add docker-compose network priority

Author: nunokisc

lib/services.js

@@ -20,10 +20,6 @@ module.exports = async function (docker, projectName, recipe, output) {
     };
 
     if (service.networks !== undefined) {
-      //if netowrks > 1 (It doesnt seem possible to start a container by connecting to multiple networks at once.)
-      // To connect multiple networks "docker network connect" is used to connect additional networks.
-      // have to attach the network after container creation
-      // https://github.com/moby/moby/issues/29265 
       if (Array.isArray(service.networks)) {
         for (let index = 0; index < service.networks.length; index++) {
           let networkName = projectName + '_' + service.networks[index]
@@ -43,7 +39,7 @@ module.exports = async function (docker, projectName, recipe, output) {
       } else {
         let networkNames = Object.keys(service.networks);
         for (let index = 0; index < networkNames.length; index++) {
-          let network = service.networks[networkNames[index]];
+          let network = service.networks[networkNames[index]] || {};
           let networkName = projectName + '_' + networkNames[index]
           let networkTemplate = {
             'NetworkingConfig': {
@@ -66,11 +62,12 @@ module.exports = async function (docker, projectName, recipe, output) {
             networkTemplate.NetworkingConfig.EndpointsConfig[networkName].IPAMConfig['LinkLocalIPs'] = network.link_local_ips
           }
           if (network.priority !== undefined) {
-            //priority ??? - priority indicates in which order Compose implementation SHOULD connect the service’s containers to its networks. If unspecified, the default value is 0.
+            networkTemplate.NetworkingConfig.EndpointsConfig[networkName].priority = network.priority
+          } else {
+            networkTemplate.NetworkingConfig.EndpointsConfig[networkName].priority = 0
           }
           if (index === 0)
             opts.NetworkingConfig.EndpointsConfig = networkTemplate.NetworkingConfig.EndpointsConfig
-
           networksToAttach.push(networkTemplate.NetworkingConfig.EndpointsConfig)
         }
       }
@@ -96,16 +93,14 @@ module.exports = async function (docker, projectName, recipe, output) {
       opts.Name = serviceName;
     }
     try {
-      // maybe its a good idea create a task queue to perform container creations and related stuff by order/priority.
-      //console.log(util.inspect(networksToAttach, { showHidden: false, depth: null }))
-      //console.log(util.inspect(opts, { showHidden: false, depth: null }))
       var container = await docker.createContainer(opts);
 
       if (networksToAttach.length > 1) {
         let networkNames = Object.keys(networksToAttach[0]);
         let network = findNetwork(output, networkNames[0])
         await network.disconnect({ 'Container': container.id })
-        for (var networkToAttach of networksToAttach) {
+        let networksToAttachSorted = tools.sortNetworksToAttach(networksToAttach)
+        for (var networkToAttach of networksToAttachSorted) {
           let networkName = Object.keys(networkToAttach);
           let network = findNetwork(output, networkName)
           await network.connect({ 'Container': container.id, 'EndpointConfig': networkToAttach[networkName] })