model

package
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 Go to latest Published: Jul 4, 2017 License: MIT Imports: 11 Imported by: 0

Documentation

Overview

Package model describes the internal data model for Trace and Span

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func DurationAsMicroseconds 

func DurationAsMicroseconds(d time.Duration) uint64

DurationAsMicroseconds converts time.Duration to microseconds, which is the format the Duration field is stored in the Span.

func EpochMicrosecondsAsTime 

func EpochMicrosecondsAsTime(ts uint64) time.Time

EpochMicrosecondsAsTime converts microseconds since epoch to time.Time value.

func HashCode 

func HashCode(o Hashable) (uint64, error)

HashCode calcualtes a FNV-1a hash code for a Hashable object.

func MicrosecondsAsDuration 

func MicrosecondsAsDuration(v uint64) time.Duration

MicrosecondsAsDuration converts duration in microseconds to time.Duration value.

func TimeAsEpochMicroseconds 

func TimeAsEpochMicroseconds(t time.Time) uint64

TimeAsEpochMicroseconds converts time.Time to microseconds since epoch, which is the format the StartTime field is stored in the Span.

Types 

type DependencyLink struct {
	Parent    string `json:"parent"`
	Child     string `json:"child"`
	CallCount uint64 `json:"callCount"`
}

DependencyLink shows dependencies between services

type Flags 

type Flags uint32

Flags is a bit map of flags for a span

func (Flags) IsDebug 

func (f Flags) IsDebug() bool

IsDebug returns true if the Flags denote debugging Debugging can be useful in testing tracing availability or correctness

func (Flags) IsSampled 

func (f Flags) IsSampled() bool

IsSampled returns true if the Flags denote sampling

func (*Flags) SetDebug 

func (f *Flags) SetDebug()

SetDebug set the Flags as sampled

func (*Flags) SetSampled 

func (f *Flags) SetSampled()

SetSampled sets the Flags as sampled

type Hashable 

type Hashable interface {
	Hash(w io.Writer) error
}

Hashable interface is for type that can participate in a hash computation by writing their data into io.Writer, which is usually an instance of hash.Hash.

type KeyValue 

type KeyValue struct {
	Key   string    `json:"key"`
	VType ValueType `json:"vType"`
	VStr  string    `json:"vStr,omitempty"`
	VNum  int64     `json:"vNum,omitempty"`
	VBlob []byte    `json:"vBlob,omitempty"`
}

KeyValue describes a tag or a log field that consists of a key and a typed value. Before accessing a value, the caller must check the type. Boolean and numeric values should be accessed via accessor methods Bool(), Int64(), and Float64().

This struct is designed to minimize heap allocations.

func Binary 

func Binary(key string, value []byte) KeyValue

Binary creates a Binary-typed KeyValue

func Bool 

func Bool(key string, value bool) KeyValue

Bool creates a Bool-typed KeyValue

func Float64 

func Float64(key string, value float64) KeyValue

Float64 creates a Float64-typed KeyValue

func Int64 

func Int64(key string, value int64) KeyValue

Int64 creates a Int64-typed KeyValue

func String 

func String(key string, value string) KeyValue

String creates a String-typed KeyValue

func (*KeyValue) AsString 

func (kv *KeyValue) AsString() string

AsString returns a potentially lossy string representation of the value.

func (*KeyValue) Binary 

func (kv *KeyValue) Binary() []byte

Binary returns the blob ([]byte) value stored in this KeyValue or nil if it stores a different type. The caller must check VType before using this method.

func (*KeyValue) Bool 

func (kv *KeyValue) Bool() bool

Bool returns the Boolean value stored in this KeyValue or false if it stores a different type. The caller must check VType before using this method.

func (*KeyValue) Equal 

func (kv *KeyValue) Equal(other *KeyValue) bool

Equal compares KeyValue object with another KeyValue.

func (*KeyValue) Float64 

func (kv *KeyValue) Float64() float64

Float64 returns the Float64 value stored in this KeyValue or 0 if it stores a different type. The caller must check VType before using this method.

func (KeyValue) Hash 

func (kv KeyValue) Hash(w io.Writer) error

Hash implements Hash from Hashable.

func (*KeyValue) Int64 

func (kv *KeyValue) Int64() int64

Int64 returns the Int64 value stored in this KeyValue or 0 if it stores a different type. The caller must check VType before using this method.

func (*KeyValue) IsLess 

func (kv *KeyValue) IsLess(two *KeyValue) bool

IsLess compares KeyValue object with another KeyValue. The order is based first on the keys, then on type, and finally on the value.

func (*KeyValue) Value 

func (kv *KeyValue) Value() interface{}

Value returns typed values stored in KeyValue as interface{}.

type KeyValues 

type KeyValues []KeyValue

KeyValues is a type alias that exposes convenience functions like Sort, FindByKey.

func (KeyValues) Equal 

func (kvs KeyValues) Equal(other KeyValues) bool

Equal compares KyValues with another list. Both lists must be already sorted.

func (KeyValues) FindByKey 

func (kvs KeyValues) FindByKey(key string) (KeyValue, bool)

FindByKey scans the list of key-values searching for the first one with the given key. Returns found tag and a boolean flag indicating if the search was successful.

func (KeyValues) Hash 

func (kvs KeyValues) Hash(w io.Writer) error

Hash implements Hash from Hashable.

func (KeyValues) Len 

func (kvs KeyValues) Len() int

func (KeyValues) Less 

func (kvs KeyValues) Less(i, j int) bool

func (KeyValues) Sort 

func (kvs KeyValues) Sort()

Sort does in-place sorting of KeyValues, then by value type, then by value.

func (KeyValues) Swap 

func (kvs KeyValues) Swap(i, j int)

type Log 

type Log struct {
	Timestamp time.Time  `json:"timestamp"`
	Fields    []KeyValue `json:"fields"`
}

Log describes a micro-log entry that consists of a timestamp and one or more key-value fields

type Process 

type Process struct {
	ServiceName string    `json:"serviceName"`
	Tags        KeyValues `json:"tags,omitempty"`
}

Process describes an instance of an application or service that emits tracing data.

func NewProcess 

func NewProcess(serviceName string, tags []KeyValue) *Process

NewProcess creates a new Process for given serviceName and tags. The tags are sorted in place and kept in the the same array/slice, in order to store the Process in a canonical form that is relied upon by the Equal and Hash functions.

func (*Process) Equal 

func (p *Process) Equal(other *Process) bool

Equal compares Process object with another Process.

func (*Process) Hash 

func (p *Process) Hash(w io.Writer) (err error)

Hash implements Hash from Hashable.

type Span 

type Span struct {
	TraceID       TraceID       `json:"traceID"`
	SpanID        SpanID        `json:"spanID"`
	ParentSpanID  SpanID        `json:"parentSpanID"`
	OperationName string        `json:"operationName"`
	References    []SpanRef     `json:"references,omitempty"`
	Flags         Flags         `json:"flags,omitempty"`
	StartTime     time.Time     `json:"startTime"`
	Duration      time.Duration `json:"duration"`
	Tags          KeyValues     `json:"tags,omitempty"`
	Logs          []Log         `json:"logs,omitempty"`
	Process       *Process      `json:"process"`
	Warnings      []string      `json:"warnings,omitempty"`
}

Span represents a unit of work in an application, such as an RPC, a database call, etc.

func (*Span) HasSpanKind 

func (s *Span) HasSpanKind(kind ext.SpanKindEnum) bool

HasSpanKind returns true if the span has a `span.kind` tag set to `kind`.

func (*Span) Hash 

func (s *Span) Hash(w io.Writer) (err error)

Hash implements Hash from Hashable.

func (*Span) IsRPCClient 

func (s *Span) IsRPCClient() bool

IsRPCClient returns true if the span represents a client side of an RPC, as indicated by the `span.kind` tag set to `client`.

func (*Span) IsRPCServer 

func (s *Span) IsRPCServer() bool

IsRPCServer returns true if the span represents a server side of an RPC, as indicated by the `span.kind` tag set to `server`.

func (*Span) NormalizeTimestamps 

func (s *Span) NormalizeTimestamps()

NormalizeTimestamps changes all timestamps in this span to UTC.

type SpanID 

type SpanID uint64

SpanID is a random 64bit identifier for a span

func SpanIDFromString 

func SpanIDFromString(s string) (SpanID, error)

SpanIDFromString creates a SpanID from a hexadecimal string

func (SpanID) MarshalText 

func (s SpanID) MarshalText() ([]byte, error)

MarshalText allows SpanID to serialize itself in JSON as a string.

func (SpanID) String 

func (s SpanID) String() string

func (*SpanID) UnmarshalText 

func (s *SpanID) UnmarshalText(text []byte) error

UnmarshalText allows SpanID to deserialize itself from a JSON string.

type SpanRef 

type SpanRef struct {
	RefType SpanRefType `json:"refType"`
	TraceID TraceID     `json:"traceID"`
	SpanID  SpanID      `json:"spanID"`
}

SpanRef describes a reference from one span to another

type SpanRefType 

type SpanRefType int

SpanRefType describes the type of a span reference 

const (
	// ChildOf span reference type describes a reference to a parent span
	// that depends on the response from the current (child) span
	ChildOf SpanRefType = iota

	// FollowsFrom span reference type describes a reference to a "parent" span
	// that does not depend on the response from the current (child) span
	FollowsFrom
)

func SpanRefTypeFromString 

func SpanRefTypeFromString(s string) (SpanRefType, error)

SpanRefTypeFromString converts a string into SpanRefType enum.

func (SpanRefType) MarshalText 

func (p SpanRefType) MarshalText() ([]byte, error)

MarshalText allows SpanRefType to serialize itself in JSON as a string.

func (SpanRefType) String 

func (p SpanRefType) String() string

func (*SpanRefType) UnmarshalText 

func (p *SpanRefType) UnmarshalText(text []byte) error

UnmarshalText allows SpanRefType to deserialize itself from a JSON string.

type Trace 

type Trace struct {
	Spans    []*Span  `json:"spans,omitempty"`
	Warnings []string `json:"warnings,omitempty"`
}

Trace is a directed acyclic graph of Spans

func (*Trace) FindSpanByID 

func (t *Trace) FindSpanByID(id SpanID) *Span

FindSpanByID looks for a span with given span ID and returns the first one it finds (search order is unspecified), or nil if no spans have that ID.

func (*Trace) NormalizeTimestamps 

func (t *Trace) NormalizeTimestamps()

NormalizeTimestamps changes all timestamps in this trace to UTC.

type TraceID 

type TraceID struct {
	Low  uint64 `json:"lo"`
	High uint64 `json:"hi"`
}

TraceID is a random 128bit identifier for a trace

func TraceIDFromString 

func TraceIDFromString(s string) (TraceID, error)

TraceIDFromString creates a TraceID from a hexadecimal string

func (TraceID) MarshalText 

func (t TraceID) MarshalText() ([]byte, error)

MarshalText allows TraceID to serialize itself in JSON as a string.

func (TraceID) String 

func (t TraceID) String() string

func (*TraceID) UnmarshalText 

func (t *TraceID) UnmarshalText(text []byte) error

UnmarshalText allows TraceID to deserialize itself from a JSON string.

type ValueType 

type ValueType int

ValueType describes the type of value contained in a KeyValue struct 

const (
	// StringType indicates the value is a unicode string
	StringType ValueType = iota
	// BoolType indicates the value is a Boolean encoded as int64 number 0 or 1
	BoolType
	// Int64Type indicates the value is an int64 number
	Int64Type
	// Float64Type indicates the value is a float64 number stored as int64
	Float64Type
	// BinaryType indicates the value is binary blob stored as a byte array
	BinaryType
)

func ValueTypeFromString 

func ValueTypeFromString(s string) (ValueType, error)

ValueTypeFromString converts a string into ValueType enum.

func (ValueType) MarshalText 

func (p ValueType) MarshalText() ([]byte, error)

MarshalText allows ValueType to serialize itself in JSON as a string.

func (ValueType) String 

func (p ValueType) String() string

func (*ValueType) UnmarshalText 

func (p *ValueType) UnmarshalText(text []byte) error

UnmarshalText allows ValueType to deserialize itself from a JSON string.

Source Files

View all Source files

Directories

Path Synopsis
Package adjuster contains various adjusters for model.Trace.
 Package adjuster contains various adjusters for model.Trace.
Package converter contains various utilities for converting model.Trace to/from other data modes, like Thrift, or UI JSON.
 Package converter contains various utilities for converting model.Trace to/from other data modes, like Thrift, or UI JSON.
json
Package json allows converting model.Trace to external JSON data model.
 Package json allows converting model.Trace to external JSON data model.
thrift
Package thrift allows converting model.Trace to/from various thrift models.
 Package thrift allows converting model.Trace to/from various thrift models.
thrift/jaeger
Package jaeger allows converting model.Trace to/from jaeger.thrift model.
 Package jaeger allows converting model.Trace to/from jaeger.thrift model.
thrift/zipkin
Package zipkin allows converting model.Trace to/from zipkin.thrift model.
 Package zipkin allows converting model.Trace to/from zipkin.thrift model.
Package json defines the external JSON representation for Jaeger traces.
 Package json defines the external JSON representation for Jaeger traces.

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