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checkpoint.go
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checkpoint.go
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package resharding
import (
"context"
"sync"
"github.com/golang/protobuf/proto"
"github.com/youtube/vitess/go/vt/topo"
workflowpb "github.com/youtube/vitess/go/vt/proto/workflow"
)
// CheckpointWriter saves the checkpoint data into topology server.
type CheckpointWriter struct {
topoServer topo.Server
// checkpointMu is used for protecting data access during checkpointing.
mu sync.Mutex
checkpoint *workflowpb.WorkflowCheckpoint
wi *topo.WorkflowInfo
}
// NewCheckpointWriter creates a CheckpointWriter.
func NewCheckpointWriter(ts topo.Server, checkpoint *workflowpb.WorkflowCheckpoint, wi *topo.WorkflowInfo) *CheckpointWriter {
return &CheckpointWriter{
topoServer: ts,
checkpoint: checkpoint,
wi: wi,
}
}
// UpdateTask updates the task status in the checkpointing copy and
// saves the full checkpoint to the topology server.
func (c *CheckpointWriter) UpdateTask(taskID string, status workflowpb.TaskState, err error) error {
c.mu.Lock()
defer c.mu.Unlock()
errorMessage := ""
if err != nil {
errorMessage = err.Error()
}
t := c.checkpoint.Tasks[taskID]
t.State = status
t.Error = errorMessage
return c.saveLocked()
}
func (c *CheckpointWriter) saveLocked() error {
var err error
c.wi.Data, err = proto.Marshal(c.checkpoint)
if err != nil {
return err
}
return c.topoServer.SaveWorkflow(context.TODO(), c.wi)
}