Ignore URI when local.mongo.port is set

This commit makes sure that if `local.mongo.port` is set, a `MongoClient`
on the embedded MongoDB instance is created. When an embedded instance
is detected, only the `host` property is used and the `uri` is ignored if
set.

This makes sure that the auto-configured `MongoClient` automatically
switches to the embedded server, even if a production uri has been
specified.

Closes gh-8219

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mongo/MongoProperties.java

@@ -202,59 +202,69 @@ public class MongoProperties {
 	public MongoClient createMongoClient(MongoClientOptions options,
 			Environment environment) throws UnknownHostException {
 		try {
-			if (hasCustomAddress() || hasCustomCredentials()) {
-				if (this.uri != null) {
-					throw new IllegalStateException("Invalid mongo configuration, "
-							+ "either uri or host/port/credentials must be specified");
-				}
-				if (options == null) {
-					options = MongoClientOptions.builder().build();
-				}
-				List<MongoCredential> credentials = new ArrayList<MongoCredential>();
-				if (hasCustomCredentials()) {
-					String database = this.authenticationDatabase == null
-							? getMongoClientDatabase() : this.authenticationDatabase;
-					credentials.add(MongoCredential.createCredential(this.username,
-							database, this.password));
-				}
-				String host = this.host == null ? "localhost" : this.host;
-				int port = determinePort(environment);
-				return new MongoClient(
-						Collections.singletonList(new ServerAddress(host, port)),
-						credentials, options);
+			Integer embeddedPort = getEmbeddedPort(environment);
+			if (embeddedPort != null) {
+				return createEmbeddedMongoClient(options, embeddedPort);
 			}
-			// The options and credentials are in the URI
-			return new MongoClient(new MongoClientURI(determineUri(), builder(options)));
+			return createNetworkMongoClient(options);
 		}
 		finally {
 			clearPassword();
 		}
 	}
 
-	private boolean hasCustomAddress() {
-		return this.host != null || this.port != null;
+	private Integer getEmbeddedPort(Environment environment) {
+		if (environment != null) {
+			String localPort = environment.getProperty("local.mongo.port");
+			if (localPort != null) {
+				return Integer.valueOf(localPort);
+			}
+		}
+		return null;
 	}
 
-	private boolean hasCustomCredentials() {
-		return this.username != null && this.password != null;
+	private MongoClient createEmbeddedMongoClient(MongoClientOptions options, int port) {
+		if (options == null) {
+			options = MongoClientOptions.builder().build();
+		}
+		String host = this.host == null ? "localhost" : this.host;
+		return new MongoClient(
+				Collections.singletonList(new ServerAddress(host, port)),
+				Collections.<MongoCredential>emptyList(), options);
 	}
 
-	private int determinePort(Environment environment) {
-		if (this.port == null) {
-			return DEFAULT_PORT;
-		}
-		if (this.port == 0) {
-			if (environment != null) {
-				String localPort = environment.getProperty("local.mongo.port");
-				if (localPort != null) {
-					return Integer.valueOf(localPort);
-				}
+	private MongoClient createNetworkMongoClient(MongoClientOptions options) {
+		if (hasCustomAddress() || hasCustomCredentials()) {
+			if (this.uri != null) {
+				throw new IllegalStateException("Invalid mongo configuration, "
+						+ "either uri or host/port/credentials must be specified");
+			}
+			if (options == null) {
+				options = MongoClientOptions.builder().build();
+			}
+			List<MongoCredential> credentials = new ArrayList<MongoCredential>();
+			if (hasCustomCredentials()) {
+				String database = this.authenticationDatabase == null
+						? getMongoClientDatabase() : this.authenticationDatabase;
+				credentials.add(MongoCredential.createCredential(this.username,
+						database, this.password));
 			}
-			throw new IllegalStateException(
-					"spring.data.mongodb.port=0 and no local mongo port configuration "
-							+ "is available");
+			String host = this.host == null ? "localhost" : this.host;
+			int port = this.port != null ? this.port : DEFAULT_PORT;
+			return new MongoClient(
+					Collections.singletonList(new ServerAddress(host, port)),
+					credentials, options);
 		}
-		return this.port;
+		// The options and credentials are in the URI
+		return new MongoClient(new MongoClientURI(determineUri(), builder(options)));
+	}
+
+	private boolean hasCustomAddress() {
+		return this.host != null || this.port != null;
+	}
+
+	private boolean hasCustomCredentials() {
+		return this.username != null && this.password != null;
 	}
 
 	private Builder builder(MongoClientOptions options) {

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mongo/embedded/EmbeddedMongoAutoConfiguration.java

@@ -158,7 +158,6 @@ public class EmbeddedMongoAutoConfiguration {
 	}
 
 	private void setEmbeddedPort(int port) {
-		this.properties.setPort(port);
 		setPortProperty(this.context, port);
 	}
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoPropertiesTests.java

@@ -33,6 +33,7 @@ import org.springframework.boot.context.properties.EnableConfigurationProperties
 import org.springframework.boot.test.util.EnvironmentTestUtils;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.mock.env.MockEnvironment;
 import org.springframework.test.util.ReflectionTestUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -49,6 +50,8 @@ public class MongoPropertiesTests {
 	@Rule
 	public ExpectedException thrown = ExpectedException.none();
 
+	private MockEnvironment environment = new MockEnvironment();
+
 	@Test
 	public void canBindCharArrayPassword() {
 		// gh-1572
@@ -151,6 +154,17 @@ public class MongoPropertiesTests {
 		properties.createMongoClient(null, null);
 	}
 
+	@Test
+	public void uriIsIgnoredInEmbeddedMode() throws UnknownHostException {
+		MongoProperties properties = new MongoProperties();
+		properties.setUri("mongodb://mongo.example.com:1234/mydb");
+		this.environment.setProperty("local.mongo.port", "4000");
+		MongoClient client = properties.createMongoClient(null, this.environment);
+		List<ServerAddress> allAddresses = extractServerAddresses(client);
+		assertThat(allAddresses).hasSize(1);
+		assertServerAddress(allAddresses.get(0), "localhost", 4000);
+	}
+
 	@Test
 	public void allMongoClientOptionsCanBeSet() throws UnknownHostException {
 		MongoClientOptions.Builder builder = MongoClientOptions.builder();