policy-agent/src/main/java/org/oransc/policyagent/controllers/PolicyController.java

   1 /*-
   2  * ========================LICENSE_START=================================
   3  * O-RAN-SC
   4  * %%
   5  * Copyright (C) 2019 Nordix Foundation
   6  * %%
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ========================LICENSE_END===================================
  19  */
  20
  21 package org.oransc.policyagent.controllers;
  22
  23 import com.google.gson.Gson;
  24 import com.google.gson.GsonBuilder;
  25
  26 import io.swagger.annotations.Api;
  27 import io.swagger.annotations.ApiOperation;
  28 import io.swagger.annotations.ApiResponse;
  29 import io.swagger.annotations.ApiResponses;
  30
  31 import java.util.ArrayList;
  32 import java.util.Collection;
  33 import java.util.List;
  34
  35 import org.oransc.policyagent.clients.A1ClientFactory;
  36 import org.oransc.policyagent.configuration.ApplicationConfig;
  37 import org.oransc.policyagent.exceptions.ServiceException;
  38 import org.oransc.policyagent.repository.ImmutablePolicy;
  39 import org.oransc.policyagent.repository.Lock.LockType;
  40 import org.oransc.policyagent.repository.Policies;
  41 import org.oransc.policyagent.repository.Policy;
  42 import org.oransc.policyagent.repository.PolicyType;
  43 import org.oransc.policyagent.repository.PolicyTypes;
  44 import org.oransc.policyagent.repository.Ric;
  45 import org.oransc.policyagent.repository.Rics;
  46 import org.springframework.beans.factory.annotation.Autowired;
  47 import org.springframework.http.HttpStatus;
  48 import org.springframework.http.ResponseEntity;
  49 import org.springframework.web.bind.annotation.DeleteMapping;
  50 import org.springframework.web.bind.annotation.GetMapping;
  51 import org.springframework.web.bind.annotation.PutMapping;
  52 import org.springframework.web.bind.annotation.RequestBody;
  53 import org.springframework.web.bind.annotation.RequestParam;
  54 import org.springframework.web.bind.annotation.RestController;
  55 import reactor.core.publisher.Mono;
  56
  57 @RestController
  58 @Api(value = "Policy Management API")
  59 public class PolicyController {
  60
  61     private final Rics rics;
  62     private final PolicyTypes policyTypes;
  63     private final Policies policies;
  64     private final A1ClientFactory a1ClientFactory;
  65
  66     private static Gson gson = new GsonBuilder() //
  67         .serializeNulls() //
  68         .create(); //
  69
  70     @Autowired
  71     PolicyController(ApplicationConfig config, PolicyTypes types, Policies policies, Rics rics,
  72         A1ClientFactory a1ClientFactory) {
  73         this.policyTypes = types;
  74         this.policies = policies;
  75         this.rics = rics;
  76         this.a1ClientFactory = a1ClientFactory;
  77     }
  78
  79     @GetMapping("/policy_schemas")
  80     @ApiOperation(value = "Returns policy type schema definitions")
  81     @ApiResponses(
  82         value = {
  83             @ApiResponse(code = 200, message = "Policy schemas", response = Object.class, responseContainer = "List")})
  84     public ResponseEntity<String> getPolicySchemas(@RequestParam(name = "ric", required = false) String ricName) {
  85         synchronized (this.policyTypes) {
  86             if (ricName == null) {
  87                 Collection<PolicyType> types = this.policyTypes.getAll();
  88                 return new ResponseEntity<>(toPolicyTypeSchemasJson(types), HttpStatus.OK);
  89             } else {
  90                 try {
  91                     Collection<PolicyType> types = rics.getRic(ricName).getSupportedPolicyTypes();
  92                     return new ResponseEntity<>(toPolicyTypeSchemasJson(types), HttpStatus.OK);
  93                 } catch (ServiceException e) {
  94                     return new ResponseEntity<>(e.toString(), HttpStatus.NOT_FOUND);
  95                 }
  96             }
  97         }
  98     }
  99
 100     @GetMapping("/policy_schema")
 101     @ApiOperation(value = "Returns one policy type schema definition")
 102     @ApiResponses(value = {@ApiResponse(code = 200, message = "Policy schema", response = Object.class)})
 103     public ResponseEntity<String> getPolicySchema(@RequestParam(name = "id", required = true) String id) {
 104         try {
 105             PolicyType type = policyTypes.getType(id);
 106             return new ResponseEntity<>(type.schema(), HttpStatus.OK);
 107         } catch (ServiceException e) {
 108             return new ResponseEntity<>(e.toString(), HttpStatus.NOT_FOUND);
 109         }
 110     }
 111
 112     @GetMapping("/policy_types")
 113     @ApiOperation(value = "Query policy type names")
 114     @ApiResponses(
 115         value = {@ApiResponse(
 116             code = 200,
 117             message = "Policy type names",
 118             response = String.class,
 119             responseContainer = "List")})
 120     public ResponseEntity<String> getPolicyTypes(@RequestParam(name = "ric", required = false) String ricName) {
 121         synchronized (this.policyTypes) {
 122             if (ricName == null) {
 123                 Collection<PolicyType> types = this.policyTypes.getAll();
 124                 return new ResponseEntity<>(toPolicyTypeIdsJson(types), HttpStatus.OK);
 125             } else {
 126                 try {
 127                     Collection<PolicyType> types = rics.getRic(ricName).getSupportedPolicyTypes();
 128                     return new ResponseEntity<>(toPolicyTypeIdsJson(types), HttpStatus.OK);
 129                 } catch (ServiceException e) {
 130                     return new ResponseEntity<>(e.toString(), HttpStatus.NOT_FOUND);
 131                 }
 132             }
 133         }
 134     }
 135
 136     @GetMapping("/policy")
 137     @ApiOperation(value = "Returns a policy configuration") //
 138     @ApiResponses(
 139         value = { //
 140             @ApiResponse(code = 200, message = "Policy found", response = Object.class), //
 141             @ApiResponse(code = 204, message = "Policy is not found")} //
 142     )
 143     public ResponseEntity<String> getPolicy( //
 144         @RequestParam(name = "instance", required = true) String instance) {
 145         try {
 146             Policy p = policies.getPolicy(instance);
 147             return new ResponseEntity<>(p.json(), HttpStatus.OK);
 148         } catch (ServiceException e) {
 149             return new ResponseEntity<>(e.getMessage(), HttpStatus.NO_CONTENT);
 150         }
 151     }
 152
 153     @DeleteMapping("/policy")
 154     @ApiOperation(value = "Delete a policy", response = Object.class)
 155     @ApiResponses(value = {@ApiResponse(code = 204, message = "Policy deleted", response = Object.class)})
 156     public Mono<ResponseEntity<Object>> deletePolicy( //
 157         @RequestParam(name = "instance", required = true) String id) {
 158         Policy policy = policies.get(id);
 159         if (policy != null && policy.ric().getState() == Ric.RicState.IDLE) {
 160             Ric ric = policy.ric();
 161             return ric.getLock().lock(LockType.SHARED) // //
 162                 .flatMap(lock -> a1ClientFactory.createA1Client(policy.ric())) //
 163                 .doOnNext(notUsed -> policies.remove(policy)) //
 164                 .flatMap(client -> client.deletePolicy(policy)) //
 165                 .doOnNext(notUsed -> ric.getLock().unlockBlocking()) //
 166                 .doOnError(notUsed -> ric.getLock().unlockBlocking()) //
 167                 .flatMap(notUsed -> Mono.just(new ResponseEntity<>(HttpStatus.NO_CONTENT)));
 168         } else if (policy != null) {
 169             return Mono.just(new ResponseEntity<>("Busy, recovering", HttpStatus.LOCKED));
 170         } else {
 171             return Mono.just(new ResponseEntity<>(HttpStatus.NOT_FOUND));
 172         }
 173     }
 174
 175     @PutMapping(path = "/policy")
 176     @ApiOperation(value = "Put a policy", response = String.class)
 177     @ApiResponses(value = {@ApiResponse(code = 200, message = "Policy created or updated")})
 178     public Mono<ResponseEntity<Object>> putPolicy( //
 179         @RequestParam(name = "type", required = true) String typeName, //
 180         @RequestParam(name = "instance", required = true) String instanceId, //
 181         @RequestParam(name = "ric", required = true) String ricName, //
 182         @RequestParam(name = "service", required = true) String service, //
 183         @RequestBody Object jsonBody) {
 184
 185         String jsonString = gson.toJson(jsonBody);
 186
 187         Ric ric = rics.get(ricName);
 188         PolicyType type = policyTypes.get(typeName);
 189         if (ric != null && type != null && ric.getState() == Ric.RicState.IDLE) {
 190             Policy policy = ImmutablePolicy.builder() //
 191                 .id(instanceId) //
 192                 .json(jsonString) //
 193                 .type(type) //
 194                 .ric(ric) //
 195                 .ownerServiceName(service) //
 196                 .lastModified(getTimeStampUtc()) //
 197                 .build();
 198
 199             final boolean isCreate = this.policies.get(policy.id()) == null;
 200
 201             return ric.getLock().lock(LockType.SHARED) //
 202                 .flatMap(p -> validateModifiedPolicy(policy)) //
 203                 .flatMap(notUsed -> a1ClientFactory.createA1Client(ric)) //
 204                 .flatMap(client -> client.putPolicy(policy)) //
 205                 .doOnNext(notUsed -> policies.put(policy)) //
 206                 .doOnNext(notUsed -> ric.getLock().unlockBlocking()) //
 207                 .doOnError(t -> ric.getLock().unlockBlocking()) //
 208                 .flatMap(notUsed -> Mono.just(new ResponseEntity<>(isCreate ? HttpStatus.CREATED : HttpStatus.OK))) //
 209                 .onErrorResume(t -> Mono.just(new ResponseEntity<>(t.getMessage(), HttpStatus.METHOD_NOT_ALLOWED)));
 210         }
 211
 212         return ric == null && type == null ? Mono.just(new ResponseEntity<>(HttpStatus.NOT_FOUND))
 213             : Mono.just(new ResponseEntity<>(HttpStatus.CONFLICT)); // Recovering
 214     }
 215
 216     private Mono<Object> validateModifiedPolicy(Policy policy) {
 217         // Check that ric is not updated
 218         Policy current = this.policies.get(policy.id());
 219         if (current != null) {
 220             if (!current.ric().name().equals(policy.ric().name())) {
 221                 return Mono.error(new Exception("Policy cannot change RIC, policyId: " + current.id() + //
 222                     ", RIC name: " + current.ric().name() + //
 223                     ", new name: " + policy.ric().name()));
 224             }
 225         }
 226         return Mono.just("OK");
 227     }
 228
 229     @GetMapping("/policies")
 230     @ApiOperation(value = "Query policies")
 231     @ApiResponses(
 232         value = {
 233             @ApiResponse(code = 200, message = "Policies", response = PolicyInfo.class, responseContainer = "List")})
 234     public ResponseEntity<String> getPolicies( //
 235         @RequestParam(name = "type", required = false) String type, //
 236         @RequestParam(name = "ric", required = false) String ric, //
 237         @RequestParam(name = "service", required = false) String service) //
 238     {
 239         synchronized (policies) {
 240             Collection<Policy> result = null;
 241
 242             if (type != null) {
 243                 result = policies.getForType(type);
 244                 result = filter(result, null, ric, service);
 245             } else if (service != null) {
 246                 result = policies.getForService(service);
 247                 result = filter(result, type, ric, null);
 248             } else if (ric != null) {
 249                 result = filter(policies.getForRic(ric), type, null, service);
 250             } else {
 251                 result = policies.getAll();
 252             }
 253
 254             String policiesJson;
 255             try {
 256                 policiesJson = policiesToJson(result);
 257             } catch (ServiceException e) {
 258                 return new ResponseEntity<>(e.getMessage(), HttpStatus.NO_CONTENT);
 259             }
 260             return new ResponseEntity<>(policiesJson, HttpStatus.OK);
 261         }
 262     }
 263
 264     @GetMapping("/policy_status")
 265     @ApiOperation(value = "Returns a policy status") //
 266     @ApiResponses(
 267         value = { //
 268             @ApiResponse(code = 200, message = "Policy status", response = Object.class), //
 269             @ApiResponse(code = 204, message = "Policy is not found", response = String.class)} //
 270     )
 271     public Mono<ResponseEntity<String>> getPolicyStatus( //
 272         @RequestParam(name = "instance", required = true) String instance) {
 273         try {
 274             Policy policy = policies.getPolicy(instance);
 275
 276             return a1ClientFactory.createA1Client(policy.ric()) //
 277                 .flatMap(client -> client.getPolicyStatus(policy)) //
 278                 .flatMap(status -> Mono.just(new ResponseEntity<>(status, HttpStatus.OK)));
 279         } catch (ServiceException e) {
 280             return Mono.just(new ResponseEntity<>(e.getMessage(), HttpStatus.NO_CONTENT));
 281         }
 282     }
 283
 284     private boolean include(String filter, String value) {
 285         return filter == null || value.equals(filter);
 286     }
 287
 288     private Collection<Policy> filter(Collection<Policy> collection, String type, String ric, String service) {
 289         if (type == null && ric == null && service == null) {
 290             return collection;
 291         }
 292         List<Policy> filtered = new ArrayList<>();
 293         for (Policy p : collection) {
 294             if (include(type, p.type().name()) && include(ric, p.ric().name())
 295                 && include(service, p.ownerServiceName())) {
 296                 filtered.add(p);
 297             }
 298         }
 299         return filtered;
 300     }
 301
 302     private String policiesToJson(Collection<Policy> policies) throws ServiceException {
 303         List<PolicyInfo> v = new ArrayList<>(policies.size());
 304         for (Policy p : policies) {
 305             PolicyInfo policyInfo = new PolicyInfo();
 306             policyInfo.id = p.id();
 307             policyInfo.json = fromJson(p.json());
 308             policyInfo.ric = p.ric().name();
 309             policyInfo.type = p.type().name();
 310             policyInfo.service = p.ownerServiceName();
 311             policyInfo.lastModified = p.lastModified();
 312             if (!policyInfo.validate()) {
 313                 throw new ServiceException("BUG, all fields must be set");
 314             }
 315             v.add(policyInfo);
 316         }
 317         return gson.toJson(v);
 318     }
 319
 320     private Object fromJson(String jsonStr) {
 321         return gson.fromJson(jsonStr, Object.class);
 322     }
 323
 324     private String toPolicyTypeSchemasJson(Collection<PolicyType> types) {
 325         StringBuilder result = new StringBuilder();
 326         result.append("[");
 327         boolean first = true;
 328         for (PolicyType t : types) {
 329             if (!first) {
 330                 result.append(",");
 331             }
 332             first = false;
 333             result.append(t.schema());
 334         }
 335         result.append("]");
 336         return result.toString();
 337     }
 338
 339     private String toPolicyTypeIdsJson(Collection<PolicyType> types) {
 340         List<String> v = new ArrayList<>(types.size());
 341         for (PolicyType t : types) {
 342             v.add(t.name());
 343         }
 344         return gson.toJson(v);
 345     }
 346
 347     private String getTimeStampUtc() {
 348         return java.time.Instant.now().toString();
 349     }
 350
 351 }