media/mtransport/nriceresolverfake.cpp
author Lina Cambridge <lina@yakshaving.ninja>
Tue, 02 Apr 2019 18:49:21 +0000
changeset 467645 db20a3f4324ec9fc29bb21bda77672e7e7640529
parent 448966 6f3709b3878117466168c40affa7bca0b60cf75b
child 472073 e1993a1f09ac53cd1a04fdf6a87f8cad8e44f73e
permissions -rw-r--r--
Bug 1539104 - Add a way to detect supported storage connection operations. r=mak In retrospect, overloading `Connection::connectionReady` to mean "is ready _and_ supports this operation" wasn't a good idea. This commit reverts that change (cfd44c936a9b), and adds two new methods: * `Connection::operationSupported`, to check if a connection supports sync or async operations. This method is public. * `Connection::ensureOperationSupported`, that asserts or returns an error if the connection doesn't support an operation. This is private. `operationSupported` is used by callers like `Service::minimizeMemory` to detect if the connection supports sync operations, since both sync and async connections implement `mozIStorageConnection` now. Finally, some callers used `!mDBConn` to check if the connection was ready, while others used `connectionReady()`. This commit changes them to use the latter. Differential Revision: https://phabricator.services.mozilla.com/D24974

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

// Original author: ekr@rtfm.com

// Some of this code is cut-and-pasted from nICEr. Copyright is:

/*
Copyright (c) 2007, Adobe Systems, Incorporated
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 Adobe Systems, Network Resonance 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 "nspr.h"
#include "prnetdb.h"

#include "mozilla/Assertions.h"

extern "C" {
#include "nr_api.h"
#include "async_timer.h"
#include "nr_resolver.h"
#include "transport_addr.h"
}

#include "nriceresolverfake.h"
#include "nr_socket_prsock.h"

namespace mozilla {

NrIceResolverFake::NrIceResolverFake()
    : vtbl_(new nr_resolver_vtbl),
      addrs_(),
      delay_ms_(100),
      allocated_resolvers_(0) {
  vtbl_->destroy = &NrIceResolverFake::destroy;
  vtbl_->resolve = &NrIceResolverFake::resolve;
  vtbl_->cancel = &NrIceResolverFake::cancel;
}

NrIceResolverFake::~NrIceResolverFake() {
  MOZ_ASSERT(allocated_resolvers_ == 0);
  delete vtbl_;
}

nr_resolver *NrIceResolverFake::AllocateResolver() {
  nr_resolver *resolver;

  int r = nr_resolver_create_int((void *)this, vtbl_, &resolver);
  MOZ_ASSERT(!r);
  if (r) return nullptr;

  ++allocated_resolvers_;

  return resolver;
}

void NrIceResolverFake::DestroyResolver() { --allocated_resolvers_; }

int NrIceResolverFake::destroy(void **objp) {
  if (!objp || !*objp) return 0;

  NrIceResolverFake *fake = static_cast<NrIceResolverFake *>(*objp);
  *objp = nullptr;

  fake->DestroyResolver();

  return 0;
}

int NrIceResolverFake::resolve(void *obj, nr_resolver_resource *resource,
                               int (*cb)(void *cb_arg, nr_transport_addr *addr),
                               void *cb_arg, void **handle) {
  int r, _status;

  MOZ_ASSERT(obj);
  NrIceResolverFake *fake = static_cast<NrIceResolverFake *>(obj);

  MOZ_ASSERT(fake->allocated_resolvers_ > 0);

  PendingResolution *pending = new PendingResolution(
      fake, resource->domain_name, resource->port ? resource->port : 3478,
      resource->transport_protocol ? resource->transport_protocol : IPPROTO_UDP,
      resource->address_family, cb, cb_arg);

  if ((r = NR_ASYNC_TIMER_SET(fake->delay_ms_, NrIceResolverFake::resolve_cb,
                              (void *)pending, &pending->timer_handle_))) {
    delete pending;
    ABORT(r);
  }
  *handle = pending;

  _status = 0;
abort:
  return (_status);
}

void NrIceResolverFake::resolve_cb(NR_SOCKET s, int how, void *cb_arg) {
  MOZ_ASSERT(cb_arg);
  PendingResolution *pending = static_cast<PendingResolution *>(cb_arg);

  const PRNetAddr *addr =
      pending->resolver_->Resolve(pending->hostname_, pending->address_family_);

  if (addr) {
    nr_transport_addr transport_addr;

    int r = nr_praddr_to_transport_addr(addr, &transport_addr,
                                        pending->transport_, 0);
    MOZ_ASSERT(!r);
    if (r) goto abort;

    r = nr_transport_addr_set_port(&transport_addr, pending->port_);
    MOZ_ASSERT(!r);
    if (r) goto abort;

    /* Fill in the address string */
    r = nr_transport_addr_fmt_addr_string(&transport_addr);
    MOZ_ASSERT(!r);
    if (r) goto abort;

    pending->cb_(pending->cb_arg_, &transport_addr);
    delete pending;
    return;
  }

abort:
  // Resolution failed.
  pending->cb_(pending->cb_arg_, nullptr);

  delete pending;
}

int NrIceResolverFake::cancel(void *obj, void *handle) {
  MOZ_ASSERT(obj);
  MOZ_ASSERT(static_cast<NrIceResolverFake *>(obj)->allocated_resolvers_ > 0);

  PendingResolution *pending = static_cast<PendingResolution *>(handle);

  NR_async_timer_cancel(pending->timer_handle_);
  delete pending;

  return (0);
}

}  // End of namespace mozilla