modem_manager.cc

// Copyright (c) 2012 The Chromium OS 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 "shill/modem_manager.h"

#include <algorithm>

#include <base/logging.h>
#include <base/stl_util.h>

#include "shill/async_call_handler.h"
#include "shill/modem.h"
#include "shill/modem_manager_proxy.h"
#include "shill/proxy_factory.h"

using std::string;
using std::tr1::shared_ptr;
using std::vector;

namespace shill {
ModemManager::ModemManager(const string &service,
                           const string &path,
                           ControlInterface *control_interface,
                           EventDispatcher *dispatcher,
                           Metrics *metrics,
                           Manager *manager,
                           GLib *glib,
                           mobile_provider_db *provider_db)
    : proxy_factory_(ProxyFactory::GetInstance()),
      service_(service),
      path_(path),
      watcher_id_(0),
      control_interface_(control_interface),
      dispatcher_(dispatcher),
      metrics_(metrics),
      manager_(manager),
      glib_(glib),
      provider_db_(provider_db) {}

ModemManager::~ModemManager() {
  Stop();
}

void ModemManager::Start() {
  LOG(INFO) << "Start watching modem manager service: " << service_;
  CHECK_EQ(0U, watcher_id_);
  // TODO(petkov): Implement DBus name watching through dbus-c++.
  watcher_id_ = glib_->BusWatchName(G_BUS_TYPE_SYSTEM,
                                    service_.c_str(),
                                    G_BUS_NAME_WATCHER_FLAGS_NONE,
                                    OnAppear,
                                    OnVanish,
                                    this,
                                    NULL);
}

void ModemManager::Stop() {
  LOG(INFO) << "Stop watching modem manager service: " << service_;
  if (watcher_id_) {
    glib_->BusUnwatchName(watcher_id_);
    watcher_id_ = 0;
  }
  Disconnect();
}

void ModemManager::Connect(const string &owner) {
  // Inheriting classes call this superclass method.
  owner_ = owner;
}

void ModemManager::Disconnect() {
  // Inheriting classes call this superclass method.
  modems_.clear();
  owner_.clear();
}

void ModemManager::OnAppear(GDBusConnection */*connection*/,
                            const gchar *name,
                            const gchar *name_owner,
                            gpointer user_data) {
  LOG(INFO) << "Modem manager " << name << " appeared. Owner: " << name_owner;
  ModemManager *manager = reinterpret_cast<ModemManager *>(user_data);
  manager->Connect(name_owner);
}

void ModemManager::OnVanish(GDBusConnection */*connection*/,
                            const gchar *name,
                            gpointer user_data) {
  LOG(INFO) << "Modem manager " << name << " vanished.";
  ModemManager *manager = reinterpret_cast<ModemManager *>(user_data);
  manager->Disconnect();
}

void ModemManager::AddModem(const string &path) {
  LOG(INFO) << "Add modem: " << path;
  CHECK(!owner_.empty());
  if (ContainsKey(modems_, path)) {
    LOG(INFO) << "Modem already exists; ignored.";
    return;
  }
  shared_ptr<Modem> modem(new Modem(owner_,
                                    path,
                                    control_interface_,
                                    dispatcher_,
                                    metrics_,
                                    manager_,
                                    provider_db_));
  modems_[path] = modem;
  InitModem(modem);
}

void ModemManager::RemoveModem(const string &path) {
  LOG(INFO) << "Remove modem: " << path;
  CHECK(!owner_.empty());
  modems_.erase(path);
}

void ModemManager::OnDeviceInfoAvailable(const string &link_name) {
  for (Modems::const_iterator it = modems_.begin(); it != modems_.end(); ++it) {
    it->second->OnDeviceInfoAvailable(link_name);
  }
}

// ModemManagerClassic
ModemManagerClassic::ModemManagerClassic(const string &service,
                                         const string &path,
                                         ControlInterface *control_interface,
                                         EventDispatcher *dispatcher,
                                         Metrics *metrics,
                                         Manager *manager,
                                         GLib *glib,
                                         mobile_provider_db *provider_db) :
    ModemManager(service,
                 path,
                 control_interface,
                 dispatcher,
                 metrics,
                 manager,
                 glib,
                 provider_db) {}

ModemManagerClassic::~ModemManagerClassic() {}

void ModemManagerClassic::Connect(const string &supplied_owner) {
  ModemManager::Connect(supplied_owner);
  proxy_.reset(proxy_factory()->CreateModemManagerProxy(this, path(), owner()));

  // TODO(petkov): Switch to asynchronous calls (crosbug.com/17583).
  vector<DBus::Path> devices = proxy_->EnumerateDevices();
  for (vector<DBus::Path>::const_iterator it = devices.begin();
       it != devices.end(); ++it) {
    AddModem(*it);
  }
}

void ModemManagerClassic::Disconnect() {
  ModemManager::Disconnect();
  proxy_.reset();
}

void ModemManagerClassic::InitModem(shared_ptr<Modem> modem) {
  modem->Init();
}

// ModemManager1
const char ModemManager1::kDBusInterfaceModem[] =
    "org.freedesktop.ModemManager1.Modem";

ModemManager1::ModemManager1(const string &service,
                             const string &path,
                             ControlInterface *control_interface,
                             EventDispatcher *dispatcher,
                             Metrics *metrics,
                             Manager *manager,
                             GLib *glib,
                             mobile_provider_db *provider_db) :
    ModemManager(service,
                 path,
                 control_interface,
                 dispatcher,
                 metrics,
                 manager,
                 glib,
                 provider_db) {}

ModemManager1::~ModemManager1() {}

void ModemManager1::Connect(const string &supplied_owner) {
  ModemManager::Connect(supplied_owner);
  proxy_.reset(
      proxy_factory()->CreateDBusObjectManagerProxy(this, path(), owner()));

  // TODO(rochberg):  Make global kDBusDefaultTimeout and use it here
  proxy_->GetManagedObjects(new AsyncCallHandler(NULL), 5000);
}

void ModemManager1::Disconnect() {
  ModemManager::Disconnect();
  proxy_.reset();
}

void ModemManager1::InitModem(shared_ptr<Modem> modem) {
  LOG(ERROR) << __func__;
}

// DBusObjectManagerProxyDelegate signal methods
// Also called by OnGetManagedObjectsCallback
void ModemManager1::OnInterfacesAdded(
    const ::DBus::Path &object_path,
    const DBusInterfaceToProperties &interface_to_properties) {
  if (ContainsKey(interface_to_properties, kDBusInterfaceModem)) {
    AddModem(object_path);
  } else {
    LOG(ERROR) << "Interfaces added, but not modem interface.";
  }
}

void ModemManager1::OnInterfacesRemoved(
    const ::DBus::Path &object_path,
    const vector<string> &interfaces) {
  LOG(INFO) << "MM1:  Removing interfaces from " << object_path;
  if (find(interfaces.begin(),
           interfaces.end(),
           kDBusInterfaceModem) != interfaces.end()) {
    RemoveModem(object_path);
  } else {
    // In theory, a modem could drop, say, 3GPP, but not CDMA.  In
    // practice, we don't expect this
    LOG(ERROR) << "Interfaces removed, but not modem interface";
  }
}

// DBusObjectManagerProxy async method call
void ModemManager1::OnGetManagedObjectsCallback(
    const DBusObjectsWithProperties &objects,
    const Error &error,
    AsyncCallHandler * /* call_handler */) {
  DBusObjectsWithProperties::const_iterator m;
  for (m = objects.begin(); m != objects.end(); ++m) {
    OnInterfacesAdded(m->first, m->second);
  }
}

}  // namespace shill