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Asynchronous HTTP/2 RPC/REST client/server library built on top of Java 8, Netty, Thrift and gRPC (armeria-xds)
There is a newer version: 1.31.3
/*
 * Copyright 2023 LINE Corporation
 *
 * LINE Corporation licenses this file to you 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:
 *
 *   https://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 com.linecorp.armeria.xds;

import com.linecorp.armeria.common.annotation.Nullable;

import io.envoyproxy.envoy.config.bootstrap.v3.Bootstrap;
import io.envoyproxy.envoy.config.bootstrap.v3.Bootstrap.DynamicResources;
import io.envoyproxy.envoy.config.core.v3.ConfigSource;

final class ConfigSourceMapper {

    private final Bootstrap bootstrap;
    @Nullable
    private final ConfigSource bootstrapCdsConfig;
    @Nullable
    private final ConfigSource bootstrapLdsConfig;
    @Nullable
    private final ConfigSource bootstrapAdsConfig;
    @Nullable
    private ConfigSource parentConfigSource;

    ConfigSourceMapper(Bootstrap bootstrap) {
        this(bootstrap, null);
    }

    ConfigSourceMapper(Bootstrap bootstrap, @Nullable ConfigSource parentConfigSource) {
        this.bootstrap = bootstrap;
        if (this.bootstrap.hasDynamicResources()) {
            final DynamicResources dynamicResources = bootstrap.getDynamicResources();
            bootstrapCdsConfig = dynamicResources.getCdsConfig();
            if (dynamicResources.hasAdsConfig()) {
                bootstrapAdsConfig = ConfigSource.newBuilder()
                                                 .setApiConfigSource(dynamicResources.getAdsConfig())
                                                 .build();
            } else {
                bootstrapAdsConfig = null;
            }
            bootstrapLdsConfig = dynamicResources.getLdsConfig();
        } else {
            bootstrapCdsConfig = null;
            bootstrapLdsConfig = null;
            bootstrapAdsConfig = null;
        }
        this.parentConfigSource = parentConfigSource;
    }

    ConfigSourceMapper withParentConfigSource(@Nullable ConfigSource parentConfigSource) {
        return new ConfigSourceMapper(bootstrap, parentConfigSource);
    }

    ConfigSource edsConfigSource(@Nullable ConfigSource configSource, String resourceName) {
        if (configSource != null) {
            if (configSource.hasApiConfigSource()) {
                return configSource;
            }
            if (configSource.hasSelf() && parentConfigSource != null) {
                return parentConfigSource;
            }
        }
        if (bootstrapAdsConfig != null) {
            return bootstrapAdsConfig;
        }
        throw new IllegalArgumentException("Cannot find an EDS config source for " + resourceName);
    }

    ConfigSource cdsConfigSource(@Nullable ConfigSource configSource, String resourceName) {
        if (configSource != null) {
            if (configSource.hasApiConfigSource()) {
                return configSource;
            }
            if (configSource.hasSelf() && parentConfigSource != null) {
                return parentConfigSource;
            }
            if (configSource.hasAds() && bootstrapAdsConfig != null) {
                return bootstrapAdsConfig;
            }
        }
        if (bootstrapCdsConfig != null && bootstrapCdsConfig.hasApiConfigSource()) {
            return bootstrapCdsConfig;
        }
        if (bootstrapAdsConfig != null) {
            return bootstrapAdsConfig;
        }
        throw new IllegalArgumentException("Cannot find a CDS config source for route: " + resourceName);
    }

    ConfigSource rdsConfigSource(@Nullable ConfigSource configSource, String resourceName) {
        if (configSource != null) {
            if (configSource.hasApiConfigSource()) {
                return configSource;
            }
            if (configSource.hasSelf() && parentConfigSource != null) {
                return parentConfigSource;
            }
        }
        if (bootstrapAdsConfig != null) {
            return bootstrapAdsConfig;
        }
        throw new IllegalArgumentException("Cannot find an RDS config source for route: " + resourceName);
    }

    ConfigSource ldsConfigSource(@Nullable ConfigSource configSource, String resourceName) {
        if (configSource != null) {
            if (configSource.hasApiConfigSource()) {
                return configSource;
            }
            if (configSource.hasSelf() && parentConfigSource != null) {
                return parentConfigSource;
            }
            if (configSource.hasAds() && bootstrapAdsConfig != null) {
                return bootstrapAdsConfig;
            }
        }
        if (bootstrapLdsConfig != null && bootstrapLdsConfig.hasApiConfigSource()) {
            return bootstrapLdsConfig;
        }
        if (bootstrapAdsConfig != null) {
            return bootstrapAdsConfig;
        }
        throw new IllegalArgumentException("Cannot find an LDS config source for listener: " + resourceName);
    }
}