pnoltes commented on a change in pull request #223: URL: https://github.com/apache/celix/pull/223#discussion_r426400600
########## File path: bundles/pubsub/pubsub_utils/src/pubsub_serializer_handler.c ########## @@ -0,0 +1,360 @@ +/** + *Licensed to the Apache Software Foundation (ASF) under one + *or more contributor license agreements. See the NOTICE file + *distributed with this work for additional information + *regarding copyright ownership. The ASF 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 + * + * 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. + */ + + +#include "pubsub_serializer_handler.h" + +#include <string.h> + +#include "celix_version.h" +#include "pubsub_message_serialization_service.h" +#include "celix_log_helper.h" + +#define L_DEBUG(...) \ + celix_logHelper_debug(handler->logHelper, __VA_ARGS__) +#define L_INFO(...) \ + celix_logHelper_info(handler->logHelper, __VA_ARGS__) +#define L_WARN(...) \ + celix_logHelper_warning(handler->logHelper, __VA_ARGS__) +#define L_ERROR(...) \ + celix_logHelper_error(handler->logHelper, __VA_ARGS__) + +typedef struct pubsub_serialization_service_entry { + long svcId; + const celix_properties_t *properties; + uint32_t msgId; + celix_version_t* msgVersion; + char* msgFqn; + pubsub_message_serialization_service_t* svc; +} pubsub_serialization_service_entry_t; + +struct pubsub_serializer_handler { + celix_bundle_context_t* ctx; + bool backwardCompatible; + long serializationSvcTrackerId; + celix_log_helper_t *logHelper; + + celix_thread_rwlock_t lock; + hash_map_t *serializationServices; //key = msg id, value = sorted array list with pubsub_serialization_service_entry_t* +}; + +static void addSvc(void *handle, void* svc, const celix_properties_t *props) { + pubsub_serializer_handler_t* handler = handle; + pubsub_message_serialization_service_t* serSvc = svc; + pubsub_serializerHandler_addSerializationService(handler, serSvc, props); +} + +static void remSvc(void *handle, void* svc, const celix_properties_t *props) { + pubsub_serializer_handler_t* handler = handle; + pubsub_message_serialization_service_t* serSvc = svc; + pubsub_serializerHandler_removeSerializationService(handler, serSvc, props); +} + +int compareEntries(const void *a, const void *b) { + const pubsub_serialization_service_entry_t* aEntry = a; + const pubsub_serialization_service_entry_t* bEntry = b; + + long servIdA = celix_properties_getAsLong(aEntry->properties, OSGI_FRAMEWORK_SERVICE_ID, 0); + long servIdB = celix_properties_getAsLong(bEntry->properties, OSGI_FRAMEWORK_SERVICE_ID, 0); + + long servRankingA = celix_properties_getAsLong(aEntry->properties, OSGI_FRAMEWORK_SERVICE_RANKING, 0); + long servRankingB = celix_properties_getAsLong(bEntry->properties, OSGI_FRAMEWORK_SERVICE_RANKING, 0); + + return utils_compareServiceIdsAndRanking(servIdA, servRankingA, servIdB, servRankingB); +} + +static pubsub_serialization_service_entry_t* findEntry(pubsub_serializer_handler_t* handler, uint32_t msgId) { + //NOTE assumes mutex is locked + celix_array_list_t* entries = hashMap_get(handler->serializationServices, (void*)(uintptr_t)msgId); + if (entries != NULL) { + return celix_arrayList_get(entries, 0); //NOTE if entries not null, always at least 1 entry + } + return NULL; +} + +static bool isCompatible(pubsub_serializer_handler_t* handler, pubsub_serialization_service_entry_t* entry, int serializedMajorVersion, int serializedMinorVersion) { + bool compatible = false; + if (handler->backwardCompatible) { + compatible = celix_version_isUserCompatible(entry->msgVersion, serializedMajorVersion, serializedMinorVersion); + } else { + int major = celix_version_getMajor(entry->msgVersion); + int minor = celix_version_getMinor(entry->msgVersion); + compatible = major == serializedMajorVersion && minor == serializedMinorVersion; + } + return compatible; +} + +static const char* getMsgFqn(pubsub_serializer_handler_t* handler, uint32_t msgId) { + //NOTE assumes mutex is locked + const char *result = NULL; + celix_array_list_t* entries = hashMap_get(handler->serializationServices, (void*)(uintptr_t)msgId); + if (entries != NULL) { + pubsub_serialization_service_entry_t *entry = celix_arrayList_get(entries, 0); //NOTE if an entries exists, there is at least 1 entry. + result = entry->msgFqn; + } + return result; +} + +pubsub_serializer_handler_t* pubsub_serializerHandler_create(celix_bundle_context_t* ctx, const char* serializerType, bool backwardCompatible) { + pubsub_serializer_handler_t* handler = calloc(1, sizeof(*handler)); + handler->ctx = ctx; + handler->backwardCompatible = backwardCompatible; + + handler->logHelper = celix_logHelper_create(ctx, "celix_pubsub_serialization_handler"); + + celixThreadRwlock_create(&handler->lock, NULL); + handler->serializationServices = hashMap_create(NULL, NULL, NULL, NULL); + + char *filter = NULL; + asprintf(&filter, "(%s=%s)", PUBSUB_MESSAGE_SERIALIZATION_SERVICE_SERIALIZATION_TYPE_PROPERTY, serializerType); + celix_service_tracking_options_t opts = CELIX_EMPTY_SERVICE_TRACKING_OPTIONS; + opts.filter.serviceName = PUBSUB_MESSAGE_SERIALIZATION_SERVICE_NAME; + opts.filter.versionRange = PUBSUB_MESSAGE_SERIALIZATION_SERVICE_RANGE; + opts.filter.filter = filter; + opts.callbackHandle = handler; + opts.addWithProperties = addSvc; + opts.removeWithProperties = remSvc; + handler->serializationSvcTrackerId = celix_bundleContext_trackServicesWithOptions(ctx, &opts); + free(filter); + + return handler; +} + + +void pubsub_serializerHandler_destroy(pubsub_serializer_handler_t* handler) { + if (handler != NULL) { + celix_bundleContext_stopTracker(handler->ctx, handler->serializationSvcTrackerId); + celixThreadRwlock_destroy(&handler->lock); + hash_map_iterator_t iter = hashMapIterator_construct(handler->serializationServices); + while (hashMapIterator_hasNext(&iter)) { + celix_array_list_t *entries = hashMapIterator_nextValue(&iter); + for (int i = 0; i < celix_arrayList_size(entries); ++i) { + pubsub_serialization_service_entry_t* entry = celix_arrayList_get(entries, i); + free(entry->msgFqn); + celix_version_destroy(entry->msgVersion); + free(entry); + } + celix_arrayList_destroy(entries); + } + hashMap_destroy(handler->serializationServices, false, false); + celix_logHelper_destroy(handler->logHelper); + free(handler); + } +} + +void pubsub_serializerHandler_addSerializationService(pubsub_serializer_handler_t* handler, pubsub_message_serialization_service_t* svc, const celix_properties_t* svcProperties) { + long svcId = celix_properties_getAsLong(svcProperties, OSGI_FRAMEWORK_SERVICE_ID, -1L); + const char *msgFqn = celix_properties_get(svcProperties, PUBSUB_MESSAGE_SERIALIZATION_SERVICE_MSG_FQN_PROPERTY, NULL); + const char *version = celix_properties_get(svcProperties, PUBSUB_MESSAGE_SERIALIZATION_SERVICE_MSG_VERSION_PROPERTY, "0.0.0"); + uint32_t msgId = (uint32_t)celix_properties_getAsLong(svcProperties, PUBSUB_MESSAGE_SERIALIZATION_SERVICE_MSG_ID_PROPERTY, 0L); + + if (msgId == 0) { + msgId = celix_utils_stringHash(msgFqn); + } + + celix_version_t* msgVersion = celix_version_createVersionFromString(version); + if (msgVersion == NULL) { + L_ERROR("%s service has an invalid %s property. value is '%s'", PUBSUB_MESSAGE_SERIALIZATION_SERVICE_NAME, PUBSUB_MESSAGE_SERIALIZATION_SERVICE_MSG_VERSION_PROPERTY, msgVersion); + return; + } + + celixThreadRwlock_writeLock(&handler->lock); + + pubsub_serialization_service_entry_t* existingEntry = findEntry(handler, msgId); + + bool valid = true; + if (existingEntry != NULL && strncmp(existingEntry->msgFqn, msgFqn, 1024*1024) != 0) { + L_ERROR("Msg id clash. Registered serialization service with msg id %d and msg fqn '%s' clashes with an existing serialization service using the same msg id and msg fqn '%s'. Ignoring serialization service.", msgId, msgFqn, existingEntry->msgFqn); + valid = false; + } + + if (existingEntry != NULL && celix_version_compareTo(existingEntry->msgVersion, msgVersion) != 0) { + char* existingVersion = celix_version_toString(existingEntry->msgVersion); + L_ERROR("Mismatched message versions. Registered serialization service with msg '%s' with version %s, has a different version than an existing serialization service with version '%s'. Ignoring serialization service.", msgFqn, version, existingVersion); + free(existingVersion); + valid = false; + } + + if (valid) { + celix_array_list_t *entries = hashMap_get(handler->serializationServices, (void *) (uintptr_t) msgId); + if (entries == NULL) { + entries = celix_arrayList_create(); + } + pubsub_serialization_service_entry_t *entry = calloc(1, sizeof(*entry)); + entry->svcId = svcId; + entry->properties = svcProperties; + entry->msgFqn = celix_utils_strdup(msgFqn); + entry->msgId = msgId; + entry->msgVersion = msgVersion; + entry->svc = svc; + celix_arrayList_add(entries, entry); + celix_arrayList_sort(entries, compareEntries); + + hashMap_put(handler->serializationServices, (void *) (uintptr_t) msgId, entries); + } else { + celix_version_destroy(msgVersion); + } + celixThreadRwlock_unlock(&handler->lock); +} + +void pubsub_serializerHandler_removeSerializationService(pubsub_serializer_handler_t* handler, pubsub_message_serialization_service_t* svc, const celix_properties_t* svcProperties) { + long svcId = celix_properties_getAsLong(svcProperties, OSGI_FRAMEWORK_SERVICE_ID, -1L); + const char *msgFqn = celix_properties_get(svcProperties, PUBSUB_MESSAGE_SERIALIZATION_SERVICE_MSG_FQN_PROPERTY, NULL); + uint32_t msgId = (uint32_t)celix_properties_getAsLong(svcProperties, PUBSUB_MESSAGE_SERIALIZATION_SERVICE_MSG_ID_PROPERTY, 0L); + if (msgId == 0) { + msgId = celix_utils_stringHash(msgFqn); + } + + celixThreadRwlock_writeLock(&handler->lock); + celix_array_list_t* entries = hashMap_get(handler->serializationServices, (void*)(uintptr_t)msgId); + if (entries != NULL) { + pubsub_serialization_service_entry_t *found = NULL; + for (int i = 0; i < celix_arrayList_size(entries); ++i) { + pubsub_serialization_service_entry_t *entry = celix_arrayList_get(entries, i); + if (entry->svcId == svcId) { + found = entry; + celix_arrayList_removeAt(entries, i); + celix_arrayList_sort(entries, compareEntries); + break; + } + } + if (found != NULL) { + free(found->msgFqn); + celix_version_destroy(found->msgVersion); + free(found); + } + if (celix_arrayList_size(entries) == 0) { + hashMap_remove(handler->serializationServices, (void*)(uintptr_t)msgId); + celix_arrayList_destroy(entries); + } + } + celixThreadRwlock_unlock(&handler->lock); +} + +celix_status_t pubsub_serializerHandler_serialize(pubsub_serializer_handler_t* handler, uint32_t msgId, const void* input, struct iovec** output, size_t* outputIovLen) { Review comment: Because struct iovec** output is an array iovecs. I added the message serialization service doc as used in the pubsub serialization handler doc, maybe this makes it more clearer. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
