Manager: convert FetchWorkerTask() from gorm to sqlc

Ref: #104305

No functional changes

internal/manager/persistence/sqlc/query_task_scheduler.sql

@@ -47,6 +47,21 @@ WHERE TF.worker_id IS NULL -- Not failed by this worker before.
   AND tasks.type IN (sqlc.slice('supported_task_types'))
 ORDER BY jobs.priority DESC, tasks.priority DESC;
 
+-- name: FetchWorkerTask :one
+-- Find the currently-active task assigned to a Worker. If not found, find the last task this Worker worked on.
+SELECT
+  sqlc.embed(tasks),
+  sqlc.embed(jobs),
+  (tasks.status = @task_status_active AND jobs.status = @job_status_active) as is_active
+FROM tasks
+  INNER JOIN jobs ON tasks.job_id = jobs.id
+WHERE
+  tasks.worker_id = @worker_id
+ORDER BY
+  is_active DESC,
+  tasks.updated_at DESC
+LIMIT 1;
+
 -- name: AssignTaskToWorker :exec
 UPDATE tasks
 SET worker_id=@worker_id, last_touched_at=@now, updated_at=@now

internal/manager/persistence/sqlc/query_task_scheduler.sql.go

@@ -82,6 +82,70 @@ func (q *Queries) FetchAssignedAndRunnableTaskOfWorker(ctx context.Context, arg
 	return i, err
 }
 
+const fetchWorkerTask = `-- name: FetchWorkerTask :one
+SELECT
+  tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity,
+  jobs.id, jobs.created_at, jobs.updated_at, jobs.uuid, jobs.name, jobs.job_type, jobs.priority, jobs.status, jobs.activity, jobs.settings, jobs.metadata, jobs.delete_requested_at, jobs.storage_shaman_checkout_id, jobs.worker_tag_id,
+  (tasks.status = ?1 AND jobs.status = ?2) as is_active
+FROM tasks
+  INNER JOIN jobs ON tasks.job_id = jobs.id
+WHERE
+  tasks.worker_id = ?3
+ORDER BY
+  is_active DESC,
+  tasks.updated_at DESC
+LIMIT 1
+`
+
+type FetchWorkerTaskParams struct {
+	TaskStatusActive string
+	JobStatusActive  string
+	WorkerID         sql.NullInt64
+}
+
+type FetchWorkerTaskRow struct {
+	Task     Task
+	Job      Job
+	IsActive interface{}
+}
+
+// Find the currently-active task assigned to a Worker. If not found, find the last task this Worker worked on.
+func (q *Queries) FetchWorkerTask(ctx context.Context, arg FetchWorkerTaskParams) (FetchWorkerTaskRow, error) {
+	row := q.db.QueryRowContext(ctx, fetchWorkerTask, arg.TaskStatusActive, arg.JobStatusActive, arg.WorkerID)
+	var i FetchWorkerTaskRow
+	err := row.Scan(
+		&i.Task.ID,
+		&i.Task.CreatedAt,
+		&i.Task.UpdatedAt,
+		&i.Task.UUID,
+		&i.Task.Name,
+		&i.Task.Type,
+		&i.Task.JobID,
+		&i.Task.Priority,
+		&i.Task.Status,
+		&i.Task.WorkerID,
+		&i.Task.LastTouchedAt,
+		&i.Task.Commands,
+		&i.Task.Activity,
+		&i.Job.ID,
+		&i.Job.CreatedAt,
+		&i.Job.UpdatedAt,
+		&i.Job.UUID,
+		&i.Job.Name,
+		&i.Job.JobType,
+		&i.Job.Priority,
+		&i.Job.Status,
+		&i.Job.Activity,
+		&i.Job.Settings,
+		&i.Job.Metadata,
+		&i.Job.DeleteRequestedAt,
+		&i.Job.StorageShamanCheckoutID,
+		&i.Job.WorkerTagID,
+		&i.IsActive,
+	)
+	return i, err
+}
+
 const findRunnableTask = `-- name: FindRunnableTask :one
 SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity
 FROM tasks

internal/manager/persistence/task_scheduler.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
-	"gorm.io/gorm"
 
 	"projects.blender.org/studio/flamenco/internal/manager/persistence/sqlc"
 	"projects.blender.org/studio/flamenco/pkg/api"
@@ -164,14 +163,3 @@ func findTaskForWorker(
 	}
 	return row.Task, nil
 }
-
-// taskAssignedAndRunnableQuery appends some GORM clauses to query for a task
-// that's already assigned to this worker, and is in a runnable state.
-func taskAssignedAndRunnableQuery(tx *gorm.DB, w *Worker) *gorm.DB {
-	return tx.
-		Joins("left join jobs on tasks.job_id = jobs.id").
-		Where("tasks.status = ?", api.TaskStatusActive).
-		Where("jobs.status in ?", schedulableJobStatuses).
-		Where("tasks.worker_id = ?", w.ID). // assigned to this worker
-		Limit(1)
-}

internal/manager/persistence/workers.go

@@ -5,6 +5,7 @@ package persistence
 import (
 	"context"
 	"database/sql"
+	"errors"
 	"fmt"
 	"strings"
 	"time"
@@ -191,38 +192,49 @@ func (db *DB) FetchWorkers(ctx context.Context) ([]*Worker, error) {
 
 // FetchWorkerTask returns the most recent task assigned to the given Worker.
 func (db *DB) FetchWorkerTask(ctx context.Context, worker *Worker) (*Task, error) {
-	task := Task{}
-
-	// See if there is a task assigned to this worker in the same way that the
-	// task scheduler does.
-	query := db.gormDB.WithContext(ctx)
-	query = taskAssignedAndRunnableQuery(query, worker)
-	tx := query.
-		Order("tasks.updated_at").
-		Preload("Job").
-		Find(&task)
-	if tx.Error != nil {
-		return nil, taskError(tx.Error, "fetching task assigned to Worker %s", worker.UUID)
-	}
-	if task.ID != 0 {
-		// Found a task!
-		return &task, nil
+	queries, err := db.queries()
+	if err != nil {
+		return nil, err
 	}
 
-	// If not found, just find the last-modified task associated with this Worker.
-	tx = db.gormDB.WithContext(ctx).
-		Where("worker_id = ?", worker.ID).
-		Order("tasks.updated_at DESC").
-		Preload("Job").
-		Find(&task)
-	if tx.Error != nil {
-		return nil, taskError(tx.Error, "fetching task assigned to Worker %s", worker.UUID)
-	}
-	if task.ID == 0 {
+	// Convert the WorkerID to a NullInt64. As task.worker_id can be NULL, this is
+	// what sqlc expects us to pass in.
+	workerID := sql.NullInt64{Int64: int64(worker.ID), Valid: true}
+
+	row, err := queries.FetchWorkerTask(ctx, sqlc.FetchWorkerTaskParams{
+		TaskStatusActive: string(api.TaskStatusActive),
+		JobStatusActive:  string(api.JobStatusActive),
+		WorkerID:         workerID,
+	})
+
+	switch {
+	case errors.Is(err, sql.ErrNoRows):
 		return nil, nil
+	case err != nil:
+		return nil, taskError(err, "fetching task assigned to Worker %s", worker.UUID)
 	}
 
-	return &task, nil
+	// Found a task!
+	if row.Job.ID == 0 {
+		panic(fmt.Sprintf("task found but with no job: %#v", row))
+	}
+	if row.Task.ID == 0 {
+		panic(fmt.Sprintf("task found but with zero ID: %#v", row))
+	}
+
+	// Convert the task & job to gorm data types.
+	gormTask, err := convertSqlcTask(row.Task, row.Job.UUID, worker.UUID)
+	if err != nil {
+		return nil, err
+	}
+	gormJob, err := convertSqlcJob(row.Job)
+	if err != nil {
+		return nil, err
+	}
+	gormTask.Job = &gormJob
+	gormTask.Worker = worker
+
+	return gormTask, nil
 }
 
 func (db *DB) SaveWorkerStatus(ctx context.Context, w *Worker) error {