Vert.x 示例

吳X發表於2017-10-09

//filename: MainVerticle.java

package io.vertx.guides.wiki;

import io.vertx.core.AbstractVerticle;
import io.vertx.core.DeploymentOptions;
import io.vertx.core.Future;

/**
 * @author <a href="https://julien.ponge.org/">Julien Ponge</a>
 */
// tag::main[]
public class MainVerticle extends AbstractVerticle {

  @Override
  public void start(Future<Void> startFuture) throws Exception {

    Future<String> dbVerticleDeployment = Future.future();  // <1>
    vertx.deployVerticle(new WikiDatabaseVerticle(), dbVerticleDeployment.completer());  // <2>

    dbVerticleDeployment.compose(id -> {  // <3>

      Future<String> httpVerticleDeployment = Future.future();
      vertx.deployVerticle(
        "io.vertx.guides.wiki.HttpServerVerticle",  // <4>
        new DeploymentOptions().setInstances(3),    // <5>
        httpVerticleDeployment.completer());

      return httpVerticleDeployment;  // <6>

    }).setHandler(ar -> {   // <7>
      if (ar.succeeded()) {
        startFuture.complete();
      } else {
        startFuture.fail(ar.cause());
      }
    });
  }
}

//filename: HttpServerVerticle.java

package io.vertx.guides.wiki;

import com.github.rjeschke.txtmark.Processor;
import io.vertx.core.AbstractVerticle;
import io.vertx.core.Future;
import io.vertx.core.eventbus.DeliveryOptions;
import io.vertx.core.http.HttpServer;
import io.vertx.core.json.JsonObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import io.vertx.ext.web.Router;
import io.vertx.ext.web.RoutingContext;
import io.vertx.ext.web.handler.BodyHandler;
import io.vertx.ext.web.templ.FreeMarkerTemplateEngine;

import java.util.Date;

/**
 * @author <a href="https://julien.ponge.org/">Julien Ponge</a>
 */
// tag::start[]
public class HttpServerVerticle extends AbstractVerticle {

  private static final Logger LOGGER = LoggerFactory.getLogger(HttpServerVerticle.class);

  public static final String CONFIG_HTTP_SERVER_PORT = "http.server.port";  // <1>
  public static final String CONFIG_WIKIDB_QUEUE = "wikidb.queue";

  private String wikiDbQueue = "wikidb.queue";

  @Override
  public void start(Future<Void> startFuture) throws Exception {

    wikiDbQueue = config().getString(CONFIG_WIKIDB_QUEUE, "wikidb.queue");  // <2>

    HttpServer server = vertx.createHttpServer();

    Router router = Router.router(vertx);
    router.get("/").handler(this::indexHandler);
    router.get("/wiki/:page").handler(this::pageRenderingHandler);
    router.get("/test/:msg").handler(this::pageTestHandler);
    router.post().handler(BodyHandler.create());
    router.post("/save").handler(this::pageUpdateHandler);
    router.post("/create").handler(this::pageCreateHandler);
    router.post("/delete").handler(this::pageDeletionHandler);

    int portNumber = config().getInteger(CONFIG_HTTP_SERVER_PORT, 8080);  // <3>
    server
      .requestHandler(router::accept)
      .listen(portNumber, ar -> {
        if (ar.succeeded()) {
          LOGGER.info("HTTP server running on port " + portNumber);
          startFuture.complete();
        } else {
          LOGGER.error("Could not start a HTTP server", ar.cause());
          startFuture.fail(ar.cause());
        }
      });
  }

  // (...)
  // end::start[]

  // tag::indexHandler[]
  private final FreeMarkerTemplateEngine templateEngine = FreeMarkerTemplateEngine.create();

  private void indexHandler(RoutingContext context) {
    LOGGER.info("首頁");

    DeliveryOptions options = new DeliveryOptions().addHeader("action", "all-pages"); // <2>

    vertx.eventBus().send(wikiDbQueue, new JsonObject(), options, reply -> {  // <1>
      if (reply.succeeded()) {
        JsonObject body = (JsonObject) reply.result().body();   // <3>
        context.put("title", "Wiki home");
        context.put("pages", body.getJsonArray("pages").getList());
        templateEngine.render(context, "templates", "/index.ftl", ar -> {
          if (ar.succeeded()) {
            context.response().putHeader("Content-Type", "text/html");
            context.response().end(ar.result());
          } else {
            context.fail(ar.cause());
          }
        });
      } else {
        context.fail(reply.cause());
      }
    });
  }
  // end::indexHandler[]

  // tag::rest[]
  private static final String EMPTY_PAGE_MARKDOWN =
  "# A new page\n" +
    "\n" +
    "Feel-free to write in Markdown!\n";



  private void pageTestHandler(RoutingContext context) {
    String msg = context.request().getParam("msg");
    LOGGER.info(msg);
    JsonObject message = new JsonObject().put("msg",msg);   // message body
    DeliveryOptions options = new DeliveryOptions().addHeader("action","test-msg");
    vertx.eventBus().send("wikidb.queue",message,options, reply ->{
      if(reply.succeeded()){
        JsonObject body = (JsonObject) reply.result().body();
        context.response().putHeader("Content-Type", "text/html;charset=utf-8");
        context.response().end(body.getString("msg"));
      }
      else{
        context.fail(reply.cause());
      }
    });
  }

  private void pageRenderingHandler(RoutingContext context) {

    String requestedPage = context.request().getParam("page");
    JsonObject request = new JsonObject().put("page", requestedPage);

    DeliveryOptions options = new DeliveryOptions().addHeader("action", "get-page");
    vertx.eventBus().send(wikiDbQueue, request, options, reply -> {

      if (reply.succeeded()) {
        JsonObject body = (JsonObject) reply.result().body();

        boolean found = body.getBoolean("found");
        String rawContent = body.getString("rawContent", EMPTY_PAGE_MARKDOWN);
        context.put("title", requestedPage);
        context.put("id", body.getInteger("id", -1));
        context.put("newPage", found ? "no" : "yes");
        context.put("rawContent", rawContent);
        context.put("content", Processor.process(rawContent));
        context.put("timestamp", new Date().toString());

        templateEngine.render(context, "templates","/page.ftl", ar -> {
          if (ar.succeeded()) {
            context.response().putHeader("Content-Type", "text/html");
            context.response().end(ar.result());
          } else {
            context.fail(ar.cause());
          }
        });

      } else {
        context.fail(reply.cause());
      }
    });
  }

  private void pageUpdateHandler(RoutingContext context) {

    String title = context.request().getParam("title");
    JsonObject request = new JsonObject()
      .put("id", context.request().getParam("id"))
      .put("title", title)
      .put("markdown", context.request().getParam("markdown"));

    DeliveryOptions options = new DeliveryOptions();
    if ("yes".equals(context.request().getParam("newPage"))) {
      options.addHeader("action", "create-page");
    } else {
      options.addHeader("action", "save-page");
    }

    vertx.eventBus().send(wikiDbQueue, request, options, reply -> {
      if (reply.succeeded()) {
        context.response().setStatusCode(303);
        context.response().putHeader("Location", "/wiki/" + title);
        context.response().end();
      } else {
        context.fail(reply.cause());
      }
    });
  }

  private void pageCreateHandler(RoutingContext context) {
    String pageName = context.request().getParam("name");
    String location = "/wiki/" + pageName;
    if (pageName == null || pageName.isEmpty()) {
      location = "/";
    }
    context.response().setStatusCode(303);
    context.response().putHeader("Location", location);
    context.response().end();
  }

  private void pageDeletionHandler(RoutingContext context) {
    String id = context.request().getParam("id");
    JsonObject request = new JsonObject().put("id", id);
    DeliveryOptions options = new DeliveryOptions().addHeader("action", "delete-page");
    vertx.eventBus().send(wikiDbQueue, request, options, reply -> {
      if (reply.succeeded()) {
        context.response().setStatusCode(303);
        context.response().putHeader("Location", "/");
        context.response().end();
      } else {
        context.fail(reply.cause());
      }
    });
  }
  // end::rest[]
}

//filename: WikiDatabaseVerticle.java

package io.vertx.guides.wiki;

import io.vertx.core.AbstractVerticle;
import io.vertx.core.Future;
import io.vertx.core.eventbus.Message;
import io.vertx.core.json.JsonArray;
import io.vertx.core.json.JsonObject;
import io.vertx.ext.jdbc.JDBCClient;
import io.vertx.ext.sql.ResultSet;
import io.vertx.ext.sql.SQLConnection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Properties;
import java.util.stream.Collectors;

/**
 * @author <a href="https://julien.ponge.org/">Julien Ponge</a>
 */
// tag::preamble[]
public class WikiDatabaseVerticle extends AbstractVerticle {

  public static final String CONFIG_WIKIDB_JDBC_URL = "wikidb.jdbc.url";
  public static final String CONFIG_WIKIDB_JDBC_DRIVER_CLASS = "wikidb.jdbc.driver_class";
  public static final String CONFIG_WIKIDB_JDBC_MAX_POOL_SIZE = "wikidb.jdbc.max_pool_size";
  public static final String CONFIG_WIKIDB_SQL_QUERIES_RESOURCE_FILE = "wikidb.sqlqueries.resource.file";

  public static final String CONFIG_WIKIDB_QUEUE = "wikidb.queue";

  private static final Logger LOGGER = LoggerFactory.getLogger(WikiDatabaseVerticle.class);

  // (...)
  // end::preamble[]

  // tag::loadSqlQueries[]
  private enum SqlQuery {
    CREATE_PAGES_TABLE,
    ALL_PAGES,
    GET_PAGE,
    CREATE_PAGE,
    SAVE_PAGE,
    DELETE_PAGE
  }

  private final HashMap<SqlQuery, String> sqlQueries = new HashMap<>();

  private void loadSqlQueries() throws IOException {

    String queriesFile = config().getString(CONFIG_WIKIDB_SQL_QUERIES_RESOURCE_FILE);
    InputStream queriesInputStream;
    if (queriesFile != null) {
      queriesInputStream = new FileInputStream(queriesFile);
    } else {
      queriesInputStream = getClass().getResourceAsStream("/db-queries.properties");
    }

    Properties queriesProps = new Properties();
    queriesProps.load(queriesInputStream);
    queriesInputStream.close();

    sqlQueries.put(SqlQuery.CREATE_PAGES_TABLE, queriesProps.getProperty("create-pages-table"));
    sqlQueries.put(SqlQuery.ALL_PAGES, queriesProps.getProperty("all-pages"));
    sqlQueries.put(SqlQuery.GET_PAGE, queriesProps.getProperty("get-page"));
    sqlQueries.put(SqlQuery.CREATE_PAGE, queriesProps.getProperty("create-page"));
    sqlQueries.put(SqlQuery.SAVE_PAGE, queriesProps.getProperty("save-page"));
    sqlQueries.put(SqlQuery.DELETE_PAGE, queriesProps.getProperty("delete-page"));
  }
  // end::loadSqlQueries[]

  // tag::start[]
  private JDBCClient dbClient;

  @Override
  public void start(Future<Void> startFuture) throws Exception {

    /*
     * Note: this uses blocking APIs, but data is small...
     */
    loadSqlQueries();  // <1>

    dbClient = JDBCClient.createShared(vertx, new JsonObject()
      .put("url", config().getString(CONFIG_WIKIDB_JDBC_URL, "jdbc:hsqldb:file:db/wiki"))
      .put("driver_class", config().getString(CONFIG_WIKIDB_JDBC_DRIVER_CLASS, "org.hsqldb.jdbcDriver"))
      .put("max_pool_size", config().getInteger(CONFIG_WIKIDB_JDBC_MAX_POOL_SIZE, 30)));

    dbClient.getConnection(ar -> {
      if (ar.failed()) {
        LOGGER.error("Could not open a database connection", ar.cause());
        startFuture.fail(ar.cause());
      } else {
        SQLConnection connection = ar.result();
        connection.execute(sqlQueries.get(SqlQuery.CREATE_PAGES_TABLE), create -> {   // <2>
          connection.close();
          if (create.failed()) {
            LOGGER.error("Database preparation error", create.cause());
            startFuture.fail(create.cause());
          } else {
            vertx.eventBus().consumer(config().getString(CONFIG_WIKIDB_QUEUE, "wikidb.queue"), this::onMessage);  // <3>
            startFuture.complete();
          }
        });
      }
    });
  }
  // end::start[]

  // tag::onMessage[]
  public enum ErrorCodes {
    NO_ACTION_SPECIFIED,
    BAD_ACTION,
    DB_ERROR
  }

  public void onMessage(Message<JsonObject> message) {

    if (!message.headers().contains("action")) {
      LOGGER.error("No action header specified for message with headers {} and body {}",
        message.headers(), message.body().encodePrettily());
      message.fail(ErrorCodes.NO_ACTION_SPECIFIED.ordinal(), "No action header specified");
      return;
    }
    String action = message.headers().get("action");

    switch (action) {
      case "all-pages":
        fetchAllPages(message);
        break;
      case "get-page":
        fetchPage(message);
        break;
      case "test-msg":
        testMsg(message);
        break;
      case "create-page":
        createPage(message);
        break;
      case "save-page":
        savePage(message);
        break;
      case "delete-page":
        deletePage(message);
        break;
      default:
        message.fail(ErrorCodes.BAD_ACTION.ordinal(), "Bad action: " + action);
    }
  }
  // end::onMessage[]

  // tag::rest[]
  private void fetchAllPages(Message<JsonObject> message) {

    dbClient.getConnection(car -> {
      if (car.succeeded()) {
        SQLConnection connection = car.result();
        connection.query(sqlQueries.get(SqlQuery.ALL_PAGES), res -> {
          connection.close();
          if (res.succeeded()) {
            List<String> pages = res.result()
              .getResults()
              .stream()
              .map(json -> json.getString(0))
              .sorted()
              .collect(Collectors.toList());
            message.reply(new JsonObject().put("pages", new JsonArray(pages)));
          } else {
            reportQueryError(message, res.cause());
          }
        });
      } else {
        reportQueryError(message, car.cause());
      }
    });
  }

  private void testMsg(Message<JsonObject> message) {
    String msg = message.body().getString("msg");
    LOGGER.info(msg);
    if (!"error".equals(msg)) {
      JsonObject response = new JsonObject();
      response.put("msg", "您好,我是WikiDatabaseVerticle: " + msg);
      message.reply(response);
    } else {
      message.fail(-1, "你的輸入有誤!");
    }
  }

  private void fetchPage(Message<JsonObject> message) {

    String requestedPage = message.body().getString("page");

    dbClient.getConnection(car -> {
      if (car.succeeded()) {
        SQLConnection connection = car.result();
        connection.queryWithParams(sqlQueries.get(SqlQuery.GET_PAGE), new JsonArray().add(requestedPage), fetch -> {
          connection.close();
          if (fetch.succeeded()) {
            JsonObject response = new JsonObject();
            ResultSet resultSet = fetch.result();
            if (resultSet.getNumRows() == 0) {
              response.put("found", false);
            } else {
              response.put("found", true);
              JsonArray row = resultSet.getResults().get(0);
              response.put("id", row.getInteger(0));
              response.put("rawContent", row.getString(1));
            }
            message.reply(response);
          } else {
            reportQueryError(message, fetch.cause());
          }
        });
      } else {
        reportQueryError(message, car.cause());
      }
    });

  }

  private void createPage(Message<JsonObject> message) {
    JsonObject request = message.body();

    dbClient.getConnection(car -> {

      if (car.succeeded()) {
        SQLConnection connection = car.result();
        JsonArray data = new JsonArray()
          .add(request.getString("title"))
          .add(request.getString("markdown"));

        connection.updateWithParams(sqlQueries.get(SqlQuery.CREATE_PAGE), data, res -> {
          connection.close();
          if (res.succeeded()) {
            message.reply("ok");
          } else {
            reportQueryError(message, res.cause());
          }
        });
      } else {
        reportQueryError(message, car.cause());
      }
    });
  }

  private void savePage(Message<JsonObject> message) {
    JsonObject request = message.body();

    dbClient.getConnection(car -> {

      if (car.succeeded()) {
        SQLConnection connection = car.result();
        JsonArray data = new JsonArray()
          .add(request.getString("markdown"))
          .add(request.getString("id"));

        connection.updateWithParams(sqlQueries.get(SqlQuery.SAVE_PAGE), data, res -> {
          connection.close();
          if (res.succeeded()) {
            message.reply("ok");
          } else {
            reportQueryError(message, res.cause());
          }
        });
      } else {
        reportQueryError(message, car.cause());
      }
    });
  }

  private void deletePage(Message<JsonObject> message) {
    dbClient.getConnection(car -> {
      if (car.succeeded()) {
        SQLConnection connection = car.result();
        JsonArray data = new JsonArray().add(message.body().getString("id"));
        connection.updateWithParams(sqlQueries.get(SqlQuery.DELETE_PAGE), data, res -> {
          connection.close();
          if (res.succeeded()) {
            message.reply("ok");
          } else {
            reportQueryError(message, res.cause());
          }
        });
      } else {
        reportQueryError(message, car.cause());
      }
    });
  }

  private void reportQueryError(Message<JsonObject> message, Throwable cause) {
    LOGGER.error("Database query error", cause);
    message.fail(ErrorCodes.DB_ERROR.ordinal(), cause.getMessage());
  }
  // end::rest[]
}

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