1 files changed, 104 insertions, 0 deletions

diff --git a/vendor/google.golang.org/grpc/codec.go b/vendor/google.golang.org/grpc/codec.go
new file mode 100644
index 0000000..905b048
--- /dev/null
+++ b/vendor/google.golang.org/grpc/codec.go
@@ -0,0 +1,104 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+        "math"
+        "sync"
+
+        "github.com/golang/protobuf/proto"
+)
+
+// Codec defines the interface gRPC uses to encode and decode messages.
+// Note that implementations of this interface must be thread safe;
+// a Codec's methods can be called from concurrent goroutines.
+type Codec interface {
+        // Marshal returns the wire format of v.
+        Marshal(v interface{}) ([]byte, error)
+        // Unmarshal parses the wire format into v.
+        Unmarshal(data []byte, v interface{}) error
+        // String returns the name of the Codec implementation. The returned
+        // string will be used as part of content type in transmission.
+        String() string
+}
+
+// protoCodec is a Codec implementation with protobuf. It is the default codec for gRPC.
+type protoCodec struct {
+}
+
+type cachedProtoBuffer struct {
+        lastMarshaledSize uint32
+        proto.Buffer
+}
+
+func capToMaxInt32(val int) uint32 {
+        if val > math.MaxInt32 {
+                return uint32(math.MaxInt32)
+        }
+        return uint32(val)
+}
+
+func (p protoCodec) marshal(v interface{}, cb *cachedProtoBuffer) ([]byte, error) {
+        protoMsg := v.(proto.Message)
+        newSlice := make([]byte, 0, cb.lastMarshaledSize)
+
+        cb.SetBuf(newSlice)
+        cb.Reset()
+        if err := cb.Marshal(protoMsg); err != nil {
+                return nil, err
+        }
+        out := cb.Bytes()
+        cb.lastMarshaledSize = capToMaxInt32(len(out))
+        return out, nil
+}
+
+func (p protoCodec) Marshal(v interface{}) ([]byte, error) {
+        cb := protoBufferPool.Get().(*cachedProtoBuffer)
+        out, err := p.marshal(v, cb)
+
+        // put back buffer and lose the ref to the slice
+        cb.SetBuf(nil)
+        protoBufferPool.Put(cb)
+        return out, err
+}
+
+func (p protoCodec) Unmarshal(data []byte, v interface{}) error {
+        cb := protoBufferPool.Get().(*cachedProtoBuffer)
+        cb.SetBuf(data)
+        v.(proto.Message).Reset()
+        err := cb.Unmarshal(v.(proto.Message))
+        cb.SetBuf(nil)
+        protoBufferPool.Put(cb)
+        return err
+}
+
+func (protoCodec) String() string {
+        return "proto"
+}
+
+var (
+        protoBufferPool = &sync.Pool{
+                New: func() interface{} {
+                        return &cachedProtoBuffer{
+                                Buffer:            proto.Buffer{},
+                                lastMarshaledSize: 16,
+                        }
+                },
+        }
+)