src/core/client_config/subchannel_factory_decorators/merge_channel_args.c

/*
 *
 * Copyright 2015, Google Inc.
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 * 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
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 * 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
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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#include "src/core/client_config/subchannel_factory_decorators/merge_channel_args.h"
#include <grpc/support/alloc.h>
#include "src/core/channel/channel_args.h"

typedef struct
{
  grpc_subchannel_factory base;
  gpr_refcount refs;
  grpc_subchannel_factory *wrapped;
  grpc_channel_args *merge_args;
} merge_args_factory;

static void
merge_args_factory_ref (grpc_subchannel_factory * scf)
{
  merge_args_factory *f = (merge_args_factory *) scf;
  gpr_ref (&f->refs);
}

static void
merge_args_factory_unref (grpc_exec_ctx * exec_ctx, grpc_subchannel_factory * scf)
{
  merge_args_factory *f = (merge_args_factory *) scf;
  if (gpr_unref (&f->refs))
    {
      grpc_subchannel_factory_unref (exec_ctx, f->wrapped);
      grpc_channel_args_destroy (f->merge_args);
      gpr_free (f);
    }
}

static grpc_subchannel *
merge_args_factory_create_subchannel (grpc_exec_ctx * exec_ctx, grpc_subchannel_factory * scf, grpc_subchannel_args * args)
{
  merge_args_factory *f = (merge_args_factory *) scf;
  grpc_channel_args *final_args = grpc_channel_args_merge (args->args, f->merge_args);
  grpc_subchannel *s;
  args->args = final_args;
  s = grpc_subchannel_factory_create_subchannel (exec_ctx, f->wrapped, args);
  grpc_channel_args_destroy (final_args);
  return s;
}

static const grpc_subchannel_factory_vtable merge_args_factory_vtable = {
  merge_args_factory_ref, merge_args_factory_unref,
  merge_args_factory_create_subchannel
};

grpc_subchannel_factory *
grpc_subchannel_factory_merge_channel_args (grpc_subchannel_factory * input, const grpc_channel_args * args)
{
  merge_args_factory *f = gpr_malloc (sizeof (*f));
  f->base.vtable = &merge_args_factory_vtable;
  gpr_ref_init (&f->refs, 1);
  grpc_subchannel_factory_ref (input);
  f->wrapped = input;
  f->merge_args = grpc_channel_args_copy (args);
  return &f->base;
}