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registry.go
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registry.go
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package middleware
import (
"errors"
"github.com/limes-cloud/gateway/config"
"strings"
"github.com/go-kratos/kratos/v2/log"
"github.com/prometheus/client_golang/prometheus"
)
var LOG = log.NewHelper(log.With(log.GetLogger(), "source", "middleware"))
var globalRegistry = NewRegistry()
var _failedMiddlewareCreate = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: "go",
Subsystem: "gateway",
Name: "failed_middleware_create",
Help: "The total number of failed middleware create",
}, []string{"name", "required"})
func init() {
prometheus.MustRegister(_failedMiddlewareCreate)
}
// ErrNotFound is middleware not found.
var ErrNotFound = errors.New("Middleware has not been registered")
// Registry is the interface for callers to get registered middleware.
type Registry interface {
Register(name string, factory Factory)
RegisterV2(name string, factory FactoryV2)
Create(cfg *config.Middleware) (MiddlewareV2, error)
}
type middlewareRegistry struct {
middleware map[string]FactoryV2
}
// NewRegistry returns a new middleware registry.
func NewRegistry() Registry {
return &middlewareRegistry{
middleware: map[string]FactoryV2{},
}
}
// Register registers one middleware.
func (p *middlewareRegistry) Register(name string, factory Factory) {
p.middleware[createFullName(name)] = wrapFactory(factory)
}
func (p *middlewareRegistry) RegisterV2(name string, factory FactoryV2) {
p.middleware[createFullName(name)] = factory
}
// Create instantiates a middleware based on `cfg`.
func (p *middlewareRegistry) Create(cfg *config.Middleware) (MiddlewareV2, error) {
if method, ok := p.getMiddleware(createFullName(cfg.Name)); ok {
if cfg.Required {
// If the middleware is required, it must be created successfully.
instance, err := method(cfg)
if err != nil {
_failedMiddlewareCreate.WithLabelValues(cfg.Name, "true").Inc()
LOG.Errorw(log.DefaultMessageKey, "Failed to create required middleware", "reason", "create_required_middleware_failed", "name", cfg.Name, "error", err, "config", cfg)
return nil, err
}
return instance, nil
}
instance, err := method(cfg)
if err != nil {
_failedMiddlewareCreate.WithLabelValues(cfg.Name, "false").Inc()
LOG.Errorw(log.DefaultMessageKey, "Failed to create optional middleware", "reason", "create_optional_middleware_failed", "name", cfg.Name, "error", err, "config", cfg)
return EmptyMiddleware, nil
}
return instance, nil
}
return nil, ErrNotFound
}
func (p *middlewareRegistry) getMiddleware(name string) (FactoryV2, bool) {
nameLower := strings.ToLower(name)
middlewareFn, ok := p.middleware[nameLower]
if ok {
return middlewareFn, true
}
return nil, false
}
func createFullName(name string) string {
return strings.ToLower("gateway.middleware." + name)
}
// Register registers one middleware.
func Register(name string, factory Factory) {
globalRegistry.Register(name, factory)
}
// RegisterV2 registers one v2 middleware.
func RegisterV2(name string, factory FactoryV2) {
globalRegistry.RegisterV2(name, factory)
}
// Create instantiates a middleware based on `cfg`.
func Create(cfg *config.Middleware) (MiddlewareV2, error) {
return globalRegistry.Create(cfg)
}