opcua

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 Go to latest Published: Feb 10, 2021 License: MIT Imports: 24 Imported by: 0

README

Artwork by Ashley McNamara - Inspired by Renee French - Taken from https://gopherize.me by Mat Ryer

OPCUA

A native Go implementation of the OPC/UA Binary Protocol.

You need go1.13 or higher. We test with the current and previous Go version.

CircleCI GitHub GoDoc GolangCI License Version

Quickstart

# make sure you have go1.13 or higher

# install library
go get -u github.com/arvindh123/opcua

# get current date and time 'ns=0;i=2258'
go run examples/datetime/datetime.go -endpoint opc.tcp://localhost:4840

# read the server version
go run examples/read/read.go -endpoint opc.tcp://localhost:4840 -node 'ns=0;i=2261'

# get the current date time using different security and authentication modes
go run examples/crypto/*.go -endpoint opc.tcp://localhost:4840 -cert path/to/cert.pem -key path/to/key.pem -sec-policy Basic256 -sec-mode SignAndEncrypt

# checkout examples/ for more examples...

Sponsors

The gopcua project is sponsored by the following organizations by supporting the active committers to the project:

Northvolt evosoft

Users

We would also like to list organizations which use gopcua in production. Please open a PR to include your logo below.

Disclaimer

We are still actively working on this project and the APIs will change.

We have started to tag the code to support go modules and reproducible builds but there is still no guarantee of API stability.

However, you can safely assume that we are aiming to make the APIs as stable as possible. :)

The Current State was moved to the Wiki.

Your Help is Appreciated

If you are looking for ways to contribute you can

  • test the high-level client against real OPC/UA servers
  • add functions to the client or tell us which functions you need for gopcua to be useful
  • work on the security layer, server and other components
  • and last but not least, file issues, review code and write/update documentation

Also, if the library is already useful please spread the word as a motivation.

Authors

The Gopcua Team.

If you need to get in touch with us directly you may find us on Keybase.io but try to create an issue first.

Supported Features

The current focus is on the OPC UA Binary protocol over TCP. No other protocols are supported at this point.

Categories Features Supported Notes
Encoding OPC UA Binary Yes
OPC UA JSON not planned
OPC UA XML not planned
Transport UA-TCP UA-SC UA Binary Yes
OPC UA HTTPS not planned
SOAP-HTTP WS-SC UA Binary not planned
SOAP-HTTP WS-SC UA XML not planned
SOAP-HTTP WS-SC UA XML-UA Binary not planned
Encryption None Yes
Basic128Rsa15 Yes
Basic256 Yes
Basic256Sha256 Yes
Authentication Anonymous Yes
User Name Password Yes
X509 Certificate Yes

Services

The current set of supported services is only for the high-level client.

Service Set Service Supported Notes
Discovery Service Set FindServers
FindServersOnNetwork
GetEndpoints Yes
RegisterServer
RegisterServer2
Secure Channel Service Set OpenSecureChannel Yes
CloseSecureChannel Yes
Session Service Set CreateSession Yes
CloseSession Yes
ActivateSession Yes
Cancel
Node Management Service Set AddNodes
AddReferences
DeleteNodes
DeleteReferences
View Service Set Browse Yes
BrowseNext Yes
TranslateBrowsePathsToNodeIds
RegisterNodes Yes
UnregisterNodes Yes
Query Service Set QueryFirst
QueryNext
Attribute Service Set Read Yes
Write Yes
HistoryRead Yes
HistoryUpdate
Method Service Set Call Yes
MonitoredItems Service Set CreateMonitoredItems Yes
DeleteMonitoredItems Yes
ModifyMonitoredItems
SetMonitoringMode
SetTriggering
Subscription Service Set CreateSubscription Yes
ModifySubscription
SetPublishingMode
Publish Yes
Republish
DeleteSubscriptions Yes
TransferSubscriptions

License

MIT

Documentation

Overview

Package opcua provides easy and painless encoding/decoding of OPC UA protocol in pure Golang.

Index

Constants

View Source 
const (
	DefaultSubscriptionMaxNotificationsPerPublish = 10000
	DefaultSubscriptionLifetimeCount              = 10000
	DefaultSubscriptionMaxKeepAliveCount          = 3000
	DefaultSubscriptionInterval                   = 100 * time.Millisecond
	DefaultSubscriptionPriority                   = 0
)

Variables

This section is empty.

Functions

func ApplyConfig 

func ApplyConfig(opts ...Option) (*uasc.Config, *uasc.SessionConfig)

ApplyConfig applies the config options to the default configuration. todo(fs): Can we find a better name?

func DefaultClientConfig 

func DefaultClientConfig() *uasc.Config

DefaultClientConfig returns the default configuration for a client to establish a secure channel.

func DefaultSessionConfig 

func DefaultSessionConfig() *uasc.SessionConfig

DefaultSessionConfig returns the default configuration for a client to establish a session.

func GetEndpoints 

func GetEndpoints(endpoint string) ([]*ua.EndpointDescription, error)

GetEndpoints returns the available endpoint descriptions for the server.

func NewMonitoredItemCreateRequestWithDefaults 

func NewMonitoredItemCreateRequestWithDefaults(nodeID *ua.NodeID, attributeID ua.AttributeID, clientHandle uint32) *ua.MonitoredItemCreateRequest

func SelectEndpoint 

func SelectEndpoint(endpoints []*ua.EndpointDescription, policy string, mode ua.MessageSecurityMode) *ua.EndpointDescription

SelectEndpoint returns the endpoint with the highest security level which matches security policy and security mode. policy and mode can be omitted so that only one of them has to match. todo(fs): should this function return an error?

Types

type Client 

type Client struct {
	// contains filtered or unexported fields
}

Client is a high-level client for an OPC/UA server. It establishes a secure channel and a session.

func NewClient 

func NewClient(endpoint string, opts ...Option) *Client

NewClient creates a new Client.

When no options are provided the new client is created from DefaultClientConfig() and DefaultSessionConfig(). If no authentication method is configured, a UserIdentityToken for anonymous authentication will be set. See #Client.CreateSession for details.

To modify configuration you can provide any number of Options as opts. See #Option for details.

https://godoc.org/github.com/arvindh123/opcua#Option

func (*Client) ActivateSession 

func (c *Client) ActivateSession(s *Session) error

ActivateSession activates the session and associates it with the client. If the client already has a session it will be closed. To retain the current session call DetachSession.

See Part 4, 5.6.3

func (*Client) Browse 

func (c *Client) Browse(req *ua.BrowseRequest) (*ua.BrowseResponse, error)

Browse executes a synchronous browse request.

func (*Client) BrowseNext 

func (c *Client) BrowseNext(req *ua.BrowseNextRequest) (*ua.BrowseNextResponse, error)

BrowseNext executes a synchronous browse request.

func (*Client) Call 

func (c *Client) Call(req *ua.CallMethodRequest) (*ua.CallMethodResult, error)

Call executes a synchronous call request for a single method.

func (*Client) Close 

func (c *Client) Close() error

Close closes the session and the secure channel.

func (*Client) CloseSession 

func (c *Client) CloseSession() error

CloseSession closes the current session.

See Part 4, 5.6.4

func (*Client) Connect 

func (c *Client) Connect(ctx context.Context) (err error)

Connect establishes a secure channel and creates a new session.

func (*Client) CreateSession 

func (c *Client) CreateSession(cfg *uasc.SessionConfig) (*Session, error)

CreateSession creates a new session which is not yet activated and not associated with the client. Call ActivateSession to both activate and associate the session with the client.

If no UserIdentityToken is given explicitly before calling CreateSesion, it automatically sets anonymous identity token with the same PolicyID that the server sent in Create Session Response. The default PolicyID "Anonymous" wii be set if it's missing in response.

See Part 4, 5.6.2

func (*Client) DetachSession 

func (c *Client) DetachSession() (*Session, error)

DetachSession removes the session from the client without closing it. The caller is responsible to close or re-activate the session. If the client does not have an active session the function returns no error.

func (*Client) Dial 

func (c *Client) Dial(ctx context.Context) error

Dial establishes a secure channel.

func (*Client) GetEndpoints 

func (c *Client) GetEndpoints() (*ua.GetEndpointsResponse, error)

func (*Client) HistoryReadRawModified 

func (c *Client) HistoryReadRawModified(nodes []*ua.HistoryReadValueID, details *ua.ReadRawModifiedDetails) (*ua.HistoryReadResponse, error)

func (*Client) Node 

func (c *Client) Node(id *ua.NodeID) *Node

Node returns a node object which accesses its attributes through this client connection.

func (*Client) Read 

func (c *Client) Read(req *ua.ReadRequest) (*ua.ReadResponse, error)

Read executes a synchronous read request.

By default, the function requests the value of the nodes in the default encoding of the server.

func (*Client) RegisterNodes 

func (c *Client) RegisterNodes(req *ua.RegisterNodesRequest) (*ua.RegisterNodesResponse, error)

RegisterNodes registers node ids for more efficient reads. Part 4, Section 5.8.5

func (*Client) Send 

func (c *Client) Send(req ua.Request, h func(interface{}) error) error

Send sends the request via the secure channel and registers a handler for the response. If the client has an active session it injects the authentication token.

func (*Client) Session 

func (c *Client) Session() *Session

Session returns the active session.

func (*Client) State 

func (c *Client) State() ConnState

func (*Client) Subscribe 

func (c *Client) Subscribe(params *SubscriptionParameters, notifyCh chan *PublishNotificationData) (*Subscription, error)

Subscribe creates a Subscription with given parameters. Parameters that have not been set are set to their default values. See opcua.DefaultSubscription* constants

func (*Client) SubscriptionIDs 

func (c *Client) SubscriptionIDs() []uint32

SubscriptionIDs gets a list of subscriptionIDs

func (*Client) UnregisterNodes 

func (c *Client) UnregisterNodes(req *ua.UnregisterNodesRequest) (*ua.UnregisterNodesResponse, error)

UnregisterNodes unregisters node ids previously registered with RegisterNodes. Part 4, Section 5.8.6

func (*Client) Write 

func (c *Client) Write(req *ua.WriteRequest) (*ua.WriteResponse, error)

Write executes a synchronous write request.

type ConnState 

type ConnState uint8

ConnState is the ua client connection state 

const (
	// Closed, the Connection is currently closed
	Closed ConnState = iota
	// Connected, the Connection is currently connected
	Connected
	// Connecting, the Connection is currently connecting to a server for the first time
	Connecting
	// Disconnected, the Connection is currently disconnected
	Disconnected
	// Reconnecting, the Connection is currently attempting to reconnect to a server it was previously connected to
	Reconnecting
)

type InvalidResponseTypeError 

type InvalidResponseTypeError struct {
	// contains filtered or unexported fields
}

func (InvalidResponseTypeError) Error 

func (e InvalidResponseTypeError) Error() string

type Node 

type Node struct {
	// ID is the node id of the node.
	ID *ua.NodeID
	// contains filtered or unexported fields
}

Node is a high-level object to interact with a node in the address space. It provides common convenience functions to access and manipulate the common attributes of a node.

func (*Node) AccessLevel 

func (n *Node) AccessLevel() (ua.AccessLevelType, error)

AccessLevel returns the access level of the node. The returned value is a mask where multiple values can be set, e.g. read and write.

func (*Node) Attribute 

func (n *Node) Attribute(attrID ua.AttributeID) (*ua.Variant, error)

Attribute returns the attribute of the node. with the given id.

func (*Node) Attributes 

func (n *Node) Attributes(attrID ...ua.AttributeID) ([]*ua.DataValue, error)

func (*Node) BrowseName 

func (n *Node) BrowseName() (*ua.QualifiedName, error)

BrowseName returns the browse name of the node.

func (*Node) Children 

func (n *Node) Children(refs uint32, mask ua.NodeClass) ([]*Node, error)

func (*Node) Description 

func (n *Node) Description() (*ua.LocalizedText, error)

Description returns the description of the node.

func (*Node) DisplayName 

func (n *Node) DisplayName() (*ua.LocalizedText, error)

DisplayName returns the display name of the node.

func (*Node) HasAccessLevel 

func (n *Node) HasAccessLevel(mask ua.AccessLevelType) (bool, error)

HasAccessLevel returns true if all bits from mask are set in the access level mask of the node.

func (*Node) HasUserAccessLevel 

func (n *Node) HasUserAccessLevel(mask ua.AccessLevelType) (bool, error)

HasUserAccessLevel returns true if all bits from mask are set in the user access level mask of the node.

func (*Node) NodeClass 

func (n *Node) NodeClass() (ua.NodeClass, error)

NodeClass returns the node class attribute.

func (*Node) ReferencedNodes 

func (n *Node) ReferencedNodes(refs uint32, dir ua.BrowseDirection, mask ua.NodeClass, includeSubtypes bool) ([]*Node, error)

func (*Node) References 

func (n *Node) References(refType uint32, dir ua.BrowseDirection, mask ua.NodeClass, includeSubtypes bool) ([]*ua.ReferenceDescription, error)

References returns all references for the node. todo(fs): this is not complete since it only returns the todo(fs): top-level reference at this point.

func (*Node) String 

func (n *Node) String() string

func (*Node) TranslateBrowsePathInNamespaceToNodeID 

func (n *Node) TranslateBrowsePathInNamespaceToNodeID(ns uint16, browsePath string) (*ua.NodeID, error)

TranslateBrowsePathInNamespaceToNodeID translates a browseName to a NodeID within the same namespace.

func (*Node) TranslateBrowsePathsToNodeIDs 

func (n *Node) TranslateBrowsePathsToNodeIDs(pathNames []*ua.QualifiedName) (*ua.NodeID, error)

TranslateBrowsePathsToNodeIDs translates an array of browseName segments to NodeIDs.

func (*Node) UserAccessLevel 

func (n *Node) UserAccessLevel() (ua.AccessLevelType, error)

UserAccessLevel returns the access level of the node.

func (*Node) Value 

func (n *Node) Value() (*ua.Variant, error)

Value returns the value of the node.

type Option 

type Option func(*uasc.Config, *uasc.SessionConfig)

Option is an option function type to modify the configuration.

func ApplicationName 

func ApplicationName(s string) Option

ApplicationName sets the application name in the session configuration.

func ApplicationURI 

func ApplicationURI(s string) Option

ApplicationURI sets the application uri in the session configuration.

func AuthAnonymous 

func AuthAnonymous() Option

AuthAnonymous sets the client's authentication X509 certificate Note: PolicyID still needs to be set outside of this method, typically through the SecurityFromEndpoint() Option

func AuthCertificate 

func AuthCertificate(cert []byte) Option

AuthCertificate sets the client's authentication X509 certificate Note: PolicyID still needs to be set outside of this method, typically through the SecurityFromEndpoint() Option

func AuthIssuedToken 

func AuthIssuedToken(tokenData []byte) Option

AuthIssuedToken sets the client's authentication data based on an externally-issued token Note: PolicyID still needs to be set outside of this method, typically through the SecurityFromEndpoint() Option

func AuthPolicyID 

func AuthPolicyID(policy string) Option

AuthPolicyID sets the policy ID of the user identity token Note: This should only be called if you know the exact policy ID the server is expecting. Most callers should use SecurityFromEndpoint as it automatically finds the policyID todo(fs): Should we make 'policy' an option to the other todo(fs): AuthXXX methods since this approach requires context todo(fs): and ordering?

func AuthUsername 

func AuthUsername(user, pass string) Option

AuthUsername sets the client's authentication username and password Note: PolicyID still needs to be set outside of this method, typically through the SecurityFromEndpoint() Option

func AutoReconnect 

func AutoReconnect(b bool) Option

AutoReconnect sets the auto reconnect state of the secure channel.

func Certificate 

func Certificate(cert []byte) Option

Certificate sets the client X509 certificate in the secure channel configuration. It also detects and sets the ApplicationURI from the URI within the certificate.

func CertificateFile 

func CertificateFile(filename string) Option

Certificate sets the client X509 certificate in the secure channel configuration from the PEM or DER encoded file. It also detects and sets the ApplicationURI from the URI within the certificate.

func Lifetime 

func Lifetime(d time.Duration) Option

Lifetime sets the lifetime of the secure channel in milliseconds.

func Locales 

func Locales(locale ...string) Option

Locales sets the locales in the session configuration.

func PrivateKey 

func PrivateKey(key *rsa.PrivateKey) Option

PrivateKey sets the RSA private key in the secure channel configuration.

func PrivateKeyFile 

func PrivateKeyFile(filename string) Option

PrivateKeyFile sets the RSA private key in the secure channel configuration from a PEM or DER encoded file.

func ProductURI 

func ProductURI(s string) Option

ProductURI sets the product uri in the session configuration.

func RandomRequestID 

func RandomRequestID() Option

RandomRequestID assigns a random initial request id.

func ReconnectInterval 

func ReconnectInterval(d time.Duration) Option

ReconnectInterval is interval duration between each reconnection attempt.

func RemoteCertificate 

func RemoteCertificate(cert []byte) Option

RemoteCertificate sets the server certificate.

func RemoteCertificateFile 

func RemoteCertificateFile(filename string) Option

RemoteCertificateFile sets the server certificate from the file in PEM or DER encoding.

func RequestTimeout 

func RequestTimeout(t time.Duration) Option

RequestTimeout sets the timeout for all requests over SecureChannel

func SecurityFromEndpoint 

func SecurityFromEndpoint(ep *ua.EndpointDescription, authType ua.UserTokenType) Option

SecurityFromEndpoint sets the server-related security parameters from a chosen endpoint (received from GetEndpoints())

func SecurityMode 

func SecurityMode(m ua.MessageSecurityMode) Option

SecurityMode sets the security mode for the secure channel.

func SecurityModeString 

func SecurityModeString(s string) Option

SecurityModeString sets the security mode for the secure channel. Valid values are "None", "Sign", and "SignAndEncrypt".

func SecurityPolicy 

func SecurityPolicy(s string) Option

SecurityPolicy sets the security policy uri for the secure channel.

func SessionName 

func SessionName(s string) Option

SessionName sets the name in the session configuration.

func SessionTimeout 

func SessionTimeout(d time.Duration) Option

SessionTimeout sets the timeout in the session configuration.

type PublishNotificationData 

type PublishNotificationData struct {
	SubscriptionID uint32
	Error          error
	Value          interface{}
}

type Server 

type Server struct {
	EndpointURL string
}

Server is a high-level OPC-UA Server

func (*Server) Close 

func (a *Server) Close() error

func (*Server) Open 

func (a *Server) Open() error

type Session 

type Session struct {
	// contains filtered or unexported fields
}

Session is a OPC/UA session as described in Part 4, 5.6.

type Subscription 

type Subscription struct {
	SubscriptionID            uint32
	RevisedPublishingInterval time.Duration
	RevisedLifetimeCount      uint32
	RevisedMaxKeepAliveCount  uint32
	Notifs                    chan *PublishNotificationData
	// contains filtered or unexported fields
}

func (*Subscription) Cancel 

func (s *Subscription) Cancel() error

Cancel stops the subscription and removes it from the client and the server.

func (*Subscription) Monitor 

func (s *Subscription) Monitor(ts ua.TimestampsToReturn, items ...*ua.MonitoredItemCreateRequest) (*ua.CreateMonitoredItemsResponse, error)

func (*Subscription) SetTriggering 

func (s *Subscription) SetTriggering(triggeringItemID uint32, add, remove []uint32) (*ua.SetTriggeringResponse, error)

SetTriggering sends a request to the server to add and/or remove triggering links from a triggering item. To add links from a triggering item to an item to report provide the server assigned ID(s) in the `add` argument. To remove links from a triggering item to an item to report provide the server assigned ID(s) in the `remove` argument.

func (*Subscription) Stats 

func (s *Subscription) Stats() (*ua.SubscriptionDiagnosticsDataType, error)

Stats returns a diagnostic struct with metadata about the current subscription

func (*Subscription) Unmonitor 

func (s *Subscription) Unmonitor(monitoredItemIDs ...uint32) (*ua.DeleteMonitoredItemsResponse, error)

type SubscriptionParameters 

type SubscriptionParameters struct {
	Interval                   time.Duration
	LifetimeCount              uint32
	MaxKeepAliveCount          uint32
	MaxNotificationsPerPublish uint32
	Priority                   uint8
}

Source Files

View all Source files

Directories

Path Synopsis
cmd
id
service
service/goname
status
Package debug provides functions for debug logging.
 Package debug provides functions for debug logging.
examples
accesslevel
browse
crypto
datetime
endpoints
Package main provides an example to query the available endpoints of a server.
 Package main provides an example to query the available endpoints of a server.
history-read
method
monitor
read
regread
server
subscribe
translate
trigger
udt
write
Package ua defines the structures, decoders and encoder for built-in data types described in Part 6 Section 5 Data encoding and for services in OPC UA Binary Protocol.
 Package ua defines the structures, decoders and encoder for built-in data types described in Part 6 Section 5 Data encoding and for services in OPC UA Binary Protocol.
Package uacp provides encoding/decoding and automated connection handling for the OPC UA Connection Protocol.
 Package uacp provides encoding/decoding and automated connection handling for the OPC UA Connection Protocol.
Package uapolicy implements the encryption, decryption, signing, and signature verifying algorithms for Security Policy profiles as defined in Part 7 of the OPC-UA specifications (version 1.04)
 Package uapolicy implements the encryption, decryption, signing, and signature verifying algorithms for Security Policy profiles as defined in Part 7 of the OPC-UA specifications (version 1.04)
Package uasc provides encoding/decoding and automated secure channel and session handling for OPC UA Secure Conversation.
 Package uasc provides encoding/decoding and automated secure channel and session handling for OPC UA Secure Conversation.

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