/*
 *
 * 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.
 *
 */

#include <grpc/grpc.h>

#include "src/core/channel/http_server_filter.h"
#include "src/core/iomgr/resolve_address.h"
#include "src/core/iomgr/tcp_server.h"
#include "src/core/surface/server.h"
#include "src/core/transport/chttp2_transport.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/useful.h>

static void
setup_transport (grpc_exec_ctx * exec_ctx, void *server, grpc_transport * transport, grpc_mdctx * mdctx)
{
  static grpc_channel_filter const *extra_filters[] = {
    &grpc_http_server_filter
  };
  grpc_server_setup_transport (server, transport, extra_filters, GPR_ARRAY_SIZE (extra_filters), mdctx, grpc_server_get_channel_args (server), closure_list);
}

static void
new_transport (grpc_exec_ctx * exec_ctx, void *server, grpc_endpoint * tcp)
{
  /*
   * Beware that the call to grpc_create_chttp2_transport() has to happen before
   * grpc_tcp_server_destroy(). This is fine here, but similar code
   * asynchronously doing a handshake instead of calling grpc_tcp_server_start()
   * (as in server_secure_chttp2.c) needs to add synchronization to avoid this
   * case.
   */
  grpc_mdctx *mdctx = grpc_mdctx_create ();
  grpc_transport *transport = grpc_create_chttp2_transport (grpc_server_get_channel_args (server), tcp, mdctx, 0, closure_list);
  setup_transport (server, transport, mdctx, closure_list);
  grpc_chttp2_transport_start_reading (transport, NULL, 0, closure_list);
}

/* Server callback: start listening on our ports */
static void
start (grpc_exec_ctx * exec_ctx, grpc_server * server, void *tcpp, grpc_pollset ** pollsets, size_t pollset_count)
{
  grpc_tcp_server *tcp = tcpp;
  grpc_tcp_server_start (tcp, pollsets, pollset_count, new_transport, server, closure_list);
}

/* Server callback: destroy the tcp listener (so we don't generate further
   callbacks) */
static void
destroy (grpc_exec_ctx * exec_ctx, grpc_server * server, void *tcpp, grpc_closure * destroy_done)
{
  grpc_tcp_server *tcp = tcpp;
  grpc_tcp_server_destroy (tcp, destroy_done, closure_list);
}

int
grpc_server_add_insecure_http2_port (grpc_server * server, const char *addr)
{
  grpc_resolved_addresses *resolved = NULL;
  grpc_tcp_server *tcp = NULL;
  size_t i;
  unsigned count = 0;
  int port_num = -1;
  int port_temp;
  grpc_closure_list closure_list = GRPC_CLOSURE_LIST_INIT;

  resolved = grpc_blocking_resolve_address (addr, "http");
  if (!resolved)
    {
      goto error;
    }

  tcp = grpc_tcp_server_create ();
  if (!tcp)
    {
      goto error;
    }

  for (i = 0; i < resolved->naddrs; i++)
    {
      port_temp = grpc_tcp_server_add_port (tcp, (struct sockaddr *) &resolved->addrs[i].addr, resolved->addrs[i].len);
      if (port_temp >= 0)
	{
	  if (port_num == -1)
	    {
	      port_num = port_temp;
	    }
	  else
	    {
	      GPR_ASSERT (port_num == port_temp);
	    }
	  count++;
	}
    }
  if (count == 0)
    {
      gpr_log (GPR_ERROR, "No address added out of total %d resolved", resolved->naddrs);
      goto error;
    }
  if (count != resolved->naddrs)
    {
      gpr_log (GPR_ERROR, "Only %d addresses added out of total %d resolved", count, resolved->naddrs);
    }
  grpc_resolved_addresses_destroy (resolved);

  /* Register with the server only upon success */
  grpc_server_add_listener (server, tcp, start, destroy, &closure_list);
  goto done;

/* Error path: cleanup and return */
error:
  if (resolved)
    {
      grpc_resolved_addresses_destroy (resolved);
    }
  if (tcp)
    {
      grpc_tcp_server_destroy (tcp, NULL, NULL);
    }
  port_num = 0;

done:
  grpc_closure_list_run (&closure_list);
  return port_num;
}