/* * * Copyright 2015, 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. * */ #ifndef GRPC_CORE_EXT_CLIENT_CHANNEL_SUBCHANNEL_H #define GRPC_CORE_EXT_CLIENT_CHANNEL_SUBCHANNEL_H #include "src/core/ext/client_channel/connector.h" #include "src/core/lib/channel/channel_stack.h" #include "src/core/lib/iomgr/polling_entity.h" #include "src/core/lib/transport/connectivity_state.h" #include "src/core/lib/transport/metadata.h" // Channel arg containing a grpc_resolved_address to connect to. #define GRPC_ARG_SUBCHANNEL_ADDRESS "grpc.subchannel_address" /** A (sub-)channel that knows how to connect to exactly one target address. Provides a target for load balancing. */ typedef struct grpc_subchannel grpc_subchannel; typedef struct grpc_connected_subchannel grpc_connected_subchannel; typedef struct grpc_subchannel_call grpc_subchannel_call; typedef struct grpc_subchannel_args grpc_subchannel_args; #ifdef GRPC_STREAM_REFCOUNT_DEBUG #define GRPC_SUBCHANNEL_REF(p, r) \ grpc_subchannel_ref((p), __FILE__, __LINE__, (r)) #define GRPC_SUBCHANNEL_REF_FROM_WEAK_REF(p, r) \ grpc_subchannel_ref_from_weak_ref((p), __FILE__, __LINE__, (r)) #define GRPC_SUBCHANNEL_UNREF(cl, p, r) \ grpc_subchannel_unref((cl), (p), __FILE__, __LINE__, (r)) #define GRPC_SUBCHANNEL_WEAK_REF(p, r) \ grpc_subchannel_weak_ref((p), __FILE__, __LINE__, (r)) #define GRPC_SUBCHANNEL_WEAK_UNREF(cl, p, r) \ grpc_subchannel_weak_unref((cl), (p), __FILE__, __LINE__, (r)) #define GRPC_CONNECTED_SUBCHANNEL_REF(p, r) \ grpc_connected_subchannel_ref((p), __FILE__, __LINE__, (r)) #define GRPC_CONNECTED_SUBCHANNEL_UNREF(cl, p, r) \ grpc_connected_subchannel_unref((cl), (p), __FILE__, __LINE__, (r)) #define GRPC_SUBCHANNEL_CALL_REF(p, r) \ grpc_subchannel_call_ref((p), __FILE__, __LINE__, (r)) #define GRPC_SUBCHANNEL_CALL_UNREF(cl, p, r) \ grpc_subchannel_call_unref((cl), (p), __FILE__, __LINE__, (r)) #define GRPC_SUBCHANNEL_REF_EXTRA_ARGS \ , const char *file, int line, const char *reason #else #define GRPC_SUBCHANNEL_REF(p, r) grpc_subchannel_ref((p)) #define GRPC_SUBCHANNEL_REF_FROM_WEAK_REF(p, r) \ grpc_subchannel_ref_from_weak_ref((p)) #define GRPC_SUBCHANNEL_UNREF(cl, p, r) grpc_subchannel_unref((cl), (p)) #define GRPC_SUBCHANNEL_WEAK_REF(p, r) grpc_subchannel_weak_ref((p)) #define GRPC_SUBCHANNEL_WEAK_UNREF(cl, p, r) \ grpc_subchannel_weak_unref((cl), (p)) #define GRPC_CONNECTED_SUBCHANNEL_REF(p, r) grpc_connected_subchannel_ref((p)) #define GRPC_CONNECTED_SUBCHANNEL_UNREF(cl, p, r) \ grpc_connected_subchannel_unref((cl), (p)) #define GRPC_SUBCHANNEL_CALL_REF(p, r) grpc_subchannel_call_ref((p)) #define GRPC_SUBCHANNEL_CALL_UNREF(cl, p, r) \ grpc_subchannel_call_unref((cl), (p)) #define GRPC_SUBCHANNEL_REF_EXTRA_ARGS #endif grpc_subchannel *grpc_subchannel_ref( grpc_subchannel *channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS); grpc_subchannel *grpc_subchannel_ref_from_weak_ref( grpc_subchannel *channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS); void grpc_subchannel_unref(grpc_exec_ctx *exec_ctx, grpc_subchannel *channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS); grpc_subchannel *grpc_subchannel_weak_ref( grpc_subchannel *channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS); void grpc_subchannel_weak_unref(grpc_exec_ctx *exec_ctx, grpc_subchannel *channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS); grpc_connected_subchannel *grpc_connected_subchannel_ref( grpc_connected_subchannel *channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS); void grpc_connected_subchannel_unref(grpc_exec_ctx *exec_ctx, grpc_connected_subchannel *channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS); void grpc_subchannel_call_ref( grpc_subchannel_call *call GRPC_SUBCHANNEL_REF_EXTRA_ARGS); void grpc_subchannel_call_unref(grpc_exec_ctx *exec_ctx, grpc_subchannel_call *call GRPC_SUBCHANNEL_REF_EXTRA_ARGS); /** construct a subchannel call */ grpc_error *grpc_connected_subchannel_create_call( grpc_exec_ctx *exec_ctx, grpc_connected_subchannel *connected_subchannel, grpc_polling_entity *pollent, grpc_mdstr *path, gpr_timespec start_time, gpr_timespec deadline, grpc_subchannel_call **subchannel_call); /** process a transport level op */ void grpc_connected_subchannel_process_transport_op( grpc_exec_ctx *exec_ctx, grpc_connected_subchannel *subchannel, grpc_transport_op *op); /** poll the current connectivity state of a channel */ grpc_connectivity_state grpc_subchannel_check_connectivity( grpc_subchannel *channel, grpc_error **error); /** call notify when the connectivity state of a channel changes from *state. Updates *state with the new state of the channel */ void grpc_subchannel_notify_on_state_change( grpc_exec_ctx *exec_ctx, grpc_subchannel *channel, grpc_pollset_set *interested_parties, grpc_connectivity_state *state, grpc_closure *notify); void grpc_connected_subchannel_notify_on_state_change( grpc_exec_ctx *exec_ctx, grpc_connected_subchannel *channel, grpc_pollset_set *interested_parties, grpc_connectivity_state *state, grpc_closure *notify); void grpc_connected_subchannel_ping(grpc_exec_ctx *exec_ctx, grpc_connected_subchannel *channel, grpc_closure *notify); /** retrieve the grpc_connected_subchannel - or NULL if called before the subchannel becomes connected */ grpc_connected_subchannel *grpc_subchannel_get_connected_subchannel( grpc_subchannel *subchannel); /** continue processing a transport op */ void grpc_subchannel_call_process_op(grpc_exec_ctx *exec_ctx, grpc_subchannel_call *subchannel_call, grpc_transport_stream_op *op); /** continue querying for peer */ char *grpc_subchannel_call_get_peer(grpc_exec_ctx *exec_ctx, grpc_subchannel_call *subchannel_call); grpc_call_stack *grpc_subchannel_call_get_call_stack( grpc_subchannel_call *subchannel_call); struct grpc_subchannel_args { /* When updating this struct, also update subchannel_index.c */ /** Channel filters for this channel - wrapped factories will likely want to mutate this */ const grpc_channel_filter **filters; /** The number of filters in the above array */ size_t filter_count; /** Channel arguments to be supplied to the newly created channel */ const grpc_channel_args *args; }; /** create a subchannel given a connector */ grpc_subchannel *grpc_subchannel_create(grpc_exec_ctx *exec_ctx, grpc_connector *connector, const grpc_subchannel_args *args); /// Sets \a addr from \a args. void grpc_get_subchannel_address_arg(const grpc_channel_args *args, grpc_resolved_address *addr); /// Returns a new channel arg encoding the subchannel address as a string. /// Caller is responsible for freeing the string. grpc_arg grpc_create_subchannel_address_arg(const grpc_resolved_address *addr); #endif /* GRPC_CORE_EXT_CLIENT_CHANNEL_SUBCHANNEL_H */