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package tracing
import (
"fmt"
"net/http"
)
// OperationNamer will return an operation name given an HTTP request.
type OperationNamer func(*http.Request) string
// The configuration for InjectCorrelationID.
type handlerConfig struct {
getOperationName OperationNamer
}
// HandlerOption will configure a correlation handler.
type HandlerOption func(*handlerConfig)
func applyHandlerOptions(opts []HandlerOption) handlerConfig {
config := handlerConfig{
getOperationName: func(req *http.Request) string {
// By default use `GET /x/y/z` for operation names
return fmt.Sprintf("%s %s", req.Method, req.URL.Path)
},
}
for _, v := range opts {
v(&config)
}
return config
}
// WithRouteIdentifier allows a RouteIdentifier attribute to be set in the handler.
// This value will appear in the traces.
func WithRouteIdentifier(routeIdentifier string) HandlerOption {
return func(config *handlerConfig) {
config.getOperationName = func(req *http.Request) string {
// Use `GET routeIdentifier` for operation names
return fmt.Sprintf("%s %s", req.Method, routeIdentifier)
}
}
}
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