/
manager.go
84 lines (68 loc) · 2.08 KB
/
manager.go
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package storage
import (
"bytes"
"context"
"encoding/json"
"github.com/open-policy-agent/opa/storage"
"github.com/open-policy-agent/opa/storage/inmem"
"github.com/pkg/errors"
)
type Manager interface {
Get(ctx context.Context, collection string, key string, value interface{}) error
List(ctx context.Context, collection string, value interface{}, limit, offset int) error
Upsert(ctx context.Context, collection string, key string, value interface{}) error
Delete(ctx context.Context, collection string, key string) error
Storage(ctx context.Context, schema string, collections []string) (storage.Store, error)
}
func roundTrip(in, out interface{}) error {
var b bytes.Buffer
if err := json.NewEncoder(&b).Encode(in); err != nil {
return errors.WithStack(err)
}
dec := json.NewDecoder(&b)
dec.DisallowUnknownFields()
if err := dec.Decode(out); err != nil {
return errors.WithStack(err)
}
return nil
}
func toRegoStore(ctx context.Context, schema string, collections []string, query func(context.Context, string) ([]json.RawMessage, error)) (storage.Store, error) {
var s map[string]interface{}
dec := json.NewDecoder(bytes.NewBufferString(schema))
dec.UseNumber()
if err := dec.Decode(&s); err != nil {
return nil, errors.WithStack(err)
}
db := inmem.NewFromObject(s)
txn, err := db.NewTransaction(ctx, storage.WriteParams)
if err != nil {
return nil, errors.WithStack(err)
}
for _, c := range collections {
path, ok := storage.ParsePath(c)
if !ok {
return nil, errors.Errorf("unable to parse storage path: %s", c)
}
var val []interface{}
var b bytes.Buffer
d, err := query(ctx, c)
if err != nil {
return nil, err
}
if err := json.NewEncoder(&b).Encode(d); err != nil {
return nil, errors.WithStack(err)
}
dec := json.NewDecoder(&b)
dec.UseNumber()
if err := dec.Decode(&val); err != nil {
return nil, errors.WithStack(err)
}
if err := db.Write(ctx, txn, storage.AddOp, path, val); err != nil {
return nil, errors.WithStack(err)
}
}
if err := db.Commit(ctx, txn); err != nil {
return nil, errors.WithStack(err)
}
return db, nil
}