alpha version

workers/claude.go

@@ -0,0 +1,158 @@
+package workers
+
+import (
+	"context"
+	"errors"
+	"log/slog"
+	"sync/atomic"
+
+	"github.com/alex-savin/go-receipt-tracker/bus"
+	"github.com/alex-savin/go-receipt-tracker/config"
+	"github.com/alex-savin/go-receipt-tracker/utils"
+	"github.com/liushuangls/go-anthropic/v2"
+)
+
+type Claude struct {
+	id            string
+	model         string
+	opts          *config.Parser
+	client        *anthropic.Client
+	subscriptions map[string]chan bus.Event //
+	bus           *bus.Bus
+	log           *slog.Logger
+	cancel        context.CancelFunc //
+	end           uint32             // ensure the close methods are only called once
+}
+
+func NewClaude(cfg *config.Parser, b *bus.Bus) *Claude {
+
+	ai := &Claude{
+		id:            cfg.Type,  // "claude",
+		model:         cfg.Model, // "gpt-4o-mini"
+		opts:          cfg,
+		subscriptions: make(map[string]chan bus.Event),
+		bus:           b,
+	}
+
+	return ai
+}
+
+func (ai *Claude) ID() string {
+	return ai.id
+}
+
+func (ai *Claude) Type() string {
+	return "parser"
+}
+
+func (ai *Claude) Init(log *slog.Logger) error {
+	ai.client = anthropic.NewClient(ai.opts.ApiKey)
+	ai.log = log
+
+	return nil
+}
+
+func (ai *Claude) Serve() {
+	if atomic.LoadUint32(&ai.end) == 1 {
+		return
+	}
+
+	ai.subscribe("parser:" + ai.ID())
+	ai.subscribe("parser:*")
+
+	ctx, cancel := context.WithCancel(context.Background())
+	ai.cancel = cancel
+
+	go ai.eventLoop(ctx)
+}
+
+func (ai *Claude) OneTime() error {
+	return nil
+}
+
+func (ai *Claude) Stop() {
+}
+
+func (ai *Claude) Close() {
+}
+
+func (ai *Claude) subscribe(chn string) error {
+	s, err := ai.bus.Subscribe(chn, ai.Type()+":"+ai.ID())
+	if err != nil {
+		ai.log.Error("couldn't subscribe to a channel", "channel", chn, "error", err.Error())
+		return err
+	}
+	ai.subscriptions[chn] = s
+
+	return nil
+}
+
+// eventLoop loops forever
+func (ai *Claude) eventLoop(ctx context.Context) {
+	ai.log.Debug(ai.ID() + " communication event loop started")
+	defer ai.log.Debug(ai.ID() + " communication event loop halted")
+
+	for {
+		for chn, ch := range ai.subscriptions {
+			select {
+			case event := <-ch:
+				switch event.Payload.(type) {
+				case *bus.Message:
+					ai.log.Debug("got a new message to a channel", "channel", chn, "worker type", ai.Type(), "worker id", ai.ID())
+
+					msg := event.Payload.(*bus.Message)
+					res, err := ai.recognize(event.Payload.(*bus.Message).Image.Base64, event.Payload.(*bus.Message).Image.Type)
+					if err != nil {
+						ai.log.Error("got an error from parser ("+ai.ID()+")", "error", err)
+					}
+
+					msg.Image.Parsed[ai.ID()] = res
+					err = ai.bus.Publish("processor:receipt_add", msg)
+					if err != nil {
+						ai.log.Error("couldn't publish to a channel", "channel", "processor:receipt_add", "error", err.Error())
+					}
+				}
+			case <-ctx.Done():
+				ai.log.Info("stopping " + ai.ID() + " communication event loop")
+				return
+			}
+		}
+	}
+}
+
+func (ai *Claude) recognize(img, imgType string) (res string, err error) {
+	resp, err := ai.client.CreateMessages(context.Background(), anthropic.MessagesRequest{
+		Model: anthropic.ModelClaude3Opus20240229,
+		Messages: []anthropic.Message{
+			{
+				Role: anthropic.RoleUser,
+				Content: []anthropic.MessageContent{
+					anthropic.NewImageMessageContent(anthropic.MessageContentSource{
+						Type:      "base64",
+						MediaType: imgType,
+						Data:      img,
+					}),
+					anthropic.NewTextMessageContent(config.Request),
+				},
+			},
+		},
+		MaxTokens: 1000,
+	})
+	if err != nil {
+		var e *anthropic.APIError
+		if errors.As(err, &e) {
+			ai.log.Error("cannot recognize a receipt", "type", e.Type, "message", e.Message)
+		} else {
+			ai.log.Error("cannot recognize a receipt", "Messages error: %v\n", err)
+		}
+		return "", err
+	}
+	if !utils.IsJSON(*resp.Content[0].Text) {
+		ai.log.Error("Claude returned not valid JSON", "%+v", resp.Content[0].Text)
+		return "", err
+	}
+
+	ai.log.Debug("recognition result", "worker", ai.ID(), "output", resp.Content[0].Text)
+
+	return *resp.Content[0].Text, nil
+}