1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5 * use this file except in compliance with the License. You may obtain a copy of
6 * the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations under
14 * the License.
15 */
16package com.android.internal.os;
17
18import android.support.test.filters.SmallTest;
19
20import junit.framework.TestCase;
21
22import java.nio.charset.Charset;
23
24public class KernelWakelockReaderTest extends TestCase {
25    /**
26     * Helper class that builds the mock Kernel module file /d/wakeup_sources.
27     */
28    private static class ProcFileBuilder {
29        private final static String sHeader = "name\t\tactive_count\tevent_count\twakeup_count\t" +
30                "expire_count\tactive_since\ttotal_time\tmax_time\tlast_change\t" +
31                "prevent_suspend_time\n";
32
33        private StringBuilder mStringBuilder;
34
35        private void ensureHeader() {
36            if (mStringBuilder == null) {
37                mStringBuilder = new StringBuilder();
38                mStringBuilder.append(sHeader);
39            }
40        }
41
42        public ProcFileBuilder addLine(String name, int count, long timeMillis) {
43            ensureHeader();
44            mStringBuilder.append(name).append("\t").append(count).append("\t0\t0\t0\t0\t")
45                    .append(timeMillis).append("\t0\t0\t0\n");
46            return this;
47        }
48
49        public byte[] getBytes() throws Exception {
50            ensureHeader();
51            byte[] data = mStringBuilder.toString().getBytes(Charset.forName("UTF-8"));
52
53            // The Kernel puts a \0 at the end of the data. Since each of our lines ends with \n,
54            // we override the last \n with a \0.
55            data[data.length - 1] = 0;
56            return data;
57        }
58    }
59
60    private KernelWakelockReader mReader;
61
62    @Override
63    public void setUp() throws Exception {
64        super.setUp();
65        mReader = new KernelWakelockReader();
66    }
67
68    @SmallTest
69    public void testParseEmptyFile() throws Exception {
70        KernelWakelockStats staleStats = mReader.parseProcWakelocks(new byte[0], 0, true,
71                new KernelWakelockStats());
72        assertTrue(staleStats.isEmpty());
73    }
74
75    @SmallTest
76    public void testOnlyHeader() throws Exception {
77        byte[] buffer = new ProcFileBuilder().getBytes();
78        KernelWakelockStats staleStats = mReader.parseProcWakelocks(buffer, buffer.length, true,
79                new KernelWakelockStats());
80        assertTrue(staleStats.isEmpty());
81    }
82
83    @SmallTest
84    public void testOneWakelock() throws Exception {
85        byte[] buffer = new ProcFileBuilder()
86                .addLine("Wakelock", 34, 123) // Milliseconds
87                .getBytes();
88        KernelWakelockStats staleStats = mReader.parseProcWakelocks(buffer, buffer.length, true,
89                new KernelWakelockStats());
90        assertEquals(1, staleStats.size());
91        assertTrue(staleStats.containsKey("Wakelock"));
92
93        KernelWakelockStats.Entry entry = staleStats.get("Wakelock");
94        assertEquals(34, entry.mCount);
95        assertEquals(123 * 1000, entry.mTotalTime); // Microseconds
96    }
97
98    @SmallTest
99    public void testTwoWakelocks() throws Exception {
100        byte[] buffer = new ProcFileBuilder()
101                .addLine("Wakelock", 1, 10)
102                .addLine("Fakelock", 2, 20)
103                .getBytes();
104        KernelWakelockStats staleStats = mReader.parseProcWakelocks(buffer, buffer.length, true,
105                new KernelWakelockStats());
106        assertEquals(2, staleStats.size());
107        assertTrue(staleStats.containsKey("Wakelock"));
108        assertTrue(staleStats.containsKey("Fakelock"));
109    }
110
111    @SmallTest
112    public void testDuplicateWakelocksAccumulate() throws Exception {
113        byte[] buffer = new ProcFileBuilder()
114                .addLine("Wakelock", 1, 10) // Milliseconds
115                .addLine("Wakelock", 1, 10) // Milliseconds
116                .getBytes();
117        KernelWakelockStats staleStats = mReader.parseProcWakelocks(buffer, buffer.length, true,
118                new KernelWakelockStats());
119        assertEquals(1, staleStats.size());
120        assertTrue(staleStats.containsKey("Wakelock"));
121
122        KernelWakelockStats.Entry entry = staleStats.get("Wakelock");
123        assertEquals(2, entry.mCount);
124        assertEquals(20 * 1000, entry.mTotalTime); // Microseconds
125    }
126
127    @SmallTest
128    public void testWakelocksBecomeStale() throws Exception {
129        byte[] buffer = new ProcFileBuilder()
130                .addLine("Fakelock", 3, 30)
131                .getBytes();
132        KernelWakelockStats staleStats = new KernelWakelockStats();
133
134        staleStats = mReader.parseProcWakelocks(buffer, buffer.length, true, staleStats);
135        assertEquals(1, staleStats.size());
136        assertTrue(staleStats.containsKey("Fakelock"));
137
138        buffer = new ProcFileBuilder()
139                .addLine("Wakelock", 1, 10)
140                .getBytes();
141
142        staleStats = mReader.parseProcWakelocks(buffer, buffer.length, true, staleStats);
143        assertEquals(1, staleStats.size());
144        assertTrue(staleStats.containsKey("Wakelock"));
145        assertFalse(staleStats.containsKey("Fakelock"));
146    }
147}
148