X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;ds=sidebyside;f=src%2Fmain%2Fjava%2Fnet%2Fpterodactylus%2Frhynodge%2Fengine%2FReactionRunner.java;h=45642cebc6c696b545540cb271bbded6552feb5b;hb=8aeef90590095a455e2323d70ba8ccae032f4276;hp=37bec1071bc4f65715e31c57db359a4ac265ea13;hpb=09c47ffd3d61d5d8d63e95d253318ec361433c76;p=rhynodge.git

diff --git a/src/main/java/net/pterodactylus/rhynodge/engine/ReactionRunner.java b/src/main/java/net/pterodactylus/rhynodge/engine/ReactionRunner.java
index 37bec10..45642ce 100644
--- a/src/main/java/net/pterodactylus/rhynodge/engine/ReactionRunner.java
+++ b/src/main/java/net/pterodactylus/rhynodge/engine/ReactionRunner.java
@@ -5,6 +5,9 @@ import static java.util.Optional.ofNullable;
 import static net.pterodactylus.rhynodge.states.FailedState.INSTANCE;
 import static org.apache.log4j.Logger.getLogger;
 
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.StringWriter;
 import java.util.Optional;
 
 import net.pterodactylus.rhynodge.Action;
@@ -12,14 +15,17 @@ import net.pterodactylus.rhynodge.Filter;
 import net.pterodactylus.rhynodge.Query;
 import net.pterodactylus.rhynodge.Reaction;
 import net.pterodactylus.rhynodge.State;
-import net.pterodactylus.rhynodge.Trigger;
+import net.pterodactylus.rhynodge.actions.EmailAction;
+import net.pterodactylus.rhynodge.Merger;
+import net.pterodactylus.rhynodge.output.DefaultOutput;
+import net.pterodactylus.rhynodge.output.Output;
 import net.pterodactylus.rhynodge.states.FailedState;
 
 import org.apache.log4j.Logger;
 
 /**
  * Runs a {@link Reaction}, starting with its {@link Query}, running the {@link
- * State} through its {@link Filter}s, and finally checking the {@link Trigger}
+ * State} through its {@link Filter}s, and finally checking the {@link Merger}
  * for whether an {@link Action} needs to be executed.
  *
  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
@@ -29,10 +35,12 @@ public class ReactionRunner implements Runnable {
 	private static final Logger logger = getLogger(ReactionRunner.class);
 	private final Reaction reaction;
 	private final ReactionState reactionState;
+	private final EmailAction errorEmailAction;
 
-	public ReactionRunner(Reaction reaction, ReactionState reactionState) {
+	public ReactionRunner(Reaction reaction, ReactionState reactionState, EmailAction errorEmailAction) {
 		this.reactionState = reactionState;
 		this.reaction = reaction;
+		this.errorEmailAction = errorEmailAction;
 	}
 
 	@Override
@@ -40,8 +48,12 @@ public class ReactionRunner implements Runnable {
 		State state = runQuery();
 		state = runStateThroughFilters(state);
 		if (!state.success()) {
-			logger.info(format("Reaction %s failed.", reaction.name()));
+			logger.info(format("Reaction %s failed in %s.", reaction.name(), state));
+			Optional<State> lastState = reactionState.loadLastState();
 			saveStateWithIncreasedFailCount(state);
+			if (thisFailureIsTheFirstFailure(lastState)) {
+				errorEmailAction.execute(createErrorOutput(reaction, state));
+			}
 			return;
 		}
 		Optional<State> lastSuccessfulState = reactionState.loadLastSuccessfulState();
@@ -50,22 +62,53 @@ public class ReactionRunner implements Runnable {
 			reactionState.saveState(state);
 			return;
 		}
-		Trigger trigger = reaction.trigger();
-		State newState = trigger.mergeStates(lastSuccessfulState.get(), state);
+		Merger merger = reaction.merger();
+		State newState = merger.mergeStates(lastSuccessfulState.get(), state);
 		reactionState.saveState(newState);
-		if (trigger.triggers()) {
+		if (newState.triggered()) {
 			logger.info(format("Trigger was hit for %s, executing action...", reaction.name()));
-			reaction.action().execute(trigger.output(reaction));
+			reaction.action().execute(newState.output(reaction));
 		}
 		logger.info(format("Reaction %s finished.", reaction.name()));
 	}
 
+	private static boolean thisFailureIsTheFirstFailure(Optional<State> lastState) {
+		return lastState.map(State::success).orElse(true);
+	}
+
 	private void saveStateWithIncreasedFailCount(State state) {
 		Optional<State> lastState = reactionState.loadLastState();
 		state.setFailCount(lastState.map(State::failCount).orElse(0) + 1);
 		reactionState.saveState(state);
 	}
 
+	private Output createErrorOutput(Reaction reaction, State state) {
+		DefaultOutput output = new DefaultOutput(String.format("Error while processing “%s!”", reaction.name()));
+		output.addText("text/plain", createErrorEmailText(reaction, state));
+		output.addText("text/html", createErrorEmailText(reaction, state));
+		return output;
+	}
+
+	private String createErrorEmailText(Reaction reaction, State state) {
+		StringBuilder emailText = new StringBuilder();
+		emailText.append(String.format("An error occured while processing “%s.”\n\n", reaction.name()));
+		appendExceptionToEmailText(state.exception(), emailText);
+		return emailText.toString();
+	}
+
+	private void appendExceptionToEmailText(Throwable exception, StringBuilder emailText) {
+		if (exception != null) {
+			try (StringWriter stringWriter = new StringWriter();
+				 PrintWriter printWriter = new PrintWriter(stringWriter)) {
+				exception.printStackTrace(printWriter);
+				emailText.append(stringWriter.toString());
+			} catch (IOException ioe1) {
+				/* StringWriter doesn’t throw. */
+				throw new RuntimeException(ioe1);
+			}
+		}
+	}
+
 	private State runQuery() {
 		logger.info(format("Querying %s...", reaction.name()));
 		try {
@@ -85,6 +128,7 @@ public class ReactionRunner implements Runnable {
 					currentState = filter.filter(currentState);
 				} catch (Throwable t1) {
 					logger.warn(format("Error during filter %s for %s.", filter.getClass().getSimpleName(), reaction.name()), t1);
+					return new FailedState(t1);
 				}
 			}
 		}