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/*-
* ============LICENSE_START=======================================================
* org.onap.dcaegen2.collectors.ves
* ================================================================================
* Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
* Copyright (C) 2018 Nokia. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.dcae.controller;
import static io.vavr.API.Try;
import static org.onap.dcae.common.publishing.VavrUtils.enhanceError;
import static org.onap.dcae.common.publishing.VavrUtils.f;
import static org.onap.dcae.controller.Conversions.toJson;
import static org.onap.dcae.controller.Conversions.toJsonArray;
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;
import io.vavr.control.Try;
import org.json.JSONArray;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
final class ConfigSource {
private static final Logger log = LoggerFactory.getLogger(ConfigSource.class);
static Try<JSONObject> getAppConfig(EnvProps envProps) {
log.info("Fetching app configuration from CBS");
return callConsulForCBSConfiguration(envProps)
.peek(strBody -> log.info(f("Received following CBS configuration from Consul '%s'", strBody)))
.flatMap(Conversions::toJsonArray)
.flatMap(ConfigSource::withdrawCatalog)
.flatMap(json -> constructFullCBSUrl(envProps, json))
.flatMap(cbsUrl -> callCBSForAppConfig(envProps, cbsUrl))
.flatMap(Conversions::toJson)
.peek(jsonNode -> log.info(f("Received app configuration: '%s'", jsonNode)))
.onFailure(exc -> log.error("Could not fetch application config", exc));
}
private static Try<String> callConsulForCBSConfiguration(EnvProps envProps) {
return executeGet(envProps.consulProtocol + "://" + envProps.consulHost + ":" +
envProps.consulPort + "/v1/catalog/service/" + envProps.cbsName)
.mapFailure(enhanceError("Unable to retrieve CBS configuration from Consul"));
}
private static Try<String> constructFullCBSUrl(EnvProps envProps, JSONObject json) {
return Try(() -> envProps.cbsProtocol + "://" + json.get("ServiceAddress").toString() + ":" +
json.get("ServicePort").toString())
.mapFailure(enhanceError("ServiceAddress / ServicePort missing from CBS conf: '%s'", json));
}
private static Try<JSONObject> withdrawCatalog(JSONArray json) {
return Try(() -> new JSONObject(json.get(0).toString()))
.mapFailure(enhanceError("CBS response '%s' is in invalid format,"
+ " most probably is it not a list of configuration objects", json));
}
private static Try<String> callCBSForAppConfig(EnvProps envProps, String cbsUrl) {
log.info("Calling CBS for application config");
return executeGet(cbsUrl + "/service_component/" + envProps.appName)
.mapFailure(enhanceError("Unable to fetch configuration from CBS"));
}
private static Try<String> executeGet(String url) {
log.info(f("Calling HTTP GET on url: '%s'", url));
return Try(() -> Unirest.get(url).asString())
.mapFailure(enhanceError("Http call (GET '%s') failed.", url))
.filter(
res -> res.getStatus() == 200,
res -> new RuntimeException(f("HTTP call (GET '%s') failed with status %s and body '%s'",
url, res.getStatus(), res.getBody())))
.map(HttpResponse::getBody)
.peek(body -> log.info(f("HTTP GET on '%s' returned body '%s'", url, body)));
}
}
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