1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
/*
* ================================================================================
* Copyright (c) 2018 AT&T Intellectual Property. 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.analytics.model.util.supplier;
import java.util.List;
import java.util.Optional;
import java.util.function.Function;
import java.util.function.Supplier;
import org.onap.dcae.analytics.model.configbindingservice.ConfigBindingServiceConstants;
import org.onap.dcae.analytics.model.configbindingservice.ConsulConfigBindingServiceQueryResponse;
import org.onap.dcae.analytics.model.util.function.StringToURLFunction;
import org.onap.dcae.analytics.model.util.function.URLToHttpGetFunction;
import org.onap.dcae.analytics.model.util.json.AnalyticsModelJsonConversion;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A Function which fetches ApplicationProperties configuration from
* Config Binding Service when deployed via docker, typically during application startup time.
*
* @author Rajiv Singla
*/
public class ConfigBindingServiceJsonSupplier implements Supplier<Optional<String>> {
private static final Logger logger = LoggerFactory.getLogger(ConfigBindingServiceJsonSupplier.class);
private final Function<String, Optional<String>> fetchUrlContentFunction;
public ConfigBindingServiceJsonSupplier(final Function<String, Optional<String>> fetchUrlContentFunction) {
this.fetchUrlContentFunction = fetchUrlContentFunction;
}
public ConfigBindingServiceJsonSupplier() {
fetchUrlContentFunction = (String s) -> new StringToURLFunction().apply(s).flatMap(new URLToHttpGetFunction());
}
@Override
public Optional<String> get() {
logger.info("Consul Host Environment Variable: {}",
ConfigBindingServiceConstants.CONSUL_HOST_ENV_VARIABLE_VALUE);
logger.info("Config Binding Service Environment Variable: {}",
ConfigBindingServiceConstants.CONFIG_BINDING_SERVICE_ENV_VARIABLE_VALUE);
logger.info("Service Name Environment Variable: {}",
ConfigBindingServiceConstants.SERVICE_NAME_ENV_VARIABLE_VALUE);
if (ConfigBindingServiceConstants.CONSUL_HOST_ENV_VARIABLE_VALUE == null ||
ConfigBindingServiceConstants.CONFIG_BINDING_SERVICE_ENV_VARIABLE_VALUE == null ||
ConfigBindingServiceConstants.SERVICE_NAME_ENV_VARIABLE_VALUE == null) {
logger.error("Environment variables required to query Config Binding Service are not present");
return Optional.empty();
}
return Optional.of(ConfigBindingServiceConstants.CONSUL_QUERY_URL_STRING)
// Step 1: Query CONSUL to get the IP/PORT of CONFIG BINDING SERVICE
.flatMap(fetchUrlContentFunction)
// Step 2: Fetch the generated configurations from CONFIG BINDING SERVICE
.flatMap(ConfigBindingServiceJsonSupplier::parseConsulConfigBindingServiceQueryResponseJson)
// Step 3: create url from service address and service port
.flatMap(ConfigBindingServiceJsonSupplier::createConfigServiceURL)
// Step 4: Fetch final config binding service generated application configuration json string
.flatMap(fetchUrlContentFunction);
}
/**
* Creates URL using config binding service ip address and port
*
* @param consulConfigBindingServiceQueryResponse consul config binding service query response containing config
* binding service address and service port
*
* @return config service url to fetch service configuration
*/
private static Optional<String> createConfigServiceURL(final ConsulConfigBindingServiceQueryResponse
consulConfigBindingServiceQueryResponse) {
final String configBindingServiceAddress = consulConfigBindingServiceQueryResponse.getServiceAddress();
final Integer configServicePort = consulConfigBindingServiceQueryResponse.getServicePort();
if (configBindingServiceAddress == null && configServicePort == null) {
logger.error("Config Binding Service Address & Port are not present.");
return Optional.empty();
}
return Optional.of(String.format(ConfigBindingServiceConstants.CONFIG_SERVICE_QUERY_URL_STRING,
configBindingServiceAddress, configServicePort,
ConfigBindingServiceConstants.SERVICE_NAME_ENV_VARIABLE_VALUE));
}
private static Optional<ConsulConfigBindingServiceQueryResponse>
parseConsulConfigBindingServiceQueryResponseJson(final String configBindingServiceQueryResponseJson) {
// parse json
final Optional<List<ConsulConfigBindingServiceQueryResponse>> configBindingServiceQueryResponseOptional =
AnalyticsModelJsonConversion.CONFIG_BINDING_SERVICE_LIST_JSON_FUNCTION
.apply(configBindingServiceQueryResponseJson);
// check parsing is successful and at least 1 config binding query response is present
if (!configBindingServiceQueryResponseOptional.isPresent() ||
configBindingServiceQueryResponseOptional.get().isEmpty()) {
logger.error("No Consul config binding service information found in JSON: {} ",
configBindingServiceQueryResponseJson);
return Optional.empty();
}
// return first consul query response
return Optional.of(configBindingServiceQueryResponseOptional.get().get(0));
}
}
|
