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// OPCUA for Rust
// SPDX-License-Identifier: MPL-2.0
// Copyright (C) 2017-2022 Adam Lock
use std::{convert::TryFrom, sync::mpsc::SyncSender};
use opcua_core::supported_message::SupportedMessage;
use opcua_types::{
node_ids::{MethodId, ObjectId},
status_code::StatusCode,
*,
};
use crate::callbacks::OnSubscriptionNotification;
/// Enumeration used with Session::history_read()
pub enum HistoryReadAction {
ReadEventDetails(ReadEventDetails),
ReadRawModifiedDetails(ReadRawModifiedDetails),
ReadProcessedDetails(ReadProcessedDetails),
ReadAtTimeDetails(ReadAtTimeDetails),
}
/// Enumeration used with Session::history_update()
pub enum HistoryUpdateAction {
UpdateDataDetails(UpdateDataDetails),
UpdateStructureDataDetails(UpdateStructureDataDetails),
UpdateEventDetails(UpdateEventDetails),
DeleteRawModifiedDetails(DeleteRawModifiedDetails),
DeleteAtTimeDetails(DeleteAtTimeDetails),
DeleteEventDetails(DeleteEventDetails),
}
pub trait Service {
fn make_request_header(&self) -> RequestHeader;
/// Synchronously sends a request. The return value is the response to the request
fn send_request<T>(&self, request: T) -> Result<SupportedMessage, StatusCode>
where
T: Into<SupportedMessage>;
/// Asynchronously sends a request. The return value is the request handle of the request
fn async_send_request<T>(
&self,
request: T,
sender: Option<SyncSender<SupportedMessage>>,
) -> Result<u32, StatusCode>
where
T: Into<SupportedMessage>;
}
/// Discovery Service set
pub trait DiscoveryService: Service {
/// Sends a [`FindServersRequest`] to the server denoted by the discovery url.
///
/// See OPC UA Part 4 - Services 5.4.2 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `endpoint_url` - The network address that the Client used to access the Discovery Endpoint.
///
/// # Returns
///
/// * `Ok(Vec<ApplicationDescription>)` - A list of [`ApplicationDescription`] that meet criteria specified in the request.
/// * `Err(StatusCode)` - Request failed, status code is the reason for failure
///
/// [`FindServersRequest`]: ./struct.FindServersRequest.html
/// [`ApplicationDescription`]: ./struct.ApplicationDescription.html
///
fn find_servers<T>(&self, endpoint_url: T) -> Result<Vec<ApplicationDescription>, StatusCode>
where
T: Into<UAString>;
/// Obtain the list of endpoints supported by the server by sending it a [`GetEndpointsRequest`].
///
/// See OPC UA Part 4 - Services 5.4.4 for complete description of the service and error responses.
///
/// # Returns
///
/// * `Ok(Vec<EndpointDescription>)` - A list of endpoints supported by the server
/// * `Err(StatusCode)` - Request failed, status code is the reason for failure
///
/// [`GetEndpointsRequest`]: ./struct.GetEndpointsRequest.html
///
fn get_endpoints(&self) -> Result<Vec<EndpointDescription>, StatusCode>;
/// This function is used by servers that wish to register themselves with a discovery server.
/// i.e. one server is the client to another server. The server sends a [`RegisterServerRequest`]
/// to the discovery server to register itself. Servers are expected to re-register themselves periodically
/// with the discovery server, with a maximum of 10 minute intervals.
///
/// See OPC UA Part 4 - Services 5.4.5 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `server` - The server to register
///
/// # Returns
///
/// * `Ok(())` - Success
/// * `Err(StatusCode)` - Request failed, status code is the reason for failure
///
/// [`RegisterServerRequest`]: ./struct.RegisterServerRequest.html
///
fn register_server(&self, server: RegisteredServer) -> Result<(), StatusCode>;
}
/// SecureChannel Service set
pub trait SecureChannelService: Service {
/// Sends an [`OpenSecureChannelRequest`] to the server
///
///
/// See OPC UA Part 4 - Services 5.5.2 for complete description of the service and error responses.
/// # Returns
///
/// * `Ok(())` - Success
/// * `Err(StatusCode)` - Request failed, status code is the reason for failure
///
/// [`OpenSecureChannelRequest`]: ./struct.OpenSecureChannelRequest.html
///
fn open_secure_channel(&self) -> Result<(), StatusCode>;
/// Sends a [`CloseSecureChannelRequest`] to the server which will cause the server to drop
/// the connection.
///
/// See OPC UA Part 4 - Services 5.5.3 for complete description of the service and error responses.
///
/// # Returns
///
/// * `Ok(())` - Success
/// * `Err(StatusCode)` - Request failed, status code is the reason for failure
///
/// [`CloseSecureChannelRequest`]: ./struct.CloseSecureChannelRequest.html
///
fn close_secure_channel(&self) -> Result<(), StatusCode>;
}
/// Session Service set
pub trait SessionService: Service {
/// Sends a [`CreateSessionRequest`] to the server, returning the session id of the created
/// session. Internally, the session will store the authentication token which is used for requests
/// subsequent to this call.
///
/// See OPC UA Part 4 - Services 5.6.2 for complete description of the service and error responses.
///
/// # Returns
///
/// * `Ok(NodeId)` - Success, session id
/// * `Err(StatusCode)` - Request failed, status code is the reason for failure
///
/// [`CreateSessionRequest`]: ./struct.CreateSessionRequest.html
///
fn create_session(&self) -> Result<NodeId, StatusCode>;
/// Sends an [`ActivateSessionRequest`] to the server to activate this session
///
/// See OPC UA Part 4 - Services 5.6.3 for complete description of the service and error responses.
///
/// # Returns
///
/// * `Ok(())` - Success
/// * `Err(StatusCode)` - Request failed, status code is the reason for failure
///
/// [`ActivateSessionRequest`]: ./struct.ActivateSessionRequest.html
///
fn activate_session(&self) -> Result<(), StatusCode>;
/// Cancels an outstanding service request by sending a [`CancelRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.6.5 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `request_handle` - Handle to the outstanding request to be cancelled.
///
/// # Returns
///
/// * `Ok(u32)` - Success, number of cancelled requests
/// * `Err(StatusCode)` - Request failed, status code is the reason for failure
///
/// [`CancelRequest`]: ./struct.CancelRequest.html
///
fn cancel(&self, request_handle: IntegerId) -> Result<u32, StatusCode>;
}
/// NodeManagement Service set
pub trait NodeManagementService: Service {
/// Add nodes by sending a [`AddNodesRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.7.2 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `nodes_to_add` - A list of [`AddNodesItem`] to be added to the server.
///
/// # Returns
///
/// * `Ok(Vec<AddNodesResult>)` - A list of [`AddNodesResult`] corresponding to each add node operation.
/// * `Err(StatusCode)` - Status code reason for failure.
///
/// [`AddNodesRequest`]: ./struct.AddNodesRequest.html
/// [`AddNodesItem`]: ./struct.AddNodesItem.html
/// [`AddNodesResult`]: ./struct.AddNodesResult.html
///
fn add_nodes(&self, nodes_to_add: &[AddNodesItem]) -> Result<Vec<AddNodesResult>, StatusCode>;
/// Add references by sending a [`AddReferencesRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.7.3 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `references_to_add` - A list of [`AddReferencesItem`] to be sent to the server.
///
/// # Returns
///
/// * `Ok(Vec<StatusCode>)` - A list of `StatusCode` corresponding to each add reference operation.
/// * `Err(StatusCode)` - Status code reason for failure.
///
/// [`AddReferencesRequest`]: ./struct.AddReferencesRequest.html
/// [`AddReferencesItem`]: ./struct.AddReferencesItem.html
///
fn add_references(
&self,
references_to_add: &[AddReferencesItem],
) -> Result<Vec<StatusCode>, StatusCode>;
/// Delete nodes by sending a [`DeleteNodesRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.7.4 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `nodes_to_delete` - A list of [`DeleteNodesItem`] to be sent to the server.
///
/// # Returns
///
/// * `Ok(Vec<StatusCode>)` - A list of `StatusCode` corresponding to each delete node operation.
/// * `Err(StatusCode)` - Status code reason for failure.
///
/// [`DeleteNodesRequest`]: ./struct.DeleteNodesRequest.html
/// [`DeleteNodesItem`]: ./struct.DeleteNodesItem.html
///
fn delete_nodes(
&self,
nodes_to_delete: &[DeleteNodesItem],
) -> Result<Vec<StatusCode>, StatusCode>;
/// Delete references by sending a [`DeleteReferencesRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.7.5 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `nodes_to_delete` - A list of [`DeleteReferencesItem`] to be sent to the server.
///
/// # Returns
///
/// * `Ok(Vec<StatusCode>)` - A list of `StatusCode` corresponding to each delete node operation.
/// * `Err(StatusCode)` - Status code reason for failure.
///
/// [`DeleteReferencesRequest`]: ./struct.DeleteReferencesRequest.html
/// [`DeleteReferencesItem`]: ./struct.DeleteReferencesItem.html
///
fn delete_references(
&self,
references_to_delete: &[DeleteReferencesItem],
) -> Result<Vec<StatusCode>, StatusCode>;
}
/// View Service set
pub trait ViewService: Service {
/// Discover the references to the specified nodes by sending a [`BrowseRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.8.2 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `nodes_to_browse` - A list of [`BrowseDescription`] describing nodes to browse.
///
/// # Returns
///
/// * `Ok(Option<Vec<BrowseResult>)` - A list [`BrowseResult`] corresponding to each node to browse. A browse result
/// may contain a continuation point, for use with `browse_next()`.
/// * `Err(StatusCode)` - Request failed, status code is the reason for failure
///
/// [`BrowseRequest`]: ./struct.BrowseRequest.html
/// [`BrowseDescription`]: ./struct.BrowseDescription.html
/// [`BrowseResult`]: ./struct.BrowseResult.html
///
fn browse(
&self,
nodes_to_browse: &[BrowseDescription],
) -> Result<Option<Vec<BrowseResult>>, StatusCode>;
/// Continue to discover references to nodes by sending continuation points in a [`BrowseNextRequest`]
/// to the server. This function may have to be called repeatedly to process the initial query.
///
/// See OPC UA Part 4 - Services 5.8.3 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `release_continuation_points` - Flag indicating if the continuation points should be released by the server
/// * `continuation_points` - A list of [`BrowseDescription`] continuation points
///
/// # Returns
///
/// * `Ok(Option<Vec<BrowseResult>)` - A list [`BrowseResult`] corresponding to each node to browse. A browse result
/// may contain a continuation point, for use with `browse_next()`.
/// * `Err(StatusCode)` - Request failed, status code is the reason for failure
///
/// [`BrowseRequest`]: ./struct.BrowseRequest.html
/// [`BrowseNextRequest`]: ./struct.BrowseNextRequest.html
/// [`BrowseResult`]: ./struct.BrowseResult.html
///
fn browse_next(
&self,
release_continuation_points: bool,
continuation_points: &[ByteString],
) -> Result<Option<Vec<BrowseResult>>, StatusCode>;
/// Translate browse paths to NodeIds by sending a [`TranslateBrowsePathsToNodeIdsRequest`] request to the Server
/// Each [`BrowsePath`] is constructed of a starting node and a `RelativePath`. The specified starting node
/// identifies the node from which the RelativePath is based. The RelativePath contains a sequence of
/// ReferenceTypes and BrowseNames.
///
/// See OPC UA Part 4 - Services 5.8.4 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `browse_paths` - A list of [`BrowsePath`] node + relative path for the server to look up
///
/// # Returns
///
/// * `Ok(Vec<BrowsePathResult>>)` - List of [`BrowsePathResult`] for the list of browse
/// paths. The size and order of the list matches the size and order of the `browse_paths`
/// parameter.
/// * `Err(StatusCode)` - Request failed, status code is the reason for failure
///
/// [`TranslateBrowsePathsToNodeIdsRequest`]: ./struct.TranslateBrowsePathsToNodeIdsRequest.html
/// [`BrowsePath`]: ./struct.BrowsePath.html
/// [`BrowsePathResult`]: ./struct.BrowsePathResult.html
fn translate_browse_paths_to_node_ids(
&self,
browse_paths: &[BrowsePath],
) -> Result<Vec<BrowsePathResult>, StatusCode>;
/// Register nodes on the server by sending a [`RegisterNodesRequest`]. The purpose of this
/// call is server-dependent but allows a client to ask a server to create nodes which are
/// otherwise expensive to set up or maintain, e.g. nodes attached to hardware.
///
/// See OPC UA Part 4 - Services 5.8.5 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `nodes_to_register` - A list of [`NodeId`] nodes for the server to register
///
/// # Returns
///
/// * `Ok(Vec<NodeId>)` - A list of [`NodeId`] corresponding to size and order of the input. The
/// server may return an alias for the input `NodeId`
/// * `Err(StatusCode)` - Request failed, status code is the reason for failure
///
/// [`RegisterNodesRequest`]: ./struct.RegisterNodesRequest.html
/// [`NodeId`]: ./struct.NodeId.html
fn register_nodes(&self, nodes_to_register: &[NodeId]) -> Result<Vec<NodeId>, StatusCode>;
/// Unregister nodes on the server by sending a [`UnregisterNodesRequest`]. This indicates to
/// the server that the client relinquishes any need for these nodes. The server will ignore
/// unregistered nodes.
///
/// See OPC UA Part 4 - Services 5.8.5 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `nodes_to_unregister` - A list of [`NodeId`] nodes for the server to unregister
///
/// # Returns
///
/// * `Ok(())` - Request succeeded, server ignores invalid nodes
/// * `Err(StatusCode)` - Request failed, status code is the reason for failure
///
/// [`UnregisterNodesRequest`]: ./struct.UnregisterNodesRequest.html
/// [`NodeId`]: ./struct.NodeId.html
///
fn unregister_nodes(&self, nodes_to_unregister: &[NodeId]) -> Result<(), StatusCode>;
}
/// Attribute Service set
pub trait AttributeService: Service {
/// Reads the value of nodes by sending a [`ReadRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.10.2 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `nodes_to_read` - A list of [`ReadValueId`] to be read by the server.
/// * `timestamps_to_return` - The [`TimestampsToReturn`] for each node, Both, Server, Source or None
/// * `max_age` - The maximum age of value to read in milliseconds. Read the service description
/// for details. Basically it will attempt to read a value within the age range or
/// attempt to read a new value. If 0 the server will attempt to read a new value from the datasource.
/// If set to `i32::MAX` or greater, the server shall attempt to get a cached value.
///
/// # Returns
///
/// * `Ok(Vec<DataValue>)` - A list of [`DataValue`] corresponding to each read operation.
/// * `Err(StatusCode)` - Status code reason for failure.
///
/// [`ReadRequest`]: ./struct.ReadRequest.html
/// [`ReadValueId`]: ./struct.ReadValueId.html
/// [`DataValue`]: ./struct.DataValue.html
///
fn read(
&self,
nodes_to_read: &[ReadValueId],
timestamps_to_return: TimestampsToReturn,
max_age: f64,
) -> Result<Vec<DataValue>, StatusCode>;
/// Reads historical values or events of one or more nodes. The caller is expected to provide
/// a HistoryReadAction enum which must be one of the following:
///
/// * HistoryReadAction::ReadEventDetails
/// * HistoryReadAction::ReadRawModifiedDetails
/// * HistoryReadAction::ReadProcessedDetails
/// * HistoryReadAction::ReadAtTimeDetails
///
/// See OPC UA Part 4 - Services 5.10.3 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `history_read_details` - A history read operation encoded in an `ExtensionObject`.
/// * `timestamps_to_return` - Enumeration of which timestamps to return.
/// * `release_continuation_points` - Flag indicating whether to release the continuation point for the operation.
/// * `nodes_to_read` - The list of `HistoryReadValueId` of the nodes to apply the history read operation to.
///
/// # Returns
///
/// * `Ok(Vec<HistoryReadResult>)` - A list of `HistoryReadResult` results corresponding to history read operation.
/// * `Err(StatusCode)` - Status code reason for failure.
///
fn history_read(
&self,
history_read_details: HistoryReadAction,
timestamps_to_return: TimestampsToReturn,
release_continuation_points: bool,
nodes_to_read: &[HistoryReadValueId],
) -> Result<Vec<HistoryReadResult>, StatusCode>;
/// Writes values to nodes by sending a [`WriteRequest`] to the server. Note that some servers may reject DataValues
/// containing source or server timestamps.
///
/// See OPC UA Part 4 - Services 5.10.4 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `nodes_to_write` - A list of [`WriteValue`] to be sent to the server.
///
/// # Returns
///
/// * `Ok(Vec<StatusCode>)` - A list of `StatusCode` results corresponding to each write operation.
/// * `Err(StatusCode)` - Status code reason for failure.
///
/// [`WriteRequest`]: ./struct.WriteRequest.html
/// [`WriteValue`]: ./struct.WriteValue.html
///
fn write(&self, nodes_to_write: &[WriteValue]) -> Result<Vec<StatusCode>, StatusCode>;
/// Updates historical values. The caller is expected to provide one or more history update operations
/// in a slice of HistoryUpdateAction enums which are one of the following:
///
/// * UpdateDataDetails
/// * UpdateStructureDataDetails
/// * UpdateEventDetails
/// * DeleteRawModifiedDetails
/// * DeleteAtTimeDetails
/// * DeleteEventDetails
///
/// See OPC UA Part 4 - Services 5.10.5 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `history_update_details` - A list of history update operations each encoded as an `ExtensionObject`.
///
/// # Returns
///
/// * `Ok(Vec<ClientHistoryUpdateResult>)` - A list of `ClientHistoryUpdateResult` results corresponding to history update operation.
/// * `Err(StatusCode)` - Status code reason for failure.
///
fn history_update(
&self,
history_update_details: &[HistoryUpdateAction],
) -> Result<Vec<HistoryUpdateResult>, StatusCode>;
}
/// Method Service set
pub trait MethodService: Service {
/// Calls a single method on an object on the server by sending a [`CallRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.11.2 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `method` - The method to call. Note this function takes anything that can be turned into
/// a [`CallMethodRequest`] which includes a (`NodeId`, `NodeId`, `Option<Vec<Variant>>`)
/// which refers to the object id, method id, and input arguments respectively.
///
/// # Returns
///
/// * `Ok(CallMethodResult)` - A `[CallMethodResult]` for the Method call.
/// * `Err(StatusCode)` - Status code reason for failure.
///
/// [`CallRequest`]: ./struct.CallRequest.html
/// [`CallMethodRequest`]: ./struct.CallMethodRequest.html
/// [`CallMethodResult`]: ./struct.CallMethodResult.html
///
fn call<T>(&self, method: T) -> Result<CallMethodResult, StatusCode>
where
T: Into<CallMethodRequest>;
/// Calls GetMonitoredItems via call_method(), putting a sane interface on the input / output.
///
/// # Arguments
///
/// * `subscription_id` - Server allocated identifier for the subscription to return monitored items for.
///
/// # Returns
///
/// * `Ok((Vec<u32>, Vec<u32>))` - Result for call, consisting a list of (monitored_item_id, client_handle)
/// * `Err(StatusCode)` - Status code reason for failure.
///
fn call_get_monitored_items(
&self,
subscription_id: u32,
) -> Result<(Vec<u32>, Vec<u32>), StatusCode> {
let args = Some(vec![Variant::from(subscription_id)]);
let object_id: NodeId = ObjectId::Server.into();
let method_id: NodeId = MethodId::Server_GetMonitoredItems.into();
let request: CallMethodRequest = (object_id, method_id, args).into();
let response = self.call(request)?;
if let Some(mut result) = response.output_arguments {
if result.len() == 2 {
let server_handles = <Vec<u32>>::try_from(&result.remove(0))
.map_err(|_| StatusCode::BadUnexpectedError)?;
let client_handles = <Vec<u32>>::try_from(&result.remove(0))
.map_err(|_| StatusCode::BadUnexpectedError)?;
Ok((server_handles, client_handles))
} else {
error!("Expected a result with 2 args and didn't get it.");
Err(StatusCode::BadUnexpectedError)
}
} else {
error!("Expected a result and didn't get it.");
Err(StatusCode::BadUnexpectedError)
}
}
}
////////////////////////////////////////////////////////////////////////////////////////////////
// MonitoredItem Service set
////////////////////////////////////////////////////////////////////////////////////////////////
pub trait MonitoredItemService: Service {
/// Creates monitored items on a subscription by sending a [`CreateMonitoredItemsRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.12.2 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `subscription_id` - The Server-assigned identifier for the Subscription that will report Notifications for this MonitoredItem
/// * `timestamps_to_return` - An enumeration that specifies the timestamp Attributes to be transmitted for each MonitoredItem.
/// * `items_to_create` - A list of [`MonitoredItemCreateRequest`] to be created and assigned to the specified Subscription.
///
/// # Returns
///
/// * `Ok(Vec<MonitoredItemCreateResult>)` - A list of [`MonitoredItemCreateResult`] corresponding to the items to create.
/// The size and order of the list matches the size and order of the `items_to_create` request parameter.
/// * `Err(StatusCode)` - Status code reason for failure
///
/// [`CreateMonitoredItemsRequest`]: ./struct.CreateMonitoredItemsRequest.html
/// [`MonitoredItemCreateRequest`]: ./struct.MonitoredItemCreateRequest.html
/// [`MonitoredItemCreateResult`]: ./struct.MonitoredItemCreateResult.html
///
fn create_monitored_items(
&self,
subscription_id: u32,
timestamps_to_return: TimestampsToReturn,
items_to_create: &[MonitoredItemCreateRequest],
) -> Result<Vec<MonitoredItemCreateResult>, StatusCode>;
/// Modifies monitored items on a subscription by sending a [`ModifyMonitoredItemsRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.12.3 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `subscription_id` - The Server-assigned identifier for the Subscription that will report Notifications for this MonitoredItem.
/// * `timestamps_to_return` - An enumeration that specifies the timestamp Attributes to be transmitted for each MonitoredItem.
/// * `items_to_modify` - The list of [`MonitoredItemModifyRequest`] to modify.
///
/// # Returns
///
/// * `Ok(Vec<MonitoredItemModifyResult>)` - A list of [`MonitoredItemModifyResult`] corresponding to the MonitoredItems to modify.
/// The size and order of the list matches the size and order of the `items_to_modify` request parameter.
/// * `Err(StatusCode)` - Status code reason for failure.
///
/// [`ModifyMonitoredItemsRequest`]: ./struct.ModifyMonitoredItemsRequest.html
/// [`MonitoredItemModifyRequest`]: ./struct.MonitoredItemModifyRequest.html
/// [`MonitoredItemModifyResult`]: ./struct.MonitoredItemModifyResult.html
///
fn modify_monitored_items(
&self,
subscription_id: u32,
timestamps_to_return: TimestampsToReturn,
items_to_modify: &[MonitoredItemModifyRequest],
) -> Result<Vec<MonitoredItemModifyResult>, StatusCode>;
/// Sets the monitoring mode on one or more monitored items by sending a [`SetMonitoringModeRequest`]
/// to the server.
///
/// See OPC UA Part 4 - Services 5.12.4 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `subscription_id` - the subscription identifier containing the monitored items to be modified.
/// * `monitoring_mode` - the monitored mode to apply to the monitored items
/// * `monitored_item_ids` - the monitored items to be modified
///
/// # Returns
///
/// * `Ok(Vec<StatusCode>)` - Individual result for each monitored item.
/// * `Err(StatusCode)` - Status code reason for failure.
///
/// [`SetMonitoringModeRequest`]: ./struct.SetMonitoringModeRequest.html
///
fn set_monitoring_mode(
&self,
subscription_id: u32,
monitoring_mode: MonitoringMode,
monitored_item_ids: &[u32],
) -> Result<Vec<StatusCode>, StatusCode>;
/// Sets a monitored item so it becomes the trigger that causes other monitored items to send
/// change events in the same update. Sends a [`SetTriggeringRequest`] to the server.
/// Note that `items_to_remove` is applied before `items_to_add`.
///
/// See OPC UA Part 4 - Services 5.12.5 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `subscription_id` - the subscription identifier containing the monitored item to be used as the trigger.
/// * `monitored_item_id` - the monitored item that is the trigger.
/// * `links_to_add` - zero or more items to be added to the monitored item's triggering list.
/// * `items_to_remove` - zero or more items to be removed from the monitored item's triggering list.
///
/// # Returns
///
/// * `Ok((Option<Vec<StatusCode>>, Option<Vec<StatusCode>>))` - Individual result for each item added / removed for the SetTriggering call.
/// * `Err(StatusCode)` - Status code reason for failure.
///
/// [`SetTriggeringRequest`]: ./struct.SetTriggeringRequest.html
///
fn set_triggering(
&self,
subscription_id: u32,
triggering_item_id: u32,
links_to_add: &[u32],
links_to_remove: &[u32],
) -> Result<(Option<Vec<StatusCode>>, Option<Vec<StatusCode>>), StatusCode>;
/// Deletes monitored items from a subscription by sending a [`DeleteMonitoredItemsRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.12.6 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `subscription_id` - The Server-assigned identifier for the Subscription that will report Notifications for this MonitoredItem.
/// * `items_to_delete` - List of Server-assigned ids for the MonitoredItems to be deleted.
///
/// # Returns
///
/// * `Ok(Vec<StatusCode>)` - List of StatusCodes for the MonitoredItems to delete. The size and
/// order of the list matches the size and order of the `items_to_delete` request parameter.
/// * `Err(StatusCode)` - Status code reason for failure.
///
/// [`DeleteMonitoredItemsRequest`]: ./struct.DeleteMonitoredItemsRequest.html
///
fn delete_monitored_items(
&self,
subscription_id: u32,
items_to_delete: &[u32],
) -> Result<Vec<StatusCode>, StatusCode>;
}
////////////////////////////////////////////////////////////////////////////////////////////////
// Subscription Service set
////////////////////////////////////////////////////////////////////////////////////////////////
pub trait SubscriptionService: Service {
/// Create a subscription by sending a [`CreateSubscriptionRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.13.2 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `publishing_interval` - The requested publishing interval defines the cyclic rate that
/// the Subscription is being requested to return Notifications to the Client. This interval
/// is expressed in milliseconds. This interval is represented by the publishing timer in the
/// Subscription state table. The negotiated value for this parameter returned in the
/// response is used as the default sampling interval for MonitoredItems assigned to this
/// Subscription. If the requested value is 0 or negative, the server shall revise with the
/// fastest supported publishing interval in milliseconds.
/// * `lifetime_count` - Requested lifetime count. The lifetime count shall be a minimum of
/// three times the keep keep-alive count. When the publishing timer has expired this
/// number of times without a Publish request being available to send a NotificationMessage,
/// then the Subscription shall be deleted by the Server.
/// * `max_keep_alive_count` - Requested maximum keep-alive count. When the publishing timer has
/// expired this number of times without requiring any NotificationMessage to be sent, the
/// Subscription sends a keep-alive Message to the Client. The negotiated value for this
/// parameter is returned in the response. If the requested value is 0, the server shall
/// revise with the smallest supported keep-alive count.
/// * `max_notifications_per_publish` - The maximum number of notifications that the Client
/// wishes to receive in a single Publish response. A value of zero indicates that there is
/// no limit. The number of notifications per Publish is the sum of monitoredItems in
/// the DataChangeNotification and events in the EventNotificationList.
/// * `priority` - Indicates the relative priority of the Subscription. When more than one
/// Subscription needs to send Notifications, the Server should de-queue a Publish request
/// to the Subscription with the highest priority number. For Subscriptions with equal
/// priority the Server should de-queue Publish requests in a round-robin fashion.
/// A Client that does not require special priority settings should set this value to zero.
/// * `publishing_enabled` - A boolean parameter with the following values - `true` publishing
/// is enabled for the Subscription, `false`, publishing is disabled for the Subscription.
/// The value of this parameter does not affect the value of the monitoring mode Attribute of
/// MonitoredItems.
///
/// # Returns
///
/// * `Ok(u32)` - identifier for new subscription
/// * `Err(StatusCode)` - Status code reason for failure
///
/// [`CreateSubscriptionRequest`]: ./struct.CreateSubscriptionRequest.html
///
fn create_subscription<CB>(
&self,
publishing_interval: f64,
lifetime_count: u32,
max_keep_alive_count: u32,
max_notifications_per_publish: u32,
priority: u8,
publishing_enabled: bool,
callback: CB,
) -> Result<u32, StatusCode>
where
CB: OnSubscriptionNotification + Send + Sync + 'static;
/// Modifies a subscription by sending a [`ModifySubscriptionRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.13.3 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `subscription_id` - subscription identifier returned from `create_subscription`.
///
/// See `create_subscription` for description of other parameters
///
/// # Returns
///
/// * `Ok(())` - Success
/// * `Err(StatusCode)` - Request failed, status code is the reason for failure
///
/// [`ModifySubscriptionRequest`]: ./struct.ModifySubscriptionRequest.html
///
fn modify_subscription(
&self,
subscription_id: u32,
publishing_interval: f64,
lifetime_count: u32,
max_keep_alive_count: u32,
max_notifications_per_publish: u32,
priority: u8,
) -> Result<(), StatusCode>;
/// Changes the publishing mode of subscriptions by sending a [`SetPublishingModeRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.13.4 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `subscription_ids` - one or more subscription identifiers.
/// * `publishing_enabled` - A boolean parameter with the following values - `true` publishing
/// is enabled for the Subscriptions, `false`, publishing is disabled for the Subscriptions.
///
/// # Returns
///
/// * `Ok(Vec<StatusCode>)` - Service return code for the action for each id, `Good` or `BadSubscriptionIdInvalid`
/// * `Err(StatusCode)` - Status code reason for failure
///
/// [`SetPublishingModeRequest`]: ./struct.SetPublishingModeRequest.html
///
fn set_publishing_mode(
&self,
subscription_ids: &[u32],
publishing_enabled: bool,
) -> Result<Vec<StatusCode>, StatusCode>;
/// Transfers Subscriptions and their MonitoredItems from one Session to another. For example,
/// a Client may need to reopen a Session and then transfer its Subscriptions to that Session.
/// It may also be used by one Client to take over a Subscription from another Client by
/// transferring the Subscription to its Session.
///
/// See OPC UA Part 4 - Services 5.13.7 for complete description of the service and error responses.
///
/// * `subscription_ids` - one or more subscription identifiers.
/// * `send_initial_values` - A boolean parameter with the following values - `true` the first
/// publish response shall contain the current values of all monitored items in the subscription,
/// `false`, the first publish response shall contain only the value changes since the last
/// publish response was sent.
///
/// # Returns
///
/// * `Ok(Vec<TransferResult>)` - The [`TransferResult`] for each transfer subscription.
/// * `Err(StatusCode)` - Status code reason for failure
///
/// [`TransferSubscriptionsRequest`]: ./struct.TransferSubscriptionsRequest.html
/// [`TransferResult`]: ./struct.TransferResult.html
///
fn transfer_subscriptions(
&self,
subscription_ids: &[u32],
send_initial_values: bool,
) -> Result<Vec<TransferResult>, StatusCode>;
/// Deletes a subscription by sending a [`DeleteSubscriptionsRequest`] to the server.
///
/// See OPC UA Part 4 - Services 5.13.8 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `subscription_id` - subscription identifier returned from `create_subscription`.
///
/// # Returns
///
/// * `Ok(StatusCode)` - Service return code for the delete action, `Good` or `BadSubscriptionIdInvalid`
/// * `Err(StatusCode)` - Status code reason for failure
///
/// [`DeleteSubscriptionsRequest`]: ./struct.DeleteSubscriptionsRequest.html
///
fn delete_subscription(&self, subscription_id: u32) -> Result<StatusCode, StatusCode>;
/// Deletes subscriptions by sending a [`DeleteSubscriptionsRequest`] to the server with the list
/// of subscriptions to delete.
///
/// See OPC UA Part 4 - Services 5.13.8 for complete description of the service and error responses.
///
/// # Arguments
///
/// * `subscription_ids` - List of subscription identifiers to delete.
///
/// # Returns
///
/// * `Ok(Vec<StatusCode>)` - List of result for delete action on each id, `Good` or `BadSubscriptionIdInvalid`
/// The size and order of the list matches the size and order of the input.
/// * `Err(StatusCode)` - Status code reason for failure
///
/// [`DeleteSubscriptionsRequest`]: ./struct.DeleteSubscriptionsRequest.html
///
fn delete_subscriptions(&self, subscription_ids: &[u32])
-> Result<Vec<StatusCode>, StatusCode>;
}