mirror of
https://github.com/minio/minio.git
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51aa59a737
This PR adds a WebSocket grid feature that allows servers to communicate via
a single two-way connection.
There are two request types:
* Single requests, which are `[]byte => ([]byte, error)`. This is for efficient small
roundtrips with small payloads.
* Streaming requests which are `[]byte, chan []byte => chan []byte (and error)`,
which allows for different combinations of full two-way streams with an initial payload.
Only a single stream is created between two machines - and there is, as such, no
server/client relation since both sides can initiate and handle requests. Which server
initiates the request is decided deterministically on the server names.
Requests are made through a mux client and server, which handles message
passing, congestion, cancelation, timeouts, etc.
If a connection is lost, all requests are canceled, and the calling server will try
to reconnect. Registered handlers can operate directly on byte
slices or use a higher-level generics abstraction.
There is no versioning of handlers/clients, and incompatible changes should
be handled by adding new handlers.
The request path can be changed to a new one for any protocol changes.
First, all servers create a "Manager." The manager must know its address
as well as all remote addresses. This will manage all connections.
To get a connection to any remote, ask the manager to provide it given
the remote address using.
```
func (m *Manager) Connection(host string) *Connection
```
All serverside handlers must also be registered on the manager. This will
make sure that all incoming requests are served. The number of in-flight
requests and responses must also be given for streaming requests.
The "Connection" returned manages the mux-clients. Requests issued
to the connection will be sent to the remote.
* `func (c *Connection) Request(ctx context.Context, h HandlerID, req []byte) ([]byte, error)`
performs a single request and returns the result. Any deadline provided on the request is
forwarded to the server, and canceling the context will make the function return at once.
* `func (c *Connection) NewStream(ctx context.Context, h HandlerID, payload []byte) (st *Stream, err error)`
will initiate a remote call and send the initial payload.
```Go
// A Stream is a two-way stream.
// All responses *must* be read by the caller.
// If the call is canceled through the context,
//The appropriate error will be returned.
type Stream struct {
// Responses from the remote server.
// Channel will be closed after an error or when the remote closes.
// All responses *must* be read by the caller until either an error is returned or the channel is closed.
// Canceling the context will cause the context cancellation error to be returned.
Responses <-chan Response
// Requests sent to the server.
// If the handler is defined with 0 incoming capacity this will be nil.
// Channel *must* be closed to signal the end of the stream.
// If the request context is canceled, the stream will no longer process requests.
Requests chan<- []byte
}
type Response struct {
Msg []byte
Err error
}
```
There are generic versions of the server/client handlers that allow the use of type
safe implementations for data types that support msgpack marshal/unmarshal.
439 lines
9.5 KiB
Go
439 lines
9.5 KiB
Go
package dsync
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// Code generated by github.com/tinylib/msgp DO NOT EDIT.
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import (
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"github.com/tinylib/msgp/msgp"
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)
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// DecodeMsg implements msgp.Decodable
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func (z *LockArgs) DecodeMsg(dc *msgp.Reader) (err error) {
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var field []byte
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_ = field
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var zb0001 uint32
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zb0001, err = dc.ReadMapHeader()
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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for zb0001 > 0 {
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zb0001--
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field, err = dc.ReadMapKeyPtr()
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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switch msgp.UnsafeString(field) {
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case "UID":
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z.UID, err = dc.ReadString()
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if err != nil {
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err = msgp.WrapError(err, "UID")
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return
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}
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case "Resources":
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var zb0002 uint32
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zb0002, err = dc.ReadArrayHeader()
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if err != nil {
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err = msgp.WrapError(err, "Resources")
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return
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}
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if cap(z.Resources) >= int(zb0002) {
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z.Resources = (z.Resources)[:zb0002]
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} else {
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z.Resources = make([]string, zb0002)
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}
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for za0001 := range z.Resources {
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z.Resources[za0001], err = dc.ReadString()
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if err != nil {
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err = msgp.WrapError(err, "Resources", za0001)
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return
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}
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}
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case "Source":
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z.Source, err = dc.ReadString()
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if err != nil {
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err = msgp.WrapError(err, "Source")
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return
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}
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case "Owner":
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z.Owner, err = dc.ReadString()
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if err != nil {
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err = msgp.WrapError(err, "Owner")
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return
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}
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case "Quorum":
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z.Quorum, err = dc.ReadInt()
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if err != nil {
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err = msgp.WrapError(err, "Quorum")
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return
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}
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default:
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err = dc.Skip()
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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}
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}
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return
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}
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// EncodeMsg implements msgp.Encodable
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func (z *LockArgs) EncodeMsg(en *msgp.Writer) (err error) {
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// map header, size 5
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// write "UID"
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err = en.Append(0x85, 0xa3, 0x55, 0x49, 0x44)
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if err != nil {
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return
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}
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err = en.WriteString(z.UID)
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if err != nil {
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err = msgp.WrapError(err, "UID")
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return
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}
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// write "Resources"
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err = en.Append(0xa9, 0x52, 0x65, 0x73, 0x6f, 0x75, 0x72, 0x63, 0x65, 0x73)
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if err != nil {
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return
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}
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err = en.WriteArrayHeader(uint32(len(z.Resources)))
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if err != nil {
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err = msgp.WrapError(err, "Resources")
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return
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}
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for za0001 := range z.Resources {
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err = en.WriteString(z.Resources[za0001])
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if err != nil {
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err = msgp.WrapError(err, "Resources", za0001)
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return
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}
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}
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// write "Source"
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err = en.Append(0xa6, 0x53, 0x6f, 0x75, 0x72, 0x63, 0x65)
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if err != nil {
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return
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}
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err = en.WriteString(z.Source)
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if err != nil {
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err = msgp.WrapError(err, "Source")
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return
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}
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// write "Owner"
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err = en.Append(0xa5, 0x4f, 0x77, 0x6e, 0x65, 0x72)
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if err != nil {
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return
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}
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err = en.WriteString(z.Owner)
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if err != nil {
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err = msgp.WrapError(err, "Owner")
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return
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}
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// write "Quorum"
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err = en.Append(0xa6, 0x51, 0x75, 0x6f, 0x72, 0x75, 0x6d)
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if err != nil {
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return
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}
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err = en.WriteInt(z.Quorum)
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if err != nil {
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err = msgp.WrapError(err, "Quorum")
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return
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}
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return
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}
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// MarshalMsg implements msgp.Marshaler
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func (z *LockArgs) MarshalMsg(b []byte) (o []byte, err error) {
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o = msgp.Require(b, z.Msgsize())
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// map header, size 5
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// string "UID"
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o = append(o, 0x85, 0xa3, 0x55, 0x49, 0x44)
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o = msgp.AppendString(o, z.UID)
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// string "Resources"
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o = append(o, 0xa9, 0x52, 0x65, 0x73, 0x6f, 0x75, 0x72, 0x63, 0x65, 0x73)
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o = msgp.AppendArrayHeader(o, uint32(len(z.Resources)))
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for za0001 := range z.Resources {
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o = msgp.AppendString(o, z.Resources[za0001])
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}
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// string "Source"
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o = append(o, 0xa6, 0x53, 0x6f, 0x75, 0x72, 0x63, 0x65)
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o = msgp.AppendString(o, z.Source)
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// string "Owner"
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o = append(o, 0xa5, 0x4f, 0x77, 0x6e, 0x65, 0x72)
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o = msgp.AppendString(o, z.Owner)
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// string "Quorum"
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o = append(o, 0xa6, 0x51, 0x75, 0x6f, 0x72, 0x75, 0x6d)
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o = msgp.AppendInt(o, z.Quorum)
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return
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}
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// UnmarshalMsg implements msgp.Unmarshaler
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func (z *LockArgs) UnmarshalMsg(bts []byte) (o []byte, err error) {
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var field []byte
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_ = field
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var zb0001 uint32
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zb0001, bts, err = msgp.ReadMapHeaderBytes(bts)
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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for zb0001 > 0 {
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zb0001--
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field, bts, err = msgp.ReadMapKeyZC(bts)
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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switch msgp.UnsafeString(field) {
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case "UID":
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z.UID, bts, err = msgp.ReadStringBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "UID")
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return
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}
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case "Resources":
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var zb0002 uint32
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zb0002, bts, err = msgp.ReadArrayHeaderBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "Resources")
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return
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}
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if cap(z.Resources) >= int(zb0002) {
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z.Resources = (z.Resources)[:zb0002]
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} else {
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z.Resources = make([]string, zb0002)
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}
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for za0001 := range z.Resources {
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z.Resources[za0001], bts, err = msgp.ReadStringBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "Resources", za0001)
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return
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}
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}
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case "Source":
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z.Source, bts, err = msgp.ReadStringBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "Source")
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return
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}
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case "Owner":
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z.Owner, bts, err = msgp.ReadStringBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "Owner")
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return
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}
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case "Quorum":
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z.Quorum, bts, err = msgp.ReadIntBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "Quorum")
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return
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}
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default:
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bts, err = msgp.Skip(bts)
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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}
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}
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o = bts
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return
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}
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// Msgsize returns an upper bound estimate of the number of bytes occupied by the serialized message
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func (z *LockArgs) Msgsize() (s int) {
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s = 1 + 4 + msgp.StringPrefixSize + len(z.UID) + 10 + msgp.ArrayHeaderSize
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for za0001 := range z.Resources {
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s += msgp.StringPrefixSize + len(z.Resources[za0001])
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}
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s += 7 + msgp.StringPrefixSize + len(z.Source) + 6 + msgp.StringPrefixSize + len(z.Owner) + 7 + msgp.IntSize
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return
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}
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// DecodeMsg implements msgp.Decodable
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func (z *LockResp) DecodeMsg(dc *msgp.Reader) (err error) {
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var field []byte
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_ = field
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var zb0001 uint32
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zb0001, err = dc.ReadMapHeader()
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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for zb0001 > 0 {
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zb0001--
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field, err = dc.ReadMapKeyPtr()
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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switch msgp.UnsafeString(field) {
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case "Code":
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{
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var zb0002 uint8
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zb0002, err = dc.ReadUint8()
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if err != nil {
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err = msgp.WrapError(err, "Code")
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return
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}
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z.Code = ResponseCode(zb0002)
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}
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case "Err":
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z.Err, err = dc.ReadString()
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if err != nil {
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err = msgp.WrapError(err, "Err")
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return
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}
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default:
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err = dc.Skip()
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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}
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}
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return
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}
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// EncodeMsg implements msgp.Encodable
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func (z LockResp) EncodeMsg(en *msgp.Writer) (err error) {
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// map header, size 2
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// write "Code"
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err = en.Append(0x82, 0xa4, 0x43, 0x6f, 0x64, 0x65)
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if err != nil {
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return
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}
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err = en.WriteUint8(uint8(z.Code))
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if err != nil {
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err = msgp.WrapError(err, "Code")
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return
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}
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// write "Err"
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err = en.Append(0xa3, 0x45, 0x72, 0x72)
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if err != nil {
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return
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}
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err = en.WriteString(z.Err)
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if err != nil {
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err = msgp.WrapError(err, "Err")
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return
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}
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return
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}
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// MarshalMsg implements msgp.Marshaler
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func (z LockResp) MarshalMsg(b []byte) (o []byte, err error) {
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o = msgp.Require(b, z.Msgsize())
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// map header, size 2
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// string "Code"
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o = append(o, 0x82, 0xa4, 0x43, 0x6f, 0x64, 0x65)
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o = msgp.AppendUint8(o, uint8(z.Code))
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// string "Err"
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o = append(o, 0xa3, 0x45, 0x72, 0x72)
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o = msgp.AppendString(o, z.Err)
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return
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}
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// UnmarshalMsg implements msgp.Unmarshaler
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func (z *LockResp) UnmarshalMsg(bts []byte) (o []byte, err error) {
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var field []byte
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_ = field
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var zb0001 uint32
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zb0001, bts, err = msgp.ReadMapHeaderBytes(bts)
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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for zb0001 > 0 {
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zb0001--
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field, bts, err = msgp.ReadMapKeyZC(bts)
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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switch msgp.UnsafeString(field) {
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case "Code":
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{
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var zb0002 uint8
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zb0002, bts, err = msgp.ReadUint8Bytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "Code")
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return
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}
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z.Code = ResponseCode(zb0002)
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}
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case "Err":
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z.Err, bts, err = msgp.ReadStringBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "Err")
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return
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}
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default:
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bts, err = msgp.Skip(bts)
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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}
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}
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o = bts
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return
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}
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// Msgsize returns an upper bound estimate of the number of bytes occupied by the serialized message
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func (z LockResp) Msgsize() (s int) {
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s = 1 + 5 + msgp.Uint8Size + 4 + msgp.StringPrefixSize + len(z.Err)
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return
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}
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// DecodeMsg implements msgp.Decodable
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func (z *ResponseCode) DecodeMsg(dc *msgp.Reader) (err error) {
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{
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var zb0001 uint8
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zb0001, err = dc.ReadUint8()
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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(*z) = ResponseCode(zb0001)
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}
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return
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}
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// EncodeMsg implements msgp.Encodable
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func (z ResponseCode) EncodeMsg(en *msgp.Writer) (err error) {
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err = en.WriteUint8(uint8(z))
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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return
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}
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// MarshalMsg implements msgp.Marshaler
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func (z ResponseCode) MarshalMsg(b []byte) (o []byte, err error) {
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o = msgp.Require(b, z.Msgsize())
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o = msgp.AppendUint8(o, uint8(z))
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return
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}
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// UnmarshalMsg implements msgp.Unmarshaler
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func (z *ResponseCode) UnmarshalMsg(bts []byte) (o []byte, err error) {
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{
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var zb0001 uint8
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zb0001, bts, err = msgp.ReadUint8Bytes(bts)
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if err != nil {
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err = msgp.WrapError(err)
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return
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}
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(*z) = ResponseCode(zb0001)
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}
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o = bts
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return
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}
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// Msgsize returns an upper bound estimate of the number of bytes occupied by the serialized message
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func (z ResponseCode) Msgsize() (s int) {
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s = msgp.Uint8Size
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return
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}
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