1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "content/browser/geolocation/wifi_data_provider_common.h"
6
7 #include "base/bind.h"
8 #include "base/strings/stringprintf.h"
9 #include "base/strings/utf_string_conversions.h"
10
11 namespace content {
12
MacAddressAsString16(const uint8 mac_as_int[6])13 base::string16 MacAddressAsString16(const uint8 mac_as_int[6]) {
14 // mac_as_int is big-endian. Write in byte chunks.
15 // Format is XX-XX-XX-XX-XX-XX.
16 static const char* const kMacFormatString =
17 "%02x-%02x-%02x-%02x-%02x-%02x";
18 return base::ASCIIToUTF16(base::StringPrintf(kMacFormatString,
19 mac_as_int[0],
20 mac_as_int[1],
21 mac_as_int[2],
22 mac_as_int[3],
23 mac_as_int[4],
24 mac_as_int[5]));
25 }
26
WifiDataProviderCommon()27 WifiDataProviderCommon::WifiDataProviderCommon()
28 : is_first_scan_complete_(false),
29 weak_factory_(this) {
30 }
31
~WifiDataProviderCommon()32 WifiDataProviderCommon::~WifiDataProviderCommon() {
33 }
34
StartDataProvider()35 void WifiDataProviderCommon::StartDataProvider() {
36 DCHECK(wlan_api_ == NULL);
37 wlan_api_.reset(NewWlanApi());
38 if (wlan_api_ == NULL) {
39 // Error! Can't do scans, so don't try and schedule one.
40 is_first_scan_complete_ = true;
41 return;
42 }
43
44 DCHECK(polling_policy_ == NULL);
45 polling_policy_.reset(NewPollingPolicy());
46 DCHECK(polling_policy_ != NULL);
47
48 // Perform first scan ASAP regardless of the polling policy. If this scan
49 // fails we'll retry at a rate in line with the polling policy.
50 ScheduleNextScan(0);
51 }
52
StopDataProvider()53 void WifiDataProviderCommon::StopDataProvider() {
54 wlan_api_.reset();
55 polling_policy_.reset();
56 }
57
GetData(WifiData * data)58 bool WifiDataProviderCommon::GetData(WifiData* data) {
59 *data = wifi_data_;
60 // If we've successfully completed a scan, indicate that we have all of the
61 // data we can get.
62 return is_first_scan_complete_;
63 }
64
DoWifiScanTask()65 void WifiDataProviderCommon::DoWifiScanTask() {
66 bool update_available = false;
67 WifiData new_data;
68 if (!wlan_api_->GetAccessPointData(&new_data.access_point_data)) {
69 ScheduleNextScan(polling_policy_->NoWifiInterval());
70 } else {
71 update_available = wifi_data_.DiffersSignificantly(new_data);
72 wifi_data_ = new_data;
73 polling_policy_->UpdatePollingInterval(update_available);
74 ScheduleNextScan(polling_policy_->PollingInterval());
75 }
76 if (update_available || !is_first_scan_complete_) {
77 is_first_scan_complete_ = true;
78 RunCallbacks();
79 }
80 }
81
ScheduleNextScan(int interval)82 void WifiDataProviderCommon::ScheduleNextScan(int interval) {
83 client_loop()->PostDelayedTask(
84 FROM_HERE,
85 base::Bind(&WifiDataProviderCommon::DoWifiScanTask,
86 weak_factory_.GetWeakPtr()),
87 base::TimeDelta::FromMilliseconds(interval));
88 }
89
90 } // namespace content
91