chore: add Caddy config to ServiceSpec, load x-caddy to it

pkg/client/compose/caddy_test.go

@@ -12,7 +12,7 @@ func TestCaddyExtension(t *testing.T) {
 		name        string
 		composeYAML string
 		wantConfig  string
-		wantErr     bool
+		wantErr     string
 	}{
 		{
 			name: "x-caddy as string",
@@ -93,7 +93,7 @@ services:
         }
       unknown_field: "should cause error"
 `,
-			wantErr: true,
+			wantErr: "invalid keys: unknown_field",
 		},
 		{
 			name: "x-caddy with non-string config field should fail",
@@ -104,7 +104,22 @@ services:
     x-caddy:
       config: 123
 `,
-			wantErr: true,
+			wantErr: "expected type 'string'",
+		},
+		{
+			name: "x-caddy with x-ports conflict",
+			composeYAML: `
+services:
+  web:
+    image: nginx
+    x-caddy: |
+      example.com {
+        reverse_proxy web:80
+      }
+    x-ports:
+      - example.com:80/http
+`,
+			wantErr: "cannot specify both 'x-caddy' and 'x-ports'",
 		},
 	}
 
@@ -112,8 +127,8 @@ services:
 		t.Run(tt.name, func(t *testing.T) {
 			project, err := loadProjectFromContent(t, tt.composeYAML)
 
-			if tt.wantErr {
-				require.Error(t, err, "expected error for test case with invalid extension")
+			if tt.wantErr != "" {
+				require.ErrorContains(t, err, tt.wantErr)
 				return
 			}
 

pkg/client/compose/project.go

@@ -49,5 +49,10 @@ func LoadProject(ctx context.Context, paths []string, opts ...composecli.Project
 		return nil, err
 	}
 
+	// Validate extension combinations after all transformations.
+	if err = validateServicesExtensions(project); err != nil {
+		return nil, err
+	}
+
 	return project, nil
 }

pkg/client/compose/service.go

@@ -57,6 +57,12 @@ func ServiceSpecFromCompose(project *types.Project, serviceName string) (api.Ser
 		Mode: api.ServiceModeReplicated,
 	}
 
+	// Map x-caddy extension to spec.Caddy if specified.
+	if caddy, ok := service.Extensions[CaddyExtensionKey].(Caddy); ok && caddy.Config != "" {
+		spec.Caddy = &api.CaddySpec{
+			Config: caddy.Config,
+		}
+	}
 	if ports, ok := service.Extensions[PortsExtensionKey].([]api.PortSpec); ok {
 		spec.Ports = ports
 	}
@@ -242,3 +248,26 @@ func tmpfsVolumeSpecFromCompose(serviceVolume types.ServiceVolumeConfig) api.Vol
 
 	return spec
 }
+
+// validateServicesExtensions validates extension combinations across all services in the project.
+func validateServicesExtensions(project *types.Project) error {
+	for _, service := range project.Services {
+		// Check for x-caddy and x-ports conflict.
+		hasCaddy := false
+		if caddy, ok := service.Extensions[CaddyExtensionKey].(Caddy); ok && caddy.Config != "" {
+			hasCaddy = true
+		}
+
+		hasPorts := false
+		if ports, ok := service.Extensions[PortsExtensionKey].([]api.PortSpec); ok && len(ports) > 0 {
+			hasPorts = true
+		}
+
+		if hasCaddy && hasPorts {
+			return fmt.Errorf("service '%s' cannot specify both 'x-caddy' and 'x-ports': "+
+				"Caddy config is auto-generated from ports, use only one of them", service.Name)
+		}
+	}
+
+	return nil
+}

pkg/client/compose/service_test.go

@@ -2,6 +2,7 @@ package compose
 
 import (
 	"context"
+	"net/netip"
 	"path/filepath"
 	"slices"
 	"strings"
@@ -54,6 +55,11 @@ func loadProjectFromContent(t *testing.T, content string) (*types.Project, error
 		return nil, err
 	}
 
+	// Validate extension combinations after all transformations.
+	if err = validateServicesExtensions(project); err != nil {
+		return nil, err
+	}
+
 	return project, nil
 }
 
@@ -186,6 +192,25 @@ func TestServiceSpecFromCompose(t *testing.T) {
 							},
 						},
 					},
+					Ports: []api.PortSpec{
+						{
+							Hostname:      "test.example.com",
+							ContainerPort: 80,
+							Protocol:      api.ProtocolHTTPS,
+							Mode:          api.PortModeIngress,
+						},
+						{
+							ContainerPort: 8000,
+							Protocol:      api.ProtocolHTTP,
+							Mode:          api.PortModeIngress,
+						},
+						{
+							ContainerPort: 3000,
+							PublishedPort: 5000,
+							Protocol:      "tcp",
+							Mode:          api.PortModeHost,
+						},
+					},
 					Replicas: 3,
 					Volumes: []api.VolumeSpec{
 						{
@@ -229,6 +254,20 @@ func TestServiceSpecFromCompose(t *testing.T) {
 						},
 					},
 				},
+				"test-caddy-config": {
+					Name: "test-caddy-config",
+					Mode: api.ServiceModeReplicated,
+					Container: api.ContainerSpec{
+						Image:      "myapp:1.2.3",
+						PullPolicy: api.PullPolicyMissing,
+					},
+					Caddy: &api.CaddySpec{
+						Config: `test-caddy-config.example.com {
+  reverse_proxy {{ upstreams 80 }}
+}
+`,
+					},
+				},
 			},
 		},
 	}
@@ -249,13 +288,115 @@ func TestServiceSpecFromCompose(t *testing.T) {
 					return strings.Compare(a.Name, b.Name)
 				})
 
-				assert.True(t, cmp.Equal(spec, expectedSpec, cmpopts.EquateEmpty()),
-					cmp.Diff(spec, expectedSpec, cmpopts.EquateEmpty()))
+				cmpOpts := cmp.Options{cmpopts.EquateEmpty(), cmpopts.EquateComparable(netip.Addr{})}
+				assert.True(t, cmp.Equal(spec, expectedSpec, cmpOpts...), cmp.Diff(spec, expectedSpec, cmpOpts...))
 			}
 		})
 	}
 }
 
+func TestServiceSpecFromCompose_Caddy(t *testing.T) {
+	tests := []struct {
+		name        string
+		composeYAML string
+		want        *api.CaddySpec
+	}{
+		{
+			name: "x-caddy as string",
+			composeYAML: `
+services:
+  web:
+    image: nginx
+    x-caddy: |
+      example.com {
+        reverse_proxy web:80
+      }
+`,
+			want: &api.CaddySpec{
+				Config: `example.com {
+  reverse_proxy web:80
+}
+`,
+			},
+		},
+		{
+			name: "x-caddy as object with config field",
+			composeYAML: `
+services:
+  web:
+    image: nginx
+    x-caddy:
+      config: |
+        example.com {
+          reverse_proxy web:80
+        }
+`,
+			want: &api.CaddySpec{
+				Config: `example.com {
+  reverse_proxy web:80
+}
+`,
+			},
+		},
+		{
+			name: "x-caddy with path to Caddyfile",
+			composeYAML: `
+services:
+  web:
+    image: nginx
+    x-caddy: testdata/Caddyfile
+`,
+			want: &api.CaddySpec{
+				Config: `test.example.com {
+  reverse_proxy test:8000
+}
+`,
+			},
+		},
+		{
+			name: "x-caddy with empty string",
+			composeYAML: `
+services:
+  web:
+    image: nginx
+    x-caddy: ""
+`,
+			want: nil,
+		},
+		{
+			name: "no x-caddy extension",
+			composeYAML: `
+services:
+  web:
+    image: nginx
+`,
+			want: nil,
+		},
+		{
+			name: "x-caddy with empty object",
+			composeYAML: `
+services:
+  web:
+    image: nginx
+    x-caddy: {}
+`,
+			want: nil,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			project, err := loadProjectFromContent(t, tt.composeYAML)
+			require.NoError(t, err)
+
+			spec, err := ServiceSpecFromCompose(project, "web")
+			require.NoError(t, err)
+
+			assert.Equal(t, tt.want, spec.Caddy)
+		})
+	}
+}
+
 func TestServiceSpecFromCompose_XMachinesPlacement(t *testing.T) {
 	tests := []struct {
 		name        string

pkg/client/compose/testdata/compose-full-spec.yaml

@@ -31,6 +31,18 @@ services:
         target: /tmpfs
         tmpfs:
           size: 10485760
+    x-ports:
+      - test.example.com:80/https
+      - 8000/http
+      - 5000:3000@host
+
+  test-caddy-config:
+    image: myapp:1.2.3
+    # x-ports and x-caddy are mutually exclusive.
+    x-caddy: |
+      test-caddy-config.example.com {
+        reverse_proxy {{ upstreams 80 }}
+      }
 
 volumes:
   data1: