120 lines
2.4 KiB
Go
120 lines
2.4 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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"os"
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"emperror.dev/errors"
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"github.com/Masterminds/squirrel"
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"github.com/jackc/pgx/v4/pgxpool"
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"github.com/mediocregopher/radix/v4"
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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 DB struct {
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*pgxpool.Pool
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Redis radix.Client
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}
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func New(dsn string) (*DB, error) {
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pool, err := pgxpool.Connect(context.Background(), dsn)
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if err != nil {
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return nil, err
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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, err
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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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}
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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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