"use strict";
/**
* @module opcua.address_space
*/
var assert = require("node-opcua-assert");
var util = require("util");
var _ = require("underscore");
var utils = require("node-opcua-utils");
var NodeClass = require("node-opcua-data-model").NodeClass;
var AttributeIds = require("node-opcua-data-model").AttributeIds;
var extractRange = require("node-opcua-data-value").extractRange
var is_valid_dataEncoding = require("node-opcua-data-model").is_valid_dataEncoding;
var is_dataEncoding = require("node-opcua-data-model").is_dataEncoding;
var AccessLevelFlag = require("node-opcua-data-model").AccessLevelFlag;
var makeAccessLevel = require("node-opcua-data-model").makeAccessLevel;
var NodeId = require("node-opcua-nodeid").NodeId;
var DataValue = require("node-opcua-data-value").DataValue;
var sameDataValue = require("node-opcua-data-value").sameDataValue;
var Variant = require("node-opcua-variant").Variant;
var DataType = require("node-opcua-variant").DataType;
var VariantArrayType = require("node-opcua-variant").VariantArrayType;
var NumericRange = require("node-opcua-numeric-range").NumericRange;
var StatusCodes = require("node-opcua-status-code").StatusCodes;
var write_service = require("node-opcua-service-write");
var WriteValue = write_service.WriteValue;
var getCurrentClock = require("node-opcua-date-time").getCurrentClock;
var coerceClock = require("node-opcua-date-time").coerceClock;
var findBuiltInType = require("node-opcua-factory").findBuiltInType;
var BaseNode = require("./base_node").BaseNode;
var SessionContext = require("./session_context").SessionContext;
var debug = require("node-opcua-debug");
var debugLog = debug.make_debugLog(__filename);
var doDebug = debug.checkDebugFlag(__filename);
function isGoodish(statusCode) {
return statusCode.value < 0x10000000;
}
function adjust_accessLevel(accessLevel) {
accessLevel = utils.isNullOrUndefined(accessLevel) ? "CurrentRead | CurrentWrite" : accessLevel;
accessLevel = makeAccessLevel(accessLevel);
assert(_.isFinite(accessLevel.value));
return accessLevel;
}
function adjust_userAccessLevel(accessLevel) {
accessLevel = utils.isNullOrUndefined(accessLevel) ? "CurrentRead | CurrentWrite" : accessLevel;
accessLevel = makeAccessLevel(accessLevel);
return accessLevel;
}
function adjust_samplingInterval(minimumSamplingInterval) {
assert(_.isFinite(minimumSamplingInterval));
return minimumSamplingInterval;
}
function is_Variant(v) {
return v instanceof Variant;
}
function is_StatusCode(v) {
return v && v.constructor &&
(
v.constructor.name === "ConstantStatusCode" ||
v.constructor.name === "StatusCode" ||
v.constructor.name === "ModifiableStatusCode"
);
}
function is_Variant_or_StatusCode(v) {
if (is_Variant(v)) {
// /@@assert(v.isValid());
}
return is_Variant(v) || is_StatusCode(v);
}
var UADataType = require("./ua_data_type").UADataType;
function _dataType_toUADataType(addressSpace, dataType) {
assert(addressSpace);
assert(dataType && dataType.hasOwnProperty("key"));
var dataTypeNode = addressSpace.findDataType(dataType.key);
/* istanbul ignore next */
if (!dataTypeNode) {
throw new Error(" Cannot find DataType " + dataType.key + " in address Space");
}
return dataTypeNode;
}
/*=
*
* @param addressSpace
* @param dataTypeNodeId : the nodeId matching the dataType of the destination variable.
* @param variantDataType: the dataType of the variant to write to the destination variable
* @param nodeId
* @return {boolean} true if the variant dataType is compatible with the Variable DataType
*/
function validateDataType(addressSpace, dataTypeNodeId, variantDataType, nodeId) {
if (variantDataType === DataType.ExtensionObject) {
return true;
}
var builtInType, builtInUADataType;
var destUADataType = addressSpace.findNode(dataTypeNodeId);
assert(destUADataType instanceof UADataType);
if (destUADataType.isAbstract) {
builtInUADataType = destUADataType;
} else {
builtInType = findBuiltInType(destUADataType.browseName).name;
builtInUADataType = addressSpace.findDataType(builtInType);
}
assert(builtInUADataType instanceof UADataType);
// The value supplied for the attribute is not of the same type as the value.
var variantUADataType = _dataType_toUADataType(addressSpace, variantDataType);
assert(variantUADataType instanceof UADataType);
var dest_isSuperTypeOf_variant = variantUADataType.isSupertypeOf(builtInUADataType);
/* istanbul ignore next */
if (doDebug) {
if (dest_isSuperTypeOf_variant) {
/* istanbul ignore next*/
console.log(" ---------- Type match !!! ".green, " on ", nodeId.toString());
} else {
/* istanbul ignore next*/
console.log(" ---------- Type mismatch ".red, " on ", nodeId.toString());
}
console.log(" Variable data Type is = ".cyan, destUADataType.browseName.toString());
console.log(" which matches basic Type = ".cyan, builtInUADataType.browseName.toString());
console.log(" Actual dataType = ".yellow, variantUADataType.browseName.toString());
}
return (dest_isSuperTypeOf_variant);
}
var sameVariant = require("node-opcua-variant").sameVariant;
/**
* A OPCUA Variable Node
*
* @class UAVariable
* @constructor
* @extends BaseNode
* @param options {Object}
* @param options.value
* @param options.browseName {string}
* @param options.dataType {NodeId|String}
* @param options.valueRank {Int32}
* @param options.arrayDimensions {null|Array<Integer>}
* @param options.accessLevel {AccessLevel}
* @param options.userAccessLevel {AccessLevel}
* @param [options.minimumSamplingInterval = -1]
* @param [options.historizing = false] {Boolean}
* @param [options.permissions]
* @param options.parentNodeId {NodeId}
*
* The AccessLevel Attribute is used to indicate how the Value of a Variable can be accessed (read/write) and if it
* contains current and/or historic data. The AccessLevel does not take any user access rights into account,
* i.e. although the Variable is writable this may be restricted to a certain user / user group.
* The AccessLevel is an 8-bit unsigned integer with the structure defined in the following table:
*
* Field Bit Description
* CurrentRead 0 Indicates if the current value is readable
* (0 means not readable, 1 means readable).
* CurrentWrite 1 Indicates if the current value is writable
* (0 means not writable, 1 means writable).
* HistoryRead 2 Indicates if the history of the value is readable
* (0 means not readable, 1 means readable).
* HistoryWrite 3 Indicates if the history of the value is writable (0 means not writable, 1 means writable).
* SemanticChange 4 Indicates if the Variable used as Property generates SemanticChangeEvents (see 9.31).
* Reserved 5:7 Reserved for future use. Shall always be zero.
*
* The first two bits also indicate if a current value of this Variable is available and the second two bits
* indicates if the history of the Variable is available via the OPC UA server.
*
*/
function UAVariable(options) {
var self = this;
BaseNode.apply(this, arguments);
// assert(self.typeDefinition.value === self.resolveNodeId("VariableTypeNode").value);
/**
* @property dataType
* @type {NodeId}
*/
self.dataType = self.resolveNodeId(options.dataType); // DataType (NodeId)
assert(self.dataType instanceof NodeId);
/**
* @property valueRank
* @type {number} UInt32
* This Attribute indicates whether the Value Attribute of the Variable is an array and how many dimensions
* the array has.
* It may have the following values:
* n > 1: the Value is an array with the specified number of dimensions.
* OneDimension (1): The value is an array with one dimension.
* OneOrMoreDimensions (0): The value is an array with one or more dimensions.
* Scalar (?1): The value is not an array.
* Any (?2): The value can be a scalar or an array with any number of dimensions.
* ScalarOrOneDimension (?3): The value can be a scalar or a one dimensional array.
* NOTE All DataTypes are considered to be scalar, even if they have array-like semantics
* like ByteString and String.
*/
self.valueRank = options.valueRank || 0; // UInt32
assert(typeof self.valueRank === "number");
/**
* This Attribute specifies the length of each dimension for an array value. T
* @property arrayDimensions
* @type {number[]} UInt32
* The Attribute is intended to describe the capability of the Variable, not the current size.
* The number of elements shall be equal to the value of the ValueRank Attribute. Shall be null
* if ValueRank ? 0.
* A value of 0 for an individual dimension indicates that the dimension has a variable length.
* For example, if a Variable is defined by the following C array:
* Int32 myArray[346];
* then this Variables DataType would point to an Int32, the Variable�s ValueRank has the
* value 1 and the ArrayDimensions is an array with one entry having the value 346.
* Note that the maximum length of an array transferred on the wire is 2147483647 (max Int32)
* and a multidimentional array is encoded as a one dimensional array.
*/
self.arrayDimensions = options.arrayDimensions || null;
assert(_.isNull(self.arrayDimensions) || _.isArray(self.arrayDimensions));
/**
* @property accessLevel
* @type {number}
*/
self.accessLevel = adjust_accessLevel(options.accessLevel);
/**
* @property userAccessLevel
* @type {number}
*
*/
self.userAccessLevel = adjust_userAccessLevel(options.userAccessLevel);
/**
* The MinimumSamplingInterval Attribute indicates how 'current' the Value of the Variable will
* be kept.
* @property minimumSamplingInterval
* @type {number} [Optional]
* It specifies (in milliseconds) how fast the Server can reasonably sample the value
* for changes (see Part 4 for a detailed description of sampling interval).
* A MinimumSamplingInterval of 0 indicates that the Server is to monitor the item continuously.
* A MinimumSamplingInterval of -1 means indeterminate.
*/
self.minimumSamplingInterval = adjust_samplingInterval(options.minimumSamplingInterval);
self.parentNodeId = options.parentNodeId;
/**
* The Historizing Attribute indicates whether the Server is actively collecting data for the
* history of the Variable.
* @property historizing
* @type {Boolean}
* This differs from the AccessLevel Attribute which identifies if the
* Variable has any historical data. A value of TRUE indicates that the Server is actively
* collecting data. A value of FALSE indicates the Server is not actively collecting data.
* Default value is FALSE.
*/
self.historizing = !!options.historizing; // coerced to boolean
self._dataValue = new DataValue({statusCode: StatusCodes.BadWaitingForInitialData, value: {}});
if (options.value) {
self.bindVariable(options.value);
}
if (options.permissions) {
self.setPermissions(options.permissions);
}
this.setMaxListeners(5000);
self.semantic_version = 0;
self.permission = null;
}
util.inherits(UAVariable, BaseNode);
UAVariable.prototype.nodeClass = NodeClass.Variable;
/**
*
*
* @param context {SesionContext}
* @return {boolean}
*/
UAVariable.prototype.isReadable = function (context) {
assert(context instanceof SessionContext);
return this.accessLevel.has("CurrentRead");
};
/**
*
*
* @param context {SesionContext}
* @return {boolean}
*/
UAVariable.prototype.isUserReadable = function (context) {
var self = this;
assert(context instanceof SessionContext);
if (context.checkPermission) {
assert(context.checkPermission instanceof Function);
return context.checkPermission(self, "CurrentRead");
}
return this.userAccessLevel.has("CurrentRead");
};
/**
*
*
* @param context {SessionContext}
* @return {boolean}
*/
UAVariable.prototype.isWritable = function (context) {
assert(context instanceof SessionContext);
return this.accessLevel.has("CurrentWrite");
};
/**
*
*
* @param context {SessionContext}
* @return {boolean}
*/
UAVariable.prototype.isUserWritable = function (context) {
var self = this;
assert(context instanceof SessionContext);
if (context.checkPermission) {
assert(context.checkPermission instanceof Function);
return context.checkPermission(self, "CurrentWrite");
}
return this.userAccessLevel.has("CurrentWrite");
};
/**
*
* @method readValue
* @param [context] {SessionContext}
* @param [indexRange] {NumericRange|null}
* @param [dataEncoding] {String}
* @return {DataValue}
*
*
* from OPC.UA.Spec 1.02 part 4
* 5.10.2.4 StatusCodes
* Table 51 defines values for the operation level statusCode contained in the DataValue structure of
* each values element. Common StatusCodes are defined in Table 166.
*
* Table 51 Read Operation Level Result Codes
*
* Symbolic Id Description
*
* BadNodeIdInvalid The syntax of the node id is not valid.
* BadNodeIdUnknown The node id refers to a node that does not exist in the server address space.
* BadAttributeIdInvalid Bad_AttributeIdInvalid The attribute is not supported for the specified node.
* BadIndexRangeInvalid The syntax of the index range parameter is invalid.
* BadIndexRangeNoData No data exists within the range of indexes specified.
* BadDataEncodingInvalid The data encoding is invalid.
* This result is used if no dataEncoding can be applied because an Attribute other than
* Value was requested or the DataType of the Value Attribute is not a subtype of the
* Structure DataType.
* BadDataEncodingUnsupported The server does not support the requested data encoding for the node.
* This result is used if a dataEncoding can be applied but the passed data encoding is not
* known to the Server.
* BadNotReadable The access level does not allow reading or subscribing to the Node.
* BadUserAccessDenied User does not have permission to perform the requested operation. (table 165)
*/
UAVariable.prototype.readValue = function (context, indexRange, dataEncoding) {
if (!context) {
context = SessionContext.defaultContext;
}
var self = this;
if (!self.isReadable(context)) {
return new DataValue({statusCode: StatusCodes.BadNotReadable});
}
if (!self.isUserReadable(context)) {
return new DataValue({statusCode: StatusCodes.BadUserAccessDenied});
}
if (!is_valid_dataEncoding(dataEncoding)) {
return new DataValue({statusCode: StatusCodes.BadDataEncodingInvalid});
}
if (self._timestamped_get_func) {
assert(self._timestamped_get_func.length === 0);
self._dataValue = self._timestamped_get_func();
}
var dataValue = self._dataValue;
if (isGoodish(dataValue.statusCode)) {
dataValue = extractRange(dataValue, indexRange);
}
/* istanbul ignore next */
if (dataValue.statusCode === StatusCodes.BadWaitingForInitialData) {
debugLog(" Warning: UAVariable#readValue ".red + self.browseName.toString().cyan + " (" + self.nodeId.toString().yellow + ") exists but dataValue has not been defined");
}
return dataValue;
};
UAVariable.prototype._getEnumValues = function () {
var self = this;
// DataType must be one of Enumeration
var dataTypeNode = self.addressSpace.findDataType(self.dataType);
var enumerationNode = self.addressSpace.findDataType("Enumeration");
assert(dataTypeNode.isSupertypeOf(enumerationNode));
return dataTypeNode._getDefinition();
};
UAVariable.prototype.readEnumValue = function readEnumValue() {
var self = this;
var indexes = self._getEnumValues();
var value = self.readValue().value.value;
return {value: value, name: indexes.valueIndex[value].name};
};
/***
* @method writeEnumValue
* @param value {String|Number}
*/
UAVariable.prototype.writeEnumValue = function writeEnumValue(value) {
var self = this;
var indexes = self._getEnumValues();
if (_.isString(value)) {
if (!indexes.nameIndex.hasOwnProperty(value)) {
throw new Error("UAVariable#writeEnumValue: cannot find value " + value);
}
var valueIndex = indexes.nameIndex[value].value;
value = valueIndex;
}
if (_.isFinite(value)) {
if (!indexes.valueIndex[value]) {
throw new Error("UAVariable#writeEnumValue : value out of range", value);
}
self.setValueFromSource({dataType: DataType.Int32, value: value});
} else {
throw new Error("UAVariable#writeEnumValue: value type mismatch");
}
};
UAVariable.prototype._readDataType = function () {
assert(this.dataType instanceof NodeId);
var options = {
value: {dataType: DataType.NodeId, value: this.dataType},
statusCode: StatusCodes.Good
};
return new DataValue(options);
};
UAVariable.prototype._readValueRank = function () {
assert(typeof this.valueRank === "number");
var options = {
value: {dataType: DataType.Int32, value: this.valueRank},
statusCode: StatusCodes.Good
};
return new DataValue(options);
};
UAVariable.prototype._readArrayDimensions = function () {
assert(_.isArray(this.arrayDimensions) || this.arrayDimensions === null);
var options = {
value: {dataType: DataType.UInt32, arrayType: VariantArrayType.Array, value: this.arrayDimensions},
statusCode: StatusCodes.Good
};
return new DataValue(options);
};
UAVariable.prototype._readAccessLevel = function (context) {
assert(context instanceof SessionContext);
var options = {
value: {dataType: DataType.Byte, value: AccessLevelFlag.toByte(this.accessLevel)},
statusCode: StatusCodes.Good
};
return new DataValue(options);
};
UAVariable.prototype._readUserAccessLevel = function (context) {
assert(context instanceof SessionContext);
var options = {
value: {dataType: DataType.Byte, value: AccessLevelFlag.toByte(this.userAccessLevel)},
statusCode: StatusCodes.Good
};
return new DataValue(options);
};
UAVariable.prototype._readMinimumSamplingInterval = function () {
// expect a Duration => Double
var options = {};
if (this.minimumSamplingInterval === undefined) {
options.statusCode = StatusCodes.BadAttributeIdInvalid;
} else {
options.value = {dataType: DataType.Double, value: this.minimumSamplingInterval};
options.statusCode = StatusCodes.Good;
}
return new DataValue(options);
};
UAVariable.prototype._readHistorizing = function () {
assert(typeof(this.historizing) === "boolean");
var options = {
value: {dataType: DataType.Boolean, value: !!this.historizing},
statusCode: StatusCodes.Good
};
return new DataValue(options);
};
/**
* @method readAttribute
* @param context {SessionContext}
* @param attributeId {AttributeIds} the attributeId to read
* @param indexRange {NumericRange || null}
* @param dataEncoding {String}
* @return {DataValue}
*/
UAVariable.prototype.readAttribute = function (context, attributeId, indexRange, dataEncoding) {
if (!context) {
context = SessionContext.defaultContext;
}
assert(context instanceof SessionContext);
var options = {};
if (attributeId !== AttributeIds.Value) {
if (indexRange && indexRange.isDefined()) {
options.statusCode = StatusCodes.BadIndexRangeNoData;
return new DataValue(options);
}
if (is_dataEncoding(dataEncoding)) {
options.statusCode = StatusCodes.BadDataEncodingInvalid;
return new DataValue(options);
}
}
switch (attributeId) {
case AttributeIds.Value:
return this.readValue(context, indexRange, dataEncoding);
case AttributeIds.DataType:
return this._readDataType();
case AttributeIds.ValueRank:
return this._readValueRank();
case AttributeIds.ArrayDimensions:
return this._readArrayDimensions();
case AttributeIds.AccessLevel:
return this._readAccessLevel(context);
case AttributeIds.UserAccessLevel:
return this._readUserAccessLevel(context);
case AttributeIds.MinimumSamplingInterval:
return this._readMinimumSamplingInterval();
case AttributeIds.Historizing:
return this._readHistorizing();
default:
return BaseNode.prototype.readAttribute.call(this, context, attributeId);
}
};
UAVariable.prototype._validate_DataType = function (variantDataType) {
return validateDataType(this.addressSpace, this.dataType, variantDataType, this.nodeId);
};
function check_valid_array(dataType, array) {
if (_.isArray(array)) {
return true;
}
switch (dataType) {
case DataType.Double:
return array instanceof Float64Array;
case DataType.Float:
return array instanceof Float32Array;
case DataType.Int32:
return array instanceof Int32Array;
case DataType.Int16:
return array instanceof Int16Array;
case DataType.SByte:
return array instanceof Int8Array;
case DataType.UInt32:
return array instanceof Uint32Array;
case DataType.UInt16:
return array instanceof Uint16Array;
case DataType.Byte:
return array instanceof Uint8Array || array instanceof Buffer;
}
return false;
}
/**
* setValueFromSource is used to let the device sets the variable values
* this method also records the current time as sourceTimestamp and serverTimestamp.
* the method broadcasts an "value_changed" event
* @method setValueFromSource
* @param variant {Variant}
* @param [statusCode {StatusCode} === StatusCodes.Good]
* @param [sourceTimestamp= Now]
*/
UAVariable.prototype.setValueFromSource = function (variant, statusCode, sourceTimestamp) {
var self = this;
// istanbul ignore next
if (variant.hasOwnProperty("value")) {
if (!variant.dataType) {
throw new Error("Variant must provide a valid dataType" + variant.toString());
}
}
// if (variant.hasOwnProperty("value")) {
// if (variant.dataType === DataType.UInt32) {
// if (!_.isFinite(variant.value)) {
// throw new Error("Expecting an number");
// }
// }
// }
variant = Variant.coerce(variant);
var now = coerceClock(sourceTimestamp, 0);
var dataValue = new DataValue({
sourceTimestamp: now.timestamp,
sourcePicoseconds: now.picoseconds,
serverTimestamp: now.timestamp,
serverPicoseconds: now.picoseconds,
statusCode: statusCode || StatusCodes.Good
});
dataValue.value = variant;
self._internal_set_dataValue(dataValue, null);
};
function _apply_default_timestamps(dataValue) {
var now = getCurrentClock();
assert(dataValue instanceof DataValue);
if (!dataValue.sourceTimestamp) {
dataValue.sourceTimestamp = now.timestamp;
dataValue.sourcePicoseconds = now.picoseconds;
}
if (!dataValue.serverTimestamp) {
dataValue.serverTimestamp = now.timestamp;
dataValue.serverPicoseconds = now.picoseconds;
}
}
/**
*
* @note : this method is overridden in address-space-data-access
* @return {StatusCode}
*/
UAVariable.prototype.isValueInRange = function () {
return StatusCodes.Good;
};
/**
* @method writeValue
* @param context {SessionContext}
* @param dataValue {DataValue}
* @param [indexRange] {NumericRange}
* @param callback {Function}
* @param callback.err {Error|null}
* @param callback.statusCode {StatusCode}
* @async
*
*/
UAVariable.prototype.writeValue = function (context, dataValue, indexRange, callback) {
if (!context) {
context = SessionContext.defaultContext;
}
if (!dataValue.sourceTimestamp) {
var clock = getCurrentClock();
dataValue.sourceTimestamp = clock.timestamp;
dataValue.sourcePicoseconds = clock.picoseconds;
}
assert(context instanceof SessionContext);
var self = this;
// adjust arguments if optional indexRange Parameter is not given
if (!_.isFunction(callback) && _.isFunction(indexRange)) {
callback = indexRange;
indexRange = new NumericRange();
}
assert(_.isFunction(callback));
assert(dataValue instanceof DataValue);
indexRange = NumericRange.coerce(indexRange);
// test write permission
if (!self.isWritable(context)) {
return callback(null, StatusCodes.BadNotWritable);
}
if (!self.isUserWritable(context)) {
return callback(null, StatusCodes.BadUserAccessDenied);
}
// adjust special case
// convert Variant( Scalar|ByteString) => Variant(Array|ByteArray)
var variant = dataValue.value;
if (variant.arrayType === VariantArrayType.Scalar && variant.dataType === DataType.ByteString) {
if ((self.dataType === DataType.Byte) && (self.dataType.namespace === 0)) { // Byte
variant.arrayType = VariantArrayType.Array;
variant.dataType = DataType.Byte;
}
}
var statusCode = self.isValueInRange(dataValue.value);
if (statusCode !== StatusCodes.Good) {
return callback(null, statusCode);
}
if (!self._timestamped_set_func) {
console.log(" warning " + self.nodeId.toString() + " has no _timestamped_set_func");
return callback(null, StatusCodes.BadNotWritable);
}
assert(self._timestamped_set_func);
self._timestamped_set_func(dataValue, indexRange, function (err, statusCode, correctedDataValue) {
if (!err) {
correctedDataValue = correctedDataValue || dataValue;
assert(correctedDataValue instanceof DataValue);
//xx assert(correctedDataValue.serverTimestamp);
if (indexRange && !indexRange.isEmpty()) {
if (!indexRange.isValid()) {
return callback(null, StatusCodes.BadIndexRangeInvalid);
}
var newArr = correctedDataValue.value.value;
// check that source data is an array
if (correctedDataValue.value.arrayType !== VariantArrayType.Array) {
return callback(null, StatusCodes.BadTypeMismatch);
}
// check that destination data is also an array
assert(check_valid_array(self._dataValue.value.dataType, self._dataValue.value.value));
var destArr = self._dataValue.value.value;
var result = indexRange.set_values(destArr, newArr);
if (result.statusCode !== StatusCodes.Good) {
return callback(null, result.statusCode);
}
correctedDataValue.value.value = result.array;
// scrap original array so we detect range
self._dataValue.value.value = null;
}
self._internal_set_dataValue(correctedDataValue, indexRange);
//xx self._dataValue = correctedDataValue;
}
callback(err, statusCode);
});
};
/**
* @method writeAttribute
* @param context {SessionContext}
* @param writeValue {WriteValue}
* @param writeValue.nodeId {NodeId}
* @param writeValue.attributeId {AttributeId}*
* @param writeValue.value {DataValue}
* @param writeValue.indexRange {NumericRange}
* @param callback {Function}
* @param callback.err {Error|null}
* @param callback.statusCode {StatusCode}
* @async
*/
UAVariable.prototype.writeAttribute = function (context, writeValue, callback) {
assert(context instanceof SessionContext);
assert(writeValue instanceof WriteValue);
assert(writeValue.value instanceof DataValue);
assert(writeValue.value.value instanceof Variant);
assert(_.isFunction(callback));
// Spec 1.0.2 Part 4 page 58
// If the SourceTimestamp or the ServerTimestamp is specified, the Server shall
// use these values.
//xx _apply_default_timestamps(writeValue.value);
switch (writeValue.attributeId) {
case AttributeIds.Value:
this.writeValue(context, writeValue.value, writeValue.indexRange, callback);
break;
default:
BaseNode.prototype.writeAttribute.call(this, context, writeValue, callback);
}
};
function _not_writable_timestamped_set_func(dataValue, callback) {
assert(dataValue instanceof DataValue);
callback(null, StatusCodes.BadNotWritable, null);
}
function _default_writable_timestamped_set_func(dataValue, callback) {
/* jshint validthis: true */
assert(dataValue instanceof DataValue);
callback(null, StatusCodes.Good, dataValue);
}
function turn_sync_to_async(f, numberOfArgs) {
if (f.length <= numberOfArgs) {
return function (data, callback) {
var r = f(data);
setImmediate(function () {
return callback(null, r);
});
};
} else {
assert(f.length === numberOfArgs + 1);
return f;
}
}
var _default_minimumSamplingInterval = 1000;
// variation #3 :
function _Variable_bind_with_async_refresh(options) {
/* jshint validthis: true */
var self = this;
assert(self instanceof UAVariable);
assert(_.isFunction(options.refreshFunc));
assert(!options.get, "a getter shall not be specified when refreshFunc is set");
assert(!options.timestamped_get, "a getter shall not be specified when refreshFunc is set");
assert(!self.asyncRefresh);
assert(!self.refreshFunc);
self.refreshFunc = options.refreshFunc;
function coerceDataValue(dataValue) {
if (dataValue instanceof DataValue) {
return dataValue;
}
return new DataValue(dataValue);
}
self.asyncRefresh = function (callback) {
self.refreshFunc.call(self, function (err, dataValue) {
if (err || !dataValue) {
dataValue = {statusCode: StatusCodes.BadNoDataAvailable};
}
dataValue = coerceDataValue(dataValue);
self._internal_set_dataValue(dataValue, null);
callback(err, self._dataValue);
});
};
//assert(self._dataValue.statusCode === StatusCodes.BadNodeIdUnknown);
self._dataValue.statusCode = StatusCodes.UncertainInitialValue;
// TO DO : REVISIT THIS ASSUMPTION
if (false && self.minimumSamplingInterval === 0) {
// when a getter /timestamped_getter or async_getter is provided
// samplingInterval cannot be 0, as the item value must be scanned to be updated.
self.minimumSamplingInterval = _default_minimumSamplingInterval; // MonitoredItem.minimumSamplingInterval;
debugLog("adapting minimumSamplingInterval on " + self.browseName.toString() + " to " + self.minimumSamplingInterval);
}
}
// variation 2
function _Variable_bind_with_timestamped_get(options) {
/* jshint validthis: true */
var self = this;
assert(self instanceof UAVariable);
assert(_.isFunction(options.timestamped_get));
assert(!options.get, "should not specify 'get' when 'timestamped_get' exists ");
assert(!self._timestamped_get_func);
function async_refresh_func(callback) {
var dataValue = self._timestamped_get_func();
callback(null, dataValue);
}
if (options.timestamped_get.length === 0) {
// sync version
self._timestamped_get_func = options.timestamped_get;
var dataValue_verify = self._timestamped_get_func();
/* istanbul ignore next */
if (!(dataValue_verify instanceof DataValue)) {
console.log(" Bind variable error: ".red, " : the timestamped_get function must return a DataValue");
console.log("value_check.constructor.name ", dataValue_verify ? dataValue_verify.constructor.name : "null");
throw new Error(" Bind variable error: ".red, " : the timestamped_get function must return a DataValue");
}
_Variable_bind_with_async_refresh.call(self, {refreshFunc: async_refresh_func});
} else if (options.timestamped_get.length === 1) {
_Variable_bind_with_async_refresh.call(self, {refreshFunc: options.timestamped_get});
} else {
throw new Error("timestamped_get has a invalid number of argument , should be 0 or 1 ");
}
}
// variation 1
function _Variable_bind_with_simple_get(options) {
/* jshint validthis: true */
var self = this;
assert(self instanceof UAVariable);
assert(_.isFunction(options.get), "should specify get function");
assert(options.get.length === 0, "get function should not have arguments");
assert(!options.timestamped_get, "should not specify a timestamped_get function when get is specified");
assert(!self._timestamped_get_func);
assert(!self._get_func);
self._get_func = options.get;
function timestamped_get_func_from__Variable_bind_with_simple_get() {
var value = self._get_func();
/* istanbul ignore next */
if (!is_Variant_or_StatusCode(value)) {
console.log(" Bind variable error: ".red, " : the getter must return a Variant or a StatusCode");
console.log("value_check.constructor.name ", value ? value.constructor.name : "null");
throw new Error(" bindVariable : the value getter function returns a invalid result ( expecting a Variant or a StatusCode !!!");
}
if (is_StatusCode(value)) {
return new DataValue({statusCode: value});
} else {
if (!self._dataValue || !isGoodish(self._dataValue.statusCode) || !sameVariant(self._dataValue.value, value)) {
self.setValueFromSource(value, StatusCodes.Good);
} else {
//XXXY console.log("YYYYYYYYYYYYYYYYYYYYYYYYYY".red,self.browseName.toString());
}
return self._dataValue;
}
}
_Variable_bind_with_timestamped_get.call(self, {timestamped_get: timestamped_get_func_from__Variable_bind_with_simple_get});
}
function _Variable_bind_with_simple_set(options) {
/* jshint validthis: true */
var self = this;
assert(self instanceof UAVariable);
assert(_.isFunction(options.set), "should specify set function");
assert(!options.timestamped_set, "should not specify a timestamped_set function");
assert(!self._timestamped_set_func);
assert(!self._set_func);
self._set_func = turn_sync_to_async(options.set, 1);
assert(self._set_func.length === 2, " set function must have 2 arguments ( variant, callback)");
self._timestamped_set_func = function (timestamped_value, indexRange, callback) {
assert(timestamped_value instanceof DataValue);
self._set_func(timestamped_value.value, function (err, statusCode) {
callback(err, statusCode, timestamped_value);
});
};
}
function _Variable_bind_with_timestamped_set(options) {
/* jshint validthis: true */
var self = this;
assert(self instanceof UAVariable);
assert(_.isFunction(options.timestamped_set));
assert(!options.set, "should not specify set when timestamped_set_func exists ");
self._timestamped_set_func = function (dataValue, indexRange, callback) {
//xx assert(!indexRange,"indexRange Not Implemented");
return options.timestamped_set.call(self, dataValue, callback);
};
}
function bind_setter(self, options) {
if (_.isFunction(options.set)) { // variation 1
_Variable_bind_with_simple_set.call(self, options);
} else if (_.isFunction(options.timestamped_set)) { // variation 2
assert(_.isFunction(options.timestamped_get, "timestamped_set must be used with timestamped_get "));
_Variable_bind_with_timestamped_set.call(self, options);
} else if (_.isFunction(options.timestamped_get)) {
// timestamped_get is specified but timestamped_set is not
// => Value is read-only
_Variable_bind_with_timestamped_set.call(self, {timestamped_set: _not_writable_timestamped_set_func});
} else {
_Variable_bind_with_timestamped_set.call(self, {timestamped_set: _default_writable_timestamped_set_func});
}
}
function bind_getter(self, options) {
if (_.isFunction(options.get)) { // variation 1
_Variable_bind_with_simple_get.call(self, options);
} else if (_.isFunction(options.timestamped_get)) { // variation 2
_Variable_bind_with_timestamped_get.call(self, options);
} else if (_.isFunction(options.refreshFunc)) { // variation 3
_Variable_bind_with_async_refresh.call(self, options);
} else {
assert(!options.set, "getter is missing : a getter must be provided if a setter is provided");
//xx bind_variant.call(self,options);
self.setValueFromSource(options);
}
}
/**
* touch the source timestamp of a Variable and cascade up the change
* to the parent variable if any.
*
* @param optionalNow {Object}
* @param optionalNow.timestamp {Date}
* @param optionalNow.picoseconds {Number}
*/
UAVariable.prototype.touchValue = function (optionalNow) {
var variable = this;
var now = optionalNow || getCurrentClock();
variable._dataValue.sourceTimestamp = now.timestamp;
variable._dataValue.sourcePicoseconds = now.picoseconds;
variable._dataValue.serverTimestamp = now.timestamp;
variable._dataValue.serverPicoseconds = now.picoseconds;
variable._dataValue.statusCode = StatusCodes.Good;
if (variable.minimumSamplingInterval === 0) {
//xx console.log("xxx touchValue = ",variable.browseName.toString(),variable._dataValue.value.value);
variable.emit("value_changed", variable._dataValue);
}
if (variable.parent && variable.parent.nodeClass == NodeClass.Variable) {
variable.parent.touchValue(now);
}
};
UAVariable.prototype._internal_set_dataValue = function (dataValue, indexRange) {
//xx if(this.nodeId.toString()=== "ns=411;s=Scalar_Static_Int32") {
//xx console.log("xxxx _internal_set_dataValue = ".green,dataValue.toString());
//xx }
var self = this;
assert(dataValue, "expecting a dataValue");
assert(dataValue instanceof DataValue, "expecting dataValue to be a DataValue");
assert(dataValue !== self.__dataValue, "expecting dataValue to be different from previous DataValue instance");
var old_dataValue = self._dataValue;
self._dataValue = dataValue;
self._dataValue.statusCode = self._dataValue.statusCode || StatusCodes.Good;
// repair missing timestamps
if (!dataValue.serverTimestamp) {
self._dataValue.serverTimestamp = old_dataValue.serverTimestamp;
self._dataValue.serverPicoseconds = old_dataValue.serverPicoseconds;
}
if (!dataValue.sourceTimestamp) {
self._dataValue.sourceTimestamp = old_dataValue.sourceTimestamp;
self._dataValue.sourcePicoseconds = old_dataValue.sourcePicoseconds;
}
// if (dataValue.value.arrayType ===VariantArrayType.Array) {
// console.log("xxxx UAVariable emit value_changed ??".bgRed, old_dataValue.value.toString(),dataValue.value.toString());
// }
if (!sameDataValue(old_dataValue, dataValue)) {
//xx if(this.nodeId.toString()=== "ns=411;s=Scalar_Static_Int32") {
//xx console.log("UAVariable emit value_changed");
//xx }
self.emit("value_changed", self._dataValue, indexRange);
}
};
/**
* bind a variable with a get and set functions.
*
* @method bindVariable
* @param options
* @param [options.dataType=null] {DataType} the nodeId of the dataType
* @param [options.accessLevel] {Number} AccessLevelFlagItem
* @param [options.userAccessLevel] {Number} AccessLevelFlagItem
* @param [options.set] {Function} the variable setter function
* @param [options.get] {Function} the variable getter function. the function must return a Variant or a status code
* @param [options.timestamped_get] {Function} the getter function. this function must return a object with the following
* @param [options.historyRead] {Function}
*
* properties:
* - value: a Variant or a status code
* - sourceTimestamp
* - sourcePicoseconds
* @param [options.timestamped_set] {Function}
* @param [options.refreshFunc] {Function} the variable asynchronous getter function.
* @param [overwrite {Boolean} = false] set overwrite to true to overwrite existing binding
* @return void
*
*
* ### Providing read access to the underlying value
*
* #### Variation 1
*
* In this variation, the user provides a function that returns a Variant with the current value.
*
* The sourceTimestamp will be set automatically.
*
* The get function is called synchronously.
*
* @example
*
*
* ```javascript
* ...
* var options = {
* get : function() {
* return new Variant({...});
* },
* set : function(variant) {
* // store the variant somewhere
* return StatusCodes.Good;
* }
* };
* ...
* engine.bindVariable(nodeId,options):
* ...
* ```
*
*
* #### Variation 2:
*
* This variation can be used when the user wants to specify a specific '''sourceTimestamp''' associated
* with the current value of the UAVariable.
*
* The provided ```timestamped_get``` function should return an object with three properties:
* * value: containing the variant value or a error StatusCode,
* * sourceTimestamp
* * sourcePicoseconds
*
* ```javascript
* ...
* var myDataValue = new DataValue({
* value: {dataType: DataType.Double , value: 10.0},
* sourceTimestamp : new Date(),
* sourcePicoseconds: 0
* });
* ...
* var options = {
* timestamped_get : function() { return myDataValue; }
* };
* ...
* engine.bindVariable(nodeId,options):
* ...
* // record a new value
* myDataValue.value.value = 5.0;
* myDataValue.sourceTimestamp = new Date();
* ...
* ```
*
*
* #### Variation 3:
*
* This variation can be used when the value associated with the variables requires a asynchronous function call to be
* extracted. In this case, the user should provide an async method ```refreshFunc```.
*
*
* The ```refreshFunc``` shall do whatever is necessary to fetch the most up to date version of the variable value, and
* call the ```callback``` function when the data is ready.
*
*
* The ```callback``` function follow the standard callback function signature:
* * the first argument shall be **null** or **Error**, depending of the outcome of the fetch operation,
* * the second argument shall be a DataValue with the new UAVariable Value, a StatusCode, and time stamps.
*
*
* Optionally, it is possible to pass a sourceTimestamp and a sourcePicoseconds value as a third and fourth arguments
* of the callback. When sourceTimestamp and sourcePicoseconds are missing, the system will set their default value
* to the current time..
*
*
* ```javascript
* ...
* var options = {
* refreshFunc : function(callback) {
* ... do_some_async_stuff_to_get_the_new_variable_value
* var dataValue = new DataValue({
* value: new Variant({...}),
* statusCode: StatusCodes.Good,
* sourceTimestamp: new Date()
* });
* callback(null,dataValue);
* }
* };
* ...
* variable.bindVariable(nodeId,options):
* ...
* ```
*
* ### Providing write access to the underlying value
*
* #### Variation1 - provide a simple synchronous set function
*
*
* #### Notes
* to do : explain return StatusCodes.GoodCompletesAsynchronously;
*
*/
UAVariable.prototype.setPermissions = function (permissions) {
this._permissions = permissions;
};
UAVariable.prototype.bindVariable = function (options, overwrite) {
var self = this;
if (overwrite) {
self._timestamped_set_func = null;
self._timestamped_get_func = null;
self._get_func = null;
self._set_func = null;
self.asyncRefresh = null;
self.refreshFunc = null;
self._historyRead = null;
}
options = options || {};
assert(!_.isFunction(self._timestamped_set_func), "UAVariable already bounded");
assert(!_.isFunction(self._timestamped_get_func), "UAVariable already bounded");
bind_getter(self, options);
bind_setter(self, options);
if (options.historyRead) {
assert(!_.isFunction(self._historyRead));
assert(_.isFunction(options.historyRead));
self._historyRead = options.historyRead;
assert(self._historyRead.length === 6);
}
assert(_.isFunction(self._timestamped_set_func));
assert(self._timestamped_set_func.length === 3);
};
/**
* @method readValueAsync
* @param context {SessionContext}
* @param callback {Function}
* @param callback.err {null|Error}
* @param callback.dataValue {DataValue|null} the value read
* @async
*/
UAVariable.prototype.readValueAsync = function (context, callback) {
var self = this;
assert(context instanceof SessionContext);
assert(callback instanceof Function);
self.__waiting_callbacks = self.__waiting_callbacks || [];
self.__waiting_callbacks.push(callback);
var _readValueAsync_in_progress = self.__waiting_callbacks.length >= 2;
if (_readValueAsync_in_progress) {
return;
}
function readImmediate(callback) {
assert(self._dataValue instanceof DataValue);
var dataValue = this.readValue();
callback(null, dataValue);
}
var func = null;
if (!self.isReadable(context)) {
func = function (callback) {
var dataValue = new DataValue({statusCode: StatusCodes.BadNotReadable});
callback(null, dataValue);
}
} else if (!self.isUserReadable(context)) {
func = function (callback) {
var dataValue = new DataValue({statusCode: StatusCodes.BadUserAccessDenied});
callback(null, dataValue);
}
} else {
func = _.isFunction(self.asyncRefresh) ? self.asyncRefresh : readImmediate;
}
function satisfy_callbacks(err, dataValue) {
// now call all pending callbacks
var callbacks = self.__waiting_callbacks;
self.__waiting_callbacks = [];
var i = 0, n = callbacks.length, callback;
for (; i < n; i++) {
callback = callbacks[i];
callback.call(self, err, dataValue);
}
}
try {
func.call(this, satisfy_callbacks);
}
catch (err) {
// istanbul ignore next
console.log("func readValueAsync has failed ".red);
console.log(" stack", err.stack);
satisfy_callbacks(err);
}
};
UAVariable.prototype.getWriteMask = function () {
return BaseNode.prototype.getWriteMask.call(this);
};
UAVariable.prototype.getUserWriteMask = function () {
return BaseNode.prototype.getUserWriteMask.call(this);
};
UAVariable.prototype.clone = function (options, optionalfilter, extraInfo) {
var self = this;
options = options || {};
options = _.extend(_.clone(options), {
eventNotifier: self.eventNotifier,
symbolicName: self.symbolicName,
//xx value: self.value,
dataType: self.dataType,
valueRank: self.valueRank,
arrayDimensions: self.arrayDimensions,
accessLevel: self.accessLevel,
userAccessLevel: self.userAccessLevel,
minimumSamplingInterval: self.minimumSamplingInterval,
historizing: self.historizing
});
var newVariable = self._clone(UAVariable, options, optionalfilter, extraInfo);
newVariable.bindVariable();
assert(_.isFunction(newVariable._timestamped_set_func));
assert(newVariable.dataType === self.dataType);
newVariable._dataValue = self._dataValue.clone();
return newVariable;
};
var lowerFirstLetter = require("node-opcua-utils").lowerFirstLetter;
function w(str, n) {
return (str + " ").substr(0, n);
}
function makeHandler(variable) {
var handler = {
get: function (target, key, receiver) {
if (target[key] === undefined) {
return undefined;
}
return target[key];
},
set: function (target, key, value, receiver) {
target[key] = value;
if (variable[key] && variable[key].touchValue) {
variable[key].touchValue();
}
return true; // true means the set operation has succeeded
}
};
return handler;
}
UAVariable.prototype.getDataTypeNode = function () {
var self = this;
var addressSpace = self.addressSpace;
var dt = addressSpace.findNode(self.dataType);
// istanbul ignore next
if (!dt) {
throw new Error("cannot find dataType " + self.dataType.toString());
}
return dt;
};
UAVariable.prototype.__defineGetter__("dataTypeObj", function () {
var self = this;
return self.getDataTypeNode();
});
/**
* @param [optionalExtensionObject=null] {ExtensionObject}
* @return {ExtensionObject}
*/
UAVariable.prototype.bindExtensionObject = function (optionalExtensionObject) {
var self = this;
var addressSpace = self.addressSpace;
var structure = addressSpace.findDataType("Structure");
if (!structure) {
// the addressSpace is limited and doesn't provide extension object
// bindExtensionObject cannot be performed and shall finish here.
return null;
}
assert(structure && structure.browseName.toString() === "Structure",
"expecting DataType Structure to be in AddressSpace");
var dt = self.getDataTypeNode();
if (!dt.isSupertypeOf(structure)) {
return null;
}
var Constructor;
// -------------------- make sure we do not bind a variable twice ....
if (self.$extensionObject) {
assert(utils.isNullOrUndefined(optionalExtensionObject), "unsupported case");
Constructor = addressSpace.getExtensionObjectConstructor(self.dataType);
var extensionObject_ = self.readValue().value.value;
assert(extensionObject_.constructor.name === Constructor.name);
assert(self.$extensionObject.constructor.name === Constructor.name);
return self.$extensionObject;
// throw new Error("Variable already bounded");
}
self.$extensionObject = optionalExtensionObject;
// ------------------------------------------------------------------
function prepareVariantValue(dataType, value) {
if ((dataType === DataType.Int32 || dataType === DataType.UInt32) && value && value.key) {
value = value.value;
}
return value;
}
function bindProperty(property, name, extensionObject, dataTypeNodeId) {
var dataType = DataType.get(dataTypeNodeId.value);
property.setValueFromSource(new Variant({
dataType: dataType,
value: prepareVariantValue(dataType, self.$extensionObject[name])
}));
assert(property.readValue().statusCode === StatusCodes.Good);
property.bindVariable({
timestamped_get: function () {
var value = prepareVariantValue(dataType, self.$extensionObject[name]);
property._dataValue.statusCode = StatusCodes.Good;
property._dataValue.value.value = value;
var d = new DataValue(property._dataValue);
return d;
},
timestamped_set: function () {
throw new Error("!!!!");
}
}, true);
}
var components = self.getComponents();
// ------------------------------------------------------
// make sure we have a structure
// ------------------------------------------------------
var s = self.readValue();
if (s.value && s.value.dataType === DataType.Null) {
// create a structure and bind it
var extensionObject_ = self.$extensionObject || addressSpace.constructExtensionObject(self.dataType);
extensionObject_ = new Proxy(extensionObject_, makeHandler(self));
self.$extensionObject = extensionObject_;
var theValue = new Variant({
dataType: DataType.ExtensionObject,
value: self.$extensionObject
});
self.setValueFromSource(theValue, StatusCodes.Good);
self.bindVariable({
timestamped_get: function () {
self._dataValue.value.value = self.$extensionObject;
var d = new DataValue(self._dataValue);
d.value = new Variant(d.value);
return d;
},
timestamped_set: function () {
throw new Error("!!!!");
}
}, true);
}
else {
// verify that variant has the correct type
assert(s.value.dataType === DataType.ExtensionObject);
self.$extensionObject = s.value.value;
assert(self.$extensionObject && self.$extensionObject.constructor, "expecting an valid extension object");
assert(s.statusCode === StatusCodes.Good);
var Constructor = addressSpace.getExtensionObjectConstructor(self.dataType);
assert(Constructor);
assert(self.$extensionObject.constructor.name === Constructor.name);
}
var property, field, camelCaseName;
// ------------------------------------------------------
// now bind each member
// ------------------------------------------------------
for (var fieldIndex = 0; fieldIndex < dt.definition.length; fieldIndex++) {
field = dt.definition[fieldIndex];
camelCaseName = lowerFirstLetter(field.name);
var component = components.filter(function (f) {
return f.browseName.name.toString() === field.name;
});
if (component.length === 1) {
/* istanbul ignore next */
if (doDebug) {
var x = addressSpace.findNode(field.dataType).browseName.toString();
var basicType = addressSpace.findCorrespondingBasicDataType(field.dataType);
console.log("xxx".cyan, " dataType",
w(field.dataType.toString(), 8),
w(field.name, 35),
"valueRank", w(field.valueRank, 3).cyan,
w(x, 25).green,
"basicType = ", w(basicType.toString(), 20).yellow, field.dataType.toString());
}
property = component[0];
}
else {
assert(component.length === 0);
// create a variable (Note we may use ns=1;s=parentName/0:PropertyName)
property = addressSpace.addVariable({
browseName: field.name.toString(),
dataType: field.dataType,
componentOf: self,
minimumSamplingInterval: self.minimumSamplingInterval
});
assert(property.minimumSamplingInterval === self.minimumSamplingInterval);
}
property._dataValue.statusCode = StatusCodes.Good;
property.touchValue();
var dataTypeNodeId = addressSpace.findCorrespondingBasicDataType(field.dataType);
assert(self.$extensionObject.hasOwnProperty(camelCaseName));
if (dataTypeNodeId.value === DataType.ExtensionObject.value) {
assert(self.$extensionObject[camelCaseName] instanceof Object);
self.$extensionObject[camelCaseName] = new Proxy(self.$extensionObject[camelCaseName], makeHandler(property));
property._dataValue.value = new Variant({
dataType: DataType.ExtensionObject,
value: self.$extensionObject[camelCaseName]
});
property.bindExtensionObject();
property.$extensionObject = self.$extensionObject[camelCaseName];
} else {
var dataType = DataType.get(dataTypeNodeId.value);
property._dataValue.value = new Variant({
dataType: dataType,
value: prepareVariantValue(dataType, self.$extensionObject[camelCaseName])
});
}
assert(property.readValue().statusCode === StatusCodes.Good);
bindProperty(property, camelCaseName, self.$extensionObject, dataTypeNodeId);
}
assert(self.$extensionObject instanceof Object);
return self.$extensionObject;
};
function setExtensionObjectValue(node, partialObject) {
var extensionObject = node.$extensionObject;
if (!extensionObject) {
throw new Error("setExtensionObjectValue node has no extension object " + node.browseName.toString());
}
function _update_extension_object(extObject, partialObject) {
var keys = Object.keys(partialObject);
for (var n in keys) {
var prop = keys[n];
if (extObject[prop] instanceof Object) {
_update_extension_object(extObject[prop], partialObject[prop]);
} else {
extObject[prop] = partialObject[prop];
}
}
}
_update_extension_object(extensionObject, partialObject);
}
UAVariable.prototype.updateExtensionObjectPartial = function (partialExtensionObject) {
var self = this;
setExtensionObjectValue(self, partialExtensionObject);
return self.$extensionObject;
};
UAVariable.prototype.incrementExtensionObjectPartial = function (path) {
var self = this;
if (typeof path === "string") {
path = path.split(".");
}
assert(path instanceof Array);
var extensionObject = this.constructExtensionObjectFromComponents();
var i;
// read partial value
var partialData = {};
var p = partialData;
for (i = 0; i < path.length - 1; i++) {
name = path[i];
p[name] = {};
p = p[name];
}
name = path[path.length - 1];
p[name] = 0;
var c1 = partialData;
var c2 = extensionObject;
var name;
for (i = 0; i < path.length - 1; i++) {
name = path[i];
c1 = partialData[name];
c2 = extensionObject[name];
}
name = path[path.length - 1];
c1[name] = c2[name];
c1[name] += 1;
//xx console.log(partialData);
setExtensionObjectValue(self, partialData);
};
UAVariable.prototype.constructExtensionObjectFromComponents = function () {
return this.readValue().value.value;
};
UAVariable.prototype.handle_semantic_changed = function () {
var variable = this;
variable.semantic_version = variable.semantic_version + 1;
variable.emit("semantic_changed");
};
exports.UAVariable = UAVariable;
require("./data_access/ua_variable_data_access");
require("./historical_access/ua_variable_history");
The NodeOPCUA API