[odbcTransport.js] Add odbc transport

lib/transports/odbcTransport.js

@@ -0,0 +1,92 @@
+// Copyright (c) International Business Machines Corp. 2019
+// All Rights Reserved
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+// associated documentation files (the "Software"), to deal in the Software without restriction,
+// including without limitation the rights to use, copy, modify, merge, publish, distribute,
+// sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
+// NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+function odbcCall(config, xmlInput, done) {
+  // eslint-disable-next-line global-require
+  const { Connection } = require('odbc');
+
+  const {
+    host = 'localhost',
+    username = null,
+    password = null,
+    ipc = '*NA',
+    ctl = '*here',
+    xslib = 'QXMLSERV',
+    verbose = false,
+    dsn = null,
+  } = config;
+
+  const sql = `call ${xslib}.iPLUGR512K(?,?,?)`;
+  const driver = 'IBM i Access ODBC Driver';
+  let connectionString;
+
+  if (dsn && typeof dsn === 'string') {
+    connectionString = `DSN=${dsn}`;
+  } else {
+    connectionString = `DRIVER=${driver};SYSTEM=${host};`;
+
+    if (username && typeof username === 'string') {
+      connectionString += `UID=${username};`;
+    }
+    if (password && typeof password === 'string') {
+      connectionString += `PWD=${password};`;
+    }
+  }
+
+  if (verbose) {
+    console.log(`SQL to run is ${sql}`);
+  }
+
+  let connection;
+
+  // potentially throws an error with invalid SYSTEM, UID, PWD
+  try {
+    connection = new Connection(connectionString);
+  } catch (error) {
+    done(error, null);
+  }
+
+  connection.query(sql, [ipc, ctl, xmlInput], (queryError, results) => {
+    if (queryError) {
+      done(queryError, null);
+      return;
+    }
+
+    connection.close((closeError) => {
+      if (closeError) {
+        done(closeError, null);
+        return;
+      }
+
+      if (!results) {
+        done('Empty result set was returned', null);
+        return;
+      }
+
+      let xmlOutput = '';
+
+      results.forEach((chunk) => {
+        xmlOutput += chunk.OUT151;
+      });
+
+      done(null, xmlOutput);
+    });
+  });
+}
+
+exports.odbcCall = odbcCall;