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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
// Based on https://github.com/DataDog/dd-trace-go/blob/8fb554ff7cf694267f9077ae35e27ce4689ed8b6/contrib/gin-gonic/gin/option.go
package otelgin // import "go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin"
import (
"net/http"
"github.com/gin-gonic/gin"
"go.opentelemetry.io/otel/propagation"
oteltrace "go.opentelemetry.io/otel/trace"
)
type config struct {
TracerProvider oteltrace.TracerProvider
Propagators propagation.TextMapPropagator
Filters []Filter
GinFilters []GinFilter
SpanNameFormatter SpanNameFormatter
}
// Filter is a predicate used to determine whether a given http.request should
// be traced. A Filter must return true if the request should be traced.
type Filter func(*http.Request) bool
// Adding new Filter parameter (*gin.Context)
// gin.Context has FullPath() method, which returns a matched route full path.
type GinFilter func(*gin.Context) bool
// SpanNameFormatter is used to set span name by http.request.
type SpanNameFormatter func(r *http.Request) string
// Option specifies instrumentation configuration options.
type Option interface {
apply(*config)
}
type optionFunc func(*config)
func (o optionFunc) apply(c *config) {
o(c)
}
// WithPropagators specifies propagators to use for extracting
// information from the HTTP requests. If none are specified, global
// ones will be used.
func WithPropagators(propagators propagation.TextMapPropagator) Option {
return optionFunc(func(cfg *config) {
if propagators != nil {
cfg.Propagators = propagators
}
})
}
// WithTracerProvider specifies a tracer provider to use for creating a tracer.
// If none is specified, the global provider is used.
func WithTracerProvider(provider oteltrace.TracerProvider) Option {
return optionFunc(func(cfg *config) {
if provider != nil {
cfg.TracerProvider = provider
}
})
}
// WithFilter adds a filter to the list of filters used by the handler.
// If any filter indicates to exclude a request then the request will not be
// traced. All gin and net/http filters must allow a request to be traced for a Span to be created.
// If no filters are provided then all requests are traced.
// Filters will be invoked for each processed request, it is advised to make them
// simple and fast.
func WithFilter(f ...Filter) Option {
return optionFunc(func(c *config) {
c.Filters = append(c.Filters, f...)
})
}
// WithGinFilter adds a gin filter to the list of filters used by the handler.
func WithGinFilter(f ...GinFilter) Option {
return optionFunc(func(c *config) {
c.GinFilters = append(c.GinFilters, f...)
})
}
// WithSpanNameFormatter takes a function that will be called on every
// request and the returned string will become the Span Name.
func WithSpanNameFormatter(f func(r *http.Request) string) Option {
return optionFunc(func(c *config) {
c.SpanNameFormatter = f
})
}
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