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middleware.go
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middleware.go
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package service
import (
"context"
log "github.com/go-kit/kit/log"
"github.com/emadghaffari/kit-blog/posts/pkg/grpc/pb"
model "github.com/emadghaffari/kit-blog/posts/pkg/model"
)
// Middleware describes a service middleware.
type Middleware func(PostsService) PostsService
type loggingMiddleware struct {
logger log.Logger
next PostsService
}
// LoggingMiddleware takes a logger as a dependency
// and returns a PostsService Middleware.
func LoggingMiddleware(logger log.Logger) Middleware {
return func(next PostsService) PostsService {
return &loggingMiddleware{logger, next}
}
}
func (l loggingMiddleware) Store(ctx context.Context, post model.Post) (response string, err error) {
defer func() {
l.logger.Log("method", "Store", "post", post, "response", response, "err", err)
}()
return l.next.Store(ctx, post)
}
func (l loggingMiddleware) Update(ctx context.Context, post model.Post) (response string, err error) {
defer func() {
l.logger.Log("method", "Update", "post", post, "response", response, "err", err)
}()
return l.next.Update(ctx, post)
}
func (l loggingMiddleware) List(ctx context.Context, post model.Post) (response []*pb.Post, err error) {
defer func() {
l.logger.Log("method", "List", "post", post, "response", response, "err", err)
}()
return l.next.List(ctx, post)
}
func (l loggingMiddleware) Delete(ctx context.Context, post model.Post) (response string, err error) {
defer func() {
l.logger.Log("method", "Delete", "post", post, "response", response, "err", err)
}()
return l.next.Delete(ctx, post)
}