etcd structure

type revision struct {
  main int64
  sub int64
}
type generation struct {
	ver int64
	created revision
	revs []revision
}
type keyIndex struct {
	key []byte
	modified revision
	generations []generation
}

type KeyValue struct {
	// key is the key in bytes. An empty key is not allowed.
	Key []byte `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
	// create_revision is the revision of last creation on this key.
	CreateRevision int64 `protobuf:"varint,2,opt,name=create_revision,json=createRevision,proto3" json:"create_revision,omitempty"`
	// mod_revision is the revision of last modification on this key.
	ModRevision int64 `protobuf:"varint,3,opt,name=mod_revision,json=modRevision,proto3" json:"mod_revision,omitempty"`
	// version is the version of the key. A deletion resets
	// the version to zero and any modification of the key
	// increases its version.
	Version int64 `protobuf:"varint,4,opt,name=version,proto3" json:"version,omitempty"`
	// value is the value held by the key, in bytes.
	Value []byte `protobuf:"bytes,5,opt,name=value,proto3" json:"value,omitempty"`
	// lease is the ID of the lease that attached to key.
	// When the attached lease expires, the key will be deleted.
	// If lease is 0, then no lease is attached to the key.
	Lease                int64    `protobuf:"varint,6,opt,name=lease,proto3" json:"lease,omitempty"`
	XXX_NoUnkeyedLiteral struct{} `json:"-"`
	XXX_unrecognized     []byte   `json:"-"`
	XXX_sizecache        int32    `json:"-"`
}