private void processJson(ConfigurableEnvironment environment, String json) {
try {
JsonParser parser = JsonParserFactory.getJsonParser();
Map<String, Object> map = parser.parseMap(json);
if (!map.isEmpty()) {
addJsonPropertySource(
environment, new MapPropertySource("spring.application.json", flatten(map)));
}
} catch (Exception ex) {
logger.warn("Cannot parse JSON for spring.application.json: " + json, ex);
}
}
/**
* An {@link EnvironmentPostProcessor} that knows where to find VCAP (a.k.a. Cloud Foundry) meta
* data in the existing environment. It parses out the VCAP_APPLICATION and VCAP_SERVICES meta data
* and dumps it in a form that is easily consumed by {@link Environment} users. If the app is
* running in Cloud Foundry then both meta data items are JSON objects encoded in OS environment
* variables. VCAP_APPLICATION is a shallow hash with basic information about the application (name,
* instance id, instance index, etc.), and VCAP_SERVICES is a hash of lists where the keys are
* service labels and the values are lists of hashes of service instance meta data. Examples are:
*
* <pre class="code">
* VCAP_APPLICATION: {"instance_id":"2ce0ac627a6c8e47e936d829a3a47b5b","instance_index":0,
* "version":"0138c4a6-2a73-416b-aca0-572c09f7ca53","name":"foo",
* "uris":["foo.cfapps.io"], ...}
* VCAP_SERVICES: {"rds-mysql-1.0":[{"name":"mysql","label":"rds-mysql-1.0","plan":"10mb",
* "credentials":{"name":"d04fb13d27d964c62b267bbba1cffb9da","hostname":"mysql-service-public.clqg2e2w3ecf.us-east-1.rds.amazonaws.com",
* "host":"mysql-service-public.clqg2e2w3ecf.us-east-1.rds.amazonaws.com","port":3306,"user":"******",
* "username":"******","password":"******"}
* }]}
* </pre>
*
* These objects are flattened into properties. The VCAP_APPLICATION object goes straight to {@code
* vcap.application.*} in a fairly obvious way, and the VCAP_SERVICES object is unwrapped so that it
* is a hash of objects with key equal to the service instance name (e.g. "mysql" in the example
* above), and value equal to that instances properties, and then flattened in the same way. E.g.
*
* <pre class="code">
* vcap.application.instance_id: 2ce0ac627a6c8e47e936d829a3a47b5b
* vcap.application.version: 0138c4a6-2a73-416b-aca0-572c09f7ca53
* vcap.application.name: foo
* vcap.application.uris[0]: foo.cfapps.io
*
* vcap.services.mysql.name: mysql
* vcap.services.mysql.label: rds-mysql-1.0
* vcap.services.mysql.credentials.name: d04fb13d27d964c62b267bbba1cffb9da
* vcap.services.mysql.credentials.port: 3306
* vcap.services.mysql.credentials.host: mysql-service-public.clqg2e2w3ecf.us-east-1.rds.amazonaws.com
* vcap.services.mysql.credentials.username: urpRuqTf8Cpe6
* vcap.services.mysql.credentials.password: pxLsGVpsC9A5S
* ...
* </pre>
*
* N.B. this initializer is mainly intended for informational use (the application and instance ids
* are particularly useful). For service binding you might find that Spring Cloud is more convenient
* and more robust against potential changes in Cloud Foundry.
*
* @author Dave Syer
* @author Andy Wilkinson
*/
public class CloudFoundryVcapEnvironmentPostProcessor implements EnvironmentPostProcessor, Ordered {
private static final Log logger =
LogFactory.getLog(CloudFoundryVcapEnvironmentPostProcessor.class);
private static final String VCAP_APPLICATION = "VCAP_APPLICATION";
private static final String VCAP_SERVICES = "VCAP_SERVICES";
// Before ConfigFileEnvironmentPostProcessor so values there can use these ones
private int order = ConfigFileEnvironmentPostProcessor.DEFAULT_ORDER - 1;
private final JsonParser parser = JsonParserFactory.getJsonParser();
public void setOrder(int order) {
this.order = order;
}
@Override
public int getOrder() {
return this.order;
}
@Override
public void postProcessEnvironment(
ConfigurableEnvironment environment, SpringApplication application) {
if (CloudPlatform.CLOUD_FOUNDRY.isActive(environment)) {
Properties properties = new Properties();
addWithPrefix(properties, getPropertiesFromApplication(environment), "vcap.application.");
addWithPrefix(properties, getPropertiesFromServices(environment), "vcap.services.");
MutablePropertySources propertySources = environment.getPropertySources();
if (propertySources.contains(CommandLinePropertySource.COMMAND_LINE_PROPERTY_SOURCE_NAME)) {
propertySources.addAfter(
CommandLinePropertySource.COMMAND_LINE_PROPERTY_SOURCE_NAME,
new PropertiesPropertySource("vcap", properties));
} else {
propertySources.addFirst(new PropertiesPropertySource("vcap", properties));
}
}
}
private void addWithPrefix(Properties properties, Properties other, String prefix) {
for (String key : other.stringPropertyNames()) {
String prefixed = prefix + key;
properties.setProperty(prefixed, other.getProperty(key));
}
}
private Properties getPropertiesFromApplication(Environment environment) {
Properties properties = new Properties();
try {
String property = environment.getProperty(VCAP_APPLICATION, "{}");
Map<String, Object> map = this.parser.parseMap(property);
extractPropertiesFromApplication(properties, map);
} catch (Exception ex) {
logger.error("Could not parse VCAP_APPLICATION", ex);
}
return properties;
}
private Properties getPropertiesFromServices(Environment environment) {
Properties properties = new Properties();
try {
String property = environment.getProperty(VCAP_SERVICES, "{}");
Map<String, Object> map = this.parser.parseMap(property);
extractPropertiesFromServices(properties, map);
} catch (Exception ex) {
logger.error("Could not parse VCAP_SERVICES", ex);
}
return properties;
}
private void extractPropertiesFromApplication(Properties properties, Map<String, Object> map) {
if (map != null) {
flatten(properties, map, "");
}
}
private void extractPropertiesFromServices(Properties properties, Map<String, Object> map) {
if (map != null) {
for (Object services : map.values()) {
@SuppressWarnings("unchecked")
List<Object> list = (List<Object>) services;
for (Object object : list) {
@SuppressWarnings("unchecked")
Map<String, Object> service = (Map<String, Object>) object;
String key = (String) service.get("name");
if (key == null) {
key = (String) service.get("label");
}
flatten(properties, service, key);
}
}
}
}
@SuppressWarnings("unchecked")
private void flatten(Properties properties, Map<String, Object> input, String path) {
for (Entry<String, Object> entry : input.entrySet()) {
String key = getFullKey(path, entry.getKey());
Object value = entry.getValue();
if (value instanceof Map) {
// Need a compound key
flatten(properties, (Map<String, Object>) value, key);
} else if (value instanceof Collection) {
// Need a compound key
Collection<Object> collection = (Collection<Object>) value;
properties.put(key, StringUtils.collectionToCommaDelimitedString(collection));
int count = 0;
for (Object item : collection) {
String itemKey = "[" + (count++) + "]";
flatten(properties, Collections.singletonMap(itemKey, item), key);
}
} else if (value instanceof String) {
properties.put(key, value);
} else if (value instanceof Number) {
properties.put(key, value.toString());
} else if (value instanceof Boolean) {
properties.put(key, value.toString());
} else {
properties.put(key, value == null ? "" : value);
}
}
}
private String getFullKey(String path, String key) {
if (!StringUtils.hasText(path)) {
return key;
}
if (key.startsWith("[")) {
return path + key;
}
return path + "." + key;
}
}
