Allow configuring the network name for project-based containers

changelog/@unreleased/pr-561.v2.yml

@@ -0,0 +1,6 @@
+type: feature
+feature:
+  description: Projects using DockerProxyExtension for project-based containers can
+    now override the docker network name used by the proxy
+  links:
+  - https://github.com/palantir/docker-proxy-rule/pull/561

docker-proxy-junit-jupiter/src/main/java/com/palantir/docker/proxy/DockerProxyExtension.java

@@ -66,7 +66,24 @@ public static DockerProxyExtension fromProjectName(ProjectName projectName, Clas
     public static DockerProxyExtension fromProjectName(
             ProjectName projectName, Class<?> classToLogFor, String imageNameOverride) {
         return new DockerProxyExtension(
-                docker -> new ProjectBasedDockerContainerInfo(docker, projectName, Optional.of(imageNameOverride)),
+                docker -> new ProjectBasedDockerContainerInfo(
+                        docker, projectName, Optional.of(imageNameOverride), Optional.empty()),
+                classToLogFor);
+    }
+
+    /**
+     * Creates a {@link DockerProxyExtension} using a {@link ProjectBasedDockerContainerInfo}.
+     *
+     * @param projectName The docker-compose-rule ProjectName to use to find the containers
+     * @param networkNameOverride The docker network name to use instead of the default
+     * @param imageNameOverride The docker image name to use instead of the default
+     * @param classToLogFor The class using {@link DockerProxyExtension}
+     */
+    public static DockerProxyExtension fromProjectName(
+            ProjectName projectName, Class<?> classToLogFor, String imageNameOverride, String networkNameOverride) {
+        return new DockerProxyExtension(
+                docker -> new ProjectBasedDockerContainerInfo(
+                        docker, projectName, Optional.of(imageNameOverride), Optional.of(networkNameOverride)),
                 classToLogFor);
     }
 

docker-proxy-rule-core/src/main/java/com/palantir/docker/proxy/ProjectBasedDockerContainerInfo.java

@@ -25,16 +25,21 @@ public final class ProjectBasedDockerContainerInfo implements DockerContainerInf
     private final DockerExecutable docker;
     private final ProjectName projectName;
     private final Optional<String> imageNameOverride;
+    private final Optional<String> networkNameOverride;
 
     public ProjectBasedDockerContainerInfo(
-            DockerExecutable docker, ProjectName projectName, Optional<String> imageNameOverride) {
+            DockerExecutable docker,
+            ProjectName projectName,
+            Optional<String> imageNameOverride,
+            Optional<String> networkNameOverride) {
         this.docker = docker;
         this.projectName = projectName;
         this.imageNameOverride = imageNameOverride;
+        this.networkNameOverride = networkNameOverride;
     }
 
     public ProjectBasedDockerContainerInfo(DockerExecutable docker, ProjectName projectName) {
-        this(docker, projectName, Optional.empty());
+        this(docker, projectName, Optional.empty(), Optional.empty());
     }
 
     @Override
@@ -62,7 +67,7 @@ public Optional<String> getHostForIp(String ip) {
 
     @Override
     public String getNetworkName() {
-        return projectName.asString() + "_default";
+        return networkNameOverride.orElseGet(() -> projectName.asString() + "_default");
     }
 
     @Override