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| 'use strict';
/*
* This radically inappropriately named 'jdbc' module is roughly
* analogous to the AbstractJdbcHelper class (and friends) in the Java
* executor package. It is responsible for delivering the appropriate
* mysql (or whatever) queries, and calling context.succeed (or
* context.fail) with correct data.
*/
const _ = require('lodash');
const util = require('./util');
const mysql = require('mysql');
const psql = require('pg');
const named = require('node-postgres-named');
exports.send = (context, output) => {
if (isSchemaRequest(context, output)) {
requestSchema(context, output);
} else if (isValidateConnection(context, output)) {
validateConnection(context, output);
} else {
requestJdbc(context, output);
}
};
const isSchemaRequest = (context, output) => {
// TODO
return false;
};
const requestSchema = (context, output) => {
// TODO
};
const isValidateConnection = (context, output) => {
// TODO
return false;
};
const validateConnection = (context, output) => {
};
const requestJdbc = (context, output) => {
if (isNamedQuery(context, output)) {
executeNamedQuery(context, output);
} else if (isQuery(context, output)) {
const script = getScript(context, output);
if (_.isEmpty(script)) {
return context.fail({error: `No script found for JDBC query`});
}
// TODO: Set MAX_ROWS
execute(script, context, output);
} else if (isGetAll(context, output)) {
executeGetAll(context, output);
} else if (isGetById(context, output)) {
executeGetById(context, output);
} else if (isDelete(context, output)) {
executeDelete(context, output);
} else if (isInsert(context, output)) {
executeInsert(context, output);
} else Eif (isUpdate(context, output)) {
executeUpdate(context, output);
}
};
exports.requestJdbc = (context, output) => requestJdbc(context, output);
const isQuery = (context, output) => {
return (output.resource.method || '').toUpperCase() === 'POST' &&
(output.resource.path || '').endsWith('/query');
};
exports.isQuery = (context, output) => isQuery(context, output);
const getScript = (context, output) => {
return (output.query || {}).script || (output.input.body || '').toString();
};
exports.getScript = (context, output) => getScript(context, output);
const isNamedQuery = (context, output) => {
const vpUpper = (output.input.sql || output.resource.vendorPath || '')
.trim().toUpperCase();
return vpUpper.startsWith("INSERT") || vpUpper.startsWith("UPDATE") ||
vpUpper.startsWith("DELETE") || vpUpper.startsWith("SELECT") ||
(vpUpper.indexOf('(') !== -1 && vpUpper.indexOf(')') !== -1);
};
exports.isNamedQuery = (context, output) => isNamedQuery(context, output);
const isGetAll = (context, output) => {
return (output.resource.method || 'GET').toUpperCase() === 'GET' &&
!(output.resource.path || '').endsWith('/{objectId}') &&
!(output.resource.path || '').endsWith('/{id}');
};
exports.isGetAll = (context, output) => isGetAll(context, output);
const isGetById = (context, output) => {
return (output.resource.method || 'GET').toUpperCase() === 'GET' &&
((output.resource.path || '').endsWith('/{objectId}') ||
(output.resource.path || '').endsWith('/{id}'));
};
exports.isGetById = (context, output) => isGetById(context, output);
const isDelete = (context, output) => {
return (output.resource.method || '').toUpperCase() === 'DELETE';
};
exports.isDelete = (context, output) => isDelete(context, output);
const isInsert = (context, output) => {
return (output.resource.method || '').toUpperCase() === 'POST';
};
exports.isInsert = (context, output) => isInsert(context, output);
const isUpdate = (context, output) => {
return (output.resource.method || '').toUpperCase() === 'PATCH';
};
exports.isUpdate = (context, output) => isUpdate(context, output);
const executeNamedQuery = (context, output) => {
const scriptNamedValues = findNamedValues(context, output);
const script = scriptNamedValues[0];
const namedValues = scriptNamedValues[1];
if (script.toUpperCase().indexOf('RETURNING') !== -1) {
// we are hosed: mysql doesn't support "returning"
output.fail("Returning unsupported in mysql");
} else {
withConnection(context, output, (conn, cb) => {
console.log("in with conn", script, namedValues);
conn.query(script, namedValues, cb);
}, standardResponse(context, output));
}
};
exports.executeNamedQuery = (context, output) => executeNamedQuery(context, output);
const execute = (script, context, output) => {
withConnection(context, output, (conn, cb) => { conn.query(script, cb); },
standardResponse(context, output));
};
exports.execute = (script, context, output) => execute(script, context, output);
const executeGetAll = (context, output) => {
const orderBy = (output.query || {}).orderBy || '';
let whereClause = (output.query || {}).where || '';
if (!_.isEmpty(whereClause)) { whereClause = " where " + whereClause; }
let tname = (output.input.mappedPaths || {}).objectName;
if (_.isEmpty(tname)) {
return context.fail({error: "No `objectName` value found."});
}
const fields = findFields(context, output, tname);
let page = parseInt((output.input.query || {}).page);
if (isNaN(page)) { page = 1; }
let pageSize = parseInt((output.input.query || {}).pageSize);
if (isNaN(pageSize)) { pageSize = 50; }
const offset = pageOffset(page, pageSize);
let script;
if (!_.isEmpty(orderBy)) {
script = `select ${fields} from ${tname}${whereClause} ` +
`order by ${orderBy} limit ${pageSize} offset ${offset}`;
} else {
script = `select ${fields} from ${tname}${whereClause} ` +
`limit ${pageSize} offset ${offset}`;
}
withConnection(context, output, (conn, cb) => {
conn.query(script, cb);
}, standardResponse(context, output));
};
exports.executeGetAll = (context, output) => executeGetAll(context, output);
const executeGetById = (context, output) => {
let tname = (output.input.mappedPaths || {}).objectName;
if (_.isEmpty(tname)) {
return context.fail({error: "No `objectName` value found."});
}
let objectId = (output.query || {}).objectId;
if (_.isEmpty(objectId)) {
return context.fail({error: `No ID found in query for ${tname}.`});
}
const pk = findPk(context, output, tname);
if (_.isEmpty(pk)) {
return context.fail({error: `No PK found in query for ${tname}.`});
}
const fields = findFields(context, output, tname);
const script = `select ${fields} from ${tname} where ${pk} = :val limit 1`;
withConnection(context, output, (conn, cb) => {
conn.query(script, {val: objectId}, cb);
}, standardResponse(context, output));
};
exports.executeGetById = (context, output) => executeGetById(context, output);
const executeDelete = (context, output) => {
let tname = (output.input.mappedPaths || {}).objectName;
if (_.isEmpty(tname)) {
return context.fail({error: "No `objectName` value found."});
}
let objectId = (output.query || {}).objectId;
if (_.isEmpty(objectId) && !_.isNumber(objectId)) {
return context.fail({error: `No ID found in query for ${tname}.`});
}
const pk = findPk(context, output, tname);
if (_.isEmpty(pk)) {
return context.fail({error: `No PK found in query for ${tname}.`});
}
const script = `delete from ${tname} where ${pk} = :val`;
withConnection(context, output, (conn, cb) => {
conn.query(script, {val: objectId}, cb);
}, standardResponse(context, output));
};
exports.executeDelete = (context, output) => executeDelete(context, output);
const executeInsert = (context, output) => {
let tname = (output.input.mappedPaths || {}).objectName;
if (_.isEmpty(tname)) {
return context.fail({error: "No `objectName` value found."});
}
const body = output.body || {};
const ks = Object.keys(body);
const kstr = ks.join(',');
const vstr = ks.map(k => `:${k}`).join(',');
let script = `insert into ${tname} (${kstr}) values (${vstr})`;
// const pk = findPk(context, output, tname);
// TODO: append " returning ${pk}" for DBs that support it
withConnection(context, output, (conn, cb) => {
conn.query(script, body, cb);
}, (err, result) => {
Iif (_.isEmpty(result.id)) {
if (!util.notNull(output.query)) { output.query = {}; }
output.query.objectId = result.id;
executeGetById(context, output);
} else {
standardResponse(context, output)(err, result);
}
});
};
exports.executeInsert = (context, output) => executeInsert(context, output);
const executeUpdate = (context, output) => {
let tname = (output.input.mappedPaths || {}).objectName;
if (_.isEmpty(tname)) {
return context.fail({error: "No `objectName` value found."});
}
let objectId = (output.query || {}).objectId;
if (_.isEmpty(objectId)) {
return context.fail({error: `No ID found in query for ${tname}.`});
}
const pk = findPk(context, output, tname);
if (_.isEmpty(pk)) {
return context.fail({error: `No PK found in query for ${tname}.`});
}
const body = output.body || {};
const ks = Object.keys(body);
const kvstr = ks.map(k => `${k} = :${k}`).join(', ');
let script = `update ${tname} set ${kvstr} where ${pk} = :pkval00`;
let args = _.clone(body); args.pkval00 = objectId;
withConnection(context, output, (conn, cb) => {
conn.query(script, args, cb);
}, (err, result) => {
Iif (util.notNull(err)) { return context.fail({error: err}); }
Eif (util.notNull(result.count) && result.count > 0) {
executeGetById(context, output);
} else {
context.fail({error:
`Unable to update: no row in ${tname} where ${pk} = ${objectId}`});
}
});
};
exports.executeUpdate = (context, output) => executeUpdate(context, output);
const findNamedValues = (context, output) => {
let namedValues = {};
let script = (output.input.sql || output.resource.vendorPath || '');
script = fillInQuery(script, output);
((output.query || {}).namedParameters || '').split(/,/).forEach(np => {
namedValues[np.trim()] = null;
});
Object.keys(output.query || {}).forEach(qk => {
if (qk === 'namedParameters') { return; }
script = script.replace(new RegExp(`{${qk}}`, 'g'), `:${qk}`);
namedValues[qk] = output.query[qk];
});
return [script, namedValues];
};
exports.findNamedValues = (context, output) => findNamedValues(context, output);
// Replace curly parameters in the SQL query with their path parameters,
// handling the "orderBy" and "where" parameters specially.
const fillInQuery = (script, output) => {
const paths = output.paths || {};
return util.constructPath(script, v => {
if (v === 'orderBy' && !_.isEmpty(paths.orderBy)) {
return `order by ${paths.orderBy}`;
} else if (v === 'where' && !_.isEmpty(paths.where)) {
return `where ${paths.where}`;
} else {
return paths[v];
}
});
};
exports.fillInQuery = (script, output) => fillInQuery(script, output);
const findFields = (context, output, tname) => {
let fields = (output.query || {}).fields || '*';
if (fields === '*' &&
!/^true$/i.test(output.findConfig('db.selectall.fields') || 'false')) {
let table = _.find(JSON.parse(output.findConfig('db.schema')),
t => t.name === tname);
if (util.notNull(table)) {
fields = table.columns.filter(c => util.notNull(c.name) &&
c.dataType !== 'object').map(c => {
if (c.name.indexOf(' ') !== -1) { return `"${c.name}"`; }
else { return c.name; }
}).join(',');
}
}
return fields;
};
exports.findFields = (context, output, tname) => findFields(context, output, tname);
const findPk = (context, output, tname) => {
let pks = null;
let table = _.find(JSON.parse(output.findConfig('db.schema')),
t => t.name === tname);
if (util.notNull(table)) {
pks = table.columns.filter(c => util.notNull(c.name) &&
c.primaryKey).map(c => {
Iif (c.name.indexOf(' ') !== -1) { return `"${c.name}"`; }
else { return c.name; }
});
return pks[0];
}
return null;
};
exports.findPk = (context, output, tname) => findPk(context, output, tname);
const withConnection = (context, output, fn, cb) => {
createConnection(context, output, (err, conn) => {
Iif (util.notNull(err)) { return cb(err); }
fn(conn, (err, result) => {
Iif (util.notNull(err)) { conn.end(); return cb(err); }
conn.end(err => {
Iif (util.notNull(err)) { return cb(err); }
return cb(null, standardizeMySqlResult(context, output, result));
});
});
});
};
exports.withConnection = (context, output, fn, cb) => withConnection(context, output, fn, cb);
const standardizeMySqlResult = (context, output, result) => {
const inheads = (output.input.headers || {});
const driver = inheads['jdbc.driverClassName'] ||
output.findConfig('jdbc.driver.classname');
if (driver === 'org.postgresql.Driver') {
if (util.notNull(result.rows)) {
result = result.rows;
if (result.length > 0) {
const keys = _.keys(result[0]);
if (keys.length === 1) {
result.id = result[0][keys[0]];
}
}
} else {
result.count = result.rowCount;
}
}
if (isGetById(context, output) && result.length >= 1) result = result[0];
if (util.notNull(result.insertId)) result.id = result.insertId;
if (util.notNull(result.affectedRows)) result.count = result.affectedRows;
return result;
};
exports.standardizeMySqlResult = (context, output, result) => standardizeMySqlResult(context, output, result);
const createConnection = (context, output, cb) => {
const inheads = (output.input.headers || {});
const driver = inheads['jdbc.driverClassName'] ||
output.findConfig('jdbc.driver.classname');
if (driver === 'com.mysql.jdbc.Driver') {
cb(null, createMysqlConnection(context, output));
} else if (driver === 'org.postgresql.Driver') {
createPsqlConnection(context, output, cb);
} else {
cb(`Unrecognized driver: ${driver}`);
}
};
exports.createConnection = (context, output, cb) => createConnection(context, output, cb);
const createMysqlConnection = (context, output) => {
const inheads = (output.input.headers || {});
const hostport = inheads['jdbc.host'] || output.findConfig('db.host');
const colon = hostport.indexOf(':');
let host = hostport;
let port = 3306;
if (colon !== -1) {
host = hostport.substr(0, colon);
port = parseInt(hostport.substr(colon + 1));
if (isNaN(port)) { port = 3306; }
}
let conn = mysql.createConnection({
host: host,
port: port,
user: inheads['jdbc.username'] || output.findConfig('username'),
password: inheads['jdbc.password'] || output.findConfig('password'),
database: inheads['jdbc.database'] || output.findConfig('db.name')
});
// Here's how mysql can handle named parameters:
conn.config.queryFormat = (query, values) => {
if (!values) { return query; }
return query.replace(/\:(\w+)/g, function (txt, key) {
if (values.hasOwnProperty(key) && util.notNull(values[key])) {
return mysql.escape(values[key]);
}
return '';
}.bind(this));
};
return conn;
};
exports.createMysqlConnection = (context, output) => createMysqlConnection(context, output);
const createPsqlConnection = (context, output, cb) => {
// psql coincidently (or not so coincidently) has the same basic
// config structure as mysql
const inheads = (output.input.headers || {});
const hostport = inheads['jdbc.host'] || output.findConfig('db.host');
const colon = hostport.indexOf(':');
let host = hostport;
let port = 5432;
if (colon !== -1) {
host = hostport.substr(0, colon);
port = parseInt(hostport.substr(colon + 1));
Eif (isNaN(port)) { port = 5432; }
}
let client = new psql.Client({
host: host,
port: port,
user: inheads['jdbc.username'] || output.findConfig('username'),
password: inheads['jdbc.password'] || output.findConfig('password'),
database: inheads['jdbc.database'] || output.findConfig('db.name')
});
named.patch(client);
client.connect(err => cb(err, client));
};
exports.createPsqlConnection = (context, output, cb) => createPsqlConnection(context, output, cb);
const standardResponse = (context, output) => (err, result) => {
if (util.notNull(err)) { return context.fail({error: err}); }
else { context.succeed({headers: {}, body: result}); }
};
exports.standardResponse = (context, output) => standardResponse(context, output);
const pageOffset = (page, pageSize) => {
if (page < 1 || pageSize < 1) { return 0; }
return (page - 1) * pageSize;
};
exports.pageOffset = (page, pageSize) => pageOffset(page, pageSize);
|