1 files changed, 141 insertions, 0 deletions

diff --git a/vendor/google.golang.org/grpc/metadata/metadata.go b/vendor/google.golang.org/grpc/metadata/metadata.go
new file mode 100644
index 0000000..be4f9e7
--- /dev/null
+++ b/vendor/google.golang.org/grpc/metadata/metadata.go
@@ -0,0 +1,141 @@
+/*
+ *
+ * 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 metadata define the structure of the metadata supported by gRPC library.
+// Please refer to https://grpc.io/docs/guides/wire.html for more information about custom-metadata.
+package metadata // import "google.golang.org/grpc/metadata"
+
+import (
+        "fmt"
+        "strings"
+
+        "golang.org/x/net/context"
+)
+
+// DecodeKeyValue returns k, v, nil.  It is deprecated and should not be used.
+func DecodeKeyValue(k, v string) (string, string, error) {
+        return k, v, nil
+}
+
+// MD is a mapping from metadata keys to values. Users should use the following
+// two convenience functions New and Pairs to generate MD.
+type MD map[string][]string
+
+// New creates an MD from a given key-value map.
+//
+// Only the following ASCII characters are allowed in keys:
+//  - digits: 0-9
+//  - uppercase letters: A-Z (normalized to lower)
+//  - lowercase letters: a-z
+//  - special characters: -_.
+// Uppercase letters are automatically converted to lowercase.
+func New(m map[string]string) MD {
+        md := MD{}
+        for k, val := range m {
+                key := strings.ToLower(k)
+                md[key] = append(md[key], val)
+        }
+        return md
+}
+
+// Pairs returns an MD formed by the mapping of key, value ...
+// Pairs panics if len(kv) is odd.
+//
+// Only the following ASCII characters are allowed in keys:
+//  - digits: 0-9
+//  - uppercase letters: A-Z (normalized to lower)
+//  - lowercase letters: a-z
+//  - special characters: -_.
+// Uppercase letters are automatically converted to lowercase.
+func Pairs(kv ...string) MD {
+        if len(kv)%2 == 1 {
+                panic(fmt.Sprintf("metadata: Pairs got the odd number of input pairs for metadata: %d", len(kv)))
+        }
+        md := MD{}
+        var key string
+        for i, s := range kv {
+                if i%2 == 0 {
+                        key = strings.ToLower(s)
+                        continue
+                }
+                md[key] = append(md[key], s)
+        }
+        return md
+}
+
+// Len returns the number of items in md.
+func (md MD) Len() int {
+        return len(md)
+}
+
+// Copy returns a copy of md.
+func (md MD) Copy() MD {
+        return Join(md)
+}
+
+// Join joins any number of mds into a single MD.
+// The order of values for each key is determined by the order in which
+// the mds containing those values are presented to Join.
+func Join(mds ...MD) MD {
+        out := MD{}
+        for _, md := range mds {
+                for k, v := range md {
+                        out[k] = append(out[k], v...)
+                }
+        }
+        return out
+}
+
+type mdIncomingKey struct{}
+type mdOutgoingKey struct{}
+
+// NewContext is a wrapper for NewOutgoingContext(ctx, md).  Deprecated.
+func NewContext(ctx context.Context, md MD) context.Context {
+        return NewOutgoingContext(ctx, md)
+}
+
+// NewIncomingContext creates a new context with incoming md attached.
+func NewIncomingContext(ctx context.Context, md MD) context.Context {
+        return context.WithValue(ctx, mdIncomingKey{}, md)
+}
+
+// NewOutgoingContext creates a new context with outgoing md attached.
+func NewOutgoingContext(ctx context.Context, md MD) context.Context {
+        return context.WithValue(ctx, mdOutgoingKey{}, md)
+}
+
+// FromContext is a wrapper for FromIncomingContext(ctx).  Deprecated.
+func FromContext(ctx context.Context) (md MD, ok bool) {
+        return FromIncomingContext(ctx)
+}
+
+// FromIncomingContext returns the incoming metadata in ctx if it exists.  The
+// returned MD should not be modified. Writing to it may cause races.
+// Modification should be made to copies of the returned MD.
+func FromIncomingContext(ctx context.Context) (md MD, ok bool) {
+        md, ok = ctx.Value(mdIncomingKey{}).(MD)
+        return
+}
+
+// FromOutgoingContext returns the outgoing metadata in ctx if it exists.  The
+// returned MD should not be modified. Writing to it may cause races.
+// Modification should be made to the copies of the returned MD.
+func FromOutgoingContext(ctx context.Context) (md MD, ok bool) {
+        md, ok = ctx.Value(mdOutgoingKey{}).(MD)
+        return
+}