1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.tools.bugreport;
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3 |
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4 | import java.io.PrintWriter;
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5 | import java.io.Serializable;
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6 | import java.lang.reflect.InvocationTargetException;
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7 | import java.util.ArrayList;
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8 | import java.util.Arrays;
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9 | import java.util.Collection;
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10 | import java.util.Collections;
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11 | import java.util.ConcurrentModificationException;
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12 | import java.util.HashMap;
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13 | import java.util.IdentityHashMap;
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14 | import java.util.Iterator;
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15 | import java.util.LinkedList;
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16 | import java.util.Map;
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17 | import java.util.Map.Entry;
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18 | import java.util.NoSuchElementException;
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19 | import java.util.Set;
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20 | import java.util.function.Supplier;
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21 |
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22 | import org.openstreetmap.josm.tools.Logging;
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23 | import org.openstreetmap.josm.tools.StreamUtils;
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24 |
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25 | /**
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26 | * This is a special exception that cannot be directly thrown.
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27 | * <p>
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28 | * It is used to capture more information about an exception that was already thrown.
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29 | *
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30 | * @author Michael Zangl
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31 | * @see BugReport
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32 | * @since 10285
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33 | */
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34 | public class ReportedException extends RuntimeException {
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35 | /**
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36 | * How many entries of a collection to include in the bug report.
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37 | */
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38 | private static final int MAX_COLLECTION_ENTRIES = 30;
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39 |
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40 | private static final long serialVersionUID = 737333873766201033L;
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41 |
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42 | /**
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43 | * We capture all stack traces on exception creation. This allows us to trace synchonization problems better.
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44 | * We cannot be really sure what happened but we at least see which threads
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45 | */
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46 | private final transient Map<Thread, StackTraceElement[]> allStackTraces = new HashMap<>();
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47 | private final LinkedList<Section> sections = new LinkedList<>();
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48 | private final transient Thread caughtOnThread;
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49 | private String methodWarningFrom;
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50 |
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51 | ReportedException(Throwable exception) {
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52 | this(exception, Thread.currentThread());
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53 | }
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54 |
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55 | ReportedException(Throwable exception, Thread caughtOnThread) {
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56 | super(exception);
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57 |
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58 | try {
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59 | allStackTraces.putAll(Thread.getAllStackTraces());
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60 | } catch (SecurityException e) {
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61 | Logging.log(Logging.LEVEL_ERROR, "Unable to get thread stack traces", e);
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62 | }
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63 | this.caughtOnThread = caughtOnThread;
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64 | }
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65 |
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66 | /**
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67 | * Displays a warning for this exception. The program can then continue normally. Does not block.
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68 | */
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69 | public void warn() {
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70 | methodWarningFrom = BugReport.getCallingMethod(2);
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71 | try {
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72 | BugReportQueue.getInstance().submit(this);
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73 | } catch (RuntimeException e) { // NOPMD
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74 | Logging.error(e);
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75 | }
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76 | }
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77 |
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78 | /**
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79 | * Starts a new debug data section. This normally does not need to be called manually.
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80 | *
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81 | * @param sectionName
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82 | * The section name.
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83 | */
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84 | public void startSection(String sectionName) {
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85 | sections.add(new Section(sectionName));
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86 | }
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87 |
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88 | /**
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89 | * Prints the captured data of this report to a {@link PrintWriter}.
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90 | *
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91 | * @param out
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92 | * The writer to print to.
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93 | */
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94 | public void printReportDataTo(PrintWriter out) {
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95 | out.println("=== REPORTED CRASH DATA ===");
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96 | for (Section s : sections) {
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97 | s.printSection(out);
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98 | out.println();
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99 | }
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100 |
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101 | if (methodWarningFrom != null) {
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102 | out.println("Warning issued by: " + methodWarningFrom);
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103 | out.println();
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104 | }
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105 | }
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106 |
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107 | /**
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108 | * Prints the stack trace of this report to a {@link PrintWriter}.
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109 | *
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110 | * @param out
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111 | * The writer to print to.
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112 | */
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113 | public void printReportStackTo(PrintWriter out) {
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114 | out.println("=== STACK TRACE ===");
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115 | out.println(niceThreadName(caughtOnThread));
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116 | getCause().printStackTrace(out);
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117 | out.println();
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118 | }
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119 |
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120 | /**
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121 | * Prints the stack traces for other threads of this report to a {@link PrintWriter}.
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122 | *
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123 | * @param out
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124 | * The writer to print to.
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125 | */
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126 | public void printReportThreadsTo(PrintWriter out) {
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127 | out.println("=== RUNNING THREADS ===");
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128 | for (Entry<Thread, StackTraceElement[]> thread : allStackTraces.entrySet()) {
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129 | out.println(niceThreadName(thread.getKey()));
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130 | if (caughtOnThread.equals(thread.getKey())) {
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131 | out.println("Stacktrace see above.");
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132 | } else {
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133 | for (StackTraceElement e : thread.getValue()) {
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134 | out.println(e);
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135 | }
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136 | }
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137 | out.println();
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138 | }
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139 | }
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140 |
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141 | private static String niceThreadName(Thread thread) {
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142 | StringBuilder name = new StringBuilder("Thread: ").append(thread.getName()).append(" (").append(thread.getId()).append(')');
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143 | ThreadGroup threadGroup = thread.getThreadGroup();
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144 | if (threadGroup != null) {
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145 | name.append(" of ").append(threadGroup.getName());
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146 | }
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147 | return name.toString();
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148 | }
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149 |
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150 | /**
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151 | * Checks if this exception is considered the same as an other exception. This is the case if both have the same cause and message.
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152 | *
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153 | * @param e
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154 | * The exception to check against.
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155 | * @return <code>true</code> if they are considered the same.
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156 | */
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157 | public boolean isSame(ReportedException e) {
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158 | if (!getMessage().equals(e.getMessage())) {
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159 | return false;
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160 | }
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161 |
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162 | return hasSameStackTrace(new CauseTraceIterator(), e.getCause());
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163 | }
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164 |
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165 | private static boolean hasSameStackTrace(CauseTraceIterator causeTraceIterator, Throwable e2) {
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166 | if (!causeTraceIterator.hasNext()) {
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167 | // all done.
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168 | return true;
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169 | }
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170 | Throwable e1 = causeTraceIterator.next();
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171 | StackTraceElement[] t1 = e1.getStackTrace();
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172 | StackTraceElement[] t2 = e2.getStackTrace();
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173 |
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174 | if (!Arrays.equals(t1, t2)) {
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175 | return false;
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176 | }
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177 |
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178 | Throwable c1 = e1.getCause();
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179 | Throwable c2 = e2.getCause();
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180 | if ((c1 == null) != (c2 == null)) {
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181 | return false;
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182 | } else if (c1 != null) {
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183 | return hasSameStackTrace(causeTraceIterator, c2);
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184 | } else {
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185 | return true;
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186 | }
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187 | }
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188 |
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189 | /**
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190 | * Adds some debug values to this exception. The value is converted to a string. Errors during conversion are handled.
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191 | *
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192 | * @param key
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193 | * The key to add this for. Does not need to be unique but it would be nice.
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194 | * @param value
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195 | * The value.
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196 | * @return This exception for easy chaining.
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197 | */
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198 | public ReportedException put(String key, Object value) {
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199 | return put(key, () -> value);
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200 | }
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201 |
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202 | /**
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203 | * Adds some debug values to this exception. This method automatically catches errors that occur during the production of the value.
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204 | *
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205 | * @param key
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206 | * The key to add this for. Does not need to be unique but it would be nice.
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207 | * @param valueSupplier
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208 | * A supplier that is called once to get the value.
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209 | * @return This exception for easy chaining.
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210 | * @since 10586
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211 | */
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212 | public ReportedException put(String key, Supplier<Object> valueSupplier) {
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213 | String string;
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214 | try {
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215 | Object value = valueSupplier.get();
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216 | if (value == null) {
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217 | string = "null";
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218 | } else if (value instanceof Collection) {
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219 | string = makeCollectionNice((Collection<?>) value);
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220 | } else if (value.getClass().isArray()) {
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221 | string = makeCollectionNice(Arrays.asList(value));
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222 | } else {
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223 | string = value.toString();
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224 | }
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225 | } catch (RuntimeException t) { // NOPMD
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226 | Logging.warn(t);
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227 | string = "<Error calling toString()>";
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228 | }
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229 | sections.getLast().put(key, string);
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230 | return this;
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231 | }
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232 |
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233 | private static String makeCollectionNice(Collection<?> value) {
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234 | int lines = 0;
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235 | StringBuilder str = new StringBuilder(32);
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236 | for (Object e : value) {
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237 | str.append("\n - ");
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238 | if (lines <= MAX_COLLECTION_ENTRIES) {
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239 | str.append(e);
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240 | } else {
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241 | str.append("\n ... (")
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242 | .append(value.size())
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243 | .append(" entries)");
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244 | break;
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245 | }
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246 | }
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247 | return str.toString();
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248 | }
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249 |
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250 | @Override
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251 | public String toString() {
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252 | return "ReportedException [thread=" + caughtOnThread + ", exception=" + getCause()
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253 | + ", methodWarningFrom=" + methodWarningFrom + ']';
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254 | }
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255 |
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256 | /**
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257 | * Check if this exception may be caused by a threading issue.
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258 | * @return <code>true</code> if it is.
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259 | * @since 10585
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260 | */
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261 | public boolean mayHaveConcurrentSource() {
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262 | return StreamUtils.toStream(CauseTraceIterator::new)
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263 | .anyMatch(t -> t instanceof ConcurrentModificationException || t instanceof InvocationTargetException);
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264 | }
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265 |
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266 | /**
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267 | * Check if this is caused by an out of memory situaition
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268 | * @return <code>true</code> if it is.
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269 | * @since 10819
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270 | */
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271 | public boolean isOutOfMemory() {
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272 | return StreamUtils.toStream(CauseTraceIterator::new).anyMatch(t -> t instanceof OutOfMemoryError);
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273 | }
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274 |
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275 | /**
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276 | * Iterates over the causes for this exception. Ignores cycles and aborts iteration then.
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277 | * @author Michal Zangl
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278 | * @since 10585
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279 | */
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280 | private final class CauseTraceIterator implements Iterator<Throwable> {
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281 | private Throwable current = getCause();
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282 | private final Set<Throwable> dejaVu = Collections.newSetFromMap(new IdentityHashMap<Throwable, Boolean>());
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283 |
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284 | @Override
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285 | public boolean hasNext() {
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286 | return current != null;
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287 | }
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288 |
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289 | @Override
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290 | public Throwable next() {
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291 | if (!hasNext()) {
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292 | throw new NoSuchElementException();
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293 | }
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294 | Throwable toReturn = current;
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295 | advance();
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296 | return toReturn;
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297 | }
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298 |
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299 | private void advance() {
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300 | dejaVu.add(current);
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301 | current = current.getCause();
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302 | if (current != null && dejaVu.contains(current)) {
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303 | current = null;
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304 | }
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305 | }
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306 | }
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307 |
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308 | private static class SectionEntry implements Serializable {
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309 |
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310 | private static final long serialVersionUID = 1L;
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311 |
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312 | private final String key;
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313 | private final String value;
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314 |
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315 | SectionEntry(String key, String value) {
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316 | this.key = key;
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317 | this.value = value;
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318 | }
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319 |
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320 | /**
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321 | * Prints this entry to the output stream in a line.
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322 | * @param out The stream to print to.
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323 | */
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324 | public void print(PrintWriter out) {
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325 | out.print(" - ");
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326 | out.print(key);
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327 | out.print(": ");
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328 | out.println(value);
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329 | }
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330 | }
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331 |
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332 | private static class Section implements Serializable {
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333 |
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334 | private static final long serialVersionUID = 1L;
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335 |
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336 | private final String sectionName;
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337 | private final ArrayList<SectionEntry> entries = new ArrayList<>();
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338 |
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339 | Section(String sectionName) {
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340 | this.sectionName = sectionName;
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341 | }
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342 |
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343 | /**
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344 | * Add a key/value entry to this section.
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345 | * @param key The key. Need not be unique.
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346 | * @param value The value.
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347 | */
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348 | public void put(String key, String value) {
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349 | entries.add(new SectionEntry(key, value));
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350 | }
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351 |
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352 | /**
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353 | * Prints this section to the output stream.
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354 | * @param out The stream to print to.
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355 | */
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356 | public void printSection(PrintWriter out) {
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357 | out.println(sectionName + ':');
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358 | if (entries.isEmpty()) {
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359 | out.println("No data collected.");
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360 | } else {
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361 | for (SectionEntry e : entries) {
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362 | e.print(out);
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363 | }
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364 | }
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365 | }
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366 | }
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367 | }
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