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index.js
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index.js
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'use strict';
var os = require('os'),
spawn = require('child_process').spawn,
fs = require('fs'),
https = require('https'),
tar = require('tar'),
zlib = require('zlib'),
path = require('path'),
mkdirp = require('mkdirp'),
Q = require('q');
var JARNAME = 'DynamoDBLocal.jar';
var Config = {
installPath: path.join(os.tmpdir(), 'dynamodb-local'),
downloadUrl: 'https://s3-us-west-2.amazonaws.com/dynamodb-local/dynamodb_local_latest.tar.gz'
};
var runningProcesses = {},
DynamoDbLocal = {
/**
*
* @param port
* @param dbPath if omitted will use in memory
* @param additionalArgs
* @param verbose
* @returns {Promise.<ChildProcess>}
*/
launch: function (port, dbPath, additionalArgs, verbose) {
if (runningProcesses[port]) {
return Q.fcall(function () {
return runningProcesses[port];
});
}
if (!additionalArgs) {
additionalArgs = [];
}
else if (!Array.isArray(additionalArgs)) {
additionalArgs = [additionalArgs];
}
if (!dbPath) {
additionalArgs.push('-inMemory');
}
else {
additionalArgs.push('-dbPath', dbPath);
}
if (verbose != null) {
verbose = true;
}
return installDynamoDbLocal()
.then(function () {
var args = [
'-Djava.library.path=./DynamoDBLocal_lib',
'-jar',
JARNAME,
'-port',
port
];
args = args.concat(additionalArgs);
var child = spawn('java', args, {
cwd: Config.installPath,
env: process.env,
stdio: ['pipe', 'pipe', process.stderr]
});
if (!child.pid) throw new Error('Unable to launch DynamoDBLocal process');
child
.on('error', function (err) {
if (verbose) console.log('local DynamoDB start error', err);
throw new Error('Local DynamoDB failed to start. ');
})
.on('close', function (code) {
if (code !== null && code !== 0) {
if (verbose) console.log('Local DynamoDB failed to start with code', code);
}
});
runningProcesses[port] = child;
if (verbose) {
console.log('DynamoDbLocal(', child.pid, ') started on port', port,
'via java', args.join(' '), 'from CWD', Config.installPath);
}
return child;
});
},
stop: function (port) {
if (runningProcesses[port]) {
runningProcesses[port].kill('SIGKILL');
delete runningProcesses[port];
}
},
relaunch: function (port, db) {
this.stop(port);
this.launch(port, db);
},
configureInstaller: function (conf) {
if (conf.installPath) {
Config.installPath = conf.installPath;
}
if (conf.downloadUrl) {
Config.downloadUrl = conf.downloadUrl;
}
}
};
module.exports = DynamoDbLocal;
function installDynamoDbLocal() {
console.log('Checking for DynamoDB-Local in ', Config.installPath);
var deferred = Q.defer();
try {
if (fs.existsSync(path.join(Config.installPath, JARNAME))) {
return Q.fcall(function () {
return true;
});
}
} catch (e) {
}
console.log('DynamoDb Local not installed. Installing...');
if (!fs.existsSync(Config.installPath))
fs.mkdirSync(Config.installPath);
https.get(Config.downloadUrl,
function (redirectResponse) {
if (200 != redirectResponse.statusCode) {
deferred.reject(new Error('Error getting DynamoDb local latest tar.gz location ' +
response.headers['location'] + ': ' + redirectResponse.statusCode));
}
redirectResponse
.pipe(zlib.Unzip())
.pipe(tar.Extract({path: Config.installPath}))
.on('end', function () {
deferred.resolve();
})
.on('error', function (err) {
deferred.reject(err);
});
})
.on('error', function (e) {
deferred.reject(e);
});
return deferred.promise;
}