DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (b6d82b1a6b02)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */

#include "mozilla/DebugOnly.h"

#include "nscore.h"
#include "nsRequestObserverProxy.h"
#include "nsIRequest.h"
#include "nsAutoPtr.h"
#include "mozilla/Logging.h"
#include "mozilla/IntegerPrintfMacros.h"

namespace mozilla {
namespace net {

static LazyLogModule gRequestObserverProxyLog("nsRequestObserverProxy");

#undef LOG
#define LOG(args) MOZ_LOG(gRequestObserverProxyLog, LogLevel::Debug, args)

//-----------------------------------------------------------------------------
// nsARequestObserverEvent internal class...
//-----------------------------------------------------------------------------

nsARequestObserverEvent::nsARequestObserverEvent(nsIRequest* request)
    : Runnable("net::nsARequestObserverEvent"), mRequest(request) {
  MOZ_ASSERT(mRequest, "null pointer");
}

//-----------------------------------------------------------------------------
// nsOnStartRequestEvent internal class...
//-----------------------------------------------------------------------------

class nsOnStartRequestEvent : public nsARequestObserverEvent {
  RefPtr<nsRequestObserverProxy> mProxy;

 public:
  nsOnStartRequestEvent(nsRequestObserverProxy* proxy, nsIRequest* request)
      : nsARequestObserverEvent(request), mProxy(proxy) {
    MOZ_ASSERT(mProxy, "null pointer");
  }

  virtual ~nsOnStartRequestEvent() = default;

  NS_IMETHOD Run() override {
    LOG(("nsOnStartRequestEvent::HandleEvent [req=%p]\n", mRequest.get()));

    if (!mProxy->mObserver) {
      MOZ_ASSERT_UNREACHABLE(
          "already handled onStopRequest event "
          "(observer is null)");
      return NS_OK;
    }

    LOG(("handle startevent=%p\n", this));
    nsresult rv = mProxy->mObserver->OnStartRequest(mRequest);
    if (NS_FAILED(rv)) {
      LOG(("OnStartRequest failed [rv=%" PRIx32 "] canceling request!\n",
           static_cast<uint32_t>(rv)));
      rv = mRequest->Cancel(rv);
      NS_ASSERTION(NS_SUCCEEDED(rv), "Cancel failed for request!");
    }

    return NS_OK;
  }
};

//-----------------------------------------------------------------------------
// nsOnStopRequestEvent internal class...
//-----------------------------------------------------------------------------

class nsOnStopRequestEvent : public nsARequestObserverEvent {
  RefPtr<nsRequestObserverProxy> mProxy;

 public:
  nsOnStopRequestEvent(nsRequestObserverProxy* proxy, nsIRequest* request)
      : nsARequestObserverEvent(request), mProxy(proxy) {
    MOZ_ASSERT(mProxy, "null pointer");
  }

  virtual ~nsOnStopRequestEvent() = default;

  NS_IMETHOD Run() override {
    LOG(("nsOnStopRequestEvent::HandleEvent [req=%p]\n", mRequest.get()));

    nsMainThreadPtrHandle<nsIRequestObserver> observer = mProxy->mObserver;
    if (!observer) {
      MOZ_ASSERT_UNREACHABLE(
          "already handled onStopRequest event "
          "(observer is null)");
      return NS_OK;
    }
    // Do not allow any more events to be handled after OnStopRequest
    mProxy->mObserver = nullptr;

    nsresult status = NS_OK;
    DebugOnly<nsresult> rv = mRequest->GetStatus(&status);
    NS_ASSERTION(NS_SUCCEEDED(rv), "GetStatus failed for request!");

    LOG(("handle stopevent=%p\n", this));
    (void)observer->OnStopRequest(mRequest, status);

    return NS_OK;
  }
};

//-----------------------------------------------------------------------------
// nsRequestObserverProxy::nsISupports implementation...
//-----------------------------------------------------------------------------

NS_IMPL_ISUPPORTS(nsRequestObserverProxy, nsIRequestObserver,
                  nsIRequestObserverProxy)

//-----------------------------------------------------------------------------
// nsRequestObserverProxy::nsIRequestObserver implementation...
//-----------------------------------------------------------------------------

NS_IMETHODIMP
nsRequestObserverProxy::OnStartRequest(nsIRequest* request) {
  LOG(("nsRequestObserverProxy::OnStartRequest [this=%p req=%p]\n", this,
       request));

  nsOnStartRequestEvent* ev = new nsOnStartRequestEvent(this, request);
  if (!ev) return NS_ERROR_OUT_OF_MEMORY;

  LOG(("post startevent=%p\n", ev));
  nsresult rv = FireEvent(ev);
  if (NS_FAILED(rv)) delete ev;
  return rv;
}

NS_IMETHODIMP
nsRequestObserverProxy::OnStopRequest(nsIRequest* request, nsresult status) {
  LOG(("nsRequestObserverProxy: OnStopRequest [this=%p req=%p status=%" PRIx32
       "]\n",
       this, request, static_cast<uint32_t>(status)));

  // The status argument is ignored because, by the time the OnStopRequestEvent
  // is actually processed, the status of the request may have changed :-(
  // To make sure that an accurate status code is always used, GetStatus() is
  // called when the OnStopRequestEvent is actually processed (see above).

  nsOnStopRequestEvent* ev = new nsOnStopRequestEvent(this, request);
  if (!ev) return NS_ERROR_OUT_OF_MEMORY;

  LOG(("post stopevent=%p\n", ev));
  nsresult rv = FireEvent(ev);
  if (NS_FAILED(rv)) delete ev;
  return rv;
}

//-----------------------------------------------------------------------------
// nsRequestObserverProxy::nsIRequestObserverProxy implementation...
//-----------------------------------------------------------------------------

NS_IMETHODIMP
nsRequestObserverProxy::Init(nsIRequestObserver* observer,
                             nsISupports* context) {
  NS_ENSURE_ARG_POINTER(observer);
  mObserver = new nsMainThreadPtrHolder<nsIRequestObserver>(
      "nsRequestObserverProxy::mObserver", observer);
  mContext = new nsMainThreadPtrHolder<nsISupports>(
      "nsRequestObserverProxy::mContext", context);

  return NS_OK;
}

//-----------------------------------------------------------------------------
// nsRequestObserverProxy implementation...
//-----------------------------------------------------------------------------

nsresult nsRequestObserverProxy::FireEvent(nsARequestObserverEvent* event) {
  nsCOMPtr<nsIEventTarget> mainThread(GetMainThreadEventTarget());
  return mainThread->Dispatch(event, NS_DISPATCH_NORMAL);
}

}  // namespace net
}  // namespace mozilla