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updater.go
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updater.go
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package dalgo2buntdb
import (
"context"
"encoding/json"
"errors"
"fmt"
"github.com/dal-go/dalgo/dal"
"github.com/tidwall/buntdb"
)
func (dtb database) Update(
ctx context.Context,
key *dal.Key,
updates []dal.Update,
preconditions ...dal.Precondition,
) error {
return dtb.db.Update(func(tx *buntdb.Tx) error {
return transaction{tx: tx}.Update(ctx, key, updates, preconditions...)
})
}
func (dtb database) UpdateMulti(
ctx context.Context,
keys []*dal.Key,
updates []dal.Update,
preconditions ...dal.Precondition,
) error {
return dtb.db.Update(func(tx *buntdb.Tx) error {
return transaction{tx: tx}.UpdateMulti(ctx, keys, updates, preconditions...)
})
}
func (t transaction) Update(
ctx context.Context,
key *dal.Key,
updates []dal.Update,
preconditions ...dal.Precondition,
) error {
return t.update(ctx, key, updates, preconditions...)
}
func (t transaction) UpdateMulti(
ctx context.Context,
keys []*dal.Key,
updates []dal.Update,
preconditions ...dal.Precondition,
) error {
for _, key := range keys {
if err := t.update(ctx, key, updates, preconditions...); err != nil {
return err
}
}
return nil
}
func (t transaction) update(
_ context.Context,
key *dal.Key,
updates []dal.Update,
preconditions ...dal.Precondition,
) error {
k := key.String()
s, err := t.tx.Get(k)
if err != nil {
if errors.Is(err, buntdb.ErrNotFound) {
err = dal.NewErrNotFoundByKey(key, err)
}
return err
}
data := make(map[string]interface{})
if err = json.Unmarshal([]byte(s), &data); err != nil {
return fmt.Errorf("failed to unmarshal data as JSON object: %v", err)
}
for _, update := range updates {
if update.Field != "" {
data[update.Field] = update.Value
}
}
b, err := json.Marshal(data)
if err != nil {
return fmt.Errorf("failed to unmarshal data as JSON object: %v", err)
}
_, _, err = t.tx.Set(k, string(b), nil)
if err != nil {
return err
}
return nil
}