use highest priority network to declare network aliasses

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>

go.mod

@@ -17,7 +17,7 @@ require (
 	github.com/awslabs/goformation/v4 v4.15.6
 	github.com/buger/goterm v1.0.0
 	github.com/cnabio/cnab-to-oci v0.3.1-beta1
-	github.com/compose-spec/compose-go v0.0.0-20210427143821-6d1c5982084f
+	github.com/compose-spec/compose-go v0.0.0-20210503135708-e8ee37c1478c
 	github.com/containerd/console v1.0.1
 	github.com/containerd/containerd v1.4.3
 	github.com/containerd/continuity v0.0.0-20200928162600-f2cc35102c2a // indirect

go.sum

@@ -308,8 +308,8 @@ github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGX
 github.com/cockroachdb/datadriven v0.0.0-20190809214429-80d97fb3cbaa/go.mod h1:zn76sxSg3SzpJ0PPJaLDCu+Bu0Lg3sKTORVIj19EIF8=
 github.com/codahale/hdrhistogram v0.0.0-20160425231609-f8ad88b59a58/go.mod h1:sE/e/2PUdi/liOCUjSTXgM1o87ZssimdTWN964YiIeI=
 github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd/go.mod h1:sE/e/2PUdi/liOCUjSTXgM1o87ZssimdTWN964YiIeI=
-github.com/compose-spec/compose-go v0.0.0-20210427143821-6d1c5982084f h1:EJu2tLPcjRTAdFDJZOQj57ehBo+m71Iz6sUf1Q8/BOY=
+github.com/compose-spec/compose-go v0.0.0-20210503135708-e8ee37c1478c h1:XDrhClIbE/zCDU4KWCYSYmceYZj5EBn3DMhQ7hVvyUs=
-github.com/compose-spec/compose-go v0.0.0-20210427143821-6d1c5982084f/go.mod h1:6eIT9U2OgdHmkRD6szmqatCrWWEEUSwl/j2iJYH4jLo=
+github.com/compose-spec/compose-go v0.0.0-20210503135708-e8ee37c1478c/go.mod h1:6eIT9U2OgdHmkRD6szmqatCrWWEEUSwl/j2iJYH4jLo=
 github.com/containerd/cgroups v0.0.0-20190919134610-bf292b21730f/go.mod h1:OApqhQ4XNSNC13gXIwDjhOQxjWa/NxkwZXJ1EvqT0ko=
 github.com/containerd/cgroups v0.0.0-20200531161412-0dbf7f05ba59/go.mod h1:pA0z1pT8KYB3TCXK/ocprsh7MAkoW8bZVzPdih9snmM=
 github.com/containerd/cgroups v0.0.0-20200710171044-318312a37340 h1:9atoWyI9RtXFwf7UDbme/6M8Ud0rFrx+Q3ZWgSnsxtw=

local/compose/convergence.go

@@ -318,8 +318,9 @@ func (s *composeService) createMobyContainer(ctx context.Context, project *types
 		Labels: containerConfig.Labels,
 	}
 	cState.Add(createdContainer)
-	for netName, cfg := range service.Networks {
+	for _, netName := range service.NetworksByPriority() {
 		netwrk := project.Networks[netName]
+		cfg := service.Networks[netName]
 		aliases := []string{getContainerName(project.Name, service, number)}
 		if useNetworkAliases {
 			aliases = append(aliases, service.Name)

local/compose/create.go

@@ -276,6 +276,22 @@ func (s *composeService) getCreateOptions(ctx context.Context, p *types.Project,
 	if networkMode == "" {
 		networkMode = getDefaultNetworkMode(p, service)
 	}
+
+	var networkConfig *network.NetworkingConfig
+	// TODO use network with highest priority, attribute is missing from compose-go
+	for _, id := range service.NetworksByPriority() {
+		net := p.Networks[id]
+		config := service.Networks[id]
+		networkConfig = &network.NetworkingConfig{
+			EndpointsConfig: map[string]*network.EndpointSettings{
+				net.Name: {
+					Aliases: getAliases(service, config),
+				},
+			},
+		}
+		break
+	}
+
 	ipcmode, err := getMode(ctx, service.Name, service.Ipc)
 	if err != nil {
 		return nil, nil, nil, err
@@ -328,7 +344,6 @@ func (s *composeService) getCreateOptions(ctx context.Context, p *types.Project,
 		LogConfig:      logConfig,
 	}
 
-	networkConfig := buildDefaultNetworkConfig(service, container.NetworkMode(networkMode), getContainerName(p.Name, service, number))
 	return &containerConfig, &hostConfig, networkConfig, nil
 }
 
@@ -843,21 +858,6 @@ func buildTmpfsOptions(tmpfs *types.ServiceVolumeTmpfs) *mount.TmpfsOptions {
 	}
 }
 
-func buildDefaultNetworkConfig(s types.ServiceConfig, networkMode container.NetworkMode, containerName string) *network.NetworkingConfig {
-	if len(s.Networks) == 0 {
-		return nil
-	}
-	config := map[string]*network.EndpointSettings{}
-	net := string(networkMode)
-	config[net] = &network.EndpointSettings{
-		Aliases: append(getAliases(s, s.Networks[net]), containerName),
-	}
-
-	return &network.NetworkingConfig{
-		EndpointsConfig: config,
-	}
-}
-
 func getAliases(s types.ServiceConfig, c *types.ServiceNetworkConfig) []string {
 	aliases := []string{s.Name}
 	if c != nil {

local/e2e/compose/fixtures/network-alias/compose.yaml

@@ -0,0 +1,15 @@
+services:
+
+  container1:
+    image: nginx
+
+  container2:
+    image: nginx
+    networks:
+      foo:
+        aliases:
+          - alias-of-container2
+
+networks:
+  foo:
+    name: bar

local/e2e/compose/networks_test.go

@@ -70,3 +70,22 @@ func TestNetworks(t *testing.T) {
 		assert.Assert(t, !strings.Contains(res.Combined(), "microservices"), res.Combined())
 	})
 }
+
+func TestNetworkAliasses(t *testing.T) {
+	c := NewParallelE2eCLI(t, binDir)
+
+	const projectName = "network_alias_e2e"
+
+	t.Run("up", func(t *testing.T) {
+		c.RunDockerCmd("compose", "-f", "./fixtures/network-alias/compose.yaml", "--project-name", projectName, "up", "-d")
+	})
+
+	t.Run("curl", func(t *testing.T) {
+		res := c.RunDockerCmd("compose", "-f", "./fixtures/network-alias/compose.yaml", "--project-name", projectName, "exec", "-T", "container1", "curl", "http://alias-of-container2/")
+		assert.Assert(t, !strings.Contains(res.Stdout(), "Welcome to nginx!"), res.Stdout())
+	})
+
+	t.Run("down", func(t *testing.T) {
+		_ = c.RunDockerCmd("compose", "--project-name", projectName, "down")
+	})
+}