159 lines
3.6 KiB
Go
159 lines
3.6 KiB
Go
package db
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import (
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"context"
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"encoding/json"
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"fmt"
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"net/url"
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"os"
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"emperror.dev/errors"
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"github.com/Masterminds/squirrel"
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"github.com/jackc/pgx/v5/pgconn"
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"github.com/jackc/pgx/v5/pgxpool"
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"github.com/mediocregopher/radix/v4"
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"github.com/minio/minio-go/v7"
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"github.com/minio/minio-go/v7/pkg/credentials"
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)
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var sq = squirrel.StatementBuilder.PlaceholderFormat(squirrel.Dollar)
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const ErrNothingToUpdate = errors.Sentinel("nothing to update")
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type Execer interface {
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Exec(ctx context.Context, sql string, arguments ...interface{}) (commandTag pgconn.CommandTag, err error)
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}
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type DB struct {
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*pgxpool.Pool
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Redis radix.Client
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minio *minio.Client
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minioBucket string
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baseURL *url.URL
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}
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func New() (*DB, error) {
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pool, err := pgxpool.New(context.Background(), os.Getenv("DATABASE_URL"))
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if err != nil {
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return nil, errors.Wrap(err, "creating postgres client")
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}
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redis, err := (&radix.PoolConfig{}).New(context.Background(), "tcp", os.Getenv("REDIS"))
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if err != nil {
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return nil, errors.Wrap(err, "creating redis client")
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}
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minioClient, err := minio.New(os.Getenv("MINIO_ENDPOINT"), &minio.Options{
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Creds: credentials.NewStaticV4(os.Getenv("MINIO_ACCESS_KEY_ID"), os.Getenv("MINIO_ACCESS_KEY_SECRET"), ""),
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Secure: os.Getenv("MINIO_SSL") == "true",
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})
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if err != nil {
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return nil, errors.Wrap(err, "creating minio client")
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}
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baseURL, err := url.Parse(os.Getenv("BASE_URL"))
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if err != nil {
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return nil, errors.Wrap(err, "parsing base URL")
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}
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db := &DB{
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Pool: pool,
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Redis: redis,
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minio: minioClient,
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minioBucket: os.Getenv("MINIO_BUCKET"),
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baseURL: baseURL,
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}
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return db, nil
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}
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// MultiCmd executes the given Redis commands in order.
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// If any return an error, the function is aborted.
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func (db *DB) MultiCmd(ctx context.Context, cmds ...radix.Action) error {
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for _, cmd := range cmds {
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err := db.Redis.Do(ctx, cmd)
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if err != nil {
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return err
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}
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}
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return nil
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}
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// SetJSON sets the given key to v marshaled as JSON.
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func (db *DB) SetJSON(ctx context.Context, key string, v any, args ...string) error {
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b, err := json.Marshal(v)
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if err != nil {
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return errors.Wrap(err, "marshaling json")
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}
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cmdArgs := make([]string, 0, len(args)+2)
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cmdArgs = append(cmdArgs, key, string(b))
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cmdArgs = append(cmdArgs, args...)
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err = db.Redis.Do(ctx, radix.Cmd(nil, "SET", cmdArgs...))
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if err != nil {
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return errors.Wrap(err, "writing to Redis")
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}
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return nil
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}
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// GetJSON gets the given key as a JSON object.
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func (db *DB) GetJSON(ctx context.Context, key string, v any) error {
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var b []byte
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err := db.Redis.Do(ctx, radix.Cmd(&b, "GET", key))
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if err != nil {
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return errors.Wrap(err, "reading from Redis")
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}
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if b == nil {
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return nil
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}
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if v == nil {
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return fmt.Errorf("nil pointer passed into GetJSON")
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}
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err = json.Unmarshal(b, v)
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if err != nil {
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return errors.Wrap(err, "unmarshaling json")
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}
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return nil
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}
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// GetDelJSON gets the given key as a JSON object and deletes it.
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func (db *DB) GetDelJSON(ctx context.Context, key string, v any) error {
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var b []byte
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err := db.Redis.Do(ctx, radix.Cmd(&b, "GETDEL", key))
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if err != nil {
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return errors.Wrap(err, "reading from Redis")
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}
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if b == nil {
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return nil
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}
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if v == nil {
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return fmt.Errorf("nil pointer passed into GetDelJSON")
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}
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err = json.Unmarshal(b, v)
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if err != nil {
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return errors.Wrap(err, "unmarshaling json")
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}
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return nil
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}
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// NotNull is a little helper that returns an *empty slice* when the slice's length is 0.
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// This is to prevent nil slices from being marshaled as JSON null
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func NotNull[T any](slice []T) []T {
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if len(slice) == 0 {
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return []T{}
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}
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return slice
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}
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