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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package jaeger
import (
"fmt"
"github.com/opentracing/opentracing-go"
)
const (
// JaegerClientVersion is the version of the client library reported as Span tag.
JaegerClientVersion = "Go-2.20.0"
// JaegerClientVersionTagKey is the name of the tag used to report client version.
JaegerClientVersionTagKey = "jaeger.version"
// JaegerDebugHeader is the name of HTTP header or a TextMap carrier key which,
// if found in the carrier, forces the trace to be sampled as "debug" trace.
// The value of the header is recorded as the tag on the root span, so that the
// trace can be found in the UI using this value as a correlation ID.
JaegerDebugHeader = "jaeger-debug-id"
// JaegerBaggageHeader is the name of the HTTP header that is used to submit baggage.
// It differs from TraceBaggageHeaderPrefix in that it can be used only in cases where
// a root span does not exist.
JaegerBaggageHeader = "jaeger-baggage"
// TracerHostnameTagKey used to report host name of the process.
TracerHostnameTagKey = "hostname"
// TracerIPTagKey used to report ip of the process.
TracerIPTagKey = "ip"
// TracerUUIDTagKey used to report UUID of the client process.
TracerUUIDTagKey = "client-uuid"
// SamplerTypeTagKey reports which sampler was used on the root span.
SamplerTypeTagKey = "sampler.type"
// SamplerParamTagKey reports the parameter of the sampler, like sampling probability.
SamplerParamTagKey = "sampler.param"
// TraceContextHeaderName is the http header name used to propagate tracing context.
// This must be in lower-case to avoid mismatches when decoding incoming headers.
TraceContextHeaderName = "uber-trace-id"
// TracerStateHeaderName is deprecated.
// Deprecated: use TraceContextHeaderName
TracerStateHeaderName = TraceContextHeaderName
// TraceBaggageHeaderPrefix is the prefix for http headers used to propagate baggage.
// This must be in lower-case to avoid mismatches when decoding incoming headers.
TraceBaggageHeaderPrefix = "uberctx-"
// SamplerTypeConst is the type of sampler that always makes the same decision.
SamplerTypeConst = "const"
// SamplerTypeRemote is the type of sampler that polls Jaeger agent for sampling strategy.
SamplerTypeRemote = "remote"
// SamplerTypeProbabilistic is the type of sampler that samples traces
// with a certain fixed probability.
SamplerTypeProbabilistic = "probabilistic"
// SamplerTypeRateLimiting is the type of sampler that samples
// only up to a fixed number of traces per second.
SamplerTypeRateLimiting = "ratelimiting"
// SamplerTypeLowerBound is the type of sampler that samples
// at least a fixed number of traces per second.
SamplerTypeLowerBound = "lowerbound"
// DefaultUDPSpanServerHost is the default host to send the spans to, via UDP
DefaultUDPSpanServerHost = "localhost"
// DefaultUDPSpanServerPort is the default port to send the spans to, via UDP
DefaultUDPSpanServerPort = 6831
// DefaultSamplingServerPort is the default port to fetch sampling config from, via http
DefaultSamplingServerPort = 5778
// DefaultMaxTagValueLength is the default max length of byte array or string allowed in the tag value.
DefaultMaxTagValueLength = 256
// SelfRefType is a jaeger specific reference type that supports creating a span
// with an already defined context.
selfRefType opentracing.SpanReferenceType = 99
)
var (
// DefaultSamplingServerURL is the default url to fetch sampling config from, via http
DefaultSamplingServerURL = fmt.Sprintf("http://localhost:%d/sampling", DefaultSamplingServerPort)
)
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