/
extend_solution.go
48 lines (44 loc) · 1.02 KB
/
extend_solution.go
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package api
import (
"context"
"github.com/imos/icfpc2019/go/util/db"
"github.com/imos/icfpc2019/go/util/pb"
"github.com/pkg/errors"
)
func extendSolutionHandler(
ctx context.Context, apiReq *pb.Api_Request, apiResp *pb.Api_Response,
) error {
req := apiReq.GetExtendSolution()
resp := &pb.Api_Response_ExtendSolution{}
if req == nil {
return nil
}
tx, err := db.DB().BeginTxx(ctx, nil)
if err != nil {
return errors.WithStack(err)
}
if err := func() error {
result, err := tx.ExecContext(ctx, `
UPDATE solutions
SET solution_lock = NOW() + INTERVAL 2 MINUTE
WHERE solution_id = ? AND NOW() < solution_lock
LIMIT 1`, req.GetSolutionId())
if err != nil {
return errors.WithStack(err)
}
affected, err := result.RowsAffected()
if err != nil {
return errors.WithStack(err)
}
if affected == 0 {
return errors.Errorf(
"failed to lock solution: %d", req.GetSolutionId())
}
return nil
}(); err != nil {
tx.Rollback()
return err
}
apiResp.ExtendSolution = resp
return tx.Commit()
}