add the cache service (#112)

cache/handler/cache.go

@@ -0,0 +1,90 @@
+package handler
+
+import (
+	"context"
+	"time"
+
+	"github.com/micro/micro/v3/service/errors"
+	pb "github.com/micro/services/cache/proto"
+	"github.com/micro/services/pkg/cache"
+)
+
+type Cache struct{}
+
+func (c *Cache) Get(ctx context.Context, req *pb.GetRequest, rsp *pb.GetResponse) error {
+	if len(req.Key) == 0 {
+		return errors.BadRequest("cache.get", "missing key")
+	}
+
+	item := new(pb.Item)
+	item.Key = req.Key
+
+	if err := cache.Context(ctx).Get(req.Key, item.Value); err != nil {
+		return errors.InternalServerError("cache.get", err.Error())
+	}
+
+	return nil
+}
+
+func (c *Cache) Set(ctx context.Context, req *pb.SetRequest, rsp *pb.SetResponse) error {
+	if len(req.Key) == 0 {
+		return errors.BadRequest("cache.get", "missing key")
+	}
+
+	ttl := time.Time{}
+
+	if req.Ttl > 0 {
+		ttl = time.Now().Add(time.Duration(req.Ttl) * time.Second)
+	}
+
+	if err := cache.Context(ctx).Set(req.Key, req.Value, ttl); err != nil {
+		return errors.InternalServerError("cache.set", err.Error())
+	}
+
+	return nil
+}
+
+func (c *Cache) Delete(ctx context.Context, req *pb.DeleteRequest, rsp *pb.DeleteResponse) error {
+	if len(req.Key) == 0 {
+		return errors.BadRequest("cache.get", "missing key")
+	}
+	if err := cache.Context(ctx).Delete(req.Key); err != nil {
+		return errors.InternalServerError("cache.delete", err.Error())
+	}
+	return nil
+}
+
+func (c *Cache) Increment(ctx context.Context, req *pb.IncrementRequest, rsp *pb.IncrementResponse) error {
+	if len(req.Key) == 0 {
+		return errors.BadRequest("cache.get", "missing key")
+	}
+
+	// increment the value
+	v, err := cache.Context(ctx).Increment(req.Key, req.Value)
+	if err != nil {
+		return errors.InternalServerError("cache.increment", err.Error())
+	}
+
+	// set the response value
+	rsp.Key = req.Key
+	rsp.Value = v
+
+	return nil
+}
+
+func (c *Cache) Decrement(ctx context.Context, req *pb.DecrementRequest, rsp *pb.DecrementResponse) error {
+	if len(req.Key) == 0 {
+		return errors.BadRequest("cache.get", "missing key")
+	}
+
+	v, err := cache.Context(ctx).Decrement(req.Key, req.Value)
+	if err != nil {
+		return errors.InternalServerError("cache.decrement", err.Error())
+	}
+
+	// set the response value
+	rsp.Key = req.Key
+	rsp.Value = v
+
+	return nil
+}