SONARGITUB-19 Improve error reporting

Author: henryju

src/main/java/org/sonar/plugins/github/GitHubPluginConfiguration.java

@@ -28,6 +28,8 @@
 import org.sonar.api.config.Settings;
 import org.sonar.api.utils.MessageException;
 
+import static org.apache.commons.lang.StringUtils.isNotBlank;
+
 @InstantiationStrategy(InstantiationStrategy.PER_BATCH)
 public class GitHubPluginConfiguration implements BatchComponent {
 
@@ -51,7 +53,7 @@ public String repository() {
     if (settings.hasKey(GitHubPlugin.GITHUB_REPO)) {
       return repoFromProp();
     }
-    if (settings.hasKey(CoreProperties.LINKS_SOURCES_DEV) || settings.hasKey(CoreProperties.LINKS_SOURCES)) {
+    if (isNotBlank(settings.getString(CoreProperties.LINKS_SOURCES_DEV)) || isNotBlank(settings.getString(CoreProperties.LINKS_SOURCES))) {
       return repoFromScmProps();
     }
     throw MessageException.of("Unable to determine GitHub repository name for this project. Please provide it using property '" + GitHubPlugin.GITHUB_REPO
@@ -60,11 +62,11 @@ public String repository() {
 
   private String repoFromScmProps() {
     String repo = null;
-    if (settings.hasKey(CoreProperties.LINKS_SOURCES_DEV)) {
+    if (isNotBlank(settings.getString(CoreProperties.LINKS_SOURCES_DEV))) {
       String url = settings.getString(CoreProperties.LINKS_SOURCES_DEV);
       repo = extractRepoFromGitUrl(url);
     }
-    if (repo == null && settings.hasKey(CoreProperties.LINKS_SOURCES)) {
+    if (repo == null && isNotBlank(settings.getString(CoreProperties.LINKS_SOURCES))) {
       String url = settings.getString(CoreProperties.LINKS_SOURCES);
       repo = extractRepoFromGitUrl(url);
     }

src/main/java/org/sonar/plugins/github/PullRequestFacade.java

@@ -47,6 +47,7 @@
 import org.sonar.api.batch.fs.InputFile;
 import org.sonar.api.batch.fs.InputPath;
 import org.sonar.api.scan.filesystem.PathResolver;
+import org.sonar.api.utils.MessageException;
 
 /**
  * Facade for all WS interaction with GitHub.
@@ -83,7 +84,8 @@ public void init(int pullRequestNumber, File projectBaseDir) {
       loadExistingReviewComments();
       patchPositionMappingByFile = mapPatchPositionsToLines(pr);
     } catch (IOException e) {
-      throw new IllegalStateException("Unable to perform GitHub WS operation", e);
+      LOG.debug("Unable to perform GitHub WS operation", e);
+      throw MessageException.of("Unable to perform GitHub WS operation: " + e.getMessage());
     }
   }