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https://github.com/vgarvardt/gue
Golang queue on top of PostgreSQL
https://github.com/vgarvardt/gue
go golang postgres postgresql queue
Last synced: 11 days ago
JSON representation
Golang queue on top of PostgreSQL
- Host: GitHub
- URL: https://github.com/vgarvardt/gue
- Owner: vgarvardt
- License: mit
- Created: 2020-06-12T18:17:47.000Z (about 4 years ago)
- Default Branch: master
- Last Pushed: 2024-06-04T09:06:27.000Z (19 days ago)
- Last Synced: 2024-06-05T07:11:51.868Z (18 days ago)
- Topics: go, golang, postgres, postgresql, queue
- Language: Go
- Homepage:
- Size: 729 KB
- Stars: 252
- Watchers: 3
- Forks: 23
- Open Issues: 10
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Funding: .github/FUNDING.yml
- License: LICENSE
Lists
- my-awesome-stars - vgarvardt/gue - Golang queue on top of PostgreSQL (Go)
- awesome-stars - vgarvardt/gue - Golang queue on top of PostgreSQL (Go)
README
# gue
[](https://pkg.go.dev/github.com/vgarvardt/gue/v5)
[](https://codecov.io/gh/vgarvardt/gue)
[](https://goreportcard.com/report/github.com/vgarvardt/gue)
[](http://opensource.org/licenses/MIT)
Gue is Golang queue on top of PostgreSQL that uses transaction-level locks.
Originally this project used to be a fork of [bgentry/que-go](https://github.com/bgentry/que-go)
but because of some backward-compatibility breaking changes and original library author not being very responsive for
PRs I turned fork into standalone project. Version 2 breaks internal backward-compatibility with the original project -
DB table and all the internal logic (queries, algorithms) is completely rewritten.
The name Gue is yet another silly word transformation: Queue -> Que, Go + Que -> Gue.
## Install
```shell
go get -u github.com/vgarvardt/gue/v5
```
Additionally, you need to apply [DB migration](migrations/schema.sql).
## Usage Example
```go
package main
import (
"context"
"encoding/json"
"fmt"
"log"
"os"
"time"
"github.com/jackc/pgx/v5/pgxpool"
"golang.org/x/sync/errgroup"
"github.com/vgarvardt/gue/v5"
"github.com/vgarvardt/gue/v5/adapter/pgxv5"
)
const (
printerQueue = "name_printer"
jobTypePrinter = "PrintName"
)
type printNameArgs struct {
Name string
}
func main() {
printName := func(ctx context.Context, j *gue.Job) error {
var args printNameArgs
if err := json.Unmarshal(j.Args, &args); err != nil {
return err
}
fmt.Printf("Hello %s!\n", args.Name)
return nil
}
pgxCfg, err := pgxpool.ParseConfig(os.Getenv("DATABASE_URL"))
if err != nil {
log.Fatal(err)
}
pgxPool, err := pgxpool.NewWithConfig(context.Background(), pgxCfg)
if err != nil {
log.Fatal(err)
}
defer pgxPool.Close()
poolAdapter := pgxv5.NewConnPool(pgxPool)
gc, err := gue.NewClient(poolAdapter)
if err != nil {
log.Fatal(err)
}
wm := gue.WorkMap{
jobTypePrinter: printName,
}
finishedJobsLog := func(ctx context.Context, j *gue.Job, err error) {
if err != nil {
return
}
j.Tx().Exec(
ctx,
"INSERT INTO finished_jobs_log (queue, type, run_at) VALUES ($1, $2, now())",
j.Queue,
j.Type,
)
}
// create a pool w/ 2 workers
workers, err := gue.NewWorkerPool(gc, wm, 2, gue.WithPoolQueue(printerQueue), gue.WithPoolHooksJobDone(finishedJobsLog))
if err != nil {
log.Fatal(err)
}
ctx, shutdown := context.WithCancel(context.Background())
// work jobs in goroutine
g, gctx := errgroup.WithContext(ctx)
g.Go(func() error {
err := workers.Run(gctx)
if err != nil {
// In a real-world applications, use a better way to shut down
// application on unrecoverable error. E.g. fx.Shutdowner from
// go.uber.org/fx module.
log.Fatal(err)
}
return err
})
args, err := json.Marshal(printNameArgs{Name: "vgarvardt"})
if err != nil {
log.Fatal(err)
}
j := &gue.Job{
Type: jobTypePrinter,
Queue: printerQueue,
Args: args,
}
if err := gc.Enqueue(context.Background(), j); err != nil {
log.Fatal(err)
}
j = &gue.Job{
Type: jobTypePrinter,
Queue: printerQueue,
RunAt: time.Now().UTC().Add(30 * time.Second), // delay 30 seconds
Args: args,
}
if err := gc.Enqueue(context.Background(), j); err != nil {
log.Fatal(err)
}
time.Sleep(30 * time.Second) // wait for while
// send shutdown signal to worker
shutdown()
if err := g.Wait(); err != nil {
log.Fatal(err)
}
}
```
## PostgreSQL drivers
Package supports several PostgreSQL drivers using adapter interface internally. Currently, adapters for the following
drivers have been implemented:
- [github.com/jackc/pgx/v5](https://github.com/jackc/pgx)
- [github.com/jackc/pgx/v4](https://github.com/jackc/pgx)
- [github.com/lib/pq](https://github.com/lib/pq)
### `pgx/v5`
```go
package main
import (
"log"
"os"
"github.com/jackc/pgx/v5/pgxpool"
"github.com/vgarvardt/gue/v5"
"github.com/vgarvardt/gue/v5/adapter/pgxv5"
)
func main() {
pgxCfg, err := pgxpool.ParseConfig(os.Getenv("DATABASE_URL"))
if err != nil {
log.Fatal(err)
}
pgxPool, err := pgxpool.NewConfig(context.Background(), pgxCfg)
if err != nil {
log.Fatal(err)
}
defer pgxPool.Close()
poolAdapter := pgxv5.NewConnPool(pgxPool)
gc, err := gue.NewClient(poolAdapter)
...
}
```
### `pgx/v4`
```go
package main
import (
"context"
"log"
"os"
"github.com/jackc/pgx/v4/pgxpool"
"github.com/vgarvardt/gue/v5"
"github.com/vgarvardt/gue/v5/adapter/pgxv4"
)
func main() {
pgxCfg, err := pgxpool.ParseConfig(os.Getenv("DATABASE_URL"))
if err != nil {
log.Fatal(err)
}
pgxPool, err := pgxpool.ConnectConfig(context.Background(), pgxCfg)
if err != nil {
log.Fatal(err)
}
defer pgxPool.Close()
poolAdapter := pgxv4.NewConnPool(pgxPool)
gc, err := gue.NewClient(poolAdapter)
...
}
```
### `lib/pq`
```go
package main
import (
"database/sql"
"log"
"os"
_ "github.com/lib/pq" // register postgres driver
"github.com/vgarvardt/gue/v5"
"github.com/vgarvardt/gue/v5/adapter/libpq"
)
func main() {
db, err := sql.Open("postgres", os.Getenv("DATABASE_URL"))
if err != nil {
log.Fatal(err)
}
defer db.Close()
poolAdapter := libpq.NewConnPool(db)
gc, err := gue.NewClient(poolAdapter)
...
}
```
## Logging
Package supports several logging libraries using adapter interface internally. Currently, adapters for the following
drivers have been implemented:
- NoOp (`adapter.NoOpLogger`) - default adapter that does nothing, so it is basically `/dev/null` logger
- Stdlib `log` - adapter that uses [`log`](https://golang.org/pkg/log/) logger for logs output. Instantiate it
with `adapter.NewStdLogger(...)`.
- Uber `zap` - adapter that uses [`go.uber.org/zap`](https://pkg.go.dev/go.uber.org/zap) logger for logs output.
Instantiate it with `adapter/zap.New(...)`.
- Olivier Poitrey's `zerolog` - adapter that uses [`github.com/rs/zerolog`](https://pkg.go.dev/github.com/rs/zerolog)
logger for logs output. Instantiate it with `adapter/zerolog.New(...)`.
- Stdlib `slog` - adapter that uses [`log/slog`](https://pkg.go.dev/log/slog)
logger for logs output. Instantiate it with `adapter/slog.New(...)`.