1 files changed, 146 insertions, 0 deletions
diff --git a/vendor/google.golang.org/grpc/stats/handlers.go b/vendor/google.golang.org/grpc/stats/handlers.go
new file mode 100644
index 0000000..ce47786
--- /dev/null
+++ b/vendor/google.golang.org/grpc/stats/handlers.go
@@ -0,0 +1,146 @@
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package stats
+
+import (
+	"net"
+	"sync/atomic"
+
+	"golang.org/x/net/context"
+	"google.golang.org/grpc/grpclog"
+)
+
+// ConnTagInfo defines the relevant information needed by connection context tagger.
+type ConnTagInfo struct {
+	// RemoteAddr is the remote address of the corresponding connection.
+	RemoteAddr net.Addr
+	// LocalAddr is the local address of the corresponding connection.
+	LocalAddr net.Addr
+	// TODO add QOS related fields.
+}
+
+// RPCTagInfo defines the relevant information needed by RPC context tagger.
+type RPCTagInfo struct {
+	// FullMethodName is the RPC method in the format of /package.service/method.
+	FullMethodName string
+}
+
+var (
+	on          = new(int32)
+	rpcHandler  func(context.Context, RPCStats)
+	connHandler func(context.Context, ConnStats)
+	connTagger  func(context.Context, *ConnTagInfo) context.Context
+	rpcTagger   func(context.Context, *RPCTagInfo) context.Context
+)
+
+// HandleRPC processes the RPC stats using the rpc handler registered by the user.
+func HandleRPC(ctx context.Context, s RPCStats) {
+	if rpcHandler == nil {
+		return
+	}
+	rpcHandler(ctx, s)
+}
+
+// RegisterRPCHandler registers the user handler function for RPC stats processing.
+// It should be called only once. The later call will overwrite the former value if it is called multiple times.
+// This handler function will be called to process the rpc stats.
+func RegisterRPCHandler(f func(context.Context, RPCStats)) {
+	rpcHandler = f
+}
+
+// HandleConn processes the stats using the call back function registered by user.
+func HandleConn(ctx context.Context, s ConnStats) {
+	if connHandler == nil {
+		return
+	}
+	connHandler(ctx, s)
+}
+
+// RegisterConnHandler registers the user handler function for conn stats.
+// It should be called only once. The later call will overwrite the former value if it is called multiple times.
+// This handler function will be called to process the conn stats.
+func RegisterConnHandler(f func(context.Context, ConnStats)) {
+	connHandler = f
+}
+
+// TagConn calls user registered connection context tagger.
+func TagConn(ctx context.Context, info *ConnTagInfo) context.Context {
+	if connTagger == nil {
+		return ctx
+	}
+	return connTagger(ctx, info)
+}
+
+// RegisterConnTagger registers the user connection context tagger function.
+// The connection context tagger can attach some information to the given context.
+// The returned context will be used for stats handling.
+// For conn stats handling, the context used in connHandler for this
+// connection will be derived from the context returned.
+// For RPC stats handling,
+//  - On server side, the context used in rpcHandler for all RPCs on this
+// connection will be derived from the context returned.
+//  - On client side, the context is not derived from the context returned.
+func RegisterConnTagger(t func(context.Context, *ConnTagInfo) context.Context) {
+	connTagger = t
+}
+
+// TagRPC calls the user registered RPC context tagger.
+func TagRPC(ctx context.Context, info *RPCTagInfo) context.Context {
+	if rpcTagger == nil {
+		return ctx
+	}
+	return rpcTagger(ctx, info)
+}
+
+// RegisterRPCTagger registers the user RPC context tagger function.
+// The RPC context tagger can attach some information to the given context.
+// The context used in stats rpcHandler for this RPC will be derived from the
+// context returned.
+func RegisterRPCTagger(t func(context.Context, *RPCTagInfo) context.Context) {
+	rpcTagger = t
+}
+
+// Start starts the stats collection and processing if there is a registered stats handle.
+func Start() {
+	if rpcHandler == nil && connHandler == nil {
+		grpclog.Println("rpcHandler and connHandler are both nil when starting stats. Stats is not started")
+		return
+	}
+	atomic.StoreInt32(on, 1)
+}
+
+// On indicates whether the stats collection and processing is on.
+func On() bool {
+	return atomic.CompareAndSwapInt32(on, 1, 1)
+}