/*
* Copyright (C) 2014 the contributors as stated in the AUTHORS file
*
* This file is part of open62541. open62541 is free software: you can
* redistribute it and/or modify it under the terms of the GNU Lesser General
* Public License, version 3 (as published by the Free Software Foundation) with
* a static linking exception as stated in the LICENSE file provided with
* open62541.
*
* open62541 is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*/
#ifndef UA_SERVER_H_
#define UA_SERVER_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "ua_types.h"
#include "ua_types_generated.h"
#include "ua_nodeids.h"
#include "ua_connection.h"
#include "ua_log.h"
/**
* @defgroup server Server
*
* @{
*/
struct UA_Server;
typedef struct UA_Server UA_Server;
UA_Server UA_EXPORT * UA_Server_new(void);
void UA_EXPORT UA_Server_setServerCertificate(UA_Server *server, UA_ByteString certificate);
void UA_EXPORT UA_Server_delete(UA_Server *server);
/** Sets the logger used by the server */
void UA_EXPORT UA_Server_setLogger(UA_Server *server, UA_Logger logger);
/**
* Runs the main loop of the server. In each iteration, this calls into the
* networklayers to see if work have arrived and checks if timed events need to
* be triggered.
*
* @param server The server object
* @param nThreads The number of worker threads. Is ignored if MULTITHREADING is
* not activated.
* @param running Points to a booloean value on the heap. When running is set to
* false, the worker threads and the main loop close and the server is shut
* down.
* @return Indicates whether the server shut down cleanly
*
*/
UA_StatusCode UA_EXPORT UA_Server_run(UA_Server *server, UA_UInt16 nThreads, UA_Boolean *running);
/** @brief A datasource is the interface to interact with a local data provider.
*
* Implementors of datasources need to provide functions for the callbacks in
* this structure. After every read, the handle needs to be released to indicate
* that the pointer is no longer accessed. As a rule, datasources are never
* copied, but only their content. The only way to write into a datasource is
* via the write-service.
*
* It is expected that the read and release callbacks are implemented. The write
* callback can be set to null.
**/
typedef struct {
const void *handle;
UA_StatusCode (*read)(const void *handle, UA_Boolean sourceTimeStamp, UA_DataValue *value);
void (*release)(const void *handle, UA_DataValue *value);
UA_StatusCode (*write)(const void *handle, const UA_Variant *data);
} UA_DataSource;
/** Add a reference to the server's address space */
UA_StatusCode UA_EXPORT UA_Server_addReference(UA_Server *server, const UA_AddReferencesItem *item);
UA_StatusCode UA_EXPORT
UA_Server_addVariableNode(UA_Server *server, UA_Variant *value, const UA_QualifiedName browseName,
UA_NodeId nodeId, const UA_NodeId parentNodeId, const UA_NodeId referenceTypeId);
UA_StatusCode UA_EXPORT
UA_Server_addDataSourceVariableNode(UA_Server *server, UA_DataSource dataSource,
const UA_QualifiedName browseName, UA_NodeId nodeId,
const UA_NodeId parentNodeId, const UA_NodeId referenceTypeId);
/** Work that is run in the main loop (singlethreaded) or dispatched to a worker
thread. */
typedef struct UA_WorkItem {
enum {
UA_WORKITEMTYPE_NOTHING,
UA_WORKITEMTYPE_BINARYNETWORKMESSAGE,
UA_WORKITEMTYPE_METHODCALL,
UA_WORKITEMTYPE_DELAYEDMETHODCALL,
} type;
union {
struct {
UA_Connection *connection;
UA_ByteString message;
} binaryNetworkMessage;
struct {
void * data;
void (*method)(UA_Server *server, void *data);
} methodCall;
} work;
} UA_WorkItem;
/**
* @param server The server object.
*
* @param work Pointer to the WorkItem that shall be added. The pointer is not
* freed but copied to an internal representation.
*
* @param executionTime The time when the work shall be executed. If the time lies in the
* past, the work will be executed in the next iteration of the server's
* main loop
*
* @param resultWorkGuid Upon success, the pointed value is set to the guid of
* the workitem in the server queue. This can be used to cancel the work
* later on. If the pointer is null, the guid is not set.
*
* @return Upon sucess, UA_STATUSCODE_GOOD is returned. An error code otherwise.
*/
UA_StatusCode UA_EXPORT UA_Server_addTimedWorkItem(UA_Server *server, const UA_WorkItem *work,
UA_DateTime executionTime, UA_Guid *resultWorkGuid);
/**
* @param server The server object.
*
* @param work Pointer to the WorkItem that shall be added. The pointer is not
* freed but copied to an internal representation.
*
* @param interval The work that is executed repeatedly with the given interval
* (in 100ns). If work with the same repetition interval already exists,
* the first execution might occur sooner.
*
* @param resultWorkGuid Upon success, the pointed value is set to the guid of
* the workitem in the server queue. This can be used to cancel the work
* later on. If the pointer is null, the guid is not set.
*
* @return Upon sucess, UA_STATUSCODE_GOOD is returned. An error code otherwise.
*/
UA_StatusCode UA_EXPORT UA_Server_addRepeatedWorkItem(UA_Server *server, const UA_WorkItem *work,
UA_UInt32 interval, UA_Guid *resultWorkGuid);
/** Remove timed or repeated work */
/* UA_Boolean UA_EXPORT UA_Server_removeWorkItem(UA_Server *server, UA_Guid workId); */
/**
* Interface to the binary network layers. This structure is returned from the
* function that initializes the network layer. The layer is already bound to a
* specific port and listening. The functions in the structure are never called
* in parallel but only sequentially from the server's main loop. So the network
* layer does not need to be thread-safe.
*/
typedef struct {
void *nlHandle;
/**
* Starts listening on the the networklayer.
*
* @return Returns UA_STATUSCODE_GOOD or an error code.
*/
UA_StatusCode (*start)(void *nlHandle, UA_Logger *logger);
/**
* Gets called from the main server loop and returns the work that
* accumulated (messages and close events) for dispatch. The networklayer
* does not wait on connections but returns immediately the work that
* accumulated.
*
* @param workItems When the returned integer is positive, *workItems points
* to an array of WorkItems of the returned size.
* @param timeout The timeout during which an event must arrive.
* @return The size of the returned workItems array. If the result is
* negative, an error has occured.
*/
UA_Int32 (*getWork)(void *nlhandle, UA_WorkItem **workItems, UA_UInt16 timeout);
/**
* Closes the network connection and returns all the work that needs to
* be finished before the network layer can be safely deleted.
*
* @param workItems When the returned integer is positive, *workItems points
* to an array of WorkItems of the returned size.
* @return The size of the returned workItems array. If the result is
* negative, an error has occured.
*/
UA_Int32 (*stop)(void *nlhandle, UA_WorkItem **workItems);
/** Deletes the network layer. Call only after a successful shutdown. */
void (*free)(void *nlhandle);
/**
* String containing the discovery URL that will be add to the server's list
* contains the protocol the host and the port of the layer
*/
UA_String* discoveryUrl;
} UA_ServerNetworkLayer;
/**
* Adds a network layer to the server. The network layer is destroyed together
* with the server. Do not use it after adding it as it might be moved around on
* the heap.
*/
void UA_EXPORT UA_Server_addNetworkLayer(UA_Server *server, UA_ServerNetworkLayer networkLayer);
/** @} */
/**
* @ingroup nodestore
*
* @defgroup external_nodestore External Nodestore
*
* @brief An external application that manages its own data and data model
*
* To plug in outside data sources, one can use
*
* - VariableNodes with a data source (functions that are called for read and write access)
* - An external nodestore that is mapped to specific namespaces
*
* If no external nodestore is defined for a nodeid, it is always looked up in
* the "local" nodestore of open62541. Namespace Zero is always in the local
* nodestore.
*
* @{
*/
typedef UA_Int32 (*UA_ExternalNodeStore_addNodes)
(void *ensHandle, const UA_RequestHeader *requestHeader, UA_AddNodesItem *nodesToAdd, UA_UInt32 *indices,
UA_UInt32 indicesSize, UA_AddNodesResult* addNodesResults, UA_DiagnosticInfo *diagnosticInfos);
typedef UA_Int32 (*UA_ExternalNodeStore_addReferences)
(void *ensHandle, const UA_RequestHeader *requestHeader, UA_AddReferencesItem* referencesToAdd,
UA_UInt32 *indices,UA_UInt32 indicesSize, UA_StatusCode *addReferencesResults,
UA_DiagnosticInfo *diagnosticInfos);
typedef UA_Int32 (*UA_ExternalNodeStore_deleteNodes)
(void *ensHandle, const UA_RequestHeader *requestHeader, UA_DeleteNodesItem *nodesToDelete, UA_UInt32 *indices,
UA_UInt32 indicesSize, UA_StatusCode *deleteNodesResults, UA_DiagnosticInfo *diagnosticInfos);
typedef UA_Int32 (*UA_ExternalNodeStore_deleteReferences)
(void *ensHandle, const UA_RequestHeader *requestHeader, UA_DeleteReferencesItem *referenceToDelete,
UA_UInt32 *indices, UA_UInt32 indicesSize, UA_StatusCode deleteReferencesresults,
UA_DiagnosticInfo *diagnosticInfos);
typedef UA_Int32 (*UA_ExternalNodeStore_readNodes)
(void *ensHandle, const UA_RequestHeader *requestHeader, UA_ReadValueId *readValueIds, UA_UInt32 *indices,
UA_UInt32 indicesSize,UA_DataValue *readNodesResults, UA_Boolean timeStampToReturn,
UA_DiagnosticInfo *diagnosticInfos);
typedef UA_Int32 (*UA_ExternalNodeStore_writeNodes)
(void *ensHandle, const UA_RequestHeader *requestHeader, UA_WriteValue *writeValues, UA_UInt32 *indices,
UA_UInt32 indicesSize, UA_StatusCode *writeNodesResults, UA_DiagnosticInfo *diagnosticInfo);
typedef UA_Int32 (*UA_ExternalNodeStore_browseNodes)
(void *ensHandle, const UA_RequestHeader *requestHeader, UA_BrowseDescription *browseDescriptions,
UA_UInt32 *indices, UA_UInt32 indicesSize, UA_UInt32 requestedMaxReferencesPerNode,
UA_BrowseResult *browseResults, UA_DiagnosticInfo *diagnosticInfos);
typedef UA_Int32 (*UA_ExternalNodeStore_delete)(void *ensHandle);
typedef struct UA_ExternalNodeStore {
void *ensHandle;
UA_ExternalNodeStore_addNodes addNodes;
UA_ExternalNodeStore_deleteNodes deleteNodes;
UA_ExternalNodeStore_writeNodes writeNodes;
UA_ExternalNodeStore_readNodes readNodes;
UA_ExternalNodeStore_browseNodes browseNodes;
UA_ExternalNodeStore_addReferences addReferences;
UA_ExternalNodeStore_deleteReferences deleteReferences;
UA_ExternalNodeStore_delete destroy;
} UA_ExternalNodeStore;
/* UA_StatusCode UA_EXPORT */
/* UA_Server_addExternalNamespace(UA_Server *server, UA_UInt16 namespaceIndex, const UA_String *url, UA_ExternalNodeStore *nodeStore); */
/** @} */
#ifdef __cplusplus
} // extern "C"
#endif
#endif /* UA_SERVER_H_ */