Rename WhoisServer and WhoisHttpServer to actions

These servlets are converted to actions during daggerization. Calling them servers are misleading.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=190942237

java/google/registry/whois/WhoisAction.java

@@ -0,0 +1,129 @@
+// Copyright 2017 The Nomulus Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package google.registry.whois;
+
+import static google.registry.request.Action.Method.POST;
+import static javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
+import static javax.servlet.http.HttpServletResponse.SC_OK;
+
+import com.google.appengine.api.datastore.DatastoreFailureException;
+import com.google.appengine.api.datastore.DatastoreTimeoutException;
+import com.google.common.net.MediaType;
+import google.registry.config.RegistryConfig.Config;
+import google.registry.request.Action;
+import google.registry.request.Response;
+import google.registry.request.auth.Auth;
+import google.registry.util.Clock;
+import google.registry.util.FormattingLogger;
+import google.registry.util.Retrier;
+import google.registry.whois.WhoisException.UncheckedWhoisException;
+import google.registry.whois.WhoisMetrics.WhoisMetric;
+import google.registry.whois.WhoisResponse.WhoisResponseResults;
+import java.io.Reader;
+import javax.inject.Inject;
+import org.joda.time.DateTime;
+
+/**
+ * HTTP request handler for WHOIS protocol requests sent to us by a proxy.
+ *
+ * <p>All commands and responses conform to the WHOIS spec as defined in RFC 3912. Commands must be
+ * sent via an HTTP POST in the request body.
+ *
+ * <p>This action is meant to serve as a low level interface for the proxy app which forwards us
+ * requests received on port 43. However this interface is technically higher level because it sends
+ * back proper HTTP error codes such as 200, 400, 500, etc. These are discarded by the proxy because
+ * WHOIS specifies no manner for differentiating successful and erroneous requests.
+ *
+ * @see WhoisHttpAction
+ * @see <a href="http://www.ietf.org/rfc/rfc3912.txt">RFC 3912: WHOIS Protocol Specification</a>
+ */
+@Action(path = "/_dr/whois", method = POST, auth = Auth.AUTH_INTERNAL_OR_ADMIN)
+public class WhoisAction implements Runnable {
+
+  private static final FormattingLogger logger = FormattingLogger.getLoggerForCallerClass();
+
+  /** WHOIS doesn't define an encoding, nor any way to specify an encoding in the protocol. */
+  static final MediaType CONTENT_TYPE = MediaType.PLAIN_TEXT_UTF_8;
+
+  /**
+   * As stated above, this is the low level interface intended for port 43, and as such, it
+   * always prefers ASCII.
+   */
+  static final boolean PREFER_UNICODE = false;
+
+  @Inject Clock clock;
+  @Inject Reader input;
+  @Inject Response response;
+  @Inject Retrier retrier;
+  @Inject WhoisReader whoisReader;
+  @Inject @Config("whoisDisclaimer") String disclaimer;
+  @Inject WhoisMetric.Builder metricBuilder;
+  @Inject WhoisMetrics whoisMetrics;
+
+  @Inject
+  WhoisAction() {}
+
+  @Override
+  public void run() {
+    String responseText;
+    final DateTime now = clock.nowUtc();
+    try {
+      final WhoisCommand command = whoisReader.readCommand(input, now);
+      metricBuilder.setCommand(command);
+      WhoisResponseResults results =
+          retrier.callWithRetry(
+              () -> {
+                WhoisResponseResults results1;
+                try {
+                  results1 = command.executeQuery(now).getResponse(PREFER_UNICODE, disclaimer);
+                } catch (WhoisException e) {
+                  throw new UncheckedWhoisException(e);
+                }
+                return results1;
+              },
+              DatastoreTimeoutException.class,
+              DatastoreFailureException.class);
+      responseText = results.plainTextOutput();
+      setWhoisMetrics(metricBuilder, results.numResults(), SC_OK);
+    } catch (UncheckedWhoisException u) {
+      WhoisException e = (WhoisException) u.getCause();
+      WhoisResponseResults results = e.getResponse(PREFER_UNICODE, disclaimer);
+      responseText = results.plainTextOutput();
+      setWhoisMetrics(metricBuilder, 0, e.getStatus());
+    } catch (WhoisException e) {
+      WhoisResponseResults results = e.getResponse(PREFER_UNICODE, disclaimer);
+      responseText = results.plainTextOutput();
+      setWhoisMetrics(metricBuilder, 0, e.getStatus());
+    } catch (Throwable t) {
+      logger.severe(t, "WHOIS request crashed");
+      responseText = "Internal Server Error";
+      setWhoisMetrics(metricBuilder, 0, SC_INTERNAL_SERVER_ERROR);
+    }
+    // Note that we always return 200 (OK) even if an error was hit. This is because returning an
+    // non-OK HTTP status code will cause the proxy server to silently close the connection. Since
+    // WHOIS has no way to return errors, it's better to convert any such errors into strings and
+    // return them directly.
+    response.setStatus(SC_OK);
+    response.setContentType(CONTENT_TYPE);
+    response.setPayload(responseText);
+    whoisMetrics.recordWhoisMetric(metricBuilder.build());
+  }
+
+  private static void setWhoisMetrics(
+      WhoisMetric.Builder metricBuilder, int numResults, int status) {
+    metricBuilder.setNumResults(numResults);
+    metricBuilder.setStatus(status);
+  }
+}