KAFKA-14759: Move Mock, Schema, and Verifiable connectors to new test-plugins module

build.gradle

@@ -829,6 +829,7 @@ def connectPkgs = [
     'connect:file',
     'connect:json',
     'connect:runtime',
+    'connect:test-plugins',
     'connect:transforms',
     'connect:mirror',
     'connect:mirror-client'
@@ -2768,7 +2769,6 @@ project(':connect:runtime') {
     implementation libs.reflections
     implementation libs.mavenArtifact
     implementation libs.swaggerAnnotations
-    implementation project(':server-common')
 
     // We use this library to generate OpenAPI docs for the REST API, but we don't want or need it at compile
     // or run time. So, we add it to a separate configuration, which we use later on during docs generation
@@ -2778,6 +2778,8 @@ project(':connect:runtime') {
     testImplementation project(':core')
     testImplementation project(':metadata')
     testImplementation project(':core').sourceSets.test.output
+    testImplementation project(':server-common')
+    testImplementation project(':connect:test-plugins')
 
     testImplementation libs.easymock
     testImplementation libs.junitJupiterApi
@@ -3075,6 +3077,18 @@ project(':connect:mirror-client') {
   }
 }
 
+project(':connect:test-plugins') {
+  archivesBaseName = "connect-test-plugins"
+
+  dependencies {
+    api project(':connect:api')
+
+    implementation project(':server-common')
+    implementation libs.slf4jApi
+    implementation libs.jacksonDatabind
+  }
+}
+
 task aggregatedJavadoc(type: Javadoc, dependsOn: compileJava) {
   def projectsWithJavadoc = subprojects.findAll { it.javadoc.enabled }
   source = projectsWithJavadoc.collect { it.sourceSets.main.allJava }

connect/runtime/src/main/java/org/apache/kafka/connect/runtime/rest/resources/ConnectorPluginsResource.java

@@ -26,13 +26,6 @@
 import org.apache.kafka.connect.runtime.rest.entities.ConfigKeyInfo;
 import org.apache.kafka.connect.runtime.rest.entities.PluginInfo;
 import org.apache.kafka.connect.runtime.rest.errors.ConnectRestException;
-import org.apache.kafka.connect.sink.SinkConnector;
-import org.apache.kafka.connect.source.SourceConnector;
-import org.apache.kafka.connect.tools.MockSinkConnector;
-import org.apache.kafka.connect.tools.MockSourceConnector;
-import org.apache.kafka.connect.tools.SchemaSourceConnector;
-import org.apache.kafka.connect.tools.VerifiableSinkConnector;
-import org.apache.kafka.connect.tools.VerifiableSourceConnector;
 import org.apache.kafka.connect.util.FutureCallback;
 
 import javax.ws.rs.BadRequestException;
@@ -47,7 +40,6 @@
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
@@ -66,34 +58,22 @@ public class ConnectorPluginsResource implements ConnectResource {
     private final List<PluginInfo> connectorPlugins;
     private long requestTimeoutMs;
 
-    static final List<Class<? extends SinkConnector>> SINK_CONNECTOR_EXCLUDES = Arrays.asList(
-            VerifiableSinkConnector.class,
-            MockSinkConnector.class
-    );
-
-    static final List<Class<? extends SourceConnector>> SOURCE_CONNECTOR_EXCLUDES = Arrays.asList(
-            VerifiableSourceConnector.class,
-            MockSourceConnector.class,
-            SchemaSourceConnector.class
-    );
-
     public ConnectorPluginsResource(Herder herder) {
         this.herder = herder;
         this.connectorPlugins = new ArrayList<>();
         this.requestTimeoutMs = DEFAULT_REST_REQUEST_TIMEOUT_MS;
 
         // TODO: improve once plugins are allowed to be added/removed during runtime.
-        addConnectorPlugins(herder.plugins().sinkConnectors(), SINK_CONNECTOR_EXCLUDES);
-        addConnectorPlugins(herder.plugins().sourceConnectors(), SOURCE_CONNECTOR_EXCLUDES);
-        addConnectorPlugins(herder.plugins().transformations(), Collections.emptySet());
-        addConnectorPlugins(herder.plugins().predicates(), Collections.emptySet());
-        addConnectorPlugins(herder.plugins().converters(), Collections.emptySet());
-        addConnectorPlugins(herder.plugins().headerConverters(), Collections.emptySet());
+        addConnectorPlugins(herder.plugins().sinkConnectors());
+        addConnectorPlugins(herder.plugins().sourceConnectors());
+        addConnectorPlugins(herder.plugins().transformations());
+        addConnectorPlugins(herder.plugins().predicates());
+        addConnectorPlugins(herder.plugins().converters());
+        addConnectorPlugins(herder.plugins().headerConverters());
     }
 
-    private <T> void addConnectorPlugins(Collection<PluginDesc<T>> plugins, Collection<Class<? extends T>> excludes) {
+    private <T> void addConnectorPlugins(Collection<PluginDesc<T>> plugins) {
         plugins.stream()
-                .filter(p -> !excludes.contains(p.pluginClass()))
                 .map(PluginInfo::new)
                 .forEach(connectorPlugins::add);
     }

connect/runtime/src/test/java/org/apache/kafka/connect/runtime/rest/resources/ConnectorPluginsResourceTest.java

@@ -342,12 +342,8 @@ public void testValidateConfigWithNonExistentAlias() {
 
     @Test
     public void testListConnectorPlugins() {
-        Set<Class<?>> excludes = Stream.of(ConnectorPluginsResource.SINK_CONNECTOR_EXCLUDES, ConnectorPluginsResource.SOURCE_CONNECTOR_EXCLUDES)
-                .flatMap(Collection::stream)
-                .collect(Collectors.toSet());
         Set<PluginInfo> expectedConnectorPlugins = Stream.of(SINK_CONNECTOR_PLUGINS, SOURCE_CONNECTOR_PLUGINS)
                 .flatMap(Collection::stream)
-                .filter(p -> !excludes.contains(p.pluginClass()))
                 .map(PluginInfo::new)
                 .collect(Collectors.toSet());
         Set<PluginInfo> actualConnectorPlugins = new HashSet<>(connectorPluginsResource.listConnectorPlugins(true));
@@ -390,11 +386,6 @@ public void testConnectorPluginsIncludesClassTypeAndVersionInformation() throws
 
     @Test
     public void testListAllPlugins() {
-        Set<Class<?>> excludes = Stream.of(
-                        ConnectorPluginsResource.SINK_CONNECTOR_EXCLUDES,
-                        ConnectorPluginsResource.SOURCE_CONNECTOR_EXCLUDES
-                ).flatMap(Collection::stream)
-                .collect(Collectors.toSet());
         Set<PluginInfo> expectedConnectorPlugins = Stream.of(
                         SINK_CONNECTOR_PLUGINS,
                         SOURCE_CONNECTOR_PLUGINS,
@@ -403,7 +394,6 @@ public void testListAllPlugins() {
                         TRANSFORMATION_PLUGINS,
                         PREDICATE_PLUGINS
                 ).flatMap(Collection::stream)
-                .filter(p -> !excludes.contains(p.pluginClass()))
                 .map(PluginInfo::new)
                 .collect(Collectors.toSet());
         Set<PluginInfo> actualConnectorPlugins = new HashSet<>(connectorPluginsResource.listConnectorPlugins(false));

settings.gradle

@@ -55,6 +55,7 @@ include 'clients',
     'connect:mirror',
     'connect:mirror-client',
     'connect:runtime',
+    'connect:test-plugins',
     'connect:transforms',
     'core',
     'examples',

tests/kafkatest/services/connect.py

@@ -285,26 +285,31 @@ def append_to_environment_variable(self, envvar, value):
             env_opts = "\"%s %s\"" % (env_opts.strip('\"'), value)
         self.environment[envvar] = env_opts
 
-    def append_filestream_connectors_to_classpath(self):
+    def maybe_append_filestream_connectors_to_classpath(self):
         if self.include_filestream_connectors:
-            cwd = os.getcwd()
-            self.logger.info("Including filestream connectors when starting Connect. "
-                             "Looking for jar locally in: %s" % cwd)
-            relative_path = "/connect/file/build/libs/"
-            local_dir = cwd + relative_path
-            lib_dir = self.path.home() + relative_path
-            for pwd, dirs, files in os.walk(local_dir):
-                for file in files:
-                    if file.startswith("connect-file") and file.endswith(".jar"):
-                        # Use the expected directory on the node instead of the path in the driver node
-                        file_path = lib_dir + file
-                        self.logger.debug("Appending %s to Connect worker's CLASSPATH" % file_path)
-                        return "export CLASSPATH=${CLASSPATH}:%s; " % file_path
-            self.logger.info("Jar with filestream connectors was not found under %s" % lib_dir)
+            return self.append_module_to_classpath("file")
         else:
             self.logger.info("Starting Connect without filestream connectors in the CLASSPATH")
+        return ""
 
-        return None
+    def append_test_plugins_to_classpath(self):
+        return self.append_module_to_classpath("test-plugins")
+
+    def append_module_to_classpath(self, module):
+        cwd = os.getcwd()
+        relative_path = "/connect/" + module + "/build/libs/"
+        local_dir = cwd + relative_path
+        lib_dir = self.path.home() + relative_path
+        for pwd, dirs, files in os.walk(local_dir):
+            for file in files:
+                if file.endswith(".jar"):
+                    # Use the expected directory on the node instead of the path in the driver node
+                    file_path = lib_dir + file
+                    self.logger.info("Appending %s to Connect worker's CLASSPATH" % file_path)
+                    return "export CLASSPATH=${CLASSPATH}:%s; " % file_path
+
+        self.logger.info("Jar not found within %s" % local_dir)
+        return ""
 
 
 class ConnectStandaloneService(ConnectServiceBase):
@@ -327,8 +332,8 @@ def start_cmd(self, node, connector_configs):
 
         cmd += fix_opts_for_new_jvm(node)
         cmd += "export KAFKA_OPTS=\"%s %s\"; " % (heap_kafka_opts, other_kafka_opts)
-        classpath = self.append_filestream_connectors_to_classpath()
-        cmd += classpath if classpath else ""
+        cmd += self.append_test_plugins_to_classpath()
+        cmd += self.maybe_append_filestream_connectors_to_classpath()
 
         for envvar in self.environment:
             cmd += "export %s=%s; " % (envvar, str(self.environment[envvar]))
@@ -388,8 +393,8 @@ def start_cmd(self, node, connector_configs):
         for envvar in self.environment:
             cmd += "export %s=%s; " % (envvar, str(self.environment[envvar]))
 
-        classpath = self.append_filestream_connectors_to_classpath()
-        cmd += classpath if classpath else ""
+        cmd += self.maybe_append_filestream_connectors_to_classpath()
+        cmd += self.append_test_plugins_to_classpath()
         cmd += "%s %s " % (self.path.script("connect-distributed.sh", node), self.CONFIG_FILE)
         cmd += " & echo $! >&3 ) 1>> %s 2>> %s 3> %s" % (self.STDOUT_FILE, self.STDERR_FILE, self.PID_FILE)
         return cmd