langfuse

package module

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Versions in this module

v0

v0.6.0

Jul 24, 2026

Changes in this version

type Client

+ func (c *Client) WithBaggagePropagation(ctx context.Context) context.Context

+ func (c *Client) WithTraceAttributesFromBaggage(ctx context.Context) context.Context

type TraceAttributes

+ Environment string

v0.5.0

Jul 23, 2026

v0.4.0

Jul 21, 2026

Changes in this version

+ var ErrPromptNotFound = errors.New("langfuse: prompt not found")

+ var ErrPromptTypeMismatch = errors.New("langfuse: prompt type mismatch")

+ func TraceSampledAt(traceID string, fraction float64) (bool, error)

type Client

+ func (c *Client) GetPrompt(ctx context.Context, name string, query PromptQuery) (Prompt, error)

+ func (c *Client) WithSampleRate(ctx context.Context, fraction float64) context.Context

type Config

+ SampleRate *float64

type Observation

+ func (o *Observation) EndAt(at time.Time)

+ func (o *Observation) Sampled() bool

+ type Prompt struct

+ CommitMessage string

+ Config json.RawMessage

+ Labels []string

+ Messages []PromptMessage

+ Name string

+ Source PromptSource

+ Tags []string

+ Text string

+ Type PromptType

+ Version int

+ func (p Prompt) Compile(vars map[string]any) Prompt

+ func (p Prompt) CompileStrict(vars map[string]any) (Prompt, error)

+ func (p Prompt) DecodeConfig(v any) error

+ func (p Prompt) Ref() *PromptRef

+ type PromptFallback struct

+ Config json.RawMessage

+ Messages []PromptMessage

+ Text string

+ Type PromptType

+ type PromptMessage struct

+ Content string

+ Extra json.RawMessage

+ PlaceholderName string

+ Role string

+ type PromptQuery struct

+ CacheTTL time.Duration

+ DisableCache bool

+ Fallback *PromptFallback

+ Label string

+ Type PromptType

+ Version int

+ type PromptSource string

+ const PromptSourceCache

+ const PromptSourceFallback

+ const PromptSourceServer

+ const PromptSourceStale

+ type PromptType string

+ const PromptTypeChat

+ const PromptTypeText

type Score

+ ConfigID string

+ Timestamp time.Time

v0.2.0

Jul 20, 2026

v0.1.1

Jul 17, 2026

v0.1.0

Jul 17, 2026

Changes in this version

+ type Client struct

+ func New(ctx context.Context, cfg Config) (*Client, error)

+ func (c *Client) Event(ctx context.Context, name string, values ObservationAttributes)

+ func (c *Client) Flush(ctx context.Context) error

+ func (c *Client) Observe(ctx context.Context, name string, observationType ObservationType, ...) error

+ func (c *Client) RecordScore(ctx context.Context, score Score) error

+ func (c *Client) Shutdown(ctx context.Context) error

+ func (c *Client) StartObservation(ctx context.Context, name string, observationType ObservationType, ...) (context.Context, *Observation)

+ func (c *Client) WithTraceAttributes(ctx context.Context, values TraceAttributes) context.Context

+ type Config struct

+ BaseURL string

+ BlockOnQueueFull bool

+ DisableContentCapture bool

+ Disabled bool

+ Environment string

+ Mask func(value any) any

+ MaxQueueSize int

+ PublicKey string

+ Release string

+ SecretKey string

+ ServiceName string

+ TracerProvider *sdktrace.TracerProvider

+ func ConfigFromEnv() Config

+ type Level string

+ const LevelDebug

+ const LevelDefault

+ const LevelError

+ const LevelWarning

+ type Observation struct

+ func (o *Observation) End()

+ func (o *Observation) ID() string

+ func (o *Observation) RecordError(err error)

+ func (o *Observation) TraceID() string

+ func (o *Observation) Update(values ObservationAttributes)

+ type ObservationAttributes struct

+ CompletionStartTime time.Time

+ CostDetails map[string]float64

+ Input any

+ Level Level

+ Metadata map[string]any

+ Model string

+ ModelParameters map[string]any

+ Output any

+ Prompt *PromptRef

+ StartTime time.Time

+ StatusMessage string

+ Usage *Usage

+ Version string

+ type ObservationType string

+ const TypeAgent

+ const TypeChain

+ const TypeEmbedding

+ const TypeEvaluator

+ const TypeEvent

+ const TypeGeneration

+ const TypeGuardrail

+ const TypeRetriever

+ const TypeSpan

+ const TypeTool

+ type PromptRef struct

+ Name string

+ Version int

+ type Score struct

+ Comment string

+ DataType ScoreDataType

+ ID string

+ Metadata map[string]any

+ Name string

+ NumericValue *float64

+ ObservationID string

+ SessionID string

+ StringValue *string

+ TraceID string

+ type ScoreDataType string

+ const ScoreTypeBoolean

+ const ScoreTypeCategorical

+ const ScoreTypeCorrection

+ const ScoreTypeNumeric

+ const ScoreTypeText

+ type TraceAttributes struct

+ Metadata map[string]any

+ Name string

+ SessionID string

+ Tags []string

+ UserID string

+ Version string

+ type Usage struct

+ CacheCreationInputTokens int64

+ CacheReadInputTokens int64

+ Details map[string]int64

+ InputTokens int64

+ OutputTokens int64

+ ReasoningOutputTokens int64

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