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/*
*
* 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)
}
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