Added configuration to set a max-concurrency cap

config.js

@@ -45,6 +45,7 @@ Options:
 	--s3_access_key <key>	S3 access key, required if --s3_endpoint is set. (default: none)
 	--s3_secret_key <secret>	S3 secret key, required if --s3_endpoint is set. (default: none) 
 	--s3_signature_version <version>	S3 signature version. (default: 4)
+	--max_concurrency   <number>	Place a cap on the max-concurrency option to use for each task. (default: no limit)
 Log Levels: 
 error | debug | info | verbose | debug | silly 
 `);
@@ -100,4 +101,6 @@ config.s3Bucket = argv.s3_bucket || fromConfigFile("s3Bucket", "");
 config.s3AccessKey = argv.s3_access_key || fromConfigFile("s3AccessKey", process.env.AWS_ACCESS_KEY_ID || "")
 config.s3SecretKey = argv.s3_secret_key || fromConfigFile("s3SecretKey", process.env.AWS_SECRET_ACCESS_KEY || "")
 config.s3SignatureVersion = argv.s3_signature_version || fromConfigFile("s3SignatureVersion", "4")
+config.maxConcurrency = parseInt(argv.max_concurrency || fromConfigFile("maxConcurrency", 0));
+
 module.exports = config;

libs/odmInfo.js

@@ -16,10 +16,11 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 "use strict";
-let odmRunner = require('./odmRunner');
+const odmRunner = require('./odmRunner');
-let async = require('async');
+const config = require('../config');
-let assert = require('assert');
+const async = require('async');
-let logger = require('./logger');
+const assert = require('assert');
+const logger = require('./logger');
 
 let odmOptions = null;
 let odmVersion = null;
@@ -245,7 +246,12 @@ module.exports = {
 			};
 
 			// Scan through all possible options
+			let maxConcurrencyFound = false;
+			let maxConcurrencyIsAnOption = false;
+
 			for (let odmOption of odmOptions){
+				if (odmOption.name === 'max-concurrency') maxConcurrencyIsAnOption = true;
+				
 				// Was this option selected by the user?
 				/*jshint loopfunc: true */
 				let opt = options.find(o => o.name === odmOption.name);
@@ -259,6 +265,16 @@ module.exports = {
 							checkDomain(odmOption.domain, value);
 						}
 						
+						// Max concurrency check
+						if (maxConcurrencyIsAnOption){
+							maxConcurrencyFound = true;
+
+							// Cap
+							if (config.maxConcurrency){
+								value = Math.min(value, config.maxConcurrency);
+							}
+						}
+
 						result.push({
 							name: odmOption.name,
 							value: value
@@ -269,6 +285,15 @@ module.exports = {
 				}
 			}
 
+			// If no max concurrency was passed by the user
+			// but our configuration sets a limit, pass it.
+			if (!maxConcurrencyFound && maxConcurrencyIsAnOption && config.maxConcurrency){
+				result.push({
+					name: "max-concurrency",
+					value: config.maxConcurrency
+				});
+			}
+
 			if (errors.length > 0) done(new Error(JSON.stringify(errors)));
 			else done(null, result);
 		}catch(e){