Phase 1 core domain storage

PLAN.md

@@ -14,16 +14,16 @@
 - [x] Add `Makefile` / `taskfile` for common commands
 - [x] Set up Go linters and CI (GitHub Actions)
 
-## Phase 1 – Core Domain & Storage
+## Phase 1 – Core Domain & Storage ✅
 
-- [ ] Define job model:
-  - [ ] `Job` (id, type, queue, payload, status, attempts, scheduled_at, etc.)
-  - [ ] `Queue` model and statuses
-- [ ] Implement backend interfaces:
-  - [ ] `Backend` interface (enqueue, reserve, ack, nack, moveToDLQ, listQueues, listJobs)
-  - [ ] Postgres implementation (including migrations)
-  - [ ] Redis implementation (fast queue operations, locks)
-- [ ] Unit tests for backend behavior
+- [x] Define job model:
+  - [x] `Job` (id, type, queue, payload, status, attempts, scheduled_at, etc.)
+  - [x] `Queue` model and statuses
+- [x] Implement backend interfaces:
+  - [x] `Backend` interface (enqueue, reserve, ack, nack, moveToDLQ, listQueues, listJobs)
+  - [x] Postgres implementation (including migrations)
+  - [x] Redis implementation (fast queue operations, locks)
+- [x] Unit tests for backend behavior
 
 ## Phase 2 – Worker Pool & Execution
 

go.mod

@@ -1,3 +1,28 @@
 module github.com/reckziegelwilliam/queuekit
 
-go 1.23
+go 1.24.0
+
+require (
+	github.com/golang-migrate/migrate/v4 v4.19.1
+	github.com/google/uuid v1.6.0
+	github.com/jackc/pgx/v5 v5.7.6
+	github.com/redis/go-redis/v9 v9.17.2
+	github.com/stretchr/testify v1.11.1
+)
+
+require (
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
+	github.com/jackc/puddle/v2 v2.2.2 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/lib/pq v1.10.9 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/rogpeppe/go-internal v1.14.1 // indirect
+	golang.org/x/crypto v0.45.0 // indirect
+	golang.org/x/sync v0.18.0 // indirect
+	golang.org/x/text v0.31.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -0,0 +1,104 @@
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internal/backend/backend.go

@@ -0,0 +1,44 @@
+package backend
+
+import (
+	"context"
+
+	"github.com/reckziegelwilliam/queuekit/internal/queue"
+)
+
+// Backend defines the interface for job queue storage backends
+type Backend interface {
+	// Enqueue adds a new job to the queue
+	Enqueue(ctx context.Context, job *queue.Job) error
+
+	// Reserve atomically claims the next available job from the specified queue
+	// Returns nil if no jobs are available
+	Reserve(ctx context.Context, queueName string) (*queue.Job, error)
+
+	// Ack marks a job as successfully completed
+	Ack(ctx context.Context, jobID string) error
+
+	// Nack marks a job as failed and increments its attempt count
+	// If the job has exceeded max attempts, it should be moved to DLQ automatically
+	Nack(ctx context.Context, jobID string, err error) error
+
+	// MoveToDLQ moves a job to the dead-letter queue
+	MoveToDLQ(ctx context.Context, jobID string) error
+
+	// ListQueues returns all queues with their statistics
+	ListQueues(ctx context.Context) ([]queue.Queue, error)
+
+	// ListJobs returns jobs from a queue with optional filtering
+	// If queueName is empty, returns jobs from all queues
+	// If status is empty, returns jobs with any status
+	ListJobs(ctx context.Context, queueName, status string, limit, offset int) ([]*queue.Job, error)
+
+	// GetJob retrieves a single job by its ID
+	GetJob(ctx context.Context, jobID string) (*queue.Job, error)
+
+	// DeleteJob permanently deletes a job
+	DeleteJob(ctx context.Context, jobID string) error
+
+	// Close cleans up backend resources
+	Close() error
+}

internal/backend/postgres/migrations.go

@@ -0,0 +1,49 @@
+package postgres
+
+import (
+	"context"
+	"embed"
+	"fmt"
+
+	"github.com/golang-migrate/migrate/v4"
+	_ "github.com/golang-migrate/migrate/v4/database/postgres"
+	"github.com/golang-migrate/migrate/v4/source/iofs"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+//go:embed migrations/*.sql
+var migrationsFS embed.FS
+
+// RunMigrations applies all pending migrations to the database
+func RunMigrations(ctx context.Context, pool *pgxpool.Pool) error {
+	// Get database connection string from pool config
+	config := pool.Config()
+	connString := fmt.Sprintf("postgres://%s:%s@%s:%d/%s?sslmode=%s",
+		config.ConnConfig.User,
+		config.ConnConfig.Password,
+		config.ConnConfig.Host,
+		config.ConnConfig.Port,
+		config.ConnConfig.Database,
+		"disable", // Adjust as needed
+	)
+
+	// Create migration source from embedded filesystem
+	source, err := iofs.New(migrationsFS, "migrations")
+	if err != nil {
+		return fmt.Errorf("failed to create migration source: %w", err)
+	}
+
+	// Create migrator
+	m, err := migrate.NewWithSourceInstance("iofs", source, connString)
+	if err != nil {
+		return fmt.Errorf("failed to create migrator: %w", err)
+	}
+	defer m.Close()
+
+	// Run migrations
+	if err := m.Up(); err != nil && err != migrate.ErrNoChange {
+		return fmt.Errorf("failed to run migrations: %w", err)
+	}
+
+	return nil
+}

internal/backend/postgres/migrations/000001_create_jobs_table.down.sql

@@ -0,0 +1,8 @@
+-- Drop jobs table and all associated indexes
+DROP INDEX IF EXISTS idx_jobs_type;
+DROP INDEX IF EXISTS idx_jobs_created_at;
+DROP INDEX IF EXISTS idx_jobs_queue;
+DROP INDEX IF EXISTS idx_jobs_status;
+DROP INDEX IF EXISTS idx_jobs_queue_status_scheduled;
+DROP TABLE IF EXISTS jobs;
+

internal/backend/postgres/migrations/000001_create_jobs_table.up.sql

@@ -0,0 +1,45 @@
+-- Create jobs table
+CREATE TABLE IF NOT EXISTS jobs (
+    id VARCHAR(36) PRIMARY KEY,
+    type VARCHAR(255) NOT NULL,
+    queue VARCHAR(255) NOT NULL,
+    payload JSONB NOT NULL,
+    status VARCHAR(50) NOT NULL DEFAULT 'pending',
+    priority INTEGER NOT NULL DEFAULT 10,
+    attempts INTEGER NOT NULL DEFAULT 0,
+    max_attempts INTEGER NOT NULL DEFAULT 3,
+    scheduled_at TIMESTAMP WITH TIME ZONE NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL,
+    updated_at TIMESTAMP WITH TIME ZONE NOT NULL,
+    completed_at TIMESTAMP WITH TIME ZONE,
+    failed_at TIMESTAMP WITH TIME ZONE,
+    last_error TEXT
+);
+
+-- Create indexes for efficient job retrieval
+CREATE INDEX IF NOT EXISTS idx_jobs_queue_status_scheduled 
+    ON jobs(queue, status, scheduled_at) 
+    WHERE status IN ('pending', 'running');
+
+CREATE INDEX IF NOT EXISTS idx_jobs_status 
+    ON jobs(status);
+
+CREATE INDEX IF NOT EXISTS idx_jobs_queue 
+    ON jobs(queue);
+
+CREATE INDEX IF NOT EXISTS idx_jobs_created_at 
+    ON jobs(created_at DESC);
+
+CREATE INDEX IF NOT EXISTS idx_jobs_type 
+    ON jobs(type);
+
+-- Add check constraints
+ALTER TABLE jobs ADD CONSTRAINT chk_status 
+    CHECK (status IN ('pending', 'running', 'completed', 'failed', 'dead'));
+
+ALTER TABLE jobs ADD CONSTRAINT chk_max_attempts 
+    CHECK (max_attempts >= 1);
+
+ALTER TABLE jobs ADD CONSTRAINT chk_attempts 
+    CHECK (attempts >= 0);
+