of the span in the form of a code
	// and a message.  SetStatus overrides the value of previous
	// calls to SetStatus on the Span.
	//
	// The default span status is OK, so it is not necessary to
	// explicitly set an OK status on successful Spans unless it
	// is to add an OK message or to override a previous status on the Span.
	SetStatus(codes.Code, string)

	// SetName sets the name of the span.
	SetName(name string)

	// Set span attributes
	SetAttributes(...core.KeyValue)
}

func SpanFromContext added in v0.2.1 

func SpanFromContext(ctx context.Context) Span

SpanFromContext returns the current span stored in the context.

type SpanKind 

type SpanKind int

SpanKind represents the role of a Span inside a Trace. Often, this defines how a Span will be processed and visualized by various backends. 

const (
	// As a convenience, these match the proto definition, see
	// opentelemetry/proto/trace/v1/trace.proto
	//
	// The unspecified value is not a valid `SpanKind`.  Use
	// `ValidateSpanKind()` to coerce a span kind to a valid
	// value.
	SpanKindUnspecified SpanKind = 0
	SpanKindInternal    SpanKind = 1
	SpanKindServer      SpanKind = 2
	SpanKindClient      SpanKind = 3
	SpanKindProducer    SpanKind = 4
	SpanKindConsumer    SpanKind = 5
)

func ValidateSpanKind added in v0.1.1 

func ValidateSpanKind(spanKind SpanKind) SpanKind

ValidateSpanKind returns a valid span kind value. This will coerce invalid values into the default value, SpanKindInternal.

func (SpanKind) String added in v0.1.1 

func (sk SpanKind) String() string

String returns the specified name of the SpanKind in lower-case.

type StartConfig added in v0.2.1 

type StartConfig struct {
	Attributes []core.KeyValue
	StartTime  time.Time
	Links      []Link
	Record     bool
	NewRoot    bool
	SpanKind   SpanKind
}

StartConfig provides options to set properties of span at the time of starting a new span.

type StartOption added in v0.2.1 

type StartOption func(*StartConfig)

StartOption applies changes to StartConfig that sets options at span start time.

func LinkedTo 

func LinkedTo(sc core.SpanContext, attrs ...core.KeyValue) StartOption

LinkedTo allows instantiating a Span with initial Links.

func WithAttributes 

func WithAttributes(attrs ...core.KeyValue) StartOption

WithAttributes sets attributes to span. These attributes provides additional data about the span. Multiple `WithAttributes` options appends the attributes preserving the order.

func WithNewRoot added in v0.2.2 

func WithNewRoot() StartOption

WithNewRoot specifies that the current span or remote span context in context passed to `Start` should be ignored when deciding about a parent, which effectively means creating a span with new trace ID. The current span and the remote span context may be added as links to the span by the implementation.

func WithRecord 

func WithRecord() StartOption

WithRecord specifies that the span should be recorded. Note that the implementation may still override this preference, e.g., if the span is a child in an unsampled trace.

func WithSpanKind 

func WithSpanKind(sk SpanKind) StartOption

WithSpanKind specifies the role a Span on a Trace.

func WithStartTime 

func WithStartTime(t time.Time) StartOption

WithStartTime sets the start time of the span to provided time t, when it is started. In absence of this option, wall clock time is used as start time. This option is typically used when starting of the span is delayed.

type TraceContext added in v0.2.2 

type TraceContext struct{}

TraceContext propagates SpanContext in W3C TraceContext format.

func (TraceContext) Extract added in v0.2.2 

func (tc TraceContext) Extract(ctx context.Context, supplier propagation.HTTPSupplier) context.Context

func (TraceContext) GetAllKeys added in v0.2.2 

func (TraceContext) GetAllKeys() []string

func (TraceContext) Inject added in v0.2.2 

func (TraceContext) Inject(ctx context.Context, supplier propagation.HTTPSupplier)

type Tracer 

type Tracer interface {
	// Start a span.
	Start(ctx context.Context, spanName string, opts ...StartOption) (context.Context, Span)

	// WithSpan wraps the execution of the fn function with a span.
	// It starts a new span, sets it as an active span in the context,
	// executes the fn function and closes the span before returning the result of fn.
	WithSpan(
		ctx context.Context,
		spanName string,
		fn func(ctx context.Context) error,
		opts ...StartOption,
	) error
}

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