Add limits to Breadcrumb length

Fixes #117

Author: marcomorain

README.md

@@ -70,6 +70,7 @@ table below shows an example of what the data will look like in Sentry.
 
 Version | Changes
 --- | ---
+**1.6.0** | Increase breadcrumb limit to 100 to match other Sentry clients, allow runtime configuration. [#117](https://github.com/joshdholtz/Sentry-Android/issues/117).
 **1.5.4** | Ensure that breadcrumbs are added to all exceptions. [#115](https://github.com/joshdholtz/Sentry-Android/issues/115).
 **1.5.3** | Fix thread-safety bug when serializing breadcrumbs. [#110](https://github.com/joshdholtz/Sentry-Android/issues/110) (thanks to [fab1an](https://github.com/fab1an)).
 **1.5.2** | Send stack-frames to Sentry in the correct order. [#95](https://github.com/joshdholtz/Sentry-Android/pull/95).<br/> Use the [versionName](https://developer.android.com/studio/publish/versioning.html#appversioning), rather than versionCode, as the default value for the release field of events (thanks to [FelixBondarenko](https://github.com/FelixBondarenko)).
@@ -94,7 +95,7 @@ Version | Changes
 ### Gradle
 Available in jCenter
 ```
-compile 'com.joshdholtz.sentry:sentry-android:1.5.0'
+compile 'com.joshdholtz.sentry:sentry-android:1.6.0'
 ```
 
 ### Manual

sentry-android/build.gradle

@@ -5,7 +5,7 @@ plugins {
 apply plugin: 'com.android.library'
 
 
-def SentryAndroidVersion = "1.5.4"
+def SentryAndroidVersion = "1.6.0"
 
 android {
     compileSdkVersion 24

sentry-android/src/androidTest/java/com/joshdholtz/sentry/SentryEventBuilderTest.java

@@ -122,4 +122,11 @@ public void testInternalPackageNameRegex() throws Exception {
             assertFalse(c, c.matches(Sentry.SentryEventBuilder.isInternalPackage));
         }
     }
-}
+
+    public void testMaxBreadcrumbs() {
+        Sentry.setMaxBreadcrumbs(-5);
+        assertEquals(0, Sentry.LazyHolder.instance.breadcrumbs.maxBreadcrumbs.get());
+        Sentry.setMaxBreadcrumbs(1000);
+        assertEquals(200, Sentry.LazyHolder.instance.breadcrumbs.maxBreadcrumbs.get());
+    }
+}

sentry-android/src/main/java/com/joshdholtz/sentry/Sentry.java

@@ -74,6 +74,7 @@
 import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.concurrent.locks.ReadWriteLock;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
@@ -100,7 +101,7 @@ public class Sentry {
     private SentryEventCaptureListener captureListener;
     private JSONObject contexts = new JSONObject();
     private Executor executor;
-    private final Breadcrumbs breadcrumbs = new Breadcrumbs();
+    final Breadcrumbs breadcrumbs = new Breadcrumbs();
 
     public enum SentryEventLevel {
 
@@ -130,8 +131,8 @@ private static Sentry getInstance() {
         return LazyHolder.instance;
     }
 
-    private static class LazyHolder {
-        private static final Sentry instance = new Sentry();
+    static class LazyHolder {
+        static final Sentry instance = new Sentry();
     }
 
     public static void init(Context context, String dsn) {
@@ -258,6 +259,16 @@ public static void setCaptureListener(SentryEventCaptureListener captureListener
         Sentry.getInstance().captureListener = captureListener;
     }
 
+    /**
+     * Set a limit on the number of breadcrumbs that will be stored by the client, and sent with
+     * exceptions.
+     *
+     * @param maxBreadcrumbs the maximum number of breadcrumbs to store and send.
+     */
+    public static void setMaxBreadcrumbs(int maxBreadcrumbs) {
+        getInstance().breadcrumbs.setMaxBreadcrumbs(maxBreadcrumbs);
+    }
+
     public static void captureMessage(String message) {
         Sentry.captureMessage(message, SentryEventLevel.INFO);
     }
@@ -656,22 +667,23 @@ enum Type {
         }
     }
 
-    private static class Breadcrumbs {
+    static class Breadcrumbs {
 
         // The max number of breadcrumbs that will be tracked at any one time.
-        private static final int MAX_BREADCRUMBS = 10;
-
+        final AtomicInteger maxBreadcrumbs = new AtomicInteger(100);
 
         // Access to this list must be thread-safe.
         // See GitHub Issue #110
         // This list is protected by the provided ReadWriteLock.
-        private final LinkedList<Breadcrumb> breadcrumbs = new LinkedList<>();
-        private final ReadWriteLock lock = new ReentrantReadWriteLock();
+        final LinkedList<Breadcrumb> breadcrumbs = new LinkedList<>();
+        final ReadWriteLock lock = new ReentrantReadWriteLock();
 
         void push(Breadcrumb b) {
             try {
                 lock.writeLock().lock();
-                while (breadcrumbs.size() >= MAX_BREADCRUMBS) {
+
+                final int toRemove = breadcrumbs.size() - maxBreadcrumbs.get() + 1;
+                for (int i = 0; i < toRemove; i++) {
                     breadcrumbs.removeFirst();
                 }
                 breadcrumbs.add(b);
@@ -702,6 +714,11 @@ JSONArray current() {
             return crumbs;
         }
 
+        void setMaxBreadcrumbs(int maxBreadcrumbs) {
+            maxBreadcrumbs = Math.min(200, Math.max(0, maxBreadcrumbs));
+            this.maxBreadcrumbs.set(maxBreadcrumbs);
+        }
+
     }
 
     /**

sentry-app/src/main/java/com/joshdholtz/sentryapp/MainActivity.java

@@ -25,11 +25,18 @@ protected void onCreate(Bundle savedInstanceState) {
         Sentry.init(this, yourDSN);
         Sentry.debug = true;
 
+
+        Sentry.setMaxBreadcrumbs(8);
+        for (int i=0; i<15; i++) {
+            Sentry.addBreadcrumb("Limit Test", Integer.toString(i));
+        }
+        Sentry.captureMessage("8 breadcrumbs test.");
+
         Sentry.addNavigationBreadcrumb("activity.main", "here", "there");
         Sentry.addHttpBreadcrumb("http://example.com", "GET", 202);
 
         Sentry.captureEvent(new Sentry.SentryEventBuilder()
-            .setMessage("OMG this works woooo")
+            .setMessage("This event has a message and a stacktrace.")
             .setStackTrace(Thread.currentThread().getStackTrace())
         );