Jakob Borg 916ec63af6 cmd/stdiscosrv: New discovery server (fixes #4618)
This is a new revision of the discovery server. Relevant changes and
non-changes:

- Protocol towards clients is unchanged.

- Recommended large scale design is still to be deployed nehind nginx (I
  tested, and it's still a lot faster at terminating TLS).

- Database backend is leveldb again, only. It scales enough, is easy to
  setup, and we don't need any backend to take care of.

- Server supports replication. This is a simple TCP channel - protect it
  with a firewall when deploying over the internet. (We deploy this within
  the same datacenter, and with firewall.) Any incoming client announces
  are sent over the replication channel(s) to other peer discosrvs.
  Incoming replication changes are applied to the database as if they came
  from clients, but without the TLS/certificate overhead.

- Metrics are exposed using the prometheus library, when enabled.

- The database values and replication protocol is protobuf, because JSON
  was quite CPU intensive when I tried that and benchmarked it.

- The "Retry-After" value for failed lookups gets slowly increased from
  a default of 120 seconds, by 5 seconds for each failed lookup,
  independently by each discosrv. This lowers the query load over time for
  clients that are never seen. The Retry-After maxes out at 3600 after a
  couple of weeks of this increase. The number of failed lookups is
  stored in the database, now and then (avoiding making each lookup a
  database put).

All in all this means clients can be pointed towards a cluster using
just multiple A / AAAA records to gain both load sharing and redundancy
(if one is down, clients will talk to the remaining ones).

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4648
2018-01-14 08:52:31 +00:00

114 lines
3.3 KiB
Plaintext

// Code generated by protoc-gen-go.
// source: imp.proto
// DO NOT EDIT!
package imp
import proto "github.com/golang/protobuf/proto"
import "math"
import "os"
import imp1 "imp2.pb"
// Reference proto & math imports to suppress error if they are not otherwise used.
var _ = proto.GetString
var _ = math.Inf
// Types from public import imp2.proto
type PubliclyImportedMessage imp1.PubliclyImportedMessage
func (this *PubliclyImportedMessage) Reset() { (*imp1.PubliclyImportedMessage)(this).Reset() }
func (this *PubliclyImportedMessage) String() string {
return (*imp1.PubliclyImportedMessage)(this).String()
}
// PubliclyImportedMessage from public import imp.proto
type ImportedMessage_Owner int32
const (
ImportedMessage_DAVE ImportedMessage_Owner = 1
ImportedMessage_MIKE ImportedMessage_Owner = 2
)
var ImportedMessage_Owner_name = map[int32]string{
1: "DAVE",
2: "MIKE",
}
var ImportedMessage_Owner_value = map[string]int32{
"DAVE": 1,
"MIKE": 2,
}
// NewImportedMessage_Owner is deprecated. Use x.Enum() instead.
func NewImportedMessage_Owner(x ImportedMessage_Owner) *ImportedMessage_Owner {
e := ImportedMessage_Owner(x)
return &e
}
func (x ImportedMessage_Owner) Enum() *ImportedMessage_Owner {
p := new(ImportedMessage_Owner)
*p = x
return p
}
func (x ImportedMessage_Owner) String() string {
return proto.EnumName(ImportedMessage_Owner_name, int32(x))
}
type ImportedMessage struct {
Field *int64 `protobuf:"varint,1,req,name=field" json:"field,omitempty"`
XXX_extensions map[int32][]byte `json:",omitempty"`
XXX_unrecognized []byte `json:",omitempty"`
}
func (this *ImportedMessage) Reset() { *this = ImportedMessage{} }
func (this *ImportedMessage) String() string { return proto.CompactTextString(this) }
var extRange_ImportedMessage = []proto.ExtensionRange{
proto.ExtensionRange{90, 100},
}
func (*ImportedMessage) ExtensionRangeArray() []proto.ExtensionRange {
return extRange_ImportedMessage
}
func (this *ImportedMessage) ExtensionMap() map[int32][]byte {
if this.XXX_extensions == nil {
this.XXX_extensions = make(map[int32][]byte)
}
return this.XXX_extensions
}
type ImportedExtendable struct {
XXX_extensions map[int32][]byte `json:",omitempty"`
XXX_unrecognized []byte `json:",omitempty"`
}
func (this *ImportedExtendable) Reset() { *this = ImportedExtendable{} }
func (this *ImportedExtendable) String() string { return proto.CompactTextString(this) }
func (this *ImportedExtendable) Marshal() ([]byte, error) {
return proto.MarshalMessageSet(this.ExtensionMap())
}
func (this *ImportedExtendable) Unmarshal(buf []byte) error {
return proto.UnmarshalMessageSet(buf, this.ExtensionMap())
}
// ensure ImportedExtendable satisfies proto.Marshaler and proto.Unmarshaler
var _ proto.Marshaler = (*ImportedExtendable)(nil)
var _ proto.Unmarshaler = (*ImportedExtendable)(nil)
var extRange_ImportedExtendable = []proto.ExtensionRange{
proto.ExtensionRange{100, 536870911},
}
func (*ImportedExtendable) ExtensionRangeArray() []proto.ExtensionRange {
return extRange_ImportedExtendable
}
func (this *ImportedExtendable) ExtensionMap() map[int32][]byte {
if this.XXX_extensions == nil {
this.XXX_extensions = make(map[int32][]byte)
}
return this.XXX_extensions
}
func init() {
proto.RegisterEnum("imp.ImportedMessage_Owner", ImportedMessage_Owner_name, ImportedMessage_Owner_value)
}