feat: enable worker process

internal/worker/queries.sql

@@ -0,0 +1,15 @@
+-- name: Ping :one
+SELECT 1;
+
+-- name: RegisterWorker :exec
+INSERT INTO worker_register (worker_id)
+VALUES (
+    $1
+);
+
+-- name: UpdateWorkerHeartbeat :exec
+UPDATE worker_register
+SET
+    heart_beat = now()
+WHERE
+    worker_id = $1;

internal/worker/repositories/db.go

@@ -0,0 +1,32 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.23.0
+
+package repositories
+
+import (
+	"context"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
+)
+
+type DBTX interface {
+	Exec(context.Context, string, ...interface{}) (pgconn.CommandTag, error)
+	Query(context.Context, string, ...interface{}) (pgx.Rows, error)
+	QueryRow(context.Context, string, ...interface{}) pgx.Row
+}
+
+func New(db DBTX) *Queries {
+	return &Queries{db: db}
+}
+
+type Queries struct {
+	db DBTX
+}
+
+func (q *Queries) WithTx(tx pgx.Tx) *Queries {
+	return &Queries{
+		db: tx,
+	}
+}

internal/worker/repositories/models.go

@@ -0,0 +1,15 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.23.0
+
+package repositories
+
+import (
+	"github.com/google/uuid"
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+type WorkerRegister struct {
+	WorkerID  uuid.UUID          `json:"worker_id"`
+	HeartBeat pgtype.Timestamptz `json:"heart_beat"`
+}

internal/worker/repositories/querier.go

@@ -0,0 +1,19 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.23.0
+
+package repositories
+
+import (
+	"context"
+
+	"github.com/google/uuid"
+)
+
+type Querier interface {
+	Ping(ctx context.Context) (int32, error)
+	RegisterWorker(ctx context.Context, workerID uuid.UUID) error
+	UpdateWorkerHeartbeat(ctx context.Context, workerID uuid.UUID) error
+}
+
+var _ Querier = (*Queries)(nil)

internal/worker/repositories/queries.sql.go

@@ -0,0 +1,48 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.23.0
+// source: queries.sql
+
+package repositories
+
+import (
+	"context"
+
+	"github.com/google/uuid"
+)
+
+const ping = `-- name: Ping :one
+SELECT 1
+`
+
+func (q *Queries) Ping(ctx context.Context) (int32, error) {
+	row := q.db.QueryRow(ctx, ping)
+	var column_1 int32
+	err := row.Scan(&column_1)
+	return column_1, err
+}
+
+const registerWorker = `-- name: RegisterWorker :exec
+INSERT INTO worker_register (worker_id)
+VALUES (
+    $1
+)
+`
+
+func (q *Queries) RegisterWorker(ctx context.Context, workerID uuid.UUID) error {
+	_, err := q.db.Exec(ctx, registerWorker, workerID)
+	return err
+}
+
+const updateWorkerHeartbeat = `-- name: UpdateWorkerHeartbeat :exec
+UPDATE worker_register
+SET
+    heart_beat = now()
+WHERE
+    worker_id = $1
+`
+
+func (q *Queries) UpdateWorkerHeartbeat(ctx context.Context, workerID uuid.UUID) error {
+	_, err := q.db.Exec(ctx, updateWorkerHeartbeat, workerID)
+	return err
+}

internal/worker/sqlc.yaml

@@ -7,10 +7,15 @@ sql:
       go:
         out: "repositories"
         package: "repositories"
-        sql_package: "sql/db"
+        sql_package: "pgx/v5"
         emit_json_tags: true
         emit_prepared_queries: true
         emit_interface: true
         emit_empty_slices: true
         emit_result_struct_pointers: true
         emit_params_struct_pointers: true
+        overrides:
+          - db_type: "uuid"
+            go_type:
+              import: "github.com/google/uuid"
+              type: "UUID"

internal/worker/worker.go

@@ -2,21 +2,90 @@ package worker
 
 import (
 	"context"
+	"fmt"
+	"log/slog"
+	"time"
 
+	"git.front.kjuulh.io/kjuulh/orbis/internal/worker/repositories"
 	"github.com/google/uuid"
+	"github.com/jackc/pgx/v5/pgxpool"
 )
 
+//go:generate sqlc generate
+
 type Worker struct {
 	workerID uuid.UUID
+
+	db     *pgxpool.Pool
+	logger *slog.Logger
 }
 
-func NewWorker() *Worker {
+func NewWorker(
+	db *pgxpool.Pool,
+	logger *slog.Logger,
+) *Worker {
 	return &Worker{
 		workerID: uuid.New(),
+		db:       db,
+		logger:   logger,
 	}
 }
 
 func (w *Worker) Setup(ctx context.Context) error {
+	repo := repositories.New(w.db)
+
+	if err := repo.RegisterWorker(ctx, w.workerID); err != nil {
+		return nil
+	}
+
+	return nil
+}
+
+func (w *Worker) Start(ctx context.Context) error {
+	heartBeatCtx, heartBeatCancel := context.WithCancel(context.Background())
+	go func() {
+		ticker := time.NewTicker(time.Second * 5)
+		errorCount := 0
+
+		for {
+			select {
+			case <-heartBeatCtx.Done():
+				return
+			case <-ticker.C:
+				if err := w.updateHeartBeat(heartBeatCtx); err != nil {
+					if errorCount >= 5 {
+						panic(fmt.Errorf("worker failed to register heartbeat for a long time, panicing..., err: %w", err))
+					}
+					errorCount += 1
+				} else {
+					errorCount = 0
+				}
+			}
+		}
+	}()
+
+	defer func() {
+		heartBeatCancel()
+	}()
+
+	for {
+		if err := w.processWorkQueue(ctx); err != nil {
+			// FIXME: dead letter item, right now we just log and continue
+
+			w.logger.WarnContext(ctx, "failed to handle work item", "error", err)
+		}
+	}
+}
+
+func (w *Worker) updateHeartBeat(ctx context.Context) error {
+	repo := repositories.New(w.db)
+
+	w.logger.DebugContext(ctx, "updating heartbeat", "time", time.Now())
+	return repo.UpdateWorkerHeartbeat(ctx, w.workerID)
+}
+
+func (w *Worker) processWorkQueue(_ context.Context) error {
+	time.Sleep(time.Second)
 
 	return nil
 }