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webhook_query.go
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webhook_query.go
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// Copyright 2023 The Cockroach Authors
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0
package cdc
import (
"context"
"encoding/json"
"io"
"github.com/cockroachdb/cdc-sink/internal/types"
"github.com/cockroachdb/cdc-sink/internal/util/hlc"
"github.com/cockroachdb/cdc-sink/internal/util/ident"
"github.com/pkg/errors"
)
// webhookForQuery responds to the v23.1 webhook scheme for cdc feeds with queries.
// We expect the CREATE CHANGE FEED INTO ... AS ... to use the following options:
// envelope="wrapped",format="json",diff
func (h *Handler) webhookForQuery(ctx context.Context, req *request) error {
table := req.target.(ident.Table)
conveyor, err := h.Conveyors.Get(table.Schema())
if err != nil {
return err
}
keys, err := h.getPrimaryKey(req)
if err != nil {
return err
}
var message struct {
Payload []json.RawMessage `json:"payload"`
Length int `json:"length"`
// With envelope="bare" (default for queries), there is a `__crdb__` property.
Bare json.RawMessage `json:"__crdb__"`
// With envelope="wrapped" there is `resolved` property.
Resolved string `json:"resolved"`
}
dec := json.NewDecoder(req.body)
dec.DisallowUnknownFields()
dec.UseNumber()
if err := dec.Decode(&message); err != nil {
// Empty input is a no-op.
if errors.Is(err, io.EOF) {
return nil
}
return errors.Wrap(err, "could not decode payload")
}
// Bare messages are not longer supported.
if message.Bare != nil {
return errors.New(bareEnvelopeErrorMsg)
}
// Check if it is a resolved message.
if message.Resolved != "" {
timestamp, err := hlc.Parse(message.Resolved)
if err != nil {
return err
}
req.timestamp = timestamp
return h.resolved(ctx, req)
}
// Aggregate the mutations by target table. We know that the default
// batch size for webhooks is reasonable.
toProcess := &types.MultiBatch{}
for _, payload := range message.Payload {
qp := queryPayload{
keys: keys,
}
if err := qp.UnmarshalJSON(payload); err != nil {
return err
}
mut, err := qp.AsMutation()
if err != nil {
return err
}
// Discard phantom deletes.
if mut.IsDelete() && mut.Key == nil {
continue
}
if err := toProcess.Accumulate(table, mut); err != nil {
return err
}
}
return conveyor.AcceptMultiBatch(ctx, toProcess, &types.AcceptOptions{})
}