265 lines
9.5 KiB
JavaScript
265 lines
9.5 KiB
JavaScript
/* Copyright (c) 2015, 2022, Oracle and/or its affiliates. */
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/******************************************************************************
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*
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* This software is dual-licensed to you under the Universal Permissive License
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* (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl and Apache License
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* 2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose
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* either license.
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*
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* If you elect to accept the software under the Apache License, Version 2.0,
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* the following applies:
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* NAME
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* webapp.js
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*
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* DESCRIPTION
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* A web based application displaying banana harvest details.
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*
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* The script creates an HTTP server listening on port 7000 and accepts a URL
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* parameter for the banana farmer ID, for example: http://localhost:7000/3
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*
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* In some networks forced pool termination may hang unless you have
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* 'disable_oob=on' in sqlnet.ora, see
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* https://oracle.github.io/node-oracledb/doc/api.html#tnsadmin
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*
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* In production applications, set poolMin=poolMax (and poolIncrement=0)
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*
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* This example requires node-oracledb 5 or later.
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*
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* This example uses Node 8's async/await syntax.
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*
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*****************************************************************************/
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// If you increase poolMax, you must increase UV_THREADPOOL_SIZE before Node.js
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// starts its thread pool. If you set UV_THREADPOOL_SIZE too late, the value is
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// ignored and the default size of 4 is used.
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// process.env.UV_THREADPOOL_SIZE = 10; // set threadpool size to 10
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//
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// Note on Windows you must set the UV_THREADPOOL_SIZE environment variable before
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// running your application.
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const fs = require('fs');
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const http = require('http');
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const oracledb = require('oracledb');
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const dbConfig = require('./dbconfig.js');
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const demoSetup = require('./demosetup.js');
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// On Windows and macOS, you can specify the directory containing the Oracle
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// Client Libraries at runtime, or before Node.js starts. On other platforms
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// the system library search path must always be set before Node.js is started.
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// See the node-oracledb installation documentation.
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// If the search path is not correct, you will get a DPI-1047 error.
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let libPath;
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if (process.platform === 'win32') { // Windows
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libPath = 'C:\\oracle\\instantclient_19_12';
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} else if (process.platform === 'darwin') { // macOS
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libPath = process.env.HOME + '/Downloads/instantclient_19_8';
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}
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if (libPath && fs.existsSync(libPath)) {
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oracledb.initOracleClient({ libDir: libPath });
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}
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const httpPort = 7000;
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// If additionally using Database Resident Connection Pooling (DRCP), then set a connection class:
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// oracledb.connectionClass = 'MYAPPNAME';
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// Main entry point. Creates a connection pool and an HTTP server
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// that executes a query based on the URL parameter given.
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// The pool values shown are the default values.
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async function init() {
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try {
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await oracledb.createPool({
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user: dbConfig.user,
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password: dbConfig.password,
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connectString: dbConfig.connectString
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// edition: 'ORA$BASE', // used for Edition Based Redefintion
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// events: false, // whether to handle Oracle Database FAN and RLB events or support CQN
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// externalAuth: false, // whether connections should be established using External Authentication
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// homogeneous: true, // all connections in the pool have the same credentials
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// poolAlias: 'default', // set an alias to allow access to the pool via a name.
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// poolIncrement: 1, // only grow the pool by one connection at a time
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// poolMax: 4, // maximum size of the pool. Increase UV_THREADPOOL_SIZE if you increase poolMax
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// poolMin: 0, // start with no connections; let the pool shrink completely
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// poolPingInterval: 60, // check aliveness of connection if idle in the pool for 60 seconds
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// poolTimeout: 60, // terminate connections that are idle in the pool for 60 seconds
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// queueMax: 500, // don't allow more than 500 unsatisfied getConnection() calls in the pool queue
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// queueTimeout: 60000, // terminate getConnection() calls queued for longer than 60000 milliseconds
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// sessionCallback: initSession, // function invoked for brand new connections or by a connection tag mismatch
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// sodaMetaDataCache: false, // Set true to improve SODA collection access performance
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// stmtCacheSize: 30, // number of statements that are cached in the statement cache of each connection
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// enableStatistics: false // record pool usage for oracledb.getPool().getStatistics() and logStatistics()
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});
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// create the demo table
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const connection = await oracledb.getConnection();
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await demoSetup.setupBf(connection);
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await connection.close();
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// Create HTTP server and listen on port httpPort
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const server = http.createServer();
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server.on('error', (err) => {
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console.log('HTTP server problem: ' + err);
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});
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server.on('request', (request, response) => {
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handleRequest(request, response);
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});
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await server.listen(httpPort);
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console.log("Server is running at http://localhost:" + httpPort);
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console.log("Try loading a farmer such as http://localhost:" + httpPort + "/3");
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} catch (err) {
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console.error("init() error: " + err.message);
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}
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}
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// initSession() is configured by the pool sessionCallback property.
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// It will be invoked internally when each brand new pooled connection
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// is first used. See the sessionfixup.js and sessiontaggingX.js examples.
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/*
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function initSession(connection, requestedTag, cb) {
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connection.execute(`ALTER SESSION SET ...'`, cb);
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}
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*/
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async function handleRequest(request, response) {
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const urlparts = request.url.split("/");
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const id = urlparts[1];
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if (id == 'favicon.ico') { // ignore requests for the icon
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return;
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}
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if (id != parseInt(id)) {
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handleError(
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response,
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'URL path "' + id + '" is not an integer. Try http://localhost:' + httpPort + '/3',
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null
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);
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return;
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}
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let connection;
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try {
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// Checkout a connection from the default pool
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connection = await oracledb.getConnection();
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const result = await connection.execute(
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`SELECT farmer, weight, ripeness, picked
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FROM no_banana_farmer
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WHERE id = :idbv`,
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[id] // bind variable value
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);
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displayResults(
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response,
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"Banana Farmer Demonstration",
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"Example using node-oracledb driver",
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result,
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id);
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} catch (err) {
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handleError(response, "handleRequest() error", err);
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} finally {
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if (connection) {
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try {
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// Release the connection back to the connection pool
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await connection.close();
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} catch (err) {
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console.error(err);
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}
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}
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}
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}
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// Display query results
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function displayResults(response, title, caption, result, id) {
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response.writeHead(200, {"Content-Type": "text/html"});
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response.write("<!DOCTYPE html>");
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response.write("<html>");
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response.write("<head>");
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response.write("<style>" +
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"body {background:#FFFFFF;color:#000000;font-family:Arial,sans-serif;margin:40px;padding:10px;font-size:12px;text-align:center;}" +
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"h1 {margin:0px;margin-bottom:12px;background:#FF0000;text-align:center;color:#FFFFFF;font-size:28px;}" +
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"table {border-collapse: collapse; margin-left:auto; margin-right:auto;}" +
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"td, th {padding:8px;border-style:solid}" +
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"</style>\n");
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response.write("<title>" + caption + "</title>");
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response.write("</head>");
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response.write("<body>");
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response.write("<h1>" + title + "</h1>");
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response.write("<h2>" + "Harvest details for farmer " + id + "</h2>");
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response.write("<table>");
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// Column Titles
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response.write("<tr>");
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for (let col = 0; col < result.metaData.length; col++) {
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response.write("<th>" + result.metaData[col].name + "</th>");
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}
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response.write("</tr>");
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// Rows
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for (let row = 0; row < result.rows.length; row++) {
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response.write("<tr>");
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for (let col = 0; col < result.rows[row].length; col++) {
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response.write("<td>" + result.rows[row][col] + "</td>");
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}
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response.write("</tr>");
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}
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response.write("</table>");
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response.write("</body>\n</html>");
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response.end();
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}
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// Report an error
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function handleError(response, text, err) {
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if (err) {
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text += ": " + err.message;
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}
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console.error(text);
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response.writeHead(500, {"Content-Type": "text/html"});
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response.write(text);
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response.end();
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}
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async function closePoolAndExit() {
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console.log("\nTerminating");
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try {
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// Get the pool from the pool cache and close it when no
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// connections are in use, or force it closed after 10 seconds.
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// If this hangs, you may need DISABLE_OOB=ON in a sqlnet.ora file.
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// This setting should not be needed if both Oracle Client and Oracle
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// Database are 19c (or later).
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await oracledb.getPool().close(10);
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console.log("Pool closed");
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process.exit(0);
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} catch (err) {
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console.error(err.message);
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process.exit(1);
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}
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}
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process
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.once('SIGTERM', closePoolAndExit)
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.once('SIGINT', closePoolAndExit);
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init();
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