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position.go
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position.go
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// Copyright © 2022 Meroxa, Inc.
//
// 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.
package iterator
import (
"encoding/json"
"fmt"
sdk "github.com/conduitio/conduit-connector-sdk"
"vitess.io/vitess/go/vt/proto/binlogdata"
)
// Mode defines an iterator mode.
type Mode string
const (
// ModeSnapshot represents a snapshot iterator mode.
ModeSnapshot = "snapshot"
// ModeCDC represents a CDC iterator mode.
ModeCDC = "cdc"
)
// Position is a combined iterator's position.
type Position struct {
Mode Mode `json:"mode"`
// Keyspace holds a name of a VTGate keyspace that the connector interact with.
// Mode: snapshot, cdc.
Keyspace string `json:"keyspace"`
// LastProcessedElementValue is a value of the element
// at which the iterator stopped reading rows.
// The iterator will continue reading from the element if it's not empty.
// Mode: snapshot, cdc.
LastProcessedElementValue any `json:"last_processed_element_value,omitempty"`
// ShardGtids holds a list of shards which the connector will read events from.
// Mode: cdc.
ShardGtids []*binlogdata.ShardGtid `json:"shard_gtids,omitempty"`
}
// MarshalSDKPosition marshals the underlying position into a sdk.Position as JSON bytes.
func (p *Position) MarshalSDKPosition() (sdk.Position, error) {
positionBytes, err := json.Marshal(p)
if err != nil {
return nil, fmt.Errorf("marshal position: %w", err)
}
return sdk.Position(positionBytes), nil
}
// ParsePosition converts an sdk.Position into a Position.
func ParsePosition(sdkPosition sdk.Position) (*Position, error) {
var position Position
if sdkPosition == nil {
return nil, nil
}
if err := json.Unmarshal(sdkPosition, &position); err != nil {
return nil, fmt.Errorf("unmarshal sdk.Position into Position: %w", err)
}
return &position, nil
}