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