feat: track conversations inside connectors (#92)

* switch to observer pattern

Signed-off-by: mudler <mudler@localai.io>

* keep conversation history in telegram and slack

* generalize with conversation tracker

---------

Signed-off-by: mudler <mudler@localai.io>

services/connectors/conversationstracker.go

@@ -0,0 +1,75 @@
+package connectors
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/mudler/LocalAgent/pkg/xlog"
+	"github.com/sashabaranov/go-openai"
+)
+
+type TrackerKey interface{ ~int | ~int64 | ~string }
+
+type ConversationTracker[K TrackerKey] struct {
+	convMutex           sync.Mutex
+	currentconversation map[K][]openai.ChatCompletionMessage
+	lastMessageTime     map[K]time.Time
+	lastMessageDuration time.Duration
+}
+
+func NewConversationTracker[K TrackerKey](lastMessageDuration time.Duration) *ConversationTracker[K] {
+	return &ConversationTracker[K]{
+		lastMessageDuration: lastMessageDuration,
+		currentconversation: map[K][]openai.ChatCompletionMessage{},
+		lastMessageTime:     map[K]time.Time{},
+	}
+}
+
+func (c *ConversationTracker[K]) GetConversation(key K) []openai.ChatCompletionMessage {
+	// Lock the conversation mutex to update the conversation history
+	c.convMutex.Lock()
+	defer c.convMutex.Unlock()
+
+	// Clear up the conversation if the last message was sent more than lastMessageDuration ago
+	currentConv := []openai.ChatCompletionMessage{}
+	lastMessageTime := c.lastMessageTime[key]
+	if lastMessageTime.IsZero() {
+		lastMessageTime = time.Now()
+	}
+	if lastMessageTime.Add(c.lastMessageDuration).Before(time.Now()) {
+		currentConv = []openai.ChatCompletionMessage{}
+		c.lastMessageTime[key] = time.Now()
+		xlog.Debug("Conversation history does not exist for", "key", fmt.Sprintf("%v", key))
+	} else {
+		xlog.Debug("Conversation history exists for", "key", fmt.Sprintf("%v", key))
+		currentConv = append(currentConv, c.currentconversation[key]...)
+	}
+
+	// cleanup other conversations if older
+	for k := range c.currentconversation {
+		lastMessage, exists := c.lastMessageTime[k]
+		if !exists {
+			delete(c.currentconversation, k)
+			delete(c.lastMessageTime, k)
+			continue
+		}
+		if lastMessage.Add(c.lastMessageDuration).Before(time.Now()) {
+			xlog.Debug("Cleaning up conversation for", k)
+			delete(c.currentconversation, k)
+			delete(c.lastMessageTime, k)
+		}
+	}
+
+	return currentConv
+
+}
+
+func (c *ConversationTracker[K]) AddMessage(key K, message openai.ChatCompletionMessage) {
+	// Lock the conversation mutex to update the conversation history
+	c.convMutex.Lock()
+	defer c.convMutex.Unlock()
+
+	c.currentconversation[key] = append(c.currentconversation[key], message)
+	c.lastMessageTime[key] = time.Now()
+}