traefik/pkg/server/middleware/plugins.go

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package middleware
import (
"context"
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"errors"
"net/http"
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"github.com/traefik/traefik/v3/pkg/config/dynamic"
"github.com/traefik/traefik/v3/pkg/plugins"
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"go.opentelemetry.io/otel/trace"
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)
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const typeName = "Plugin"
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// PluginsBuilder the plugin's builder interface.
type PluginsBuilder interface {
Build(pName string, config map[string]interface{}, middlewareName string) (plugins.Constructor, error)
}
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func findPluginConfig(rawConfig map[string]dynamic.PluginConf) (string, map[string]interface{}, error) {
if len(rawConfig) != 1 {
return "", nil, errors.New("invalid configuration: no configuration or too many plugin definition")
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}
var pluginType string
var rawPluginConfig map[string]interface{}
for pType, pConfig := range rawConfig {
pluginType = pType
rawPluginConfig = pConfig
}
if pluginType == "" {
return "", nil, errors.New("missing plugin type")
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}
return pluginType, rawPluginConfig, nil
}
type traceablePlugin struct {
name string
h http.Handler
}
func newTraceablePlugin(ctx context.Context, name string, plug plugins.Constructor, next http.Handler) (*traceablePlugin, error) {
h, err := plug(ctx, next)
if err != nil {
return nil, err
}
return &traceablePlugin{name: name, h: h}, nil
}
func (s *traceablePlugin) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
s.h.ServeHTTP(rw, req)
}
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func (s *traceablePlugin) GetTracingInformation() (string, string, trace.SpanKind) {
return s.name, typeName, trace.SpanKindInternal
}