refacto: decouple parser and listener

cmd/salt-exporter/main.go

@@ -12,7 +12,9 @@ import (
 
 	"github.com/kpetremann/salt-exporter/internal/logging"
 	"github.com/kpetremann/salt-exporter/internal/metrics"
-	"github.com/kpetremann/salt-exporter/pkg/events"
+	events "github.com/kpetremann/salt-exporter/pkg/event"
+	"github.com/kpetremann/salt-exporter/pkg/listener"
+	"github.com/kpetremann/salt-exporter/pkg/parser"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/rs/zerolog/log"
 )
@@ -84,9 +86,10 @@ func main() {
 	eventChan := make(chan events.SaltEvent)
 
 	// listen and expose metric
-	eventListener := events.NewEventListener(ctx, eventChan)
+	parser := parser.NewEventParser(false)
+	eventListener := listener.NewEventListener(ctx, parser, eventChan)
 
-	go eventListener.ListenEvents(false)
+	go eventListener.ListenEvents()
 	go metrics.ExposeMetrics(ctx, eventChan, metricsConfig)
 
 	// start http server

cmd/salt-live/main.go

@@ -9,7 +9,9 @@ import (
 	"syscall"
 
 	"github.com/kpetremann/salt-exporter/internal/tui"
-	"github.com/kpetremann/salt-exporter/pkg/events"
+	"github.com/kpetremann/salt-exporter/pkg/event"
+	"github.com/kpetremann/salt-exporter/pkg/listener"
+	"github.com/kpetremann/salt-exporter/pkg/parser"
 	"github.com/rs/zerolog/log"
 
 	tea "github.com/charmbracelet/bubbletea"
@@ -47,9 +49,10 @@ func main() {
 	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
 	defer stop()
 
-	eventChan := make(chan events.SaltEvent, *bufferSize)
-	eventListener := events.NewEventListener(ctx, eventChan)
-	go eventListener.ListenEvents(true)
+	eventChan := make(chan event.SaltEvent, *bufferSize)
+	parser := parser.NewEventParser(true)
+	eventListener := listener.NewEventListener(ctx, parser, eventChan)
+	go eventListener.ListenEvents()
 
 	p := tea.NewProgram(tui.NewModel(eventChan, *maxItems, *filter), tea.WithMouseCellMotion())
 	if _, err := p.Run(); err != nil {

internal/metrics/metrics.go

@@ -6,7 +6,7 @@ import (
 	"time"
 
 	"github.com/kpetremann/salt-exporter/internal/filters"
-	"github.com/kpetremann/salt-exporter/pkg/events"
+	events "github.com/kpetremann/salt-exporter/pkg/event"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	"github.com/rs/zerolog/log"

internal/tui/item.go

@@ -3,13 +3,13 @@ package tui
 import (
 	"fmt"
 
-	"github.com/kpetremann/salt-exporter/pkg/events"
+	"github.com/kpetremann/salt-exporter/pkg/event"
 )
 
 type item struct {
 	title       string
 	description string
-	event       events.SaltEvent
+	event       event.SaltEvent
 	datetime    string
 	sender      string
 	state       string

internal/tui/tui.go

@@ -10,7 +10,7 @@ import (
 	teaViewport "github.com/charmbracelet/bubbles/viewport"
 	tea "github.com/charmbracelet/bubbletea"
 	"github.com/charmbracelet/lipgloss"
-	"github.com/kpetremann/salt-exporter/pkg/events"
+	"github.com/kpetremann/salt-exporter/pkg/event"
 )
 
 const theme = "solarized-dark"
@@ -28,7 +28,7 @@ type model struct {
 	eventList      teaList.Model
 	itemsBuffer    []teaList.Item
 	rawView        teaViewport.Model
-	eventChan      <-chan events.SaltEvent
+	eventChan      <-chan event.SaltEvent
 	hardFilter     string
 	keys           *keyMap
 	sideInfos      string
@@ -40,7 +40,7 @@ type model struct {
 	wordWrap       bool
 }
 
-func NewModel(eventChan <-chan events.SaltEvent, maxItems int, filter string) model {
+func NewModel(eventChan <-chan event.SaltEvent, maxItems int, filter string) model {
 	var listKeys = defaultKeyMap()
 
 	list := teaList.NewDefaultDelegate()

pkg/events/events.go → pkg/event/event.go

@@ -1,11 +1,9 @@
-package events
+package event
 
 import (
 	"encoding/json"
 	"errors"
-	"strings"
 
-	"github.com/rs/zerolog/log"
 	"github.com/vmihailenco/msgpack/v5"
 	"gopkg.in/yaml.v3"
 )
@@ -115,44 +113,3 @@ func (e *SaltEvent) ExtractState() string {
 	}
 	return ""
 }
-
-// ParseEvent parses a salt event
-//
-// Once parsed, the message is sent to the eventChan channel.
-// KeepRawBody is used to keep the raw body of the event.
-func ParseEvent(message map[string]interface{}, eventChan chan<- SaltEvent, keepRawBody bool) {
-	body := string(message["body"].([]byte))
-	lines := strings.SplitN(body, "\n\n", 2)
-
-	tag := lines[0]
-	if !(strings.HasPrefix(tag, "salt/job") || strings.HasPrefix(tag, "salt/run")) {
-		return
-	}
-	log.Debug().Str("tag", tag).Msg("new event")
-
-	// Extract job type from the tag
-	job_type := strings.Split(tag, "/")[3]
-
-	// Parse message body
-	byteResult := []byte(lines[1])
-	event := SaltEvent{Tag: tag, Type: job_type}
-
-	if keepRawBody {
-		event.RawBody = byteResult
-	}
-
-	if err := msgpack.Unmarshal(byteResult, &event.Data); err != nil {
-		log.Warn().Str("error", err.Error()).Str("tag", tag).Msg("decoding_failure")
-		return
-	}
-
-	event.TargetNumber = len(event.Data.Minions)
-	event.IsScheduleJob = event.Data.Schedule != ""
-
-	// A runner are executed on the master but they do not provide their ID in the event
-	if strings.HasPrefix(tag, "salt/run") && event.Data.Id == "" {
-		event.Data.Id = "master"
-	}
-
-	eventChan <- event
-}

pkg/event/event_test.go

@@ -0,0 +1,99 @@
+package event_test
+
+import (
+	"testing"
+
+	"github.com/kpetremann/salt-exporter/pkg/event"
+)
+
+func getNewStateEvent() event.SaltEvent {
+	return event.SaltEvent{
+		Tag:          "salt/job/20220630000f000000000/new",
+		Type:         "new",
+		TargetNumber: 1,
+		Data: event.EventData{
+			Timestamp: "2022-06-30T00:00:00.000000",
+			Fun:       "state.sls",
+			Arg:       []interface{}{"test"},
+			Jid:       "20220630000000000000",
+			Minions:   []string{"node1"},
+			Missing:   []string{},
+			Tgt:       "node1",
+			TgtType:   "glob",
+			User:      "salt_user",
+		},
+		IsScheduleJob: false,
+	}
+}
+
+func TestExtractState(t *testing.T) {
+	stateSls := getNewStateEvent()
+
+	stateSlsFunArg := getNewStateEvent()
+	stateSlsFunArg.Data.Arg = nil
+	stateSlsFunArg.Data.FunArgs = []interface{}{"test", map[string]bool{"dry_run": true}}
+
+	stateSlsFunArgMap := getNewStateEvent()
+	stateSlsFunArgMap.Data.Arg = nil
+	stateSlsFunArgMap.Data.FunArgs = []interface{}{map[string]interface{}{"mods": "test", "dry_run": true}}
+
+	stateApplyArg := getNewStateEvent()
+	stateApplyArg.Data.Fun = "state.apply"
+
+	stateApplyHighstate := getNewStateEvent()
+	stateApplyHighstate.Data.Fun = "state.apply"
+	stateApplyHighstate.Data.Arg = nil
+
+	stateHighstate := getNewStateEvent()
+	stateHighstate.Data.Fun = "state.highstate"
+	stateHighstate.Data.Arg = nil
+
+	tests := []struct {
+		name  string
+		event event.SaltEvent
+		want  string
+	}{
+		{
+			name:  "state via state.sls",
+			event: stateSls,
+			want:  "test",
+		},
+		{
+			name:  "state via state.sls args + kwargs",
+			event: stateSlsFunArg,
+			want:  "test",
+		},
+		{
+			name:  "state via state.sls kwargs only",
+			event: stateSlsFunArgMap,
+			want:  "test",
+		},
+		{
+			name:  "state via state.apply args only",
+			event: stateApplyArg,
+			want:  "test",
+		},
+		{
+			name:  "state via state.apply",
+			event: stateApplyArg,
+			want:  "test",
+		},
+		{
+			name:  "highstate via state.apply",
+			event: stateApplyHighstate,
+			want:  "highstate",
+		},
+		{
+			name:  "state.highstate",
+			event: stateHighstate,
+			want:  "highstate",
+		},
+	}
+
+	for _, test := range tests {
+		if res := test.event.ExtractState(); res != test.want {
+			t.Errorf("Mismatch for '%s', wants '%s' got '%s' ", test.name, test.want, res)
+		}
+	}
+
+}