mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-23 00:00:01 +01:00
85 lines
1.6 KiB
Go
85 lines
1.6 KiB
Go
/** Simple loopback node-type written in Go code.
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*
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* @author Steffen Vogel <post@steffenvogel.de>
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* @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
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* @license Apache 2.0
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*********************************************************************************/
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package nodes
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import (
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"encoding/json"
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"fmt"
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"git.rwth-aachen.de/acs/public/villas/node/go/pkg/errors"
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"git.rwth-aachen.de/acs/public/villas/node/go/pkg/nodes"
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)
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type Node struct {
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nodes.BaseNode
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channel chan []byte
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Config LoopbackConfig
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}
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type LoopbackConfig struct {
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nodes.NodeConfig
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Value int `json:"value"`
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}
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func NewNode() nodes.Node {
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return &Node{
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BaseNode: nodes.NewBaseNode(),
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channel: make(chan []byte, 1024),
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}
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}
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func (n *Node) Parse(c []byte) error {
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return json.Unmarshal(c, &n.Config)
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}
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func (n *Node) Check() error {
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return nil
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}
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func (n *Node) Prepare() error {
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return nil
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}
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func (n *Node) Start() error {
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return n.BaseNode.Start()
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}
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func (n *Node) Read() ([]byte, error) {
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select {
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case <-n.Stopped:
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return nil, errors.ErrEndOfFile
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case buf := <-n.channel:
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return buf, nil
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}
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}
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func (n *Node) Write(data []byte) error {
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n.channel <- data
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return nil
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}
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func (n *Node) PollFDs() ([]int, error) {
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return []int{}, nil
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}
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func (n *Node) NetemFDs() ([]int, error) {
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return []int{}, nil
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}
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func (n *Node) Details() string {
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return fmt.Sprintf("value=%d", n.Config.Value)
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}
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func init() {
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nodes.RegisterNodeType("go.loopback", "A loopback node implmented in Go", NewNode, nodes.NodeSupportsRead|nodes.NodeSupportsWrite|nodes.NodeHidden)
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}
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