wehub-resource-sync
123 lines
3.7 KiB
Go
123 lines
3.7 KiB
Go
// Copyright 2025 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package conflicts
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import (
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"context"
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"github.com/cockroachdb/errors"
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"github.com/dolthub/doltgresql/core/rootobject/objinterface"
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"github.com/dolthub/doltgresql/utils"
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)
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// Serialize returns the Conflict as a byte slice. If the Conflict is invalid, then this returns a nil slice.
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func (conflict Conflict) Serialize(ctx context.Context) (_ []byte, err error) {
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if !conflict.ID.IsValid() {
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return nil, nil
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}
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// Write all of the conflicts to the writer
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writer := utils.NewWriter(512)
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writer.VariableUint(0) // Version
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// Serialize "ours", "theirs", and "ancestor"
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var ours, theirs, ancestor []byte
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if conflict.Ours != nil {
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ours, err = conflict.Ours.Serialize(ctx)
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if err != nil {
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return nil, err
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}
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}
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if conflict.Theirs != nil {
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theirs, err = conflict.Theirs.Serialize(ctx)
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if err != nil {
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return nil, err
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}
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}
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if conflict.Ancestor != nil {
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ancestor, err = conflict.Ancestor.Serialize(ctx)
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if err != nil {
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return nil, err
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}
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}
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// Write the conflict data
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writer.Id(conflict.ID)
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writer.String(conflict.FromHash)
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writer.Int64(int64(conflict.RootObjectID))
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writer.Bool(conflict.Ours != nil)
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writer.Bool(conflict.Theirs != nil)
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writer.Bool(conflict.Ancestor != nil)
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writer.ByteSlice(ours)
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writer.ByteSlice(theirs)
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writer.ByteSlice(ancestor)
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// Returns the data
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return writer.Data(), nil
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}
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// DeserializeConflict returns the Conflict that was serialized in the byte slice. Returns an empty Conflict (invalid
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// ID) if data is nil or empty.
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func DeserializeConflict(ctx context.Context, data []byte) (_ Conflict, err error) {
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if len(data) == 0 {
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return Conflict{}, nil
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}
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reader := utils.NewReader(data)
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version := reader.VariableUint()
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if version > 0 {
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return Conflict{}, errors.Errorf("version %d of conflicts is not supported, please upgrade the server", version)
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}
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// Read from the reader
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conflict := Conflict{}
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conflict.ID = reader.Id()
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conflict.FromHash = reader.String()
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conflict.RootObjectID = objinterface.RootObjectID(reader.Int64())
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hasOurs := reader.Bool()
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hasTheirs := reader.Bool()
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hasAncestor := reader.Bool()
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ours := reader.ByteSlice()
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theirs := reader.ByteSlice()
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ancestor := reader.ByteSlice()
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// Deserialize "ours", "theirs", and "ancestor"
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if hasOurs {
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conflict.Ours, err = DeserializeRootObject(ctx, conflict.RootObjectID, ours)
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if err != nil {
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return Conflict{}, err
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}
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}
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if hasTheirs {
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conflict.Theirs, err = DeserializeRootObject(ctx, conflict.RootObjectID, theirs)
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if err != nil {
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return Conflict{}, err
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}
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}
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if hasAncestor {
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conflict.Ancestor, err = DeserializeRootObject(ctx, conflict.RootObjectID, ancestor)
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if err != nil {
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return Conflict{}, err
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}
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}
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if !reader.IsEmpty() {
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return Conflict{}, errors.Errorf("extra data found while deserializing a conflict")
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}
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// Return the deserialized object
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return conflict, nil
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}
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// DeserializeRootObject handles root object deserialization, and is declared in a different package. It is assigned
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// here by an Init function to get around import cycles.
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var DeserializeRootObject = func(ctx context.Context, rootObjID objinterface.RootObjectID, data []byte) (objinterface.RootObject, error) {
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return nil, errors.New("DeserializeRootObject was never initialized")
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}
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