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node_iterface.go
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node_iterface.go
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package acmelib
import (
"fmt"
"strings"
"golang.org/x/exp/slices"
)
// NodeInterface represents an interface between a [Bus] and a [Node].
type NodeInterface struct {
*entity
parentBus *Bus
messages *set[EntityID, *Message]
messageNames *set[string, EntityID]
messageIDs *set[MessageID, EntityID]
number int
node *Node
}
func newNodeInterface(number int, node *Node) *NodeInterface {
ni := &NodeInterface{
parentBus: nil,
messages: newSet[EntityID, *Message](),
messageNames: newSet[string, EntityID](),
messageIDs: newSet[MessageID, EntityID](),
number: number,
node: node,
}
ni.entity = newEntity(ni.setName(node.name), EntityKindNodeInterface)
return ni
}
func (ni *NodeInterface) setName(nodeName string) string {
return fmt.Sprintf("%s/int%d", nodeName, ni.number)
}
func (ni *NodeInterface) hasParentBus() bool {
return ni.parentBus != nil
}
func (ni *NodeInterface) errorf(err error) error {
nodeIntErr := &EntityError{
Kind: EntityKindNode,
EntityID: ni.entityID,
Name: ni.name,
Err: err,
}
if ni.hasParentBus() {
return ni.parentBus.errorf(nodeIntErr)
}
return nodeIntErr
}
func (ni *NodeInterface) stringify(b *strings.Builder, tabs int) {
ni.entity.stringify(b, tabs)
tabStr := getTabString(tabs)
b.WriteString(fmt.Sprintf("%snumber: %d\n", tabStr, ni.number))
b.WriteString(fmt.Sprintf("%snode:\n", tabStr))
ni.node.stringify(b, tabs+1)
if ni.messages.size() == 0 {
return
}
b.WriteString(fmt.Sprintf("%ssended_messages:\n", tabStr))
for _, msg := range ni.Messages() {
msg.stringify(b, tabs+1)
b.WriteRune('\n')
}
}
func (ni *NodeInterface) String() string {
builder := new(strings.Builder)
ni.stringify(builder, 0)
return builder.String()
}
func (ni *NodeInterface) verifyMessageName(name string) error {
err := ni.messageNames.verifyKeyUnique(name)
if err != nil {
return &NameError{
Name: name,
Err: err,
}
}
return nil
}
func (ni *NodeInterface) verifyMessageID(msgID MessageID) error {
err := ni.messageIDs.verifyKeyUnique(msgID)
if err != nil {
return &MessageIDError{
MessageID: msgID,
Err: err,
}
}
return nil
}
// AddMessage adds a [Message] that the [NodeInterface] can send.
//
// It returns an [ArgumentError] if the given message is nil or
// a [NameError]/[MessageIDError] if the message name/id is already used.
func (ni *NodeInterface) AddMessage(message *Message) error {
if message == nil {
return &ArgumentError{
Name: "message",
Err: ErrIsNil,
}
}
addMsgErr := &AddEntityError{
EntityID: message.entityID,
Name: message.name,
}
if err := ni.verifyMessageName(message.name); err != nil {
addMsgErr.Err = err
return ni.errorf(addMsgErr)
}
if !message.hasStaticCANID {
if err := ni.verifyMessageID(message.id); err != nil {
addMsgErr.Err = err
return ni.errorf(addMsgErr)
}
ni.messageIDs.add(message.id, message.entityID)
}
ni.messages.add(message.entityID, message)
ni.messageNames.add(message.name, message.entityID)
message.senderNodeInt = ni
return nil
}
// RemoveMessage removes a [Message] sent by the [NodeInterface].
//
// It returns an [ErrNotFound] if the given entity id does not match
// any message.
func (ni *NodeInterface) RemoveMessage(messageEntityID EntityID) error {
msg, err := ni.messages.getValue(messageEntityID)
if err != nil {
return ni.errorf(&RemoveEntityError{
EntityID: messageEntityID,
Err: err,
})
}
msg.senderNodeInt = nil
ni.messages.remove(messageEntityID)
ni.messageNames.remove(msg.name)
ni.messageIDs.remove(msg.id)
return nil
}
// RemoveAllMessages removes all the messages sent by the [NodeInterface].
func (ni *NodeInterface) RemoveAllMessages() {
for _, tmpMsg := range ni.messages.entries() {
tmpMsg.senderNodeInt = nil
}
ni.messages.clear()
ni.messageNames.clear()
ni.messageIDs.clear()
}
// GetMessageByName returns the [Message] with the given name.
//
// It returns an [ErrNotFound] wrapped by a [NameError]
// if the name does not match any message.
func (ni *NodeInterface) GetMessageByName(name string) (*Message, error) {
id, err := ni.messageNames.getValue(name)
if err != nil {
return nil, ni.errorf(&NameError{Err: err})
}
msg, err := ni.messages.getValue(id)
if err != nil {
panic(err)
}
return msg, nil
}
// Messages returns a slice of messages sended by the [NodeInterface].
func (ni *NodeInterface) Messages() []*Message {
msgSlice := ni.messages.getValues()
slices.SortFunc(msgSlice, func(a, b *Message) int {
return int(a.id) - int(b.id)
})
return msgSlice
}
// Node returns the [Node] that owns the [NodeInterface].
func (ni *NodeInterface) Node() *Node {
return ni.node
}
// ParentBus returns the [Bus] attached to the [NodeInterface].
func (ni *NodeInterface) ParentBus() *Bus {
return ni.parentBus
}
// Number returns the number of the [NodeInterface].
// The number is unique among all the interfaces within a [Node]
// and it cannot be manually assigned.
func (ni *NodeInterface) Number() int {
return ni.number
}