Add cache example (#2232)

examples/cache/handler/cache.go

@@ -0,0 +1,60 @@
+package handler
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/asim/go-micro/v3/cache"
+	log "github.com/asim/go-micro/v3/logger"
+
+	pb "github.com/asim/go-micro/examples/v3/cache/proto"
+)
+
+type Cache struct {
+	cache cache.Cache
+}
+
+func NewCache(opts ...cache.Option) *Cache {
+	c := cache.NewCache(opts...)
+	return &Cache{c}
+}
+
+func (c *Cache) Get(ctx context.Context, req *pb.GetRequest, rsp *pb.GetResponse) error {
+	log.Infof("Received Cache.Get request: %v", req)
+
+	v, e, err := c.cache.Context(ctx).Get(req.Key)
+	if err != nil {
+		return err
+	}
+
+	rsp.Value = fmt.Sprintf("%v", v)
+	rsp.Expiration = e.String()
+
+	return nil
+}
+
+func (c *Cache) Put(ctx context.Context, req *pb.PutRequest, rsp *pb.PutResponse) error {
+	log.Infof("Received Cache.Put request: %v", req)
+
+	d, err := time.ParseDuration(req.Duration)
+	if err != nil {
+		return err
+	}
+
+	if err := c.cache.Context(ctx).Put(req.Key, req.Value, d); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *Cache) Delete(ctx context.Context, req *pb.DeleteRequest, rsp *pb.DeleteResponse) error {
+	log.Infof("Received Cache.Delete request: %v", req)
+
+	if err := c.cache.Context(ctx).Delete(req.Key); err != nil {
+		return err
+	}
+
+	return nil
+}