Servant.Tracing

Documentation

type ServantTracingT api m = (MonadIO m, MonadTracer m) => ServerT api m

Constrain the ServerT's base monad such that it provides an instance of MonadTracer

type WithTracing = Header "uber-trace-id" TracingInstructions

data TracingInstructions

Instructions that are specific to a single trace

Constructors

TracingInstructions

Fields

• traceId :: !TraceId
• spanId :: !SpanId
• parentSpanId :: !SpanId
• debug :: !Bool
• sample :: !Bool

Instances

Eq TracingInstructions

Methods

(==) :: TracingInstructions -> TracingInstructions -> Bool

(/=) :: TracingInstructions -> TracingInstructions -> Bool

Show TracingInstructions

Methods

showsPrec :: Int -> TracingInstructions -> ShowS

show :: TracingInstructions -> String

showList :: [TracingInstructions] -> ShowS

instructionsToHeader :: TracingInstructions -> Text

Jaeger format: http://jaeger.readthedocs.io/en/latest/client_libraries/#propagation-format This allows the trace backend to reassemble downstream traces.

getInstructions :: MonadIO m => Bool -> Maybe TracingInstructions -> m TracingInstructions

In the event that there are no TracingInstructions for this call, generate new instructions.

This has a

Orphan instances

FromHttpApiData TracingInstructions

Methods

parseUrlPiece :: Text -> Either Text TracingInstructions

parseHeader :: ByteString -> Either Text TracingInstructions

parseQueryParam :: Text -> Either Text TracingInstructions