mirror of
https://github.com/mozilla/gecko-dev.git
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105 lines
3.3 KiB
C++
105 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "MMPrinter.h"
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#include "jsapi.h"
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#include "nsJSUtils.h"
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#include "Logging.h"
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#include "mozilla/Bootstrap.h"
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#include "mozilla/dom/ipc/StructuredCloneData.h"
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#include "mozilla/dom/ScriptSettings.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/RandomNum.h"
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#include "nsFrameMessageManager.h"
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#include "prenv.h"
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namespace mozilla::dom {
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LazyLogModule MMPrinter::sMMLog("MessageManager");
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// You can use
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// https://gist.github.com/tomrittervg/adb8688426a9a5340da96004e2c8af79 to parse
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// the output of the logs into logs more friendly to reading.
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/* static */
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Maybe<uint64_t> MMPrinter::PrintHeader(char const* aLocation,
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const nsAString& aMsg) {
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NS_ConvertUTF16toUTF8 charMsg(aMsg);
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/*
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* The topic will be skipped if the topic name appears anywhere as a substring
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* of the filter.
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*
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* Example:
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* MOZ_LOG_MESSAGEMANAGER_SKIP="foobar|extension"
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* Will match the topics 'foobar', 'foo', 'bar', and 'ten' (even though
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* you may not have intended to match the latter three) and it will not match
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* the topics 'extensionresult' or 'Foo'.
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*/
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char* mmSkipLog = PR_GetEnv("MOZ_LOG_MESSAGEMANAGER_SKIP");
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if (mmSkipLog && strstr(mmSkipLog, charMsg.get())) {
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return Nothing();
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}
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uint64_t aMsgId = RandomUint64OrDie();
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MOZ_LOG(MMPrinter::sMMLog, LogLevel::Debug,
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("%" PRIu64 " %s Message: %s in process type: %s", aMsgId, aLocation,
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charMsg.get(), XRE_GetProcessTypeString()));
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return Some(aMsgId);
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}
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/* static */
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void MMPrinter::PrintNoData(uint64_t aMsgId) {
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if (!MOZ_LOG_TEST(sMMLog, LogLevel::Verbose)) {
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return;
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}
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MOZ_LOG(MMPrinter::sMMLog, LogLevel::Verbose,
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("%" PRIu64 " (No Data)", aMsgId));
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}
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/* static */
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void MMPrinter::PrintData(uint64_t aMsgId, ClonedMessageData const& aData) {
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if (!MOZ_LOG_TEST(sMMLog, LogLevel::Verbose)) {
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return;
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}
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ErrorResult rv;
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AutoJSAPI jsapi;
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// We're using this context to deserialize, stringify, and print a message
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// manager message here. Since the messages are always sent from and to system
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// scopes, we need to do this in a system scope, or attempting to deserialize
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// certain privileged objects will fail.
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MOZ_ALWAYS_TRUE(jsapi.Init(xpc::PrivilegedJunkScope()));
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JSContext* cx = jsapi.cx();
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ipc::StructuredCloneData data;
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ipc::UnpackClonedMessageData(aData, data);
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/* Read original StructuredCloneData. */
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JS::Rooted<JS::Value> scdContent(cx);
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data.Read(cx, &scdContent, rv);
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if (rv.Failed()) {
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// In testing, the only reason this would fail was if there was no data in
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// the message; so it seems like this is safe-ish.
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MMPrinter::PrintNoData(aMsgId);
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rv.SuppressException();
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return;
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}
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JS::Rooted<JSString*> unevalObj(cx, JS_ValueToSource(cx, scdContent));
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nsAutoJSString srcString;
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if (!srcString.init(cx, unevalObj)) return;
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MOZ_LOG(MMPrinter::sMMLog, LogLevel::Verbose,
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("%" PRIu64 " %s", aMsgId, NS_ConvertUTF16toUTF8(srcString).get()));
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}
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} // namespace mozilla::dom
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