/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. * * Copyright 2014-2017 (c) Julius Pfrommer, Fraunhofer IOSB * Copyright 2015-2016 (c) Sten Grüner * Copyright 2014-2015, 2017 (c) Florian Palm * Copyright 2015-2016 (c) Chris Iatrou * Copyright 2015-2016 (c) Oleksiy Vasylyev * Copyright 2016-2017 (c) Stefan Profanter, fortiss GmbH */ #ifndef UA_SERVER_H_ #define UA_SERVER_H_ #ifdef __cplusplus extern "C" { #endif #include "ua_types.h" #include "ua_types_generated.h" #include "ua_types_generated_handling.h" struct UA_ServerConfig; typedef struct UA_ServerConfig UA_ServerConfig; struct UA_Server; typedef struct UA_Server UA_Server; /** * .. _server: * * Server * ====== * * .. include:: server_config.rst * * .. _server-lifecycle: * * Server Lifecycle * ---------------- */ UA_Server UA_EXPORT * UA_Server_new(const UA_ServerConfig *config); void UA_EXPORT UA_Server_delete(UA_Server *server); /* Runs the main loop of the server. In each iteration, this calls into the * networklayers to see if messages have arrived. * * @param server The server object. * @param running The loop is run as long as *running is true. * Otherwise, the server shuts down. * @return Returns the statuscode of the UA_Server_run_shutdown method */ UA_StatusCode UA_EXPORT UA_Server_run(UA_Server *server, volatile UA_Boolean *running); /* The prologue part of UA_Server_run (no need to use if you call * UA_Server_run) */ UA_StatusCode UA_EXPORT UA_Server_run_startup(UA_Server *server); /* Executes a single iteration of the server's main loop. * * @param server The server object. * @param waitInternal Should we wait for messages in the networklayer? * Otherwise, the timouts for the networklayers are set to zero. * The default max wait time is 50millisec. * @return Returns how long we can wait until the next scheduled * callback (in ms) */ UA_UInt16 UA_EXPORT UA_Server_run_iterate(UA_Server *server, UA_Boolean waitInternal); /* The epilogue part of UA_Server_run (no need to use if you call * UA_Server_run) */ UA_StatusCode UA_EXPORT UA_Server_run_shutdown(UA_Server *server); /** * Repeated Callbacks * ------------------ */ typedef void (*UA_ServerCallback)(UA_Server *server, void *data); /* Add a callback for cyclic repetition to the server. * * @param server The server object. * @param callback The callback that shall be added. * @param interval The callback shall be repeatedly executed with the given interval * (in ms). The interval must be larger than 5ms. The first execution * occurs at now() + interval at the latest. * @param callbackId Set to the identifier of the repeated callback . This can be used to cancel * the callback later on. If the pointer is null, the identifier is not set. * @return Upon success, UA_STATUSCODE_GOOD is returned. * An error code otherwise. */ UA_StatusCode UA_EXPORT UA_Server_addRepeatedCallback(UA_Server *server, UA_ServerCallback callback, void *data, UA_UInt32 interval, UA_UInt64 *callbackId); UA_StatusCode UA_EXPORT UA_Server_changeRepeatedCallbackInterval(UA_Server *server, UA_UInt64 callbackId, UA_UInt32 interval); /* Remove a repeated callback. * * @param server The server object. * @param callbackId The id of the callback that shall be removed. * @return Upon success, UA_STATUSCODE_GOOD is returned. * An error code otherwise. */ UA_StatusCode UA_EXPORT UA_Server_removeRepeatedCallback(UA_Server *server, UA_UInt64 callbackId); /** * Reading and Writing Node Attributes * ----------------------------------- * The functions for reading and writing node attributes call the regular read * and write service in the background that are also used over the network. * * The following attributes cannot be read, since the local "admin" user always * has full rights. * * - UserWriteMask * - UserAccessLevel * - UserExecutable */ /* Read an attribute of a node. The specialized functions below provide a more * concise syntax. * * @param server The server object. * @param item ReadValueIds contain the NodeId of the target node, the id of the * attribute to read and (optionally) an index range to read parts * of an array only. See the section on NumericRange for the format * used for array ranges. * @param timestamps Which timestamps to return for the attribute. * @return Returns a DataValue that contains either an error code, or a variant * with the attribute value and the timestamps. */ UA_DataValue UA_EXPORT UA_Server_read(UA_Server *server, const UA_ReadValueId *item, UA_TimestampsToReturn timestamps); /* Don't use this function. There are typed versions for every supported * attribute. */ UA_StatusCode UA_EXPORT __UA_Server_read(UA_Server *server, const UA_NodeId *nodeId, UA_AttributeId attributeId, void *v); static UA_INLINE UA_StatusCode UA_Server_readNodeId(UA_Server *server, const UA_NodeId nodeId, UA_NodeId *outNodeId) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_NODEID, outNodeId); } static UA_INLINE UA_StatusCode UA_Server_readNodeClass(UA_Server *server, const UA_NodeId nodeId, UA_NodeClass *outNodeClass) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_NODECLASS, outNodeClass); } static UA_INLINE UA_StatusCode UA_Server_readBrowseName(UA_Server *server, const UA_NodeId nodeId, UA_QualifiedName *outBrowseName) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_BROWSENAME, outBrowseName); } static UA_INLINE UA_StatusCode UA_Server_readDisplayName(UA_Server *server, const UA_NodeId nodeId, UA_LocalizedText *outDisplayName) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_DISPLAYNAME, outDisplayName); } static UA_INLINE UA_StatusCode UA_Server_readDescription(UA_Server *server, const UA_NodeId nodeId, UA_LocalizedText *outDescription) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_DESCRIPTION, outDescription); } static UA_INLINE UA_StatusCode UA_Server_readWriteMask(UA_Server *server, const UA_NodeId nodeId, UA_UInt32 *outWriteMask) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_WRITEMASK, outWriteMask); } static UA_INLINE UA_StatusCode UA_Server_readIsAbstract(UA_Server *server, const UA_NodeId nodeId, UA_Boolean *outIsAbstract) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_ISABSTRACT, outIsAbstract); } static UA_INLINE UA_StatusCode UA_Server_readSymmetric(UA_Server *server, const UA_NodeId nodeId, UA_Boolean *outSymmetric) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_SYMMETRIC, outSymmetric); } static UA_INLINE UA_StatusCode UA_Server_readInverseName(UA_Server *server, const UA_NodeId nodeId, UA_LocalizedText *outInverseName) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_INVERSENAME, outInverseName); } static UA_INLINE UA_StatusCode UA_Server_readContainsNoLoop(UA_Server *server, const UA_NodeId nodeId, UA_Boolean *outContainsNoLoops) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_CONTAINSNOLOOPS, outContainsNoLoops); } static UA_INLINE UA_StatusCode UA_Server_readEventNotifier(UA_Server *server, const UA_NodeId nodeId, UA_Byte *outEventNotifier) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_EVENTNOTIFIER, outEventNotifier); } static UA_INLINE UA_StatusCode UA_Server_readValue(UA_Server *server, const UA_NodeId nodeId, UA_Variant *outValue) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_VALUE, outValue); } static UA_INLINE UA_StatusCode UA_Server_readDataType(UA_Server *server, const UA_NodeId nodeId, UA_NodeId *outDataType) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_DATATYPE, outDataType); } static UA_INLINE UA_StatusCode UA_Server_readValueRank(UA_Server *server, const UA_NodeId nodeId, UA_Int32 *outValueRank) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_VALUERANK, outValueRank); } /* Returns a variant with an int32 array */ static UA_INLINE UA_StatusCode UA_Server_readArrayDimensions(UA_Server *server, const UA_NodeId nodeId, UA_Variant *outArrayDimensions) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_ARRAYDIMENSIONS, outArrayDimensions); } static UA_INLINE UA_StatusCode UA_Server_readAccessLevel(UA_Server *server, const UA_NodeId nodeId, UA_Byte *outAccessLevel) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_ACCESSLEVEL, outAccessLevel); } static UA_INLINE UA_StatusCode UA_Server_readMinimumSamplingInterval(UA_Server *server, const UA_NodeId nodeId, UA_Double *outMinimumSamplingInterval) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_MINIMUMSAMPLINGINTERVAL, outMinimumSamplingInterval); } static UA_INLINE UA_StatusCode UA_Server_readHistorizing(UA_Server *server, const UA_NodeId nodeId, UA_Boolean *outHistorizing) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_HISTORIZING, outHistorizing); } static UA_INLINE UA_StatusCode UA_Server_readExecutable(UA_Server *server, const UA_NodeId nodeId, UA_Boolean *outExecutable) { return __UA_Server_read(server, &nodeId, UA_ATTRIBUTEID_EXECUTABLE, outExecutable); } /** * The following node attributes cannot be changed once a node has been created: * * - NodeClass * - NodeId * - Symmetric * - ContainsNoLoop * * The following attributes cannot be written from the server, as they are * specific to the different users and set by the access control callback: * * - UserWriteMask * - UserAccessLevel * - UserExecutable * * Historizing is currently unsupported */ /* Overwrite an attribute of a node. The specialized functions below provide a * more concise syntax. * * @param server The server object. * @param value WriteValues contain the NodeId of the target node, the id of the * attribute to overwritten, the actual value and (optionally) an * index range to replace parts of an array only. of an array only. * See the section on NumericRange for the format used for array * ranges. * @return Returns a status code. */ UA_StatusCode UA_EXPORT UA_Server_write(UA_Server *server, const UA_WriteValue *value); /* Don't use this function. There are typed versions with no additional * overhead. */ UA_StatusCode UA_EXPORT __UA_Server_write(UA_Server *server, const UA_NodeId *nodeId, const UA_AttributeId attributeId, const UA_DataType *attr_type, const void *attr); static UA_INLINE UA_StatusCode UA_Server_writeBrowseName(UA_Server *server, const UA_NodeId nodeId, const UA_QualifiedName browseName) { return __UA_Server_write(server, &nodeId, UA_ATTRIBUTEID_BROWSENAME, &UA_TYPES[UA_TYPES_QUALIFIEDNAME], &browseName); } static UA_INLINE UA_StatusCode UA_Server_writeDisplayName(UA_Server *server, const UA_NodeId nodeId, const UA_LocalizedText displayName) { return __UA_Server_write(server, &nodeId, UA_ATTRIBUTEID_DISPLAYNAME, &UA_TYPES[UA_TYPES_LOCALIZEDTEXT], &displayName); } static UA_INLINE UA_StatusCode UA_Server_writeDescription(UA_Server *server, const UA_NodeId nodeId, const UA_LocalizedText description) { return __UA_Server_write(server, &nodeId, UA_ATTRIBUTEID_DESCRIPTION, &UA_TYPES[UA_TYPES_LOCALIZEDTEXT], &description); } static UA_INLINE UA_StatusCode UA_Server_writeWriteMask(UA_Server *server, const UA_NodeId nodeId, const UA_UInt32 writeMask) { return __UA_Server_write(server, &nodeId, UA_ATTRIBUTEID_WRITEMASK, &UA_TYPES[UA_TYPES_UINT32], &writeMask); } static UA_INLINE UA_StatusCode UA_Server_writeIsAbstract(UA_Server *server, const UA_NodeId nodeId, const UA_Boolean isAbstract) { return __UA_Server_write(server, &nodeId, UA_ATTRIBUTEID_ISABSTRACT, &UA_TYPES[UA_TYPES_BOOLEAN], &isAbstract); } static UA_INLINE UA_StatusCode UA_Server_writeInverseName(UA_Server *server, const UA_NodeId nodeId, const UA_LocalizedText inverseName) { return __UA_Server_write(server, &nodeId, UA_ATTRIBUTEID_INVERSENAME, &UA_TYPES[UA_TYPES_LOCALIZEDTEXT], &inverseName); } static UA_INLINE UA_StatusCode UA_Server_writeEventNotifier(UA_Server *server, const UA_NodeId nodeId, const UA_Byte eventNotifier) { return __UA_Server_write(server, &nodeId, UA_ATTRIBUTEID_EVENTNOTIFIER, &UA_TYPES[UA_TYPES_BYTE], &eventNotifier); } static UA_INLINE UA_StatusCode UA_Server_writeValue(UA_Server *server, const UA_NodeId nodeId, const UA_Variant value) { return __UA_Server_write(server, &nodeId, UA_ATTRIBUTEID_VALUE, &UA_TYPES[UA_TYPES_VARIANT], &value); } static UA_INLINE UA_StatusCode UA_Server_writeDataType(UA_Server *server, const UA_NodeId nodeId, const UA_NodeId dataType) { return __UA_Server_write(server, &nodeId, UA_ATTRIBUTEID_DATATYPE, &UA_TYPES[UA_TYPES_NODEID], &dataType); } static UA_INLINE UA_StatusCode UA_Server_writeValueRank(UA_Server *server, const UA_NodeId nodeId, const UA_Int32 valueRank) { return __UA_Server_write(server, &nodeId, UA_ATTRIBUTEID_VALUERANK, &UA_TYPES[UA_TYPES_INT32], &valueRank); } static UA_INLINE UA_StatusCode UA_Server_writeArrayDimensions(UA_Server *server, const UA_NodeId nodeId, const UA_Variant arrayDimensions) { return __UA_Server_write(server, &nodeId, UA_ATTRIBUTEID_VALUE, &UA_TYPES[UA_TYPES_VARIANT], &arrayDimensions); } static UA_INLINE UA_StatusCode UA_Server_writeAccessLevel(UA_Server *server, const UA_NodeId nodeId, const UA_Byte accessLevel) { return __UA_Server_write(server, &nodeId, UA_ATTRIBUTEID_ACCESSLEVEL, &UA_TYPES[UA_TYPES_BYTE], &accessLevel); } static UA_INLINE UA_StatusCode UA_Server_writeMinimumSamplingInterval(UA_Server *server, const UA_NodeId nodeId, const UA_Double miniumSamplingInterval) { return __UA_Server_write(server, &nodeId, UA_ATTRIBUTEID_MINIMUMSAMPLINGINTERVAL, &UA_TYPES[UA_TYPES_DOUBLE], &miniumSamplingInterval); } static UA_INLINE UA_StatusCode UA_Server_writeExecutable(UA_Server *server, const UA_NodeId nodeId, const UA_Boolean executable) { return __UA_Server_write(server, &nodeId, UA_ATTRIBUTEID_EXECUTABLE, &UA_TYPES[UA_TYPES_BOOLEAN], &executable); } /** * Browsing * -------- */ UA_BrowseResult UA_EXPORT UA_Server_browse(UA_Server *server, UA_UInt32 maxrefs, const UA_BrowseDescription *descr); UA_BrowseResult UA_EXPORT UA_Server_browseNext(UA_Server *server, UA_Boolean releaseContinuationPoint, const UA_ByteString *continuationPoint); UA_BrowsePathResult UA_EXPORT UA_Server_translateBrowsePathToNodeIds(UA_Server *server, const UA_BrowsePath *browsePath); #ifndef HAVE_NODEITER_CALLBACK #define HAVE_NODEITER_CALLBACK /* Iterate over all nodes referenced by parentNodeId by calling the callback * function for each child node (in ifdef because GCC/CLANG handle include order * differently) */ typedef UA_StatusCode (*UA_NodeIteratorCallback)(UA_NodeId childId, UA_Boolean isInverse, UA_NodeId referenceTypeId, void *handle); #endif UA_StatusCode UA_EXPORT UA_Server_forEachChildNodeCall(UA_Server *server, UA_NodeId parentNodeId, UA_NodeIteratorCallback callback, void *handle); #ifdef UA_ENABLE_DISCOVERY /** * Discovery * --------- */ /* Register the given server instance at the discovery server. * This should be called periodically. * The semaphoreFilePath is optional. If the given file is deleted, * the server will automatically be unregistered. This could be * for example a pid file which is deleted if the server crashes. * * When the server shuts down you need to call unregister. * * @param server * @param discoveryServerUrl if set to NULL, the default value * 'opc.tcp://localhost:4840' will be used * @param semaphoreFilePath optional parameter pointing to semaphore file. */ UA_StatusCode UA_EXPORT UA_Server_register_discovery(UA_Server *server, const char* discoveryServerUrl, const char* semaphoreFilePath); /* Unregister the given server instance from the discovery server. * This should only be called when the server is shutting down. * @param server * @param discoveryServerUrl if set to NULL, the default value * 'opc.tcp://localhost:4840' will be used */ UA_StatusCode UA_EXPORT UA_Server_unregister_discovery(UA_Server *server, const char* discoveryServerUrl); /* Adds a periodic callback to register the server with the LDS (local discovery server) * periodically. The interval between each register call is given as second parameter. * It should be 10 minutes by default (= 10*60*1000). * * The delayFirstRegisterMs parameter indicates the delay for the first register call. * If it is 0, the first register call will be after intervalMs milliseconds, * otherwise the server's first register will be after delayFirstRegisterMs. * * When you manually unregister the server, you also need to cancel the * periodic callback, otherwise it will be automatically be registered again. * * If you call this method multiple times for the same discoveryServerUrl, the older * periodic callback will be removed. * * @param server * @param discoveryServerUrl if set to NULL, the default value * 'opc.tcp://localhost:4840' will be used * @param intervalMs * @param delayFirstRegisterMs * @param periodicCallbackId */ UA_StatusCode UA_EXPORT UA_Server_addPeriodicServerRegisterCallback(UA_Server *server, const char* discoveryServerUrl, UA_UInt32 intervalMs, UA_UInt32 delayFirstRegisterMs, UA_UInt64 *periodicCallbackId); /* Callback for RegisterServer. Data is passed from the register call */ typedef void (*UA_Server_registerServerCallback)(const UA_RegisteredServer *registeredServer, void* data); /* Set the callback which is called if another server registeres or unregisters * with this instance. If called multiple times, previous data will be * overwritten. * * @param server * @param cb the callback * @param data data passed to the callback * @return UA_STATUSCODE_SUCCESS on success */ void UA_EXPORT UA_Server_setRegisterServerCallback(UA_Server *server, UA_Server_registerServerCallback cb, void* data); #ifdef UA_ENABLE_DISCOVERY_MULTICAST /* Callback for server detected through mDNS. Data is passed from the register * call * * @param isServerAnnounce indicates if the server has just been detected. If * set to false, this means the server is shutting down. * @param isTxtReceived indicates if we already received the corresponding TXT * record with the path and caps data */ typedef void (*UA_Server_serverOnNetworkCallback)(const UA_ServerOnNetwork *serverOnNetwork, UA_Boolean isServerAnnounce, UA_Boolean isTxtReceived, void* data); /* Set the callback which is called if another server is found through mDNS or * deleted. It will be called for any mDNS message from the remote server, thus * it may be called multiple times for the same instance. Also the SRV and TXT * records may arrive later, therefore for the first call the server * capabilities may not be set yet. If called multiple times, previous data will * be overwritten. * * @param server * @param cb the callback * @param data data passed to the callback * @return UA_STATUSCODE_SUCCESS on success */ void UA_EXPORT UA_Server_setServerOnNetworkCallback(UA_Server *server, UA_Server_serverOnNetworkCallback cb, void* data); #endif /* UA_ENABLE_DISCOVERY_MULTICAST */ #endif /* UA_ENABLE_DISCOVERY */ /** * Information Model Callbacks * --------------------------- * * There are three places where a callback from an information model to * user-defined code can happen. * * - Custom node constructors and destructors * - Linking VariableNodes with an external data source * - MethodNode callbacks * * .. _node-lifecycle: * * Node Lifecycle: Constructors, Destructors and Node Contexts * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ * * To finalize the instantiation of a node, a (user-defined) constructor * callback is executed. There can be both a global constructor for all nodes * and node-type constructor specific to the TypeDefinition of the new node * (attached to an ObjectTypeNode or VariableTypeNode). * * In the hierarchy of ObjectTypes and VariableTypes, only the constructor of * the (lowest) type defined for the new node is executed. Note that every * Object and Variable can have only one ``isTypeOf`` reference. But type-nodes * can technically have several ``hasSubType`` references to implement multiple * inheritance. Issues of (multiple) inheritance in the constructor need to be * solved by the user. * * When a node is destroyed, the node-type destructor is called before the * global destructor. So the overall node lifecycle is as follows: * * 1. Global Constructor (set in the server config) * 2. Node-Type Constructor (for VariableType or ObjectTypes) * 3. (Usage-period of the Node) * 4. Node-Type Destructor * 5. Global Destructor * * The constructor and destructor callbacks can be set to ``NULL`` and are not * used in that case. If the node-type constructor fails, the global destructor * will be called before removing the node. The destructors are assumed to never * fail. * * Every node carries a user-context and a constructor-context pointer. The * user-context is used to attach custom data to a node. But the (user-defined) * constructors and destructors may replace the user-context pointer if they * wish to do so. The initial value for the constructor-context is ``NULL``. * When the ``AddNodes`` service is used over the network, the user-context * pointer of the new node is also initially set to ``NULL``. */ /* To be set in the server config. */ typedef struct { /* Can be NULL. May replace the nodeContext */ UA_StatusCode (*constructor)(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext, const UA_NodeId *nodeId, void **nodeContext); /* Can be NULL. The context cannot be replaced since the node is destroyed * immediately afterwards anyway. */ void (*destructor)(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext, const UA_NodeId *nodeId, void *nodeContext); } UA_GlobalNodeLifecycle; typedef struct { /* Can be NULL. May replace the nodeContext */ UA_StatusCode (*constructor)(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext, const UA_NodeId *typeNodeId, void *typeNodeContext, const UA_NodeId *nodeId, void **nodeContext); /* Can be NULL. May replace the nodeContext. */ void (*destructor)(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext, const UA_NodeId *typeNodeId, void *typeNodeContext, const UA_NodeId *nodeId, void **nodeContext); } UA_NodeTypeLifecycle; UA_StatusCode UA_EXPORT UA_Server_setNodeTypeLifecycle(UA_Server *server, UA_NodeId nodeId, UA_NodeTypeLifecycle lifecycle); UA_StatusCode UA_EXPORT UA_Server_getNodeContext(UA_Server *server, UA_NodeId nodeId, void **nodeContext); /* Careful! The user has to ensure that the destructor callbacks still work. */ UA_StatusCode UA_EXPORT UA_Server_setNodeContext(UA_Server *server, UA_NodeId nodeId, void *nodeContext); /** * .. _datasource: * * Data Source Callback * ^^^^^^^^^^^^^^^^^^^^ * * The server has a unique way of dealing with the content of variables. Instead * of storing a variant attached to the variable node, the node can point to a * function with a local data provider. Whenever the value attribute is read, * the function will be called and asked to provide a UA_DataValue return value * that contains the value content and additional timestamps. * * It is expected that the read callback is implemented. The write callback can * be set to a null-pointer. */ typedef struct { /* Copies the data from the source into the provided value. * * !! ZERO-COPY OPERATIONS POSSIBLE !! * It is not required to return a copy of the actual content data. You can * return a pointer to memory owned by the user. Memory can be reused * between read callbacks of a DataSource, as the result is already encoded * on the network buffer between each read operation. * * To use zero-copy reads, set the value of the `value->value` Variant * without copying, e.g. with `UA_Variant_setScalar`. Then, also set * `value->value.storageType` to `UA_VARIANT_DATA_NODELETE` to prevent the * memory being cleaned up. Don't forget to also set `value->hasValue` to * true to indicate the presence of a value. * * @param handle An optional pointer to user-defined data for the * specific data source * @param nodeid Id of the read node * @param includeSourceTimeStamp If true, then the datasource is expected to * set the source timestamp in the returned value * @param range If not null, then the datasource shall return only a * selection of the (nonscalar) data. Set * UA_STATUSCODE_BADINDEXRANGEINVALID in the value if this does not * apply. * @param value The (non-null) DataValue that is returned to the client. The * data source sets the read data, the result status and optionally a * sourcetimestamp. * @return Returns a status code for logging. Error codes intended for the * original caller are set in the value. If an error is returned, * then no releasing of the value is done. */ UA_StatusCode (*read)(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext, const UA_NodeId *nodeId, void *nodeContext, UA_Boolean includeSourceTimeStamp, const UA_NumericRange *range, UA_DataValue *value); /* Write into a data source. This method pointer can be NULL if the * operation is unsupported. * * @param handle An optional pointer to user-defined data for the * specific data source * @param nodeid Id of the node being written to * @param data The data to be written into the data source * @param range An optional data range. If the data source is scalar or does * not support writing of ranges, then an error code is returned. * @return Returns a status code that is returned to the user */ UA_StatusCode (*write)(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext, const UA_NodeId *nodeId, void *nodeContext, const UA_NumericRange *range, const UA_DataValue *value); } UA_DataSource; UA_StatusCode UA_EXPORT UA_Server_setVariableNode_dataSource(UA_Server *server, const UA_NodeId nodeId, const UA_DataSource dataSource); /** * .. _value-callback: * * Value Callback * ^^^^^^^^^^^^^^ * Value Callbacks can be attached to variable and variable type nodes. If * not ``NULL``, they are called before reading and after writing respectively. */ typedef struct { /* Called before the value attribute is read. It is possible to write into the * value attribute during onRead (using the write service). The node is * re-opened afterwards so that changes are considered in the following read * operation. * * @param handle Points to user-provided data for the callback. * @param nodeid The identifier of the node. * @param data Points to the current node value. * @param range Points to the numeric range the client wants to read from * (or NULL). */ void (*onRead)(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext, const UA_NodeId *nodeid, void *nodeContext, const UA_NumericRange *range, const UA_DataValue *value); /* Called after writing the value attribute. The node is re-opened after * writing so that the new value is visible in the callback. * * @param server The server executing the callback * @sessionId The identifier of the session * @sessionContext Additional data attached to the session * in the access control layer * @param nodeid The identifier of the node. * @param nodeUserContext Additional data attached to the node by * the user. * @param nodeConstructorContext Additional data attached to the node * by the type constructor(s). * @param range Points to the numeric range the client wants to write to (or * NULL). */ void (*onWrite)(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext, const UA_NodeId *nodeId, void *nodeContext, const UA_NumericRange *range, const UA_DataValue *data); } UA_ValueCallback; UA_StatusCode UA_EXPORT UA_Server_setVariableNode_valueCallback(UA_Server *server, const UA_NodeId nodeId, const UA_ValueCallback callback); /** * Method Callbacks * ^^^^^^^^^^^^^^^^ * Method callbacks are set to `NULL` (not executable) when a method node is added * over the network. In theory, it is possible to add a callback via * ``UA_Server_setMethodNode_callback`` within the global constructor when adding * methods over the network is really wanted. */ typedef UA_StatusCode (*UA_MethodCallback)(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext, const UA_NodeId *methodId, void *methodContext, const UA_NodeId *objectId, void *objectContext, size_t inputSize, const UA_Variant *input, size_t outputSize, UA_Variant *output); #ifdef UA_ENABLE_METHODCALLS UA_StatusCode UA_EXPORT UA_Server_setMethodNode_callback(UA_Server *server, const UA_NodeId methodNodeId, UA_MethodCallback methodCallback); UA_CallMethodResult UA_EXPORT UA_Server_call(UA_Server *server, const UA_CallMethodRequest *request); #endif /** * .. _addnodes: * * Node Addition and Deletion * -------------------------- * When creating dynamic node instances at runtime, chances are that you will * not care about the specific NodeId of the new node, as long as you can * reference it later. When passing numeric NodeIds with a numeric identifier 0, * the stack evaluates this as "select a random unassigned numeric NodeId in * that namespace". To find out which NodeId was actually assigned to the new * node, you may pass a pointer `outNewNodeId`, which will (after a successful * node insertion) contain the nodeId of the new node. You may also pass a * ``NULL`` pointer if this result is not needed. * * See the Section :ref:`node-lifecycle` on constructors and on attaching * user-defined data to nodes. * * The methods for node addition and deletion take mostly const arguments that * are not modified. When creating a node, a deep copy of the node identifier, * node attributes, etc. is created. Therefore, it is possible to call for * example ``UA_Server_addVariablenode`` with a value attribute (a * :ref:`variant`) pointing to a memory location on the stack. If you need * changes to a variable value to manifest at a specific memory location, please * use a :ref:`datasource` or a :ref:`value-callback`. */ /* Protect against redundant definitions for server/client */ #ifndef UA_DEFAULT_ATTRIBUTES_DEFINED #define UA_DEFAULT_ATTRIBUTES_DEFINED /* The default for variables is "BaseDataType" for the datatype, -2 for the * valuerank and a read-accesslevel. */ UA_EXPORT extern const UA_VariableAttributes UA_VariableAttributes_default; UA_EXPORT extern const UA_VariableTypeAttributes UA_VariableTypeAttributes_default; /* Methods are executable by default */ UA_EXPORT extern const UA_MethodAttributes UA_MethodAttributes_default; /* The remaining attribute definitions are currently all zeroed out */ UA_EXPORT extern const UA_ObjectAttributes UA_ObjectAttributes_default; UA_EXPORT extern const UA_ObjectTypeAttributes UA_ObjectTypeAttributes_default; UA_EXPORT extern const UA_ReferenceTypeAttributes UA_ReferenceTypeAttributes_default; UA_EXPORT extern const UA_DataTypeAttributes UA_DataTypeAttributes_default; UA_EXPORT extern const UA_ViewAttributes UA_ViewAttributes_default; #endif /* Don't use this function. There are typed versions as inline functions. */ UA_StatusCode UA_EXPORT __UA_Server_addNode(UA_Server *server, const UA_NodeClass nodeClass, const UA_NodeId *requestedNewNodeId, const UA_NodeId *parentNodeId, const UA_NodeId *referenceTypeId, const UA_QualifiedName browseName, const UA_NodeId *typeDefinition, const UA_NodeAttributes *attr, const UA_DataType *attributeType, void *nodeContext, UA_NodeId *outNewNodeId); static UA_INLINE UA_StatusCode UA_Server_addVariableNode(UA_Server *server, const UA_NodeId requestedNewNodeId, const UA_NodeId parentNodeId, const UA_NodeId referenceTypeId, const UA_QualifiedName browseName, const UA_NodeId typeDefinition, const UA_VariableAttributes attr, void *nodeContext, UA_NodeId *outNewNodeId) { return __UA_Server_addNode(server, UA_NODECLASS_VARIABLE, &requestedNewNodeId, &parentNodeId, &referenceTypeId, browseName, &typeDefinition, (const UA_NodeAttributes*)&attr, &UA_TYPES[UA_TYPES_VARIABLEATTRIBUTES], nodeContext, outNewNodeId); } static UA_INLINE UA_StatusCode UA_Server_addVariableTypeNode(UA_Server *server, const UA_NodeId requestedNewNodeId, const UA_NodeId parentNodeId, const UA_NodeId referenceTypeId, const UA_QualifiedName browseName, const UA_NodeId typeDefinition, const UA_VariableTypeAttributes attr, void *nodeContext, UA_NodeId *outNewNodeId) { return __UA_Server_addNode(server, UA_NODECLASS_VARIABLETYPE, &requestedNewNodeId, &parentNodeId, &referenceTypeId, browseName, &typeDefinition, (const UA_NodeAttributes*)&attr, &UA_TYPES[UA_TYPES_VARIABLETYPEATTRIBUTES], nodeContext, outNewNodeId); } static UA_INLINE UA_StatusCode UA_Server_addObjectNode(UA_Server *server, const UA_NodeId requestedNewNodeId, const UA_NodeId parentNodeId, const UA_NodeId referenceTypeId, const UA_QualifiedName browseName, const UA_NodeId typeDefinition, const UA_ObjectAttributes attr, void *nodeContext, UA_NodeId *outNewNodeId) { return __UA_Server_addNode(server, UA_NODECLASS_OBJECT, &requestedNewNodeId, &parentNodeId, &referenceTypeId, browseName, &typeDefinition, (const UA_NodeAttributes*)&attr, &UA_TYPES[UA_TYPES_OBJECTATTRIBUTES], nodeContext, outNewNodeId); } static UA_INLINE UA_StatusCode UA_Server_addObjectTypeNode(UA_Server *server, const UA_NodeId requestedNewNodeId, const UA_NodeId parentNodeId, const UA_NodeId referenceTypeId, const UA_QualifiedName browseName, const UA_ObjectTypeAttributes attr, void *nodeContext, UA_NodeId *outNewNodeId) { return __UA_Server_addNode(server, UA_NODECLASS_OBJECTTYPE, &requestedNewNodeId, &parentNodeId, &referenceTypeId, browseName, &UA_NODEID_NULL, (const UA_NodeAttributes*)&attr, &UA_TYPES[UA_TYPES_OBJECTTYPEATTRIBUTES], nodeContext, outNewNodeId); } static UA_INLINE UA_StatusCode UA_Server_addViewNode(UA_Server *server, const UA_NodeId requestedNewNodeId, const UA_NodeId parentNodeId, const UA_NodeId referenceTypeId, const UA_QualifiedName browseName, const UA_ViewAttributes attr, void *nodeContext, UA_NodeId *outNewNodeId) { return __UA_Server_addNode(server, UA_NODECLASS_VIEW, &requestedNewNodeId, &parentNodeId, &referenceTypeId, browseName, &UA_NODEID_NULL, (const UA_NodeAttributes*)&attr, &UA_TYPES[UA_TYPES_VIEWATTRIBUTES], nodeContext, outNewNodeId); } static UA_INLINE UA_StatusCode UA_Server_addReferenceTypeNode(UA_Server *server, const UA_NodeId requestedNewNodeId, const UA_NodeId parentNodeId, const UA_NodeId referenceTypeId, const UA_QualifiedName browseName, const UA_ReferenceTypeAttributes attr, void *nodeContext, UA_NodeId *outNewNodeId) { return __UA_Server_addNode(server, UA_NODECLASS_REFERENCETYPE, &requestedNewNodeId, &parentNodeId, &referenceTypeId, browseName, &UA_NODEID_NULL, (const UA_NodeAttributes*)&attr, &UA_TYPES[UA_TYPES_REFERENCETYPEATTRIBUTES], nodeContext, outNewNodeId); } static UA_INLINE UA_StatusCode UA_Server_addDataTypeNode(UA_Server *server, const UA_NodeId requestedNewNodeId, const UA_NodeId parentNodeId, const UA_NodeId referenceTypeId, const UA_QualifiedName browseName, const UA_DataTypeAttributes attr, void *nodeContext, UA_NodeId *outNewNodeId) { return __UA_Server_addNode(server, UA_NODECLASS_DATATYPE, &requestedNewNodeId, &parentNodeId, &referenceTypeId, browseName, &UA_NODEID_NULL, (const UA_NodeAttributes*)&attr, &UA_TYPES[UA_TYPES_DATATYPEATTRIBUTES], nodeContext, outNewNodeId); } UA_StatusCode UA_EXPORT UA_Server_addDataSourceVariableNode(UA_Server *server, const UA_NodeId requestedNewNodeId, const UA_NodeId parentNodeId, const UA_NodeId referenceTypeId, const UA_QualifiedName browseName, const UA_NodeId typeDefinition, const UA_VariableAttributes attr, const UA_DataSource dataSource, void *nodeContext, UA_NodeId *outNewNodeId); UA_StatusCode UA_EXPORT UA_Server_addMethodNode(UA_Server *server, const UA_NodeId requestedNewNodeId, const UA_NodeId parentNodeId, const UA_NodeId referenceTypeId, const UA_QualifiedName browseName, const UA_MethodAttributes attr, UA_MethodCallback method, size_t inputArgumentsSize, const UA_Argument* inputArguments, size_t outputArgumentsSize, const UA_Argument* outputArguments, void *nodeContext, UA_NodeId *outNewNodeId); /** * The method pair UA_Server_addNode_begin and _finish splits the AddNodes * service in two parts. This is useful if the node shall be modified before * finish the instantiation. For example to add children with specific NodeIds. * Otherwise, mandatory children (e.g. of an ObjectType) are added with * pseudo-random unique NodeIds. Existing children are detected during the * _finish part via their matching BrowseName. * * The _begin method prepares the node and adds it to the nodestore. It may copy * some unassigned attributes from the TypeDefinition node internally. The * _finish method adds the references to the parent (and the TypeDefinition if * applicable), copies mandatory children, performs type-checking of variables * and calls the node constructor(s) at the end. The _finish method may remove * the node if it encounters an error. */ /* The ``attr`` argument must have a type according to the NodeClass. * ``VariableAttributes`` for variables, ``ObjectAttributes`` for objects, and * so on. Missing attributes are taken from the TypeDefinition node if * applicable. */ UA_StatusCode UA_EXPORT UA_Server_addNode_begin(UA_Server *server, const UA_NodeClass nodeClass, const UA_NodeId requestedNewNodeId, const UA_QualifiedName browseName, const UA_NodeId typeDefinition, const void *attr, const UA_DataType *attributeType, void *nodeContext, UA_NodeId *outNewNodeId); UA_StatusCode UA_EXPORT UA_Server_addNode_finish(UA_Server *server, const UA_NodeId nodeId, const UA_NodeId parentNodeId, const UA_NodeId referenceTypeId, const UA_NodeId typeDefinitionId); /* Deletes a node and optionally all references leading to the node. */ UA_StatusCode UA_EXPORT UA_Server_deleteNode(UA_Server *server, const UA_NodeId nodeId, UA_Boolean deleteReferences); /** * Reference Management * -------------------- */ UA_StatusCode UA_EXPORT UA_Server_addReference(UA_Server *server, const UA_NodeId sourceId, const UA_NodeId refTypeId, const UA_ExpandedNodeId targetId, UA_Boolean isForward); UA_StatusCode UA_EXPORT UA_Server_deleteReference(UA_Server *server, const UA_NodeId sourceNodeId, const UA_NodeId referenceTypeId, UA_Boolean isForward, const UA_ExpandedNodeId targetNodeId, UA_Boolean deleteBidirectional); /** * Utility Functions * ----------------- */ /* Add a new namespace to the server. Returns the index of the new namespace */ UA_UInt16 UA_EXPORT UA_Server_addNamespace(UA_Server *server, const char* name); /** * Deprecated Server API * --------------------- * This file contains outdated API definitions that are kept for backwards * compatibility. Please switch to the new API, as the following definitions * will be removed eventually. * * UA_Job API * ^^^^^^^^^^ * UA_Job was replaced since it unnecessarily exposed server internals to the * end-user. Please use plain UA_ServerCallbacks instead. The following UA_Job * definition contains just the fraction of the original struct that was useful * to end-users. */ typedef enum { UA_JOBTYPE_METHODCALL } UA_JobType; typedef struct { UA_JobType type; union { struct { void *data; UA_ServerCallback method; } methodCall; } job; } UA_Job; UA_DEPRECATED static UA_INLINE UA_StatusCode UA_Server_addRepeatedJob(UA_Server *server, UA_Job job, UA_UInt32 interval, UA_Guid *jobId) { return UA_Server_addRepeatedCallback(server, job.job.methodCall.method, job.job.methodCall.data, interval, (UA_UInt64*)(uintptr_t)jobId); } UA_DEPRECATED static UA_INLINE UA_StatusCode UA_Server_removeRepeatedJob(UA_Server *server, UA_Guid jobId) { return UA_Server_removeRepeatedCallback(server, *(UA_UInt64*)(uintptr_t)&jobId); } #ifdef __cplusplus } #endif #endif /* UA_SERVER_H_ */