Refactoring fake component and shipper codebases (#2378)

* Refactoring fake component and shipper codebases

* Fixing imports

* Silence the linter

* Make go build happy

magefile.go

@@ -240,14 +240,17 @@ func (Build) Clean() {
 
 // TestBinaries build the required binaries for the test suite.
 func (Build) TestBinaries() error {
-	p := filepath.Join("pkg", "component", "fake")
+	wd, _ := os.Getwd()
+	p := filepath.Join(wd, "pkg", "component", "fake")
 	for _, name := range []string{"component", "shipper"} {
 		binary := name
 		if runtime.GOOS == "windows" {
 			binary += ".exe"
 		}
-		outputName := filepath.Join(p, name, binary)
-		err := RunGo("build", "-o", outputName, filepath.Join("github.com/elastic/elastic-agent", p, name, "..."))
+
+		fakeDir := filepath.Join(p, name)
+		outputName := filepath.Join(fakeDir, binary)
+		err := RunGo("build", "-o", outputName, filepath.Join(fakeDir))
 		if err != nil {
 			return err
 		}

pkg/component/fake/component/comp/actions.go

@@ -0,0 +1,113 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License;
+// you may not use this file except in compliance with the Elastic License.
+
+package comp
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"time"
+
+	"github.com/rs/zerolog"
+
+	"github.com/elastic/elastic-agent-client/v7/pkg/client"
+)
+
+type stateSetterAction struct {
+	input *fakeInput
+}
+
+type sendEventAction struct {
+	input *fakeInput
+}
+
+type killAction struct {
+	logger zerolog.Logger
+}
+
+func (s *stateSetterAction) Name() string {
+	return "set_state"
+}
+
+func (s *stateSetterAction) Execute(_ context.Context, params map[string]interface{}) (map[string]interface{}, error) {
+	s.input.logger.Trace().Msg("executing set_state action")
+	state, stateMsg, err := getStateFromMap(params)
+	if err != nil {
+		return nil, err
+	}
+	s.input.state = state
+	s.input.stateMsg = stateMsg
+	s.input.logger.Debug().Str("state", s.input.state.String()).Str("message", s.input.stateMsg).Msg("updating unit state")
+	_ = s.input.unit.UpdateState(s.input.state, s.input.stateMsg, nil)
+	return nil, nil
+}
+
+func (s *sendEventAction) Name() string {
+	return "send_event"
+}
+
+func (s *sendEventAction) Execute(_ context.Context, params map[string]interface{}) (map[string]interface{}, error) {
+	const (
+		timeoutField   = "timeout"
+		timeoutDefault = 3 * time.Second
+	)
+
+	s.input.logger.Trace().Msg("executing send_event action")
+
+	// timeout is taken from the action to define the timeout
+	timeout := timeoutDefault
+	if timeoutRaw, ok := params[timeoutField]; ok {
+		if timeoutStr, ok := timeoutRaw.(string); ok {
+			dur, err := time.ParseDuration(timeoutStr)
+			if err != nil {
+				return nil, fmt.Errorf("failed to parse timeout duration: %w", err)
+			}
+			timeout = dur
+		}
+	}
+
+	if s.input.manager.output != nil {
+		output, ok := s.input.manager.output.(*fakeShipperOutput)
+		if !ok {
+			return nil, fmt.Errorf("output is not fake-shipper output, cannot send event, got type %T", s.input.manager.output)
+		}
+		err := output.sendEvent(params, timeout)
+		if err != nil {
+			return nil, err
+		}
+		return nil, nil
+	}
+	return nil, errors.New("no output configured to send event")
+}
+
+func (s *killAction) Name() string {
+	return "kill"
+}
+
+func (s *killAction) Execute(_ context.Context, _ map[string]interface{}) (map[string]interface{}, error) {
+	s.logger.Trace().Msg("executing kill action")
+	os.Exit(1)
+	return nil, nil
+}
+
+func newRunningUnit(logger zerolog.Logger, manager *StateManager, unit *client.Unit) (runningUnit, error) {
+	_, logLevel, config := unit.Expected()
+	if config.Type == "" {
+		return nil, fmt.Errorf("unit config type empty")
+	}
+	if unit.Type() == client.UnitTypeOutput {
+		switch config.Type {
+		case fakeShipper:
+			return newFakeShipperOutput(logger, logLevel, unit, config)
+		}
+		return nil, fmt.Errorf("unknown output unit config type: %s", config.Type)
+	}
+	switch config.Type {
+	case Fake:
+		return newFakeInput(logger, logLevel, manager, unit, config)
+	}
+	return nil, fmt.Errorf("unknown input unit config type: %s", config.Type)
+}