Jian Li | 69600e0 | 2018-12-24 13:21:18 +0900 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2018-present Open Networking Foundation |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onosproject.openstacktelemetry.impl; |
| 17 | |
| 18 | import com.google.common.collect.ImmutableMap; |
| 19 | import com.google.common.collect.Lists; |
| 20 | import com.google.common.collect.Maps; |
| 21 | import org.apache.commons.configuration.ConfigurationException; |
| 22 | import org.apache.commons.configuration.HierarchicalConfiguration; |
| 23 | import org.apache.commons.configuration.XMLConfiguration; |
| 24 | import org.onosproject.openstacktelemetry.api.config.TelemetryConfig; |
| 25 | |
| 26 | import java.io.IOException; |
| 27 | import java.io.InputStream; |
| 28 | import java.util.Arrays; |
| 29 | import java.util.List; |
| 30 | import java.util.Map; |
| 31 | import java.util.stream.Collectors; |
| 32 | |
| 33 | import static org.onosproject.openstacktelemetry.api.config.TelemetryConfig.ConfigType.GRPC; |
| 34 | import static org.onosproject.openstacktelemetry.api.config.TelemetryConfig.ConfigType.INFLUXDB; |
| 35 | import static org.onosproject.openstacktelemetry.api.config.TelemetryConfig.ConfigType.KAFKA; |
| 36 | import static org.onosproject.openstacktelemetry.api.config.TelemetryConfig.ConfigType.PROMETHEUS; |
| 37 | import static org.onosproject.openstacktelemetry.api.config.TelemetryConfig.ConfigType.REST; |
| 38 | import static org.onosproject.openstacktelemetry.api.config.TelemetryConfig.ConfigType.UNKNOWN; |
| 39 | |
| 40 | /** |
| 41 | * Utility capable of reading telemetry configuration XML resources and producing |
| 42 | * a telemetry config as a result. |
| 43 | * <p> |
| 44 | * The telemetry configurations stream structure is as follows: |
| 45 | * </p> |
| 46 | * <pre> |
| 47 | * <configs> |
| 48 | * <config name=“...” [manufacturer="..." swVersion="..."]> |
| 49 | * [<property name=“key”>value</key>] |
| 50 | * ... |
| 51 | * </config> |
| 52 | * ... |
| 53 | * </configs> |
| 54 | * </pre> |
| 55 | */ |
| 56 | public class XmlTelemetryConfigLoader { |
| 57 | |
| 58 | private static final String CONFIGS = "configs"; |
| 59 | private static final String CONFIG = "config"; |
| 60 | |
| 61 | private static final String PROPERTY = "property"; |
| 62 | |
| 63 | private static final String TRUE = "true"; |
| 64 | |
| 65 | private static final String NAME = "[@name]"; |
| 66 | private static final String TYPE = "[@type]"; |
| 67 | private static final String EXTENDS = "[@extends]"; |
| 68 | private static final String MFG = "[@manufacturer]"; |
| 69 | private static final String SW = "[@swVersion]"; |
| 70 | private static final String ENABLED = "[@enabled]"; |
| 71 | |
| 72 | private Map<String, TelemetryConfig> configs = Maps.newHashMap(); |
| 73 | |
| 74 | /** |
| 75 | * Creates a new config loader capable of loading configs from the supplied |
| 76 | * class loader. |
| 77 | */ |
| 78 | public XmlTelemetryConfigLoader() { |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Loads the specified telemetry configs resource as an XML stream and parses |
| 83 | * it to produce a ready-to-register config provider. |
| 84 | * |
| 85 | * @param configsStream stream containing the telemetry configs definition |
| 86 | * @return telemetry configuration provider |
| 87 | * @throws IOException if issues are encountered reading the stream |
| 88 | * or parsing the telemetry config definition within |
| 89 | */ |
| 90 | public DefaultTelemetryConfigProvider |
| 91 | loadTelemetryConfigs(InputStream configsStream) throws IOException { |
| 92 | try { |
| 93 | XMLConfiguration cfg = new XMLConfiguration(); |
| 94 | cfg.setRootElementName(CONFIGS); |
| 95 | cfg.setAttributeSplittingDisabled(true); |
| 96 | |
| 97 | cfg.load(configsStream); |
| 98 | return loadTelemetryConfigs(cfg); |
| 99 | } catch (ConfigurationException e) { |
| 100 | throw new IOException("Unable to load telemetry configs", e); |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Loads a telemetry config provider from the supplied hierarchical configuration. |
| 106 | * |
| 107 | * @param telemetryConfig hierarchical configuration containing the configs definition |
| 108 | * @return telemetry configuration provider |
| 109 | */ |
| 110 | public DefaultTelemetryConfigProvider |
| 111 | loadTelemetryConfigs(HierarchicalConfiguration telemetryConfig) { |
| 112 | DefaultTelemetryConfigProvider provider = new DefaultTelemetryConfigProvider(); |
| 113 | for (HierarchicalConfiguration cfg : telemetryConfig.configurationsAt(CONFIG)) { |
| 114 | DefaultTelemetryConfig config = loadTelemetryConfig(cfg); |
| 115 | configs.put(config.name(), config); |
| 116 | provider.addConfig(config); |
| 117 | } |
| 118 | configs.clear(); |
| 119 | return provider; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Loads a telemetry configuration from the supplied hierarchical configuration. |
| 124 | * |
| 125 | * @param telemetryCfg hierarchical configuration containing the telemetry config definition |
| 126 | * @return telemetry configuration |
| 127 | */ |
| 128 | public DefaultTelemetryConfig loadTelemetryConfig(HierarchicalConfiguration telemetryCfg) { |
| 129 | String name = telemetryCfg.getString(NAME); |
| 130 | String parentsString = telemetryCfg.getString(EXTENDS, ""); |
| 131 | List<TelemetryConfig> parents = Lists.newArrayList(); |
| 132 | |
| 133 | if (!"".equals(parentsString)) { |
| 134 | List<String> parentsNames; |
| 135 | if (parentsString.contains(",")) { |
| 136 | parentsNames = Arrays.asList( |
| 137 | parentsString.replace(" ", "").split(",")); |
| 138 | } else { |
| 139 | parentsNames = Lists.newArrayList(parentsString); |
| 140 | } |
| 141 | parents = parentsNames.stream().map(parent -> (parent != null) ? |
| 142 | configs.get(parent) : null).collect(Collectors.toList()); |
| 143 | } |
| 144 | |
| 145 | String typeStr = telemetryCfg.getString(TYPE, getParentAttribute(parents, TYPE)); |
| 146 | String manufacturer = telemetryCfg.getString(MFG, getParentAttribute(parents, MFG)); |
| 147 | String swVersion = telemetryCfg.getString(SW, getParentAttribute(parents, SW)); |
| 148 | |
| 149 | // note that we do not inherits enabled property from parent |
| 150 | String enabledStr = telemetryCfg.getString(ENABLED); |
| 151 | |
| 152 | boolean enabled = enabledStr != null && enabledStr.equalsIgnoreCase(TRUE); |
| 153 | |
| 154 | TelemetryConfig.ConfigType type = type(typeStr); |
| 155 | |
| 156 | if (type == null) { |
| 157 | return null; |
| 158 | } |
| 159 | |
| 160 | return new DefaultTelemetryConfig(name, type, parents, manufacturer, |
| 161 | swVersion, enabled, parseProperties(parents, telemetryCfg)); |
| 162 | } |
| 163 | |
| 164 | private TelemetryConfig.ConfigType type(String typeStr) { |
| 165 | switch (typeStr.toUpperCase()) { |
| 166 | case "GRPC" : |
| 167 | return GRPC; |
| 168 | case "KAFKA": |
| 169 | return KAFKA; |
| 170 | case "REST": |
| 171 | return REST; |
| 172 | case "INFLUXDB": |
| 173 | return INFLUXDB; |
| 174 | case "PROMETHEUS": |
| 175 | return PROMETHEUS; |
| 176 | case "UNKNOWN": |
| 177 | default: |
| 178 | return UNKNOWN; |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | // Returns the specified property from the highest priority parent |
| 183 | private String getParentAttribute(List<TelemetryConfig> parents, String attribute) { |
| 184 | if (!parents.isEmpty()) { |
| 185 | TelemetryConfig parent = parents.get(0); |
| 186 | switch (attribute) { |
| 187 | case TYPE: |
| 188 | return parent.type().name().toLowerCase(); |
| 189 | case MFG: |
| 190 | return parent.manufacturer(); |
| 191 | case SW: |
| 192 | return parent.swVersion(); |
| 193 | default: |
| 194 | throw new IllegalArgumentException("Unsupported attribute"); |
| 195 | } |
| 196 | } |
| 197 | return ""; |
| 198 | } |
| 199 | |
| 200 | // Parses the properties section. |
| 201 | private Map<String, String> parseProperties(List<TelemetryConfig> parents, |
| 202 | HierarchicalConfiguration config) { |
| 203 | ImmutableMap.Builder<String, String> properties = ImmutableMap.builder(); |
| 204 | |
| 205 | // note that, we only allow the inheritance from single source |
| 206 | Map<String, String> parentConfigs = Maps.newHashMap(); |
| 207 | if (!parents.isEmpty()) { |
| 208 | TelemetryConfig parent = parents.get(0); |
| 209 | parentConfigs = parent.properties(); |
| 210 | } |
| 211 | |
| 212 | properties.putAll(parentConfigs); |
| 213 | |
| 214 | for (HierarchicalConfiguration b : config.configurationsAt(PROPERTY)) { |
| 215 | properties.put(b.getString(NAME), (String) b.getRootNode().getValue()); |
| 216 | } |
| 217 | return properties.build(); |
| 218 | } |
| 219 | } |