From e3b7ea5011ac1c769de15d3989ffa7fefc8cfa3b Mon Sep 17 00:00:00 2001 From: tiennm99 Date: Mon, 11 May 2026 20:15:35 +0700 Subject: [PATCH] =?UTF-8?q?feat:=20initial=20db-keepalive=20=E2=80=94=20pl?= =?UTF-8?q?uggable=20adapters=20for=206=20free-tier=20DBs?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Consolidates the *-keepalive family (redis, valkey, postgresql, mysql, mongodb, couchbase) into a single binary with a runtime DB_TYPE dispatch and an Adapter interface. Original repos archived with a pointer here. --- .env.example | 28 ++++++ .gitignore | 7 ++ Dockerfile | 11 +++ LICENSE | 201 +++++++++++++++++++++++++++++++++++++ README.md | 80 +++++++++++++++ adapter/adapter.go | 46 +++++++++ adapter/couchbase.go | 88 +++++++++++++++++ adapter/env.go | 14 +++ adapter/mongodb.go | 60 +++++++++++ adapter/mysql.go | 58 +++++++++++ adapter/postgresql.go | 49 +++++++++ adapter/redis.go | 38 +++++++ adapter/valkey.go | 43 ++++++++ go.mod | 47 +++++++++ go.sum | 225 ++++++++++++++++++++++++++++++++++++++++++ main.go | 85 ++++++++++++++++ 16 files changed, 1080 insertions(+) create mode 100644 .env.example create mode 100644 .gitignore create mode 100644 Dockerfile create mode 100644 LICENSE create mode 100644 README.md create mode 100644 adapter/adapter.go create mode 100644 adapter/couchbase.go create mode 100644 adapter/env.go create mode 100644 adapter/mongodb.go create mode 100644 adapter/mysql.go create mode 100644 adapter/postgresql.go create mode 100644 adapter/redis.go create mode 100644 adapter/valkey.go create mode 100644 go.mod create mode 100644 go.sum create mode 100644 main.go diff --git a/.env.example b/.env.example new file mode 100644 index 0000000..4e32556 --- /dev/null +++ b/.env.example @@ -0,0 +1,28 @@ +# Pick one of: redis, valkey, postgresql, mysql, mongodb, couchbase +DB_TYPE=redis + +# Optional: tick interval (e.g. 30s, 1m, 5m). Defaults to 1m. +# INTERVAL=1m + +# --- redis / valkey --- +REDIS_URL=redis://default@127.0.0.1:6379 +# VALKEY_URL=valkey://default@127.0.0.1:6379 + +# --- postgresql --- +# SERVICE_URI=postgres://user:pass@host:5432/dbname?sslmode=require + +# --- mysql --- +# DATA_SOURCE_NAME=user:pass@tcp(host:3306)/dbname + +# --- mongodb --- +# MONGODB_URI=mongodb+srv://user:pass@cluster.mongodb.net +# MONGODB_DATABASE=keepalive +# MONGODB_COLLECTION=counter + +# --- couchbase --- +# COUCHBASE_CONNECTION_STRING=couchbases://cb.host +# COUCHBASE_USERNAME= +# COUCHBASE_PASSWORD= +# COUCHBASE_BUCKET_NAME= +# COUCHBASE_SCOPE_NAME=_default +# COUCHBASE_COLLECTION_NAME=_default diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..3e0be96 --- /dev/null +++ b/.gitignore @@ -0,0 +1,7 @@ +.env +*.pem +ca.pem +/db-keepalive +/dist/ +*.test +*.out diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..8bc1c71 --- /dev/null +++ b/Dockerfile @@ -0,0 +1,11 @@ +FROM golang:1.23-alpine AS build +WORKDIR /src +COPY go.mod go.sum ./ +RUN go mod download +COPY . . +RUN CGO_ENABLED=0 go build -ldflags="-s -w" -o /out/db-keepalive . + +FROM gcr.io/distroless/static-debian12:nonroot +COPY --from=build /out/db-keepalive /db-keepalive +USER nonroot:nonroot +ENTRYPOINT ["/db-keepalive"] diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..261eeb9 --- /dev/null +++ b/LICENSE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/README.md b/README.md new file mode 100644 index 0000000..62cbece --- /dev/null +++ b/README.md @@ -0,0 +1,80 @@ +# db-keepalive + +Pluggable Go daemon that performs a periodic counter increment to prevent free-tier database clusters (Redis Cloud, Valkey, Aiven, Neon, Supabase, MongoDB Atlas, Couchbase Capella, etc.) from being auto-paused for inactivity. + +Successor to the `*-keepalive` family: one binary, one image, six adapters. + +## Supported drivers + +| `DB_TYPE` | Driver | Env vars | +| ------------ | ----------------------------------- | -------- | +| `redis` | `github.com/redis/go-redis/v9` | `REDIS_URL` | +| `valkey` | `github.com/valkey-io/valkey-go` | `VALKEY_URL` | +| `postgresql` | `github.com/lib/pq` | `SERVICE_URI` | +| `mysql` | `github.com/go-sql-driver/mysql` | `DATA_SOURCE_NAME` | +| `mongodb` | `go.mongodb.org/mongo-driver/v2` | `MONGODB_URI`, `MONGODB_DATABASE`, `MONGODB_COLLECTION` | +| `couchbase` | `github.com/couchbase/gocb/v2` | `COUCHBASE_CONNECTION_STRING`, `COUCHBASE_USERNAME`, `COUCHBASE_PASSWORD`, `COUCHBASE_BUCKET_NAME`, `COUCHBASE_SCOPE_NAME`, `COUCHBASE_COLLECTION_NAME` | + +Optional: `INTERVAL` (e.g. `30s`, `5m`; default `1m`), `COUNTER_KEY` (default `counter`). + +## Quick start (Docker) + +```bash +docker run -d --name db-keepalive --restart unless-stopped \ + -e DB_TYPE=redis \ + -e REDIS_URL='redis://default@host:6379' \ + ghcr.io/tiennm99/db-keepalive:latest +``` + +## Quick start (local) + +```bash +git clone https://github.com/tiennm99/db-keepalive +cd db-keepalive +cp .env.example .env # then edit DB_TYPE + the driver's env vars +go run . +``` + +## How it works + +On every tick the chosen adapter performs the cheapest write that proves the cluster is alive: + +- **Redis/Valkey** — `INCR counter` +- **PostgreSQL** — `UPDATE keepalive SET value = value + 1 WHERE key = 'counter' RETURNING value` +- **MySQL** — `UPDATE` + `SELECT` inside a transaction +- **MongoDB** — `FindOneAndUpdate({_id: "counter"}, {$inc: {count: 1}}, upsert)` +- **Couchbase** — `GET counter` → `++` → `UPSERT counter` + +The PostgreSQL and MySQL adapters expect a table: + +```sql +CREATE TABLE keepalive (key TEXT PRIMARY KEY, value BIGINT NOT NULL DEFAULT 0); +INSERT INTO keepalive (key, value) VALUES ('counter', 0); +``` + +(MySQL uses backticked identifiers — see `adapter/mysql.go`.) + +## Adding a new database + +1. Create `adapter/.go`. +2. Implement the `Adapter` interface in `adapter/adapter.go` (`Connect`, `Increment`, `Close`). +3. Register the factory in `init()`: + ```go + func init() { Registry[""] = func() (Adapter, error) { return &myAdapter{}, nil } } + ``` +4. Add an `import _ "your driver"` if needed, and the env vars to `.env.example` and the table above. + +## Migrated from + +This repo replaces six single-database repos. All are archived with a pointer here: + +- [redis-keepalive](https://github.com/tiennm99/redis-keepalive) +- [valkey-keepalive](https://github.com/tiennm99/valkey-keepalive) +- [postgresql-keepalive](https://github.com/tiennm99/postgresql-keepalive) +- [mysql-keepalive](https://github.com/tiennm99/mysql-keepalive) +- [mongodb-keepalive](https://github.com/tiennm99/mongodb-keepalive) +- [couchbase-keepalive](https://github.com/tiennm99/couchbase-keepalive) + +## License + +Apache-2.0 — see [LICENSE](LICENSE). diff --git a/adapter/adapter.go b/adapter/adapter.go new file mode 100644 index 0000000..e11d21a --- /dev/null +++ b/adapter/adapter.go @@ -0,0 +1,46 @@ +// Package adapter defines the contract every database driver implements. +// +// An Adapter connects to a single backing store, increments a counter on every +// keepalive tick (the cheapest write that proves the cluster is live), and +// releases its resources on Close. New databases plug in by adding a file in +// this package and registering a factory in Registry. +package adapter + +import ( + "context" + "fmt" +) + +type Adapter interface { + Connect(ctx context.Context) error + Increment(ctx context.Context) (int64, error) + Close(ctx context.Context) error +} + +type Factory func() (Adapter, error) + +var Registry = map[string]Factory{} + +func New(dbType string) (Adapter, error) { + f, ok := Registry[dbType] + if !ok { + return nil, fmt.Errorf("unknown DB_TYPE %q (known: %v)", dbType, Known()) + } + return f() +} + +func Known() []string { + out := make([]string, 0, len(Registry)) + for k := range Registry { + out = append(out, k) + } + return out +} + +func envOrFail(name string) (string, error) { + v, ok := lookupEnv(name) + if !ok || v == "" { + return "", fmt.Errorf("env %s is required", name) + } + return v, nil +} diff --git a/adapter/couchbase.go b/adapter/couchbase.go new file mode 100644 index 0000000..f766d9e --- /dev/null +++ b/adapter/couchbase.go @@ -0,0 +1,88 @@ +package adapter + +import ( + "context" + "time" + + "github.com/couchbase/gocb/v2" +) + +func init() { + Registry["couchbase"] = func() (Adapter, error) { return &couchbaseAdapter{}, nil } +} + +type couchbaseAdapter struct { + cluster *gocb.Cluster + coll *gocb.Collection + docID string +} + +func (a *couchbaseAdapter) Connect(_ context.Context) error { + conn, err := envOrFail("COUCHBASE_CONNECTION_STRING") + if err != nil { + return err + } + user, err := envOrFail("COUCHBASE_USERNAME") + if err != nil { + return err + } + pass, err := envOrFail("COUCHBASE_PASSWORD") + if err != nil { + return err + } + bucket, err := envOrFail("COUCHBASE_BUCKET_NAME") + if err != nil { + return err + } + scope, err := envOrFail("COUCHBASE_SCOPE_NAME") + if err != nil { + return err + } + collName, err := envOrFail("COUCHBASE_COLLECTION_NAME") + if err != nil { + return err + } + + opts := gocb.ClusterOptions{ + Authenticator: gocb.PasswordAuthenticator{Username: user, Password: pass}, + } + if err := opts.ApplyProfile(gocb.ClusterConfigProfileWanDevelopment); err != nil { + return err + } + cluster, err := gocb.Connect(conn, opts) + if err != nil { + return err + } + b := cluster.Bucket(bucket) + if err := b.WaitUntilReady(5*time.Second, nil); err != nil { + return err + } + a.cluster = cluster + a.coll = b.Scope(scope).Collection(collName) + a.docID = envOr("COUNTER_KEY", "counter") + return nil +} + +func (a *couchbaseAdapter) Increment(_ context.Context) (int64, error) { + docOut, err := a.coll.Get(a.docID, &gocb.GetOptions{}) + if err != nil { + // On first run the doc may not exist; seed at 1. + if _, upErr := a.coll.Upsert(a.docID, uint64(1), &gocb.UpsertOptions{}); upErr != nil { + return 0, upErr + } + return 1, nil + } + var current uint64 + if err := docOut.Content(¤t); err != nil { + return 0, err + } + current++ + if _, err := a.coll.Upsert(a.docID, current, &gocb.UpsertOptions{}); err != nil { + return 0, err + } + return int64(current), nil +} + +func (a *couchbaseAdapter) Close(_ context.Context) error { + return a.cluster.Close(nil) +} diff --git a/adapter/env.go b/adapter/env.go new file mode 100644 index 0000000..1311cf9 --- /dev/null +++ b/adapter/env.go @@ -0,0 +1,14 @@ +package adapter + +import "os" + +func lookupEnv(name string) (string, bool) { + return os.LookupEnv(name) +} + +func envOr(name, def string) string { + if v, ok := os.LookupEnv(name); ok && v != "" { + return v + } + return def +} diff --git a/adapter/mongodb.go b/adapter/mongodb.go new file mode 100644 index 0000000..f2d99b6 --- /dev/null +++ b/adapter/mongodb.go @@ -0,0 +1,60 @@ +package adapter + +import ( + "context" + + "go.mongodb.org/mongo-driver/v2/bson" + "go.mongodb.org/mongo-driver/v2/mongo" + "go.mongodb.org/mongo-driver/v2/mongo/options" +) + +func init() { + Registry["mongodb"] = func() (Adapter, error) { return &mongoAdapter{}, nil } + Registry["mongo"] = Registry["mongodb"] +} + +type mongoAdapter struct { + client *mongo.Client + coll *mongo.Collection + docID string +} + +func (a *mongoAdapter) Connect(ctx context.Context) error { + uri, err := envOrFail("MONGODB_URI") + if err != nil { + return err + } + dbName, err := envOrFail("MONGODB_DATABASE") + if err != nil { + return err + } + collName, err := envOrFail("MONGODB_COLLECTION") + if err != nil { + return err + } + client, err := mongo.Connect(options.Client().ApplyURI(uri)) + if err != nil { + return err + } + a.client = client + a.coll = client.Database(dbName).Collection(collName) + a.docID = envOr("COUNTER_KEY", "counter") + return client.Ping(ctx, nil) +} + +func (a *mongoAdapter) Increment(ctx context.Context) (int64, error) { + update := bson.M{"$inc": bson.M{"count": 1}} + opts := options.FindOneAndUpdate().SetUpsert(true).SetReturnDocument(options.After) + var out struct { + Count int64 `bson:"count"` + } + err := a.coll.FindOneAndUpdate(ctx, bson.M{"_id": a.docID}, update, opts).Decode(&out) + if err != nil { + return 0, err + } + return out.Count, nil +} + +func (a *mongoAdapter) Close(ctx context.Context) error { + return a.client.Disconnect(ctx) +} diff --git a/adapter/mysql.go b/adapter/mysql.go new file mode 100644 index 0000000..cc268fb --- /dev/null +++ b/adapter/mysql.go @@ -0,0 +1,58 @@ +package adapter + +import ( + "context" + "database/sql" + "time" + + _ "github.com/go-sql-driver/mysql" +) + +func init() { + Registry["mysql"] = func() (Adapter, error) { return &mysqlAdapter{}, nil } +} + +type mysqlAdapter struct { + db *sql.DB +} + +func (a *mysqlAdapter) Connect(ctx context.Context) error { + dsn, err := envOrFail("DATA_SOURCE_NAME") + if err != nil { + return err + } + db, err := sql.Open("mysql", dsn) + if err != nil { + return err + } + db.SetConnMaxLifetime(3 * time.Minute) + db.SetMaxOpenConns(10) + db.SetMaxIdleConns(10) + a.db = db + return a.db.PingContext(ctx) +} + +func (a *mysqlAdapter) Increment(ctx context.Context) (int64, error) { + tx, err := a.db.BeginTx(ctx, &sql.TxOptions{Isolation: sql.LevelReadCommitted}) + if err != nil { + return 0, err + } + if _, err := tx.ExecContext(ctx, + "UPDATE `keepalive` SET `value` = `value` + 1 WHERE `key` = 'counter'", + ); err != nil { + tx.Rollback() + return 0, err + } + var value int64 + if err := tx.QueryRowContext(ctx, + "SELECT `value` FROM `keepalive` WHERE `key` = 'counter'", + ).Scan(&value); err != nil { + tx.Rollback() + return 0, err + } + return value, tx.Commit() +} + +func (a *mysqlAdapter) Close(_ context.Context) error { + return a.db.Close() +} diff --git a/adapter/postgresql.go b/adapter/postgresql.go new file mode 100644 index 0000000..2233efc --- /dev/null +++ b/adapter/postgresql.go @@ -0,0 +1,49 @@ +package adapter + +import ( + "context" + "database/sql" + + _ "github.com/lib/pq" +) + +func init() { + Registry["postgresql"] = func() (Adapter, error) { return &postgresAdapter{}, nil } + Registry["postgres"] = Registry["postgresql"] +} + +type postgresAdapter struct { + db *sql.DB +} + +func (a *postgresAdapter) Connect(ctx context.Context) error { + uri, err := envOrFail("SERVICE_URI") + if err != nil { + return err + } + db, err := sql.Open("postgres", uri) + if err != nil { + return err + } + a.db = db + return a.db.PingContext(ctx) +} + +func (a *postgresAdapter) Increment(ctx context.Context) (int64, error) { + tx, err := a.db.BeginTx(ctx, &sql.TxOptions{Isolation: sql.LevelReadCommitted}) + if err != nil { + return 0, err + } + var value int64 + if err := tx.QueryRowContext(ctx, + `UPDATE keepalive SET value = value + 1 WHERE key = 'counter' RETURNING value`, + ).Scan(&value); err != nil { + tx.Rollback() + return 0, err + } + return value, tx.Commit() +} + +func (a *postgresAdapter) Close(_ context.Context) error { + return a.db.Close() +} diff --git a/adapter/redis.go b/adapter/redis.go new file mode 100644 index 0000000..d4cb5d6 --- /dev/null +++ b/adapter/redis.go @@ -0,0 +1,38 @@ +package adapter + +import ( + "context" + + "github.com/redis/go-redis/v9" +) + +func init() { + Registry["redis"] = func() (Adapter, error) { return &redisAdapter{}, nil } +} + +type redisAdapter struct { + client *redis.Client + key string +} + +func (a *redisAdapter) Connect(ctx context.Context) error { + url, err := envOrFail("REDIS_URL") + if err != nil { + return err + } + opt, err := redis.ParseURL(url) + if err != nil { + return err + } + a.client = redis.NewClient(opt) + a.key = envOr("COUNTER_KEY", "counter") + return a.client.Ping(ctx).Err() +} + +func (a *redisAdapter) Increment(ctx context.Context) (int64, error) { + return a.client.Incr(ctx, a.key).Result() +} + +func (a *redisAdapter) Close(_ context.Context) error { + return a.client.Close() +} diff --git a/adapter/valkey.go b/adapter/valkey.go new file mode 100644 index 0000000..8e5e0b6 --- /dev/null +++ b/adapter/valkey.go @@ -0,0 +1,43 @@ +package adapter + +import ( + "context" + + "github.com/valkey-io/valkey-go" +) + +func init() { + Registry["valkey"] = func() (Adapter, error) { return &valkeyAdapter{}, nil } +} + +type valkeyAdapter struct { + client valkey.Client + key string +} + +func (a *valkeyAdapter) Connect(_ context.Context) error { + url, err := envOrFail("VALKEY_URL") + if err != nil { + return err + } + opt, err := valkey.ParseURL(url) + if err != nil { + return err + } + client, err := valkey.NewClient(opt) + if err != nil { + return err + } + a.client = client + a.key = envOr("COUNTER_KEY", "counter") + return nil +} + +func (a *valkeyAdapter) Increment(ctx context.Context) (int64, error) { + return a.client.Do(ctx, a.client.B().Incr().Key(a.key).Build()).AsInt64() +} + +func (a *valkeyAdapter) Close(_ context.Context) error { + a.client.Close() + return nil +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..5fd44bd --- /dev/null +++ b/go.mod @@ -0,0 +1,47 @@ +module github.com/tiennm99/db-keepalive + +go 1.23.0 + +require ( + github.com/couchbase/gocb/v2 v2.9.4 + github.com/go-sql-driver/mysql v1.8.1 + github.com/joho/godotenv v1.5.1 + github.com/lib/pq v1.10.9 + github.com/redis/go-redis/v9 v9.17.1 + github.com/valkey-io/valkey-go v1.0.65 + go.mongodb.org/mongo-driver/v2 v2.0.0 +) + +require ( + filippo.io/edwards25519 v1.1.0 // indirect + github.com/cespare/xxhash/v2 v2.3.0 // indirect + github.com/couchbase/gocbcore/v10 v10.5.4 // indirect + github.com/couchbase/gocbcoreps v0.1.3 // indirect + github.com/couchbase/goprotostellar v1.0.2 // indirect + github.com/couchbaselabs/gocbconnstr/v2 v2.0.0-20240607131231-fb385523de28 // indirect + github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect + github.com/go-logr/logr v1.4.1 // indirect + github.com/go-logr/stdr v1.2.2 // indirect + github.com/golang/snappy v0.0.4 // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/grpc-ecosystem/go-grpc-middleware v1.4.0 // indirect + github.com/klauspost/compress v1.16.7 // indirect + github.com/xdg-go/pbkdf2 v1.0.0 // indirect + github.com/xdg-go/scram v1.1.2 // indirect + github.com/xdg-go/stringprep v1.0.4 // indirect + github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78 // indirect + go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.49.0 // indirect + go.opentelemetry.io/otel v1.24.0 // indirect + go.opentelemetry.io/otel/metric v1.24.0 // indirect + go.opentelemetry.io/otel/trace v1.24.0 // indirect + go.uber.org/multierr v1.11.0 // indirect + go.uber.org/zap v1.27.0 // indirect + golang.org/x/crypto v0.36.0 // indirect + golang.org/x/net v0.38.0 // indirect + golang.org/x/sync v0.12.0 // indirect + golang.org/x/sys v0.31.0 // indirect + golang.org/x/text v0.23.0 // indirect + google.golang.org/genproto/googleapis/rpc v0.0.0-20240401170217-c3f982113cda // indirect + google.golang.org/grpc v1.63.2 // indirect + google.golang.org/protobuf v1.33.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..89a16df --- /dev/null +++ b/go.sum @@ -0,0 +1,225 @@ 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v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= diff --git a/main.go b/main.go new file mode 100644 index 0000000..a0261b2 --- /dev/null +++ b/main.go @@ -0,0 +1,85 @@ +package main + +import ( + "context" + "log" + "os" + "os/signal" + "strconv" + "syscall" + "time" + + "github.com/joho/godotenv" + "github.com/tiennm99/db-keepalive/adapter" +) + +func main() { + if err := godotenv.Load(); err != nil { + log.Println("note: .env not loaded, relying on process env") + } + + dbType := os.Getenv("DB_TYPE") + if dbType == "" { + log.Fatalf("DB_TYPE is required (known: %v)", adapter.Known()) + } + + interval := parseInterval(os.Getenv("INTERVAL"), time.Minute) + + a, err := adapter.New(dbType) + if err != nil { + log.Fatalf("init adapter: %v", err) + } + + ctx, cancel := context.WithCancel(context.Background()) + defer cancel() + + if err := a.Connect(ctx); err != nil { + log.Fatalf("connect: %v", err) + } + defer func() { + shutdownCtx, c := context.WithTimeout(context.Background(), 5*time.Second) + defer c() + if err := a.Close(shutdownCtx); err != nil { + log.Printf("close: %v", err) + } + }() + + log.Printf("db-keepalive: %s every %s", dbType, interval) + + go func() { + ticker := time.NewTicker(interval) + defer ticker.Stop() + for { + select { + case <-ctx.Done(): + return + case <-ticker.C: + tickCtx, tcancel := context.WithTimeout(ctx, 3*time.Second) + count, err := a.Increment(tickCtx) + tcancel() + if err != nil { + log.Printf("increment: %v", err) + continue + } + log.Printf("counter: %d", count) + } + } + }() + + sigCh := make(chan os.Signal, 1) + signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM) + <-sigCh +} + +func parseInterval(s string, def time.Duration) time.Duration { + if s == "" { + return def + } + if d, err := time.ParseDuration(s); err == nil { + return d + } + if n, err := strconv.Atoi(s); err == nil { + return time.Duration(n) * time.Second + } + return def +}