Make mobile log per-host and rename as context

include/grpc/impl/codegen/grpc_types.h

@@ -332,7 +332,7 @@ typedef struct {
 #define GRPC_ARG_PER_RPC_RETRY_BUFFER_SIZE "grpc.per_rpc_retry_buffer_size"
 /** Channel arg that carries the bridged objective c object for custom metrics
  * logging filter. */
-#define GRPC_ARG_MOBILE_LOG_CONFIG "grpc.mobile_log_config"
+#define GRPC_ARG_MOBILE_LOG_CONTEXT "grpc.mobile_log_context"
 /** If non-zero, client authority filter is disabled for the channel */
 #define GRPC_ARG_DISABLE_CLIENT_AUTHORITY_FILTER \
   "grpc.disable_client_authority_filter"

src/objective-c/GRPCClient/GRPCCall+MobileLog.h

@@ -1,30 +0,0 @@
-/*
- *
- * Copyright 2017 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.
- *
- */
-
-#import "GRPCCall.h"
-
-@interface GRPCCall (MobileLog)
-// Set the object to be passed down along channel stack with channel arg
-// GRPC_ARG_MOBILE_LOG_CONFIG. The setting may be used by custom channel
-// filters for metrics logging.
-+ (void)setLogConfig:(id)logConfig;
-
-// Obtain the object to be passed down along channel stack with channel arg
-// GRPC_ARG_MOBILE_LOG_CONFIG.
-+ (id)logConfig;
-@end

src/objective-c/GRPCClient/GRPCCall+MobileLog.m

@@ -1,33 +0,0 @@
-/*
- *
- * Copyright 2017 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.
- *
- */
-
-#import "GRPCCall+MobileLog.h"
-
-static id globalLogConfig = nil;
-
-@implementation GRPCCall (MobileLog)
-
-+ (void)setLogConfig:(id)logConfig {
-  globalLogConfig = logConfig;
-}
-
-+ (id)logConfig {
-  return globalLogConfig;
-}
-
-@end

src/objective-c/GRPCClient/private/GRPCHost.h

@@ -37,6 +37,7 @@ struct grpc_channel_credentials;
 @property(nonatomic) grpc_compression_algorithm compressAlgorithm;
 @property(nonatomic) int keepaliveInterval;
 @property(nonatomic) int keepaliveTimeout;
+@property(nonatomic) id logContext;
 
 /** The following properties should only be modified for testing: */
 

src/objective-c/GRPCClient/private/GRPCHost.m

@@ -18,7 +18,6 @@
 
 #import "GRPCHost.h"
 
-#import <GRPCClient/GRPCCall+MobileLog.h>
 #import <GRPCClient/GRPCCall.h>
 #include <grpc/grpc.h>
 #include <grpc/grpc_security.h>
@@ -223,9 +222,9 @@ static NSMutableDictionary *kHostCache;
     args[@GRPC_ARG_KEEPALIVE_TIMEOUT_MS] = [NSNumber numberWithInt:_keepaliveTimeout];
   }
 
-  id logConfig = [GRPCCall logConfig];
-  if (logConfig != nil) {
-    args[@GRPC_ARG_MOBILE_LOG_CONFIG] = logConfig;
+  id logContext = self.logContext;
+  if (logContext != nil) {
+    args[@GRPC_ARG_MOBILE_LOG_CONTEXT] = logContext;
   }
 
   if (useCronet) {