bazel: implement bazel build for the development mode.

In addition build bower_components.zip and fonts.zip: these are not
implicitly generated by the bazel build, so they have to be built
explicitly.

Tested:

1) Ran
  rm -rf bazel-bin/polygerrit-ui/polygerrit_components.bower_components.zip && \
  rm -f bazel-bin/polygerrit-ui/fonts.zip && \
  bazel build polygerrit && \
    $(bazel info output_base)/external/local_jdk/bin/java \
    -jar bazel-bin/polygerrit.war daemon --polygerrit-dev \
    -d ../gerrit_testsite --console-log --show-stack-trace

verified that test site loaded.

Change-Id: I3e220eed06bc956956095b946aafb20539ee4acd

gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/BazelBuild.java

@@ -17,16 +17,15 @@ package com.google.gerrit.httpd.raw;
 import java.io.IOException;
 import java.nio.file.Path;
 
-public class BazelBuild implements BuildSystem {
-  private final Path sourceRoot;
-
+public class BazelBuild extends BuildSystem {
   public BazelBuild(Path sourceRoot) {
-    this.sourceRoot = sourceRoot;
+    super(sourceRoot);
   }
 
   @Override
-  public void build(Label l) throws IOException, BuildFailureException {
-    throw new BuildFailureException("not implemented yet.".getBytes());
+  protected ProcessBuilder newBuildProcess(Label label) throws IOException {
+    ProcessBuilder proc = new ProcessBuilder("bazel", "build", label.fullName());
+    return proc;
   }
 
   @Override
@@ -54,4 +53,9 @@ public class BazelBuild implements BuildSystem {
   public Label fontZipLabel() {
     return new Label("polygerrit-ui", "fonts.zip");
   }
+
+  @Override
+  public String name() {
+    return "bazel";
+  }
 }

gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/BowerComponentsDevServlet.java

@@ -19,7 +19,6 @@ import com.google.gerrit.httpd.raw.BuildSystem.Label;
 import com.google.gerrit.launcher.GerritLauncher;
 
 import java.io.IOException;
-import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.Objects;
 
@@ -28,7 +27,6 @@ class BowerComponentsDevServlet extends ResourceServlet {
   private static final long serialVersionUID = 1L;
 
   private final Path bowerComponents;
-  private final String buildCommand;
   private final Path zip;
 
   BowerComponentsDevServlet(Cache<Path, Resource> cache,
@@ -36,25 +34,21 @@ class BowerComponentsDevServlet extends ResourceServlet {
     super(cache, true);
 
     Objects.requireNonNull(builder);
-    Label pgLabel = builder.polygerritComponents();
-    buildCommand = builder.buildCommand(pgLabel);
+    Label label = builder.polygerritComponents();
+    try {
+      builder.build(label);
+    } catch (BuildSystem.BuildFailureException e) {
+      throw new IOException(e);
+    }
 
-    zip = builder.targetPath(pgLabel);
-    if (zip == null || !Files.exists(zip)) {
-      bowerComponents = null;
-    } else {
-      bowerComponents = GerritLauncher
+    zip = builder.targetPath(label);
+    bowerComponents = GerritLauncher
           .newZipFileSystem(zip)
           .getPath("/");
-    }
   }
 
   @Override
   protected Path getResourcePath(String pathInfo) throws IOException {
-    if (bowerComponents == null) {
-      throw new IOException("No polymer components found: " + zip
-          + ". Run `" + buildCommand + "`?");
-    }
     return bowerComponents.resolve(pathInfo);
   }
 }

gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/BuckUtils.java

@@ -16,64 +16,28 @@ package com.google.gerrit.httpd.raw;
 
 import static com.google.common.base.MoreObjects.firstNonNull;
 
-import com.google.common.io.ByteStreams;
-import com.google.gerrit.common.TimeUtil;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.InterruptedIOException;
 import java.nio.file.Files;
 import java.nio.file.NoSuchFileException;
 import java.nio.file.Path;
 import java.util.Properties;
 
-class BuckUtils implements BuildSystem {
-  private static final Logger log =
-      LoggerFactory.getLogger(BuckUtils.class);
-  private final Path sourceRoot;
-
+class BuckUtils extends BuildSystem {
   BuckUtils(Path sourceRoot) {
-    this.sourceRoot = sourceRoot;
+    super(sourceRoot);
   }
 
   @Override
-  public void build(Label label)
-      throws IOException, BuildFailureException {
-    log.info("buck build " + label.fullName());
+  protected ProcessBuilder newBuildProcess(Label label) throws IOException {
     Properties properties = loadBuckProperties(
         sourceRoot.resolve("buck-out/gen/tools/buck/buck.properties"));
     String buck = firstNonNull(properties.getProperty("buck"), "buck");
-    ProcessBuilder proc = new ProcessBuilder(buck, "build", label.fullName())
-        .directory(sourceRoot.toFile())
-        .redirectErrorStream(true);
+    ProcessBuilder proc = new ProcessBuilder(buck, "build", label.fullName());
     if (properties.containsKey("PATH")) {
       proc.environment().put("PATH", properties.getProperty("PATH"));
     }
-    long start = TimeUtil.nowMs();
-    Process rebuild = proc.start();
-    byte[] out;
-    try (InputStream in = rebuild.getInputStream()) {
-      out = ByteStreams.toByteArray(in);
-    } finally {
-      rebuild.getOutputStream().close();
-    }
-
-    int status;
-    try {
-      status = rebuild.waitFor();
-    } catch (InterruptedException e) {
-      throw new InterruptedIOException("interrupted waiting for " + buck);
-    }
-    if (status != 0) {
-      throw new BuildFailureException(out);
-    }
-
-    long time = TimeUtil.nowMs() - start;
-    log.info(String.format("UPDATED    %s in %.3fs", label.fullName(),
-        time / 1000.0));
+    return proc;
   }
 
   private static Properties loadBuckProperties(Path propPath)
@@ -119,6 +83,11 @@ class BuckUtils implements BuildSystem {
 
   @Override
   public Label fontZipLabel() {
-      return new Label("polygerrit-ui", "fonts", "polygerrit-ui/fonts/fonts.zip");
+    return new Label("polygerrit-ui", "fonts", "polygerrit-ui/fonts/fonts.zip");
+  }
+
+  @Override
+  public String name() {
+    return "buck";
   }
 }

gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/BuildSystem.java

@@ -18,17 +18,65 @@ import static java.nio.charset.StandardCharsets.UTF_8;
 
 import com.google.common.escape.Escaper;
 import com.google.common.html.HtmlEscapers;
+import com.google.common.io.ByteStreams;
+import com.google.gerrit.common.TimeUtil;
 import com.google.gwtexpui.server.CacheHeaders;
 
 import org.eclipse.jgit.util.RawParseUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.InterruptedIOException;
 import java.io.PrintWriter;
 import java.nio.file.Path;
 
 import javax.servlet.http.HttpServletResponse;
 
-public interface BuildSystem {
+public abstract class BuildSystem {
+  private static final Logger log =
+      LoggerFactory.getLogger(BuildSystem.class);
+
+  protected final Path sourceRoot;
+
+  public BuildSystem(Path sourceRoot) {
+    this.sourceRoot = sourceRoot;
+  }
+
+  protected abstract ProcessBuilder newBuildProcess(Label l) throws IOException;
+
+  // builds the given label.
+  public void build(Label label)
+      throws IOException, BuildFailureException {
+    ProcessBuilder proc = newBuildProcess(label);
+    proc.directory(sourceRoot.toFile())
+        .redirectErrorStream(true);
+    log.info("building [" + name() + "] " + label.fullName());
+    long start = TimeUtil.nowMs();
+    Process rebuild = proc.start();
+    byte[] out;
+    try (InputStream in = rebuild.getInputStream()) {
+      out = ByteStreams.toByteArray(in);
+    } finally {
+      rebuild.getOutputStream().close();
+    }
+
+    int status;
+    try {
+      status = rebuild.waitFor();
+    } catch (InterruptedException e) {
+      throw new InterruptedIOException("interrupted waiting for " + proc.toString());
+    }
+    if (status != 0) {
+      log.warn("build failed: " + new String(out));
+      throw new BuildFailureException(out);
+    }
+
+    long time = TimeUtil.nowMs() - start;
+    log.info(String.format("UPDATED    %s in %.3fs", label.fullName(),
+        time / 1000.0));
+  }
 
   // Represents a label in either buck or bazel.
   class Label {
@@ -95,20 +143,20 @@ public interface BuildSystem {
   }
 
   /** returns the command to build given target */
-  String buildCommand(Label l);
-
-  /** builds the given label. */
-  void build(Label l) throws IOException, BuildFailureException;
+  abstract String buildCommand(Label l);
 
   /** returns the root relative path to the artifact for the given label */
-  Path targetPath(Label l);
+  abstract Path targetPath(Label l);
 
   /** Label for the agent specific GWT zip. */
-  Label gwtZipLabel(String agent);
+  abstract Label gwtZipLabel(String agent);
 
   /** Label for the polygerrit component zip. */
-  Label polygerritComponents();
+  abstract Label polygerritComponents();
 
   /** Label for the fonts zip file. */
-  Label fontZipLabel();
+  abstract Label fontZipLabel();
+
+  /** Build system name. */
+  abstract String name();
 }

gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/FontsDevServlet.java

@@ -32,7 +32,14 @@ class FontsDevServlet extends ResourceServlet {
     super(cache, true);
     Objects.requireNonNull(builder);
 
-    Path zip = builder.targetPath(builder.fontZipLabel());
+    BuildSystem.Label zipLabel = builder.fontZipLabel();
+    try {
+      builder.build(zipLabel);
+    } catch (BuildSystem.BuildFailureException e) {
+      throw new IOException(e);
+    }
+
+    Path zip = builder.targetPath(zipLabel);
     Objects.requireNonNull(zip);
 
     fonts = GerritLauncher.newZipFileSystem(zip).getPath("/");

polygerrit-ui/BUILD

@@ -22,3 +22,21 @@ bower_component_bundle(
     '//lib/js:polymer',
     '//lib/js:promise-polyfill',
 ])
+
+
+genrule2(
+  name = 'fonts',
+  cmd = ' && '.join([
+    'mkdir -p $$TMP/fonts',
+    'cp $(SRCS) $$TMP/fonts/',
+    'cd $$TMP',
+    "find fonts/ -exec touch -t 198001010000 '{}' ';'",
+    'zip -qr $$ROOT/$@ fonts',
+  ]),
+  srcs = [
+    '//lib/fonts:sourcecodepro',
+  ],
+  outs = ['fonts.zip',],
+  visibility = ['//visibility:public'],
+  output_to_bindir = 1,
+)