contacts: Add GoogleContactStore.

chrome/browser/chromeos/contacts/google_contact_store.cc

+// Copyright (c) 2012 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 "chrome/browser/chromeos/contacts/google_contact_store.h"
+
+#include <algorithm>
+
+#include "base/bind.h"
+#include "base/file_path.h"
+#include "base/logging.h"
+#include "chrome/browser/chromeos/contacts/contact.pb.h"
+#include "chrome/browser/chromeos/contacts/contact_database.h"
+#include "chrome/browser/chromeos/contacts/contact_store_observer.h"
+#include "chrome/browser/chromeos/gdata/gdata_contacts_service.h"
+#include "chrome/browser/chromeos/gdata/gdata_system_service.h"
+#include "chrome/browser/chromeos/gdata/gdata_util.h"
+#include "chrome/browser/profiles/profile.h"
+#include "content/public/browser/browser_thread.h"
+
+using content::BrowserThread;
+
+namespace contacts {
+
+namespace {
+
+// Name of the directory within the profile directory where the contact database
+// is stored.
+const FilePath::CharType kDatabaseDirectoryName[] =
+    FILE_PATH_LITERAL("Google Contacts");
+
+// We wait this long after the last update has completed successfully before
+// updating again.
+// TODO(derat): Decide what this should be.
+const int kUpdateIntervalSec = 600;
+
+// https://developers.google.com/google-apps/contacts/v3/index says that deleted
+// contact (groups?) will only be returned for 30 days after deletion when the
+// "showdeleted" parameter is set. If it's been longer than that since the last
+// successful update, we do a full refresh to make sure that we haven't missed
+// any deletions. Use 29 instead to make sure that we don't run afoul of
+// daylight saving time shenanigans or minor skew in the system clock.
+const int kForceFullUpdateDays = 29;
+
+// When an update fails, we initially wait this many seconds before retrying.
+// The delay increases exponentially in response to repeated failures.
+const int kUpdateFailureInitialRetrySec = 5;
+
+// Amount by which |update_delay_on_next_failure_| is multiplied on failure.
+const int kUpdateFailureBackoffFactor = 2;
+
+}  // namespace
+
+GoogleContactStore::TestAPI::TestAPI(GoogleContactStore* store)
+    : store_(store) {
+  DCHECK(store);
+}
+
+GoogleContactStore::TestAPI::~TestAPI() {
+  store_ = NULL;
+}
+
+void GoogleContactStore::TestAPI::SetDatabase(ContactDatabaseInterface* db) {
+  store_->DestroyDatabase();
+  store_->db_ = db;
+}
+
+void GoogleContactStore::TestAPI::SetGDataService(
+    gdata::GDataContactsServiceInterface* service) {
+  store_->gdata_service_for_testing_.reset(service);
+}
+
+void GoogleContactStore::TestAPI::DoUpdate() {
+  store_->UpdateContacts();
+}
+
+GoogleContactStore::GoogleContactStore(Profile* profile)
+    : profile_(profile),
+      contacts_deleter_(&contacts_),
+      db_(new ContactDatabase),
+      update_delay_on_next_failure_(
+          base::TimeDelta::FromSeconds(kUpdateFailureInitialRetrySec)),
+      ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+}
+
+GoogleContactStore::~GoogleContactStore() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  weak_ptr_factory_.InvalidateWeakPtrs();
+  DestroyDatabase();
+}
+
+void GoogleContactStore::Init() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  FilePath db_path = profile_->GetPath().Append(kDatabaseDirectoryName);
+  VLOG(1) << "Initializing contact database \"" << db_path.value() << "\" for "
+          << profile_->GetProfileName();
+  db_->Init(db_path,
+            base::Bind(&GoogleContactStore::OnDatabaseInitialized,
+                       weak_ptr_factory_.GetWeakPtr()));
+}
+
+void GoogleContactStore::AppendContacts(ContactPointers* contacts_out) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(contacts_out);
+  for (ContactMap::const_iterator it = contacts_.begin();
+       it != contacts_.end(); ++it) {
+    if (!it->second->deleted())
+      contacts_out->push_back(it->second);
+  }
+}
+
+const Contact* GoogleContactStore::GetContactByProviderId(
+    const std::string& provider_id) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  ContactMap::const_iterator it = contacts_.find(provider_id);
+  return (it != contacts_.end() && !it->second->deleted()) ? it->second : NULL;
+}
+
+void GoogleContactStore::AddObserver(ContactStoreObserver* observer) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(observer);
+  observers_.AddObserver(observer);
+}
+
+void GoogleContactStore::RemoveObserver(ContactStoreObserver* observer) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(observer);
+  observers_.RemoveObserver(observer);
+}
+
+base::Time GoogleContactStore::GetCurrentTime() const {
+  return !current_time_for_testing_.is_null() ?
+         current_time_for_testing_ :
+         base::Time::Now();
+}
+
+void GoogleContactStore::DestroyDatabase() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  if (db_) {
+    db_->DestroyOnUIThread();
+    db_ = NULL;
+  }
+}
+
+void GoogleContactStore::UpdateContacts() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  base::Time min_update_time;
+  base::TimeDelta time_since_last_update =
+      last_successful_update_start_time_.is_null() ?
+      base::TimeDelta() :
+      GetCurrentTime() - last_successful_update_start_time_;
+
+  if (!last_contact_update_time_.is_null() &&
+      time_since_last_update <
+      base::TimeDelta::FromDays(kForceFullUpdateDays)) {
+    // TODO(derat): I'm adding one millisecond to the last update time here as I
+    // don't want to re-download the same most-recently-updated contact each
+    // time, but what happens if within the same millisecond, contact A is
+    // updated, we do a sync, and then contact B is updated? I'm probably being
+    // overly paranoid about this.
+    min_update_time =
+        last_contact_update_time_ + base::TimeDelta::FromMilliseconds(1);
+  }
+  if (min_update_time.is_null()) {
+    VLOG(1) << "Downloading all contacts for " << profile_->GetProfileName();
+  } else {
+    VLOG(1) << "Downloading contacts updated since "
+            << gdata::util::FormatTimeAsString(min_update_time) << " for "
+            << profile_->GetProfileName();
+  }
+
+  gdata::GDataContactsServiceInterface* service =
+      gdata_service_for_testing_.get() ?
+      gdata_service_for_testing_.get() :
+      gdata::GDataSystemServiceFactory::GetForProfile(profile_)->
+          contacts_service();
+  DCHECK(service);
+  service->DownloadContacts(
+      base::Bind(&GoogleContactStore::OnDownloadSuccess,
+                 weak_ptr_factory_.GetWeakPtr(),
+                 min_update_time.is_null(),
+                 GetCurrentTime()),
+      base::Bind(&GoogleContactStore::OnDownloadFailure,
+                 weak_ptr_factory_.GetWeakPtr()),
+      min_update_time);
+}
+
+void GoogleContactStore::ScheduleUpdate(bool last_update_was_successful) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  base::TimeDelta delay;
+  if (last_update_was_successful) {
+    delay = base::TimeDelta::FromSeconds(kUpdateIntervalSec);
+    update_delay_on_next_failure_ =
+        base::TimeDelta::FromSeconds(kUpdateFailureInitialRetrySec);
+  } else {
+    delay = update_delay_on_next_failure_;
+    update_delay_on_next_failure_ = std::min(
+        update_delay_on_next_failure_ * kUpdateFailureBackoffFactor,
+        base::TimeDelta::FromSeconds(kUpdateIntervalSec));
+  }
+  VLOG(1) << "Scheduling update of " << profile_->GetProfileName()
+          << " in " << delay.InSeconds() << " second(s)";
+  update_timer_.Start(
+      FROM_HERE, delay, this, &GoogleContactStore::UpdateContacts);
+}
+
+void GoogleContactStore::MergeContacts(
+    bool is_full_update,
+    scoped_ptr<ScopedVector<Contact> > updated_contacts) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  if (is_full_update)
+    contacts_.clear();
+
+  for (ScopedVector<Contact>::iterator it = updated_contacts->begin();
+       it != updated_contacts->end(); ++it) {
+    Contact* contact = *it;
+    VLOG(1) << "Updating " << contact->provider_id();
+    ContactMap::iterator map_it = contacts_.find(contact->provider_id());
+    if (map_it == contacts_.end()) {
+      contacts_[contact->provider_id()] = contact;
+    } else {
+      delete map_it->second;
+      map_it->second = contact;
+    }
+  }
+
+  // Make sure that the Contact objects won't be destroyed when
+  // |updated_contacts| is destroyed.
+  size_t num_updated_contacts = updated_contacts->size();
+  updated_contacts->weak_clear();
+
+  if (is_full_update || num_updated_contacts > 0) {
+    // Find the latest update time.
+    last_contact_update_time_ = base::Time();
+    for (ContactMap::const_iterator it = contacts_.begin();
+         it != contacts_.end(); ++it) {
+      const Contact* contact = it->second;
+      base::Time update_time =
+          base::Time::FromInternalValue(contact->update_time());
+
+      if (!update_time.is_null() &&
+          (last_contact_update_time_.is_null() ||
+           last_contact_update_time_ < update_time)) {
+        last_contact_update_time_ = update_time;
+      }
+    }
+  }
+  VLOG(1) << "Last contact update time is "
+          << (last_contact_update_time_.is_null() ?
+              std::string("null") :
+              gdata::util::FormatTimeAsString(last_contact_update_time_));
+}
+
+void GoogleContactStore::OnDownloadSuccess(
+    bool is_full_update,
+    const base::Time& update_start_time,
+    scoped_ptr<ScopedVector<Contact> > updated_contacts) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  VLOG(1) << "Got " << updated_contacts->size() << " contact(s) for "
+          << profile_->GetProfileName();
+  size_t num_updated_contacts = updated_contacts->size();
+  MergeContacts(is_full_update, updated_contacts.Pass());
+  last_successful_update_start_time_ = update_start_time;
+
+  if (is_full_update || num_updated_contacts > 0) {
+    FOR_EACH_OBSERVER(ContactStoreObserver,
+                      observers_,
+                      OnContactsUpdated(this));
+  }
+
+  if (db_) {
+    scoped_ptr<ContactPointers> contacts_to_save(new ContactPointers);
+    for (ContactMap::const_iterator it = contacts_.begin();
+         it != contacts_.end(); ++it) {
+      contacts_to_save->push_back(it->second);
+    }
+    scoped_ptr<UpdateMetadata> metadata(new UpdateMetadata);
+    metadata->set_last_update_start_time(update_start_time.ToInternalValue());
+
+    db_->SaveContacts(
+        contacts_to_save.Pass(),
+        metadata.Pass(),
+        is_full_update,
+        base::Bind(&GoogleContactStore::OnDatabaseContactsSaved,
+                   weak_ptr_factory_.GetWeakPtr()));
+
+    // We'll schedule an update from OnDatabaseContactsSaved() after we're done
+    // writing to the database -- we don't want to modify the contacts while
+    // they're being used by the database.
+  } else {
+    ScheduleUpdate(true);
+  }
+}
+
+void GoogleContactStore::OnDownloadFailure() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  LOG(WARNING) << "Contacts download failed for " << profile_->GetProfileName();
+  ScheduleUpdate(false);
+}
+
+void GoogleContactStore::OnDatabaseInitialized(bool success) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  if (success) {
+    VLOG(1) << "Contact database initialized for "
+            << profile_->GetProfileName();
+    db_->LoadContacts(base::Bind(&GoogleContactStore::OnDatabaseContactsLoaded,
+                                 weak_ptr_factory_.GetWeakPtr()));
+  } else {
+    LOG(WARNING) << "Failed to initialize contact database for "
+                 << profile_->GetProfileName();
+    // Limp along as best as we can: throw away the database and do an update,
+    // which will schedule further updates.
+    DestroyDatabase();
+    UpdateContacts();
+  }
+}
+
+void GoogleContactStore::OnDatabaseContactsLoaded(
+    bool success,
+    scoped_ptr<ScopedVector<Contact> > contacts,
+    scoped_ptr<UpdateMetadata> metadata) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  if (success) {
+    VLOG(1) << "Loaded " << contacts->size() << " contact(s) from database";
+    MergeContacts(true, contacts.Pass());
+    last_successful_update_start_time_ =
+        base::Time::FromInternalValue(metadata->last_update_start_time());
+
+    if (!contacts_.empty()) {
+      FOR_EACH_OBSERVER(ContactStoreObserver,
+                        observers_,
+                        OnContactsUpdated(this));
+    }
+  } else {
+    LOG(WARNING) << "Failed to load contacts from database";
+  }
+  UpdateContacts();
+}
+
+void GoogleContactStore::OnDatabaseContactsSaved(bool success) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  if (!success)
+    LOG(WARNING) << "Failed to save contacts to database";
+
+  // We only update the database when we've successfully downloaded contacts, so
+  // report success to ScheduleUpdate() even if the database update failed.
+  ScheduleUpdate(true);
+}
+
+}  // namespace contacts