Improve logging

- Make sure logging of UnknownHostException indicates the failure reason
- Indent stack traces inside event blocks in EventLogger
- Don't log media URLs

PiperOrigin-RevId: 302007601

extensions/okhttp/src/main/java/com/google/android/exoplayer2/ext/okhttp/OkHttpDataSource.java

@@ -223,7 +223,7 @@ public class OkHttpDataSource extends BaseDataSource implements HttpDataSource {
       responseByteStream = responseBody.byteStream();
     } catch (IOException e) {
       throw new HttpDataSourceException(
-          "Unable to connect to " + dataSpec.uri, e, dataSpec, HttpDataSourceException.TYPE_OPEN);
+          "Unable to connect", e, dataSpec, HttpDataSourceException.TYPE_OPEN);
     }
 
     int responseCode = response.code();

library/common/src/main/java/com/google/android/exoplayer2/util/Log.java

@@ -21,6 +21,7 @@ import androidx.annotation.Nullable;
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
+import java.net.UnknownHostException;
 
 /** Wrapper around {@link android.util.Log} which allows to set the log level. */
 public final class Log {
@@ -69,7 +70,8 @@ public final class Log {
   }
 
   /**
-   * Sets whether stack traces of {@link Throwable}s will be logged to logcat.
+   * Sets whether stack traces of {@link Throwable}s will be logged to logcat. Stack trace logging
+   * is enabled by default.
    *
    * @param logStackTraces Whether stack traces will be logged.
    */
@@ -86,11 +88,7 @@ public final class Log {
 
   /** @see android.util.Log#d(String, String, Throwable) */
   public static void d(String tag, String message, @Nullable Throwable throwable) {
-    if (!logStackTraces) {
-      d(tag, appendThrowableMessage(message, throwable));
-    } else if (logLevel == LOG_LEVEL_ALL) {
-      android.util.Log.d(tag, message, throwable);
-    }
+    d(tag, appendThrowableString(message, throwable));
   }
 
   /** @see android.util.Log#i(String, String) */
@@ -102,11 +100,7 @@ public final class Log {
 
   /** @see android.util.Log#i(String, String, Throwable) */
   public static void i(String tag, String message, @Nullable Throwable throwable) {
-    if (!logStackTraces) {
-      i(tag, appendThrowableMessage(message, throwable));
-    } else if (logLevel <= LOG_LEVEL_INFO) {
-      android.util.Log.i(tag, message, throwable);
-    }
+    i(tag, appendThrowableString(message, throwable));
   }
 
   /** @see android.util.Log#w(String, String) */
@@ -118,11 +112,7 @@ public final class Log {
 
   /** @see android.util.Log#w(String, String, Throwable) */
   public static void w(String tag, String message, @Nullable Throwable throwable) {
-    if (!logStackTraces) {
-      w(tag, appendThrowableMessage(message, throwable));
-    } else if (logLevel <= LOG_LEVEL_WARNING) {
-      android.util.Log.w(tag, message, throwable);
-    }
+    w(tag, appendThrowableString(message, throwable));
   }
 
   /** @see android.util.Log#e(String, String) */
@@ -134,18 +124,54 @@ public final class Log {
 
   /** @see android.util.Log#e(String, String, Throwable) */
   public static void e(String tag, String message, @Nullable Throwable throwable) {
-    if (!logStackTraces) {
-      e(tag, appendThrowableMessage(message, throwable));
-    } else if (logLevel <= LOG_LEVEL_ERROR) {
-      android.util.Log.e(tag, message, throwable);
+    e(tag, appendThrowableString(message, throwable));
+  }
+
+  /**
+   * Returns a string representation of a {@link Throwable} suitable for logging, taking into
+   * account whether {@link #setLogStackTraces(boolean)} stack trace logging} is enabled.
+   *
+   * <p>Stack trace logging may be unconditionally suppressed for some expected failure modes (e.g.,
+   * {@link Throwable Throwables} that are expected if the device doesn't have network connectivity)
+   * to avoid log spam.
+   *
+   * @param throwable The {@link Throwable}.
+   * @return The string representation of the {@link Throwable}.
+   */
+  @Nullable
+  public static String getThrowableString(@Nullable Throwable throwable) {
+    if (throwable == null) {
+      return null;
+    } else if (isCausedByUnknownHostException(throwable)) {
+      // UnknownHostException implies the device doesn't have network connectivity.
+      // UnknownHostException.getMessage() may return a string that's more verbose than desired for
+      // logging an expected failure mode. Conversely, android.util.Log.getStackTraceString has
+      // special handling to return the empty string, which can result in logging that doesn't
+      // indicate the failure mode at all. Hence we special case this exception to always return a
+      // concise but useful message.
+      return "UnknownHostException (no network)";
+    } else if (!logStackTraces) {
+      return throwable.getMessage();
+    } else {
+      return android.util.Log.getStackTraceString(throwable).trim().replace("\t", "    ");
     }
   }
 
-  private static String appendThrowableMessage(String message, @Nullable Throwable throwable) {
-    if (throwable == null) {
-      return message;
+  private static String appendThrowableString(String message, @Nullable Throwable throwable) {
+    @Nullable String throwableString = getThrowableString(throwable);
+    if (!TextUtils.isEmpty(throwableString)) {
+      message += "\n  " + throwableString.replace("\n", "\n  ") + '\n';
     }
-    String throwableMessage = throwable.getMessage();
-    return TextUtils.isEmpty(throwableMessage) ? message : message + " - " + throwableMessage;
+    return message;
+  }
+
+  private static boolean isCausedByUnknownHostException(@Nullable Throwable throwable) {
+    while (throwable != null) {
+      if (throwable instanceof UnknownHostException) {
+        return true;
+      }
+      throwable = throwable.getCause();
+    }
+    return false;
   }
 }

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImplInternal.java

@@ -477,7 +477,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
       playbackInfo = playbackInfo.copyWithPlaybackError(e);
       maybeNotifyPlaybackInfoChanged();
     } catch (IOException e) {
-      Log.e(TAG, "Source error.", e);
+      Log.e(TAG, "Source error", e);
       stopInternal(
           /* forceResetRenderers= */ false,
           /* resetPositionAndState= */ false,
@@ -485,7 +485,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
       playbackInfo = playbackInfo.copyWithPlaybackError(ExoPlaybackException.createForSource(e));
       maybeNotifyPlaybackInfoChanged();
     } catch (RuntimeException | OutOfMemoryError e) {
-      Log.e(TAG, "Internal runtime error.", e);
+      Log.e(TAG, "Internal runtime error", e);
       ExoPlaybackException error =
           e instanceof OutOfMemoryError
               ? ExoPlaybackException.createForOutOfMemoryError((OutOfMemoryError) e)

library/core/src/main/java/com/google/android/exoplayer2/upstream/DefaultHttpDataSource.java

@@ -279,8 +279,8 @@ public class DefaultHttpDataSource extends BaseDataSource implements HttpDataSou
     try {
       connection = makeConnection(dataSpec);
     } catch (IOException e) {
-      throw new HttpDataSourceException("Unable to connect to " + dataSpec.uri.toString(), e,
-          dataSpec, HttpDataSourceException.TYPE_OPEN);
+      throw new HttpDataSourceException(
+          "Unable to connect", e, dataSpec, HttpDataSourceException.TYPE_OPEN);
     }
 
     String responseMessage;
@@ -289,8 +289,8 @@ public class DefaultHttpDataSource extends BaseDataSource implements HttpDataSou
       responseMessage = connection.getResponseMessage();
     } catch (IOException e) {
       closeConnectionQuietly();
-      throw new HttpDataSourceException("Unable to connect to " + dataSpec.uri.toString(), e,
-          dataSpec, HttpDataSourceException.TYPE_OPEN);
+      throw new HttpDataSourceException(
+          "Unable to connect", e, dataSpec, HttpDataSourceException.TYPE_OPEN);
     }
 
     // Check for a valid response code.

library/core/src/main/java/com/google/android/exoplayer2/util/EventLogger.java

@@ -16,6 +16,7 @@
 package com.google.android.exoplayer2.util;
 
 import android.os.SystemClock;
+import android.text.TextUtils;
 import android.view.Surface;
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
@@ -209,7 +210,7 @@ public class EventLogger implements AnalyticsListener {
       logd(eventTime, "tracks", "[]");
       return;
     }
-    logd("tracks [" + getEventTimeString(eventTime) + ", ");
+    logd("tracks [" + getEventTimeString(eventTime));
     // Log tracks associated to renderers.
     int rendererCount = mappedTrackInfo.getRendererCount();
     for (int rendererIndex = 0; rendererIndex < rendererCount; rendererIndex++) {
@@ -293,7 +294,7 @@ public class EventLogger implements AnalyticsListener {
 
   @Override
   public void onMetadata(EventTime eventTime, Metadata metadata) {
-    logd("metadata [" + getEventTimeString(eventTime) + ", ");
+    logd("metadata [" + getEventTimeString(eventTime));
     printMetadata(metadata, "  ");
     logd("]");
   }
@@ -485,27 +486,26 @@ public class EventLogger implements AnalyticsListener {
   }
 
   /**
-   * Logs an error message and exception.
+   * Logs an error message.
    *
    * @param msg The message to log.
-   * @param tr The exception to log.
    */
-  protected void loge(String msg, @Nullable Throwable tr) {
-    Log.e(tag, msg, tr);
+  protected void loge(String msg) {
+    Log.e(tag, msg);
   }
 
   // Internal methods
 
   private void logd(EventTime eventTime, String eventName) {
-    logd(getEventString(eventTime, eventName));
+    logd(getEventString(eventTime, eventName, /* eventDescription= */ null, /* throwable= */ null));
   }
 
   private void logd(EventTime eventTime, String eventName, String eventDescription) {
-    logd(getEventString(eventTime, eventName, eventDescription));
+    logd(getEventString(eventTime, eventName, eventDescription, /* throwable= */ null));
   }
 
   private void loge(EventTime eventTime, String eventName, @Nullable Throwable throwable) {
-    loge(getEventString(eventTime, eventName), throwable);
+    loge(getEventString(eventTime, eventName, /* eventDescription= */ null, throwable));
   }
 
   private void loge(
@@ -513,7 +513,7 @@ public class EventLogger implements AnalyticsListener {
       String eventName,
       String eventDescription,
       @Nullable Throwable throwable) {
-    loge(getEventString(eventTime, eventName, eventDescription), throwable);
+    loge(getEventString(eventTime, eventName, eventDescription, throwable));
   }
 
   private void printInternalError(EventTime eventTime, String type, Exception e) {
@@ -526,12 +526,21 @@ public class EventLogger implements AnalyticsListener {
     }
   }
 
-  private String getEventString(EventTime eventTime, String eventName) {
-    return eventName + " [" + getEventTimeString(eventTime) + "]";
-  }
-
-  private String getEventString(EventTime eventTime, String eventName, String eventDescription) {
-    return eventName + " [" + getEventTimeString(eventTime) + ", " + eventDescription + "]";
+  private String getEventString(
+      EventTime eventTime,
+      String eventName,
+      @Nullable String eventDescription,
+      @Nullable Throwable throwable) {
+    String eventString = eventName + " [" + getEventTimeString(eventTime);
+    if (eventDescription != null) {
+      eventString += ", " + eventDescription;
+    }
+    @Nullable String throwableString = Log.getThrowableString(throwable);
+    if (!TextUtils.isEmpty(throwableString)) {
+      eventString += "\n  " + throwableString.replace("\n", "\n  ") + '\n';
+    }
+    eventString += "]";
+    return eventString;
   }
 
   private String getEventTimeString(EventTime eventTime) {