io.gravitee.node.container.spring.env.AbstractGraviteePropertySource Maven / Gradle / Ivy

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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.gravitee.node.container.spring.env;

import io.gravitee.node.kubernetes.propertyresolver.CloudScheme;
import io.gravitee.node.kubernetes.propertyresolver.PropertyResolver;
import io.gravitee.node.kubernetes.propertyresolver.PropertyResolverFactoriesLoader;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.core.env.EnumerablePropertySource;
import org.springframework.core.env.PropertySource;
import org.springframework.util.Assert;

/**
 * @author Kamiel Ahmadpour (kamiel.ahmadpour at graviteesource.com)
 * @author GraviteeSource Team
 */
public abstract class AbstractGraviteePropertySource extends EnumerablePropertySource> {

    private static final Logger LOGGER = LoggerFactory.getLogger(AbstractGraviteePropertySource.class);
    private final PropertyResolverFactoriesLoader propertyResolverLoader;

    protected AbstractGraviteePropertySource(String name, Map source, ApplicationContext applicationContext) {
        super(name, source);
        this.propertyResolverLoader = applicationContext.getBean(PropertyResolverFactoriesLoader.class);
    }

    @Override
    public String[] getPropertyNames() {
        return source.keySet().toArray(new String[0]);
    }

    @Override
    public Object getProperty(String name) {
        Assert.notNull(name, "Property name can not be null.");
        Object value = source.getOrDefault(name, getValue(name));

        if (value == null) {
            return null;
        }

        if (isCloudBased(value)) {
            for (PropertyResolver propertyResolver : propertyResolverLoader.getPropertyResolvers()) {
                if (propertyResolver.supports(value.toString())) {
                    Object resolvedValue = propertyResolver
                        .resolve(value.toString())
                        .doOnError(t -> {
                            LOGGER.error("Unable to resolve property {}", name, t);
                            source.put(name, null);
                        })
                        .blockingGet(); // property must be resolved before continuing with the rest of the code
                    source.put(name, resolvedValue); // to avoid resolving this property again

                    watchProperty(propertyResolver, name, value);

                    break;
                }
            }
        }

        return getValue(name);
    }

    protected abstract Object getValue(String key);

    private boolean isCloudBased(Object value) {
        for (CloudScheme cloudScheme : CloudScheme.values()) {
            if (value.toString().startsWith(cloudScheme.value())) {
                return true;
            }
        }

        return false;
    }

    private void watchProperty(PropertyResolver propertyResolver, String name, Object value) {
        propertyResolver
            .watch(value.toString())
            .doOnNext(newValue -> source.put(name, newValue))
            .doOnError(t -> LOGGER.error("Unable to update property {}", name, t))
            .doOnComplete(() -> watchProperty(propertyResolver, name, value))
            .subscribe();
    }
}