Collect unclean shutdown debug information

components/browser_watcher/postmortem_report_collector.cc

Index: components/browser_watcher/postmortem_report_collector.cc
diff --git a/components/browser_watcher/postmortem_report_collector.cc b/components/browser_watcher/postmortem_report_collector.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f4fda553b2f4e9dc323c315487e5c16207e53ec9
--- /dev/null
+++ b/components/browser_watcher/postmortem_report_collector.cc
@@ -0,0 +1,182 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/browser_watcher/postmortem_report_collector.h"
+
+#include <utility>
+
+#include "base/debug/activity_analyzer.h"
+#include "base/files/file_enumerator.h"
+#include "base/files/file_util.h"
+#include "base/logging.h"
+#include "base/path_service.h"
+#include "components/browser_watcher/postmortem_minidump_writer.h"
+#include "third_party/crashpad/crashpad/client/settings.h"
+#include "third_party/crashpad/crashpad/util/misc/uuid.h"
+
+using base::FilePath;
+
+namespace browser_watcher {
+
+using base::debug::GlobalActivityAnalyzer;
+using base::debug::ThreadActivityAnalyzer;
+using crashpad::CrashReportDatabase;
+
+namespace {
+
+// An object that deletes a file when it goes out of scope.
+class FileDeleter {
+ public:
+  explicit FileDeleter(FilePath path) : file_path_(path) {}
+  ~FileDeleter() {
+    if (!base::DeleteFile(file_path_, false))
+      LOG(ERROR) << "Failed to delete " << file_path_.value();
+  }
+
+ private:
+  FilePath file_path_;
+};
+
+}  // namespace
+
+PostmortemReportCollector::PostmortemReportCollector(
+    const FilePath& debug_dir,
+    const FilePath::StringType& debug_file_pattern,
+    std::unique_ptr<crashpad::CrashReportDatabase> report_database)
+    : debug_state_dir_(debug_dir),
+      debug_file_pattern_(debug_file_pattern),
+      report_database_(std::move(report_database)) {
+  DCHECK_NE(true, debug_dir.empty());
+  DCHECK_NE(true, debug_file_pattern.empty());
+  DCHECK_NE(nullptr, report_database_.get());
+}
+
+// TODO(manzagop): throttling and graceful handling of too much data.
+void PostmortemReportCollector::CollectAndSubmitForUpload(
+    const std::set<FilePath>& excluded_debug_files) {
+  DCHECK_NE(nullptr, report_database_.get());
+
+  // Collect the list of files to harvest.
+  std::vector<FilePath> debug_files =
+      GetDebugStateFilePaths(excluded_debug_files);
+
+  // Determine the crashpad client id.
+  crashpad::UUID client_id;
+  crashpad::Settings* settings = report_database_->GetSettings();
+  if (settings) {
+    // If GetSettings() or GetClientID() fails client_id will be left at its
+    // default value, all zeroes, which is appropriate.
+    settings->GetClientID(&client_id);
+  }
+
+  // Note: the code below involves two notions of report:
+  //   - crashpad reports
+  //   - chrome internal state reports, which are reported wrapped inside a
+  //     crashpad report
+  for (const FilePath& file : debug_files) {
+    FileDeleter debug_file_deleter(file);
+
+    // Collect the data from the debug file to a proto.
+    std::unique_ptr<StabilityReport> report_proto = Collect(file);
+    if (!report_proto) {
+      // The file was empty, or there was an error collecting the data. Detailed
+      // logging happens within the Collect function.
+      continue;
+    }
+
+    // Prepare a crashpad report.
+    CrashReportDatabase::NewReport* new_report;
+    CrashReportDatabase::OperationStatus database_status =
+        report_database_->PrepareNewCrashReport(&new_report);
+    if (database_status != CrashReportDatabase::kNoError) {
+      // Note that we delete the report even in this case, to prevent report
+      // accumulation.
+      LOG(ERROR) << "PrepareNewCrashReport failed";
+      continue;
+    }
+    CrashReportDatabase::CallErrorWritingCrashReport
+        call_error_writing_crash_report(report_database_.get(), new_report);
+
+    // Write the report to a minidump.
+    if (!WriteReportToMinidump(*report_proto, client_id, new_report->uuid,
+                               reinterpret_cast<FILE*>(new_report->handle))) {
+      // Note that we delete the report even in this case, to prevent report
+      // accumulation. Detailed logging happens within the function.
+      continue;
+    }
+
+    // Finalize the report wrt the report database.
+    call_error_writing_crash_report.Disarm();
+    crashpad::UUID unused_report_id;
+    database_status = report_database_->FinishedWritingCrashReport(
+        new_report, &unused_report_id);
+    if (database_status != CrashReportDatabase::kNoError) {
+      // Note that we delete the report even in this case, to prevent report
+      // accumulation.
+      LOG(ERROR) << "FinishedWritingCrashReport failed";
+      continue;
+    }
+  }
+}
+
+PostmortemReportCollector::PostmortemReportCollector() {}
+
+std::vector<FilePath> PostmortemReportCollector::GetDebugStateFilePaths(
+    const std::set<FilePath>& excluded_debug_files) {
+  std::vector<FilePath> paths;
+  base::FileEnumerator enumerator(debug_state_dir_, false /* recursive */,
+                                  base::FileEnumerator::FILES,
+                                  debug_file_pattern_);
+  FilePath path;
+  for (path = enumerator.Next(); !path.empty(); path = enumerator.Next()) {
+    if (excluded_debug_files.find(path) == excluded_debug_files.end())
+      paths.push_back(path);
+  }
+  return paths;
+}
+
+std::unique_ptr<StabilityReport> PostmortemReportCollector::Collect(
+    const base::FilePath& debug_state_file) {
+  // Create a global analyzer.
+  std::unique_ptr<GlobalActivityAnalyzer> global_analyzer =
+      GlobalActivityAnalyzer::CreateWithFile(debug_state_file);
+  if (!global_analyzer)
+    return nullptr;
+
+  // Early exit if there is no data.
+  ThreadActivityAnalyzer* thread_analyzer = global_analyzer->GetFirstAnalyzer();
+  if (!thread_analyzer) {
+    // No data. This case happens in the case of a clean exit.
+    return nullptr;
+  }
+
+  // Iterate through the thread analyzers, fleshing out the report.
+  std::unique_ptr<StabilityReport> report(new StabilityReport());
+  ProcessState* process_state = report->add_process_states();
+
+  while (thread_analyzer) {
+    // Only valid analyzers are expected.
+    DCHECK(thread_analyzer->IsValid());
+
+    ThreadState* thread_state = process_state->add_threads();
+    thread_state->set_thread_name(thread_analyzer->GetThreadName());
+
+    // TODO(manzagop): flesh this out.
+
+    thread_analyzer = global_analyzer->GetNextAnalyzer();
+  }
+
+  return report;
+}
+
+bool PostmortemReportCollector::WriteReportToMinidump(
+    const StabilityReport& report,
+    const crashpad::UUID& client_id,
+    const crashpad::UUID& report_id,
+    FILE* minidump_file) {
+  PostmortemMinidumpWriter writer;
+  return writer.WriteDump(report, client_id, report_id, minidump_file);
+}
+
+}  // namespace browser_watcher