[golang] implement automation loop and add contract accepting

golang/pkg/agent/init.go

@@ -0,0 +1,60 @@
+package agent
+
+import (
+	"errors"
+	"fmt"
+	"log/slog"
+
+	"git.adyxax.org/adyxax/spacetraders/golang/pkg/api"
+	"git.adyxax.org/adyxax/spacetraders/golang/pkg/model"
+)
+
+func (a *agent) init() error {
+	token, err := a.db.GetToken()
+	if err == nil && token != "" {
+		a.client.SetToken(token)
+		var agent *model.Agent
+		agent, err = a.client.MyAgent() // we need err to carry over outside this block
+		if err == nil {
+			slog.Info("agent", "/my/agent", agent)
+		} else {
+			slog.Info("failed to get agent, handling server reset", "err", err)
+			a.db.Reset()
+		}
+	}
+	if err != nil || token == "" {
+		// No token or invalid token (since we carry over the error of MyAgent() in the previous if), we need to register
+		accountToken := a.getenv("SPACETRADERS_ACCOUNT_TOKEN")
+		if accountToken == "" {
+			return fmt.Errorf("the SPACETRADERS_ACCOUNT_TOKEN environment variable is not set")
+		}
+		a.client.SetToken(accountToken)
+		agent := a.getenv("SPACETRADERS_AGENT")
+		if agent == "" {
+			return fmt.Errorf("the SPACETRADERS_AGENT environment variable is not set")
+		}
+		faction := a.getenv("SPACETRADERS_FACTION")
+		if faction == "" {
+			return fmt.Errorf("the SPACETRADERS_FACTION environment variable is not set")
+		}
+		register, err := a.client.Register(faction, agent)
+		if err != nil {
+			apiError := &api.APIError{}
+			if errors.As(err, &apiError) {
+				switch apiError.Code {
+				case 4111: // Agent symbol has already been claimed
+					return fmt.Errorf("failed to register and failed to get a token from the database: someone stole our agent's callsign: %w", err)
+				default:
+					return fmt.Errorf("failed to register: %w", err)
+				}
+			} else {
+				return fmt.Errorf("failed to register with an invalid apiError: %w", err)
+			}
+		}
+		a.client.SetToken(register.Token)
+		if err := a.db.SaveToken(register.Token); err != nil {
+			return fmt.Errorf("failed to save token %s after a successful registration: %w", register.Token, err)
+		}
+	}
+	return nil
+}