Adds the env prop for every run server (#158)

without this change you can't reference the port of a server as an env var

fixes #147

spring-cloud-contract-stub-runner/README.adoc

@@ -159,6 +159,15 @@ Below you can find an example of achieving the same result by setting values on
 include::src/test/groovy/org/springframework/cloud/contract/stubrunner/spring/cloud/StubRunnerSpringCloudAutoConfigurationSpec.groovy[tags=autoconfigure]
 ----
 
+Stub Runner Spring registers environment variables in the following manner
+for every registered WireMock server. Example for Stub Runner ids
+ `com.example:foo`, `com.example:bar`.
+
+- `stubrunner.runningstubs.foo.port`
+- `stubrunner.runningstubs.bar.port`
+
+Which you can reference in your code.
+
 
 === Stub Runner Spring Cloud
 

spring-cloud-contract-stub-runner/src/main/java/org/springframework/cloud/contract/stubrunner/spring/StubRunnerConfiguration.java

@@ -17,6 +17,8 @@
 package org.springframework.cloud.contract.stubrunner.spring;
 
 import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
@@ -24,6 +26,8 @@ import org.springframework.boot.context.properties.EnableConfigurationProperties
 import org.springframework.cloud.contract.stubrunner.AetherStubDownloader;
 import org.springframework.cloud.contract.stubrunner.BatchStubRunner;
 import org.springframework.cloud.contract.stubrunner.BatchStubRunnerFactory;
+import org.springframework.cloud.contract.stubrunner.RunningStubs;
+import org.springframework.cloud.contract.stubrunner.StubConfiguration;
 import org.springframework.cloud.contract.stubrunner.StubDownloader;
 import org.springframework.cloud.contract.stubrunner.StubRunnerOptions;
 import org.springframework.cloud.contract.stubrunner.StubRunnerOptionsBuilder;
@@ -31,6 +35,9 @@ import org.springframework.cloud.contract.verifier.messaging.MessageVerifier;
 import org.springframework.cloud.contract.verifier.messaging.noop.NoOpStubMessages;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.MapPropertySource;
+import org.springframework.core.env.MutablePropertySources;
 import org.springframework.core.io.Resource;
 
 /**
@@ -42,12 +49,16 @@ import org.springframework.core.io.Resource;
 @ConditionalOnMissingBean(type = "org.springframework.cloud.contract.wiremock.WiremockServerConfiguration")
 public class StubRunnerConfiguration {
 
+	private static final String STUBRUNNER_PREFIX = "stubrunner.runningstubs";
+
 	@Autowired(required = false)
 	private MessageVerifier<?> contractVerifierMessaging;
 	@Autowired(required = false)
 	private StubDownloader stubDownloader;
 	@Autowired
 	private StubRunnerProperties props;
+	@Autowired
+	private ConfigurableEnvironment environment;
 
 	/**
 	 * Bean that initializes stub runners, runs them and on shutdown closes them. Upon its
@@ -70,7 +81,8 @@ public class StubRunnerConfiguration {
 				this.contractVerifierMessaging != null ? this.contractVerifierMessaging
 						: new NoOpStubMessages()).buildBatchStubRunner();
 		// TODO: Consider running it in a separate thread
-		batchStubRunner.runStubs();
+		RunningStubs runningStubs = batchStubRunner.runStubs();
+		registerPort(runningStubs);
 		return batchStubRunner;
 	}
 
@@ -78,4 +90,17 @@ public class StubRunnerConfiguration {
 		return stubRepositoryRoot != null ? stubRepositoryRoot.getURI().toString() : "";
 	}
 
+	private void registerPort(RunningStubs runStubs) {
+		MutablePropertySources propertySources = this.environment.getPropertySources();
+		if (!propertySources.contains(STUBRUNNER_PREFIX)) {
+			propertySources.addFirst(
+					new MapPropertySource(STUBRUNNER_PREFIX, new HashMap<String, Object>()));
+		}
+		Map<String, Object> source = ((MapPropertySource) propertySources
+				.get(STUBRUNNER_PREFIX)).getSource();
+		for (Map.Entry<StubConfiguration, Integer> entry : runStubs.validNamesAndPorts().entrySet()) {
+			source.put(STUBRUNNER_PREFIX + "." + entry.getKey().getArtifactId() + ".port", entry.getValue());
+		}
+	}
+
 }

spring-cloud-contract-stub-runner/src/test/groovy/org/springframework/cloud/contract/stubrunner/spring/StubRunnerConfigurationSpec.groovy

@@ -25,6 +25,7 @@ import org.springframework.boot.test.context.SpringBootContextLoader
 import org.springframework.cloud.contract.stubrunner.StubFinder
 import org.springframework.cloud.contract.stubrunner.StubNotFoundException
 import org.springframework.context.annotation.Configuration
+import org.springframework.core.env.Environment
 import org.springframework.test.annotation.DirtiesContext
 import org.springframework.test.context.ActiveProfiles
 import org.springframework.test.context.ContextConfiguration
@@ -45,6 +46,7 @@ import spock.lang.Specification
 class StubRunnerConfigurationSpec extends Specification {
 
 	@Autowired StubFinder stubFinder
+	@Autowired Environment environment
 
 	@BeforeClass
 	@AfterClass
@@ -81,6 +83,15 @@ class StubRunnerConfigurationSpec extends Specification {
 			thrown(StubNotFoundException)
 	}
 
+	def 'should register started servers as environment variables'() {
+		expect:
+			environment.getProperty("stubrunner.runningstubs.loanIssuance.port") != null
+			stubFinder.findAllRunningStubs().getPort("loanIssuance") == (environment.getProperty("stubrunner.runningstubs.loanIssuance.port") as Integer)
+		and:
+			environment.getProperty("stubrunner.runningstubs.fraudDetectionServer.port") != null
+			stubFinder.findAllRunningStubs().getPort("fraudDetectionServer") == (environment.getProperty("stubrunner.runningstubs.fraudDetectionServer.port") as Integer)
+	}
+
 	@Configuration
 	@EnableAutoConfiguration
 	static class Config {}