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config.go
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config.go
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// 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 otelresty // import "github.com/dubonzi/otelresty"
import (
"github.com/go-resty/resty/v2"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/trace"
oteltrace "go.opentelemetry.io/otel/trace"
)
// defaultSkipper provides default behaviour, which won't skip span creation.
func defaultSkipper(*resty.Request) bool {
return false
}
func defaultSpanNameFormatter(_ string, req *resty.Request) string {
return "http " + req.Method
}
// config is used to configure the go-resty middleware.
type config struct {
TracerProvider oteltrace.TracerProvider
Propagators propagation.TextMapPropagator
SpanNameFormatter func(string, *resty.Request) string
SpanStartOptions []oteltrace.SpanStartOption
Skipper func(*resty.Request) bool
TracerName string
}
func newConfig(options ...Option) *config {
cfg := &config{
Propagators: otel.GetTextMapPropagator(),
TracerProvider: otel.GetTracerProvider(),
Skipper: defaultSkipper,
TracerName: tracerName,
SpanNameFormatter: defaultSpanNameFormatter,
}
defaultOpts := []Option{
WithSpanOptions(oteltrace.WithSpanKind(oteltrace.SpanKindClient)),
}
options = append(defaultOpts, options...)
for _, opt := range options {
opt.apply(cfg)
}
return cfg
}
// Option applies a configuration value.
type Option interface {
apply(*config)
}
type optionFunc func(*config)
func (o optionFunc) apply(c *config) {
o(c)
}
// WithSkipper specifies a skipper function to determine if the middleware
// should not create a span for a determined request. If not specified,
// a span will always be created.
func WithSkipper(skipper func(r *resty.Request) bool) Option {
return optionFunc(func(c *config) {
if skipper != nil {
c.Skipper = skipper
}
})
}
// 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
}
})
}
// WithSpanOptions configures an additional set of
// trace.SpanOptions, which are applied to each new span.
func WithSpanOptions(opts ...trace.SpanStartOption) Option {
return optionFunc(func(c *config) {
c.SpanStartOptions = append(c.SpanStartOptions, opts...)
})
}
// WithSpanNameFormatter takes a function that will be called on every
// request and the returned string will become the Span Name.
func WithSpanNameFormatter(f func(operation string, r *resty.Request) string) Option {
return optionFunc(func(c *config) {
c.SpanNameFormatter = f
})
}
// WithTracerName sets the name of the tracer used to create spans. The
// default value is "github.com/dubonzi/otelresty".
func WithTracerName(name string) Option {
return optionFunc(func(c *config) {
c.TracerName = name
})
}