60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
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package consul
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import (
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"fmt"
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"time"
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"github.com/armon/go-metrics"
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"github.com/hashicorp/consul/consul/structs"
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)
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// Txn endpoint is used to perform multi-object atomic transactions.
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type Txn struct {
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srv *Server
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}
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// Apply is used to apply multiple operations in a single, atomic transaction.
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func (t *Txn) Apply(args *structs.KVSAtomicRequest, reply *structs.KVSAtomicResponse) error {
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if done, err := t.srv.forward("Txn.Apply", args, args, reply); done {
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return err
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}
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defer metrics.MeasureSince([]string{"consul", "txn", "apply"}, time.Now())
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// Perform the pre-apply checks on each of the operations.
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acl, err := t.srv.resolveToken(args.Token)
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if err != nil {
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return err
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}
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for i, op := range args.Ops {
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ok, err := kvsPreApply(t.srv, acl, op.Op, &op.DirEnt)
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if err != nil {
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reply.Errors = append(reply.Errors, &structs.KVSAtomicError{i, err.Error()})
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} else if !ok {
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err = fmt.Errorf("failed to lock key %q due to lock delay", op.DirEnt.Key)
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reply.Errors = append(reply.Errors, &structs.KVSAtomicError{i, err.Error()})
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}
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}
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if len(reply.Errors) > 0 {
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return nil
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}
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// Apply the update.
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resp, err := t.srv.raftApply(structs.KVSAtomicRequestType, args)
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if err != nil {
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t.srv.logger.Printf("[ERR] consul.kvs: ApplyAtomic failed: %v", err)
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return err
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}
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if respErr, ok := resp.(error); ok {
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return respErr
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}
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// Convert the return type. This should be a cheap copy since we are
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// just taking the two slices.
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if respAtomic, ok := resp.(structs.KVSAtomicResponse); ok {
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*reply = respAtomic
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} else {
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return fmt.Errorf("unexpected return type %T", resp)
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}
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return nil
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}
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