Merge pull request #6 from foghina/gradle_start_packager

Start packager from gradle plugin

Author: mkonicek

react-native-gradle/build.gradle

@@ -11,6 +11,7 @@ repositories {
 dependencies {
   compile gradleApi()
   compile 'commons-io:commons-io:2.4'
+  compile 'org.apache.commons:commons-lang3:3.4'
 
   testCompile 'junit:junit:4.12'
   testCompile 'com.squareup.okhttp:mockwebserver:2.4.0'

react-native-gradle/src/main/java/com/facebook/react/AbstractPackageJsTask.java

@@ -5,13 +5,15 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
 
 import org.apache.commons.io.FilenameUtils;
 import org.apache.commons.io.IOUtils;
+import org.apache.commons.lang3.SystemUtils;
 import org.gradle.api.DefaultTask;
 
 /**
@@ -20,12 +22,35 @@
  */
 public abstract class AbstractPackageJsTask extends DefaultTask {
 
+  /**
+   * Describes the status of the JS packager server.
+   *
+   * @see #getPackagerStatus
+   */
+  private enum PackagerStatus {
+    /**
+     * Packager is up and running
+     */
+    RUNNING,
+
+    /**
+     * Packager is not running, but could be started
+     */
+    NOT_RUNNING,
+
+    /**
+     * Packager is not running and can't be started, something else is listening on the configured
+     * port
+     */
+    UNKNOWN
+  }
+
   /**
    * Get a bundle from packager and copy it to the appropriate folder.
    *
    * @param debug whether this is a debug build or not
    */
-  protected void copyBundle(boolean debug) throws URISyntaxException, IOException {
+  protected void copyBundle(boolean debug) throws Exception {
     ReactGradleExtension config = getConfig();
     PackagerParams packagerParams = getPackagerParams(config, debug);
 
@@ -35,15 +60,81 @@ protected void copyBundle(boolean debug) throws URISyntaxException, IOException
             .separatorsToSystem("build/intermediates/assets/" + (debug ? "debug" : "release")));
     assets.mkdirs();
     File bundle = new File(assets, config.getBundleFileName());
-    System.out.println("Writing debug=" + debug + " bundle to " + bundle.getAbsolutePath());
 
-    URL packageUrl = getPackageUrl(config, packagerParams);
+    PackagerStatus packagerStatus = getPackagerStatus(config);
+    if (packagerStatus == PackagerStatus.NOT_RUNNING) {
+      boolean started = startPackager();
+      if (started) {
+        packagerStatus = getPackagerStatus(config);
+      }
+      if (!started || packagerStatus != PackagerStatus.RUNNING) {
+        throw new Exception(
+            "Could not start packager server. Please start it manually and try again.");
+      }
+    }
+    if (packagerStatus == PackagerStatus.RUNNING) {
+      URL packageUrl = getPackageUrl(config, packagerParams);
+
+      InputStream packageStream = packageUrl.openStream();
+      OutputStream bundleStream = new FileOutputStream(bundle);
+      IOUtils.copy(packageStream, bundleStream);
+      IOUtils.closeQuietly(packageStream);
+      IOUtils.closeQuietly(bundleStream);
+    } else if (packagerStatus == PackagerStatus.UNKNOWN) {
+      throw new Exception("Did not recognize the server at " + config.getPackagerHost() +
+          ". Please stop the service listening at this address and try again.");
+    }
+  }
 
-    InputStream packageStream = packageUrl.openStream();
-    OutputStream bundleStream = new FileOutputStream(bundle);
-    IOUtils.copy(packageStream, bundleStream);
-    IOUtils.closeQuietly(packageStream);
-    IOUtils.closeQuietly(bundleStream);
+  /**
+   * Tests if there is an HTTP server running at the configured address and if it is our packager.
+   * See {@link PackagerStatus} for the possible return values and their meaning.
+   *
+   * @param config the project config that contains packager address information
+   */
+  private PackagerStatus getPackagerStatus(ReactGradleExtension config) throws URISyntaxException {
+    try {
+      URL statusUrl = new URI("http", config.getPackagerHost(), "/status", null, null).toURL();
+      HttpURLConnection conn = (HttpURLConnection) statusUrl.openConnection();
+      if (conn.getResponseCode() != 200) {
+        // something else must be running on this port
+        return PackagerStatus.UNKNOWN;
+      }
+      InputStream is = conn.getInputStream();
+      String status = IOUtils.toString(is);
+      IOUtils.closeQuietly(is);
+      return status.contains("packager-status:running")
+          ? PackagerStatus.RUNNING
+          : PackagerStatus.UNKNOWN;
+    } catch (IOException e) {
+      // connect must have failed
+      return PackagerStatus.NOT_RUNNING;
+    }
+  }
+
+  /**
+   * Tries to spawn a process to run the packager server. Currently support OSX and Linux by running
+   * {@code open launchPackager.command} and {@code xterm -e bash launchPackager.command}
+   * respectively. Always waits 5 seconds for the server to finish initializing.
+   *
+   * @return {@code true} if the server process was started successfully, {@code false} otherwise.
+   */
+  private boolean startPackager() throws IOException, InterruptedException {
+    if (SystemUtils.IS_OS_MAC_OSX || SystemUtils.IS_OS_LINUX) {
+      File jsRoot = new File(getProject().getRootDir(), "..").getCanonicalFile();
+      String launchPackagerScript =
+          "node_modules/react-native/packager/launchPackager.command";
+      if (SystemUtils.IS_OS_MAC_OSX) {
+        Runtime.getRuntime().exec(new String[]{"open", launchPackagerScript}, null, jsRoot);
+      } else if (SystemUtils.IS_OS_LINUX) {
+        Runtime.getRuntime()
+            .exec(new String[]{"xterm", "-e", "bash", launchPackagerScript}, null, jsRoot);
+      }
+      // wait for server to be ready
+      Thread.sleep(5000);
+      return true;
+    }
+    return false;
   }
 
   /**

react-native-gradle/src/main/java/com/facebook/react/PackageDebugJsTask.java

@@ -1,8 +1,5 @@
 package com.facebook.react;
 
-import java.io.IOException;
-import java.net.URISyntaxException;
-
 import org.gradle.api.tasks.TaskAction;
 
 /**
@@ -11,7 +8,7 @@
 public class PackageDebugJsTask extends AbstractPackageJsTask {
 
   @TaskAction
-  public void packageJS() throws IOException, URISyntaxException {
+  public void packageJS() throws Exception {
     copyBundle(true);
   }
 }

react-native-gradle/src/main/java/com/facebook/react/PackageReleaseJsTask.java

@@ -1,8 +1,5 @@
 package com.facebook.react;
 
-import java.io.IOException;
-import java.net.URISyntaxException;
-
 import org.gradle.api.tasks.TaskAction;
 
 /**
@@ -11,7 +8,7 @@
 public class PackageReleaseJsTask extends AbstractPackageJsTask {
 
   @TaskAction
-  public void packageJS() throws IOException, URISyntaxException {
+  public void packageJS() throws Exception {
     copyBundle(false);
   }
 }