inital working metl

action-stdout.go

@@ -0,0 +1,99 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/google/uuid"
+)
+
+type ActionStdOut struct {
+	ActionID     uuid.UUID
+	OutputSchema *Schema
+	InputSchema  *Schema
+	Config       StdOutConfig
+	status       ActionStatus
+	bus          *Bus
+}
+
+type StdOutConfig struct {
+	ActionConfig
+	AddHeader bool
+}
+
+func NewStdOut(config StdOutConfig, b *Bus) (ActionStdOut, error) {
+	as := ActionStdOut{}
+	err := as.init(config, b)
+	if err != nil {
+		return ActionStdOut{}, err
+	}
+	return as, nil
+}
+
+func (s *ActionStdOut) init(config StdOutConfig, b *Bus) error {
+	if len(config.Inputs) <= 0 {
+		return errors.New(fmt.Sprintf("error no input schema defined. ActionID: %v", config.ActionID.String()))
+	}
+	s.InputSchema = config.Inputs[0].InputSchema
+	s.OutputSchema = config.OutputSchema
+	s.ActionID = config.ActionID
+	s.Config = config
+	s.status = ActionStatus{
+		State:        NotStarted,
+		HandledRows:  0,
+		ExpectedRows: -1,
+	}
+	s.bus = b
+	return nil
+}
+
+func (s *ActionStdOut) Run(contentRow ContentRow) error {
+	s.status.State = Running
+	if s.status.HandledRows == 0 && s.Config.AddHeader {
+		headerRowRaw := ""
+		for _, h := range s.Config.OutputSchema.Columns {
+			if strings.EqualFold(headerRowRaw, "") {
+				headerRowRaw = h.Name
+			} else {
+				headerRowRaw = headerRowRaw + "," + h.Name
+			}
+		}
+		fmt.Printf("%v\n", headerRowRaw)
+	}
+	fmt.Printf("%v\n", contentRow.Raw)
+	s.status.HandledRows = s.status.HandledRows + 1
+	if s.status.HandledRows == s.status.ExpectedRows {
+		s.status.State = Finished
+	}
+	return nil
+}
+
+func (s *ActionStdOut) publishRow(row ContentRow) error {
+	// TODO: decide on the method of transporting data to the next action
+	return s.bus.Run(s.ActionID, row)
+}
+
+func (s *ActionStdOut) publishErrorRow(row ContentRow) error {
+	// TODO: decide on the method of transporting data to the next action
+	return nil
+}
+
+func (s *ActionStdOut) Validate() error {
+	if len(s.Config.Inputs) <= 0 {
+		return errors.New(fmt.Sprintf("error no input schema defined. ActionID: %v", s.ActionID.String()))
+	}
+	return nil
+}
+
+func (s *ActionStdOut) GetActionID() uuid.UUID {
+	return s.ActionID
+}
+
+func (s *ActionStdOut) Status() ActionStatus {
+	return s.status
+}
+
+func (s *ActionStdOut) GetActionConfig() ActionConfig {
+	return s.Config.ActionConfig
+}