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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.loganalysis.rule;
import com.android.loganalysis.item.BugreportItem;
import com.android.loganalysis.item.DumpsysWifiStatsItem;
import java.util.concurrent.TimeUnit;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Rules definition for Wifi stats
*/
public class WifiStatsRule extends AbstractPowerRule {
private static final String WIFI_STATS = "WIFI_STATS";
private static final int WIFI_DISCONNECT_THRESHOLD = 1; // wifi disconnect should never happen
private static final int WIFI_ASSOCIATION_THRESHOLD = 1;
// Wifi scans are scheduled by GSA every 285 seconds, anything more frequent is an issue
private static final long WIFI_SCAN_INTERVAL_THRESHOLD_MS = 285000;
private long mFrequentWifiScansIntervalSecs = 0;
private int mNumFrequentWifiDisconnects = 0;
private int mNumFrequentWifiAssociations = 0;
private BugreportItem mBugreportItem = null;
public WifiStatsRule (BugreportItem bugreportItem) {
super(bugreportItem);
mBugreportItem = bugreportItem;
}
@Override
public void applyRule() {
if (mBugreportItem.getDumpsys() == null || getTimeOnBattery() <= 0) {
return;
}
DumpsysWifiStatsItem dumpsysWifiStatsItem = mBugreportItem.getDumpsys().getWifiStats();
if (dumpsysWifiStatsItem == null) {
return;
}
if (dumpsysWifiStatsItem.getNumWifiScans() > 0) {
final long observedWifiScanIntervalMs = getTimeOnBattery() /
dumpsysWifiStatsItem.getNumWifiScans();
if (observedWifiScanIntervalMs < WIFI_SCAN_INTERVAL_THRESHOLD_MS) {
mFrequentWifiScansIntervalSecs = TimeUnit.MILLISECONDS.toSeconds(
observedWifiScanIntervalMs);
}
}
if (dumpsysWifiStatsItem.getNumWifiDisconnects() >= WIFI_DISCONNECT_THRESHOLD) {
mNumFrequentWifiDisconnects = dumpsysWifiStatsItem.getNumWifiDisconnects();
}
if (dumpsysWifiStatsItem.getNumWifiAssociations() > WIFI_ASSOCIATION_THRESHOLD) {
mNumFrequentWifiAssociations = dumpsysWifiStatsItem.getNumWifiAssociations();
}
}
@Override
public JSONObject getAnalysis() {
JSONObject wifiStatsAnalysis = new JSONObject();
StringBuilder analysis = new StringBuilder();
if (mFrequentWifiScansIntervalSecs == 0) {
analysis.append("No apps requested for frequent wifi scans. ");
} else {
analysis.append(String.format("Wifi scans happened every %d seconds. ",
mFrequentWifiScansIntervalSecs));
}
if (mNumFrequentWifiDisconnects == 0) {
analysis.append("No frequent wifi disconnects were observed. ");
} else {
analysis.append(String.format("Wifi got disconnected %d times. ",
mNumFrequentWifiDisconnects));
}
if (mNumFrequentWifiAssociations == 0) {
analysis.append("No frequent wifi associations were observed. ");
} else {
analysis.append(String.format("Wifi got associated with AP %d times. ",
mNumFrequentWifiAssociations));
}
try {
wifiStatsAnalysis.put(WIFI_STATS, analysis.toString().trim());
} catch (JSONException e) {
// do nothing
}
return wifiStatsAnalysis;
}
}
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