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.
419 lines
7.9 KiB
Go
419 lines
7.9 KiB
Go
package cmd
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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 *nsScannerOptions) 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 "id":
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z.DiskID, err = dc.ReadString()
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if err != nil {
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err = msgp.WrapError(err, "DiskID")
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return
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}
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case "m":
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z.ScanMode, err = dc.ReadInt()
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if err != nil {
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err = msgp.WrapError(err, "ScanMode")
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return
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}
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case "c":
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if dc.IsNil() {
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err = dc.ReadNil()
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if err != nil {
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err = msgp.WrapError(err, "Cache")
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return
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}
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z.Cache = nil
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} else {
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if z.Cache == nil {
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z.Cache = new(dataUsageCache)
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}
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err = z.Cache.DecodeMsg(dc)
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if err != nil {
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err = msgp.WrapError(err, "Cache")
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return
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}
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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 *nsScannerOptions) EncodeMsg(en *msgp.Writer) (err error) {
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// map header, size 3
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// write "id"
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err = en.Append(0x83, 0xa2, 0x69, 0x64)
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if err != nil {
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return
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}
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err = en.WriteString(z.DiskID)
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if err != nil {
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err = msgp.WrapError(err, "DiskID")
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return
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}
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// write "m"
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err = en.Append(0xa1, 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.ScanMode)
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if err != nil {
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err = msgp.WrapError(err, "ScanMode")
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return
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}
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// write "c"
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err = en.Append(0xa1, 0x63)
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if err != nil {
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return
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}
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if z.Cache == nil {
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err = en.WriteNil()
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if err != nil {
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return
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}
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} else {
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err = z.Cache.EncodeMsg(en)
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if err != nil {
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err = msgp.WrapError(err, "Cache")
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return
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}
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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 *nsScannerOptions) MarshalMsg(b []byte) (o []byte, err error) {
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o = msgp.Require(b, z.Msgsize())
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// map header, size 3
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// string "id"
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o = append(o, 0x83, 0xa2, 0x69, 0x64)
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o = msgp.AppendString(o, z.DiskID)
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// string "m"
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o = append(o, 0xa1, 0x6d)
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o = msgp.AppendInt(o, z.ScanMode)
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// string "c"
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o = append(o, 0xa1, 0x63)
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if z.Cache == nil {
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o = msgp.AppendNil(o)
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} else {
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o, err = z.Cache.MarshalMsg(o)
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if err != nil {
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err = msgp.WrapError(err, "Cache")
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return
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}
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}
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return
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}
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// UnmarshalMsg implements msgp.Unmarshaler
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func (z *nsScannerOptions) 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 "id":
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z.DiskID, bts, err = msgp.ReadStringBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "DiskID")
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return
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}
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case "m":
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z.ScanMode, bts, err = msgp.ReadIntBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "ScanMode")
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return
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}
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case "c":
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if msgp.IsNil(bts) {
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bts, err = msgp.ReadNilBytes(bts)
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if err != nil {
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return
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}
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z.Cache = nil
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} else {
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if z.Cache == nil {
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z.Cache = new(dataUsageCache)
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}
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bts, err = z.Cache.UnmarshalMsg(bts)
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if err != nil {
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err = msgp.WrapError(err, "Cache")
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return
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}
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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 *nsScannerOptions) Msgsize() (s int) {
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s = 1 + 3 + msgp.StringPrefixSize + len(z.DiskID) + 2 + msgp.IntSize + 2
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if z.Cache == nil {
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s += msgp.NilSize
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} else {
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s += z.Cache.Msgsize()
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}
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return
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}
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// DecodeMsg implements msgp.Decodable
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func (z *nsScannerResp) 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 "u":
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if dc.IsNil() {
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err = dc.ReadNil()
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if err != nil {
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err = msgp.WrapError(err, "Update")
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return
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}
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z.Update = nil
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} else {
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if z.Update == nil {
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z.Update = new(dataUsageEntry)
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}
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err = z.Update.DecodeMsg(dc)
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if err != nil {
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err = msgp.WrapError(err, "Update")
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return
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}
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}
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case "f":
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if dc.IsNil() {
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err = dc.ReadNil()
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if err != nil {
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err = msgp.WrapError(err, "Final")
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return
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}
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z.Final = nil
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} else {
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if z.Final == nil {
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z.Final = new(dataUsageCache)
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}
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err = z.Final.DecodeMsg(dc)
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if err != nil {
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err = msgp.WrapError(err, "Final")
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return
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}
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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 *nsScannerResp) EncodeMsg(en *msgp.Writer) (err error) {
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// map header, size 2
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// write "u"
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err = en.Append(0x82, 0xa1, 0x75)
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if err != nil {
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return
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}
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if z.Update == nil {
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err = en.WriteNil()
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if err != nil {
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return
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}
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} else {
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err = z.Update.EncodeMsg(en)
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if err != nil {
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err = msgp.WrapError(err, "Update")
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return
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}
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}
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// write "f"
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err = en.Append(0xa1, 0x66)
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if err != nil {
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return
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}
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if z.Final == nil {
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err = en.WriteNil()
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if err != nil {
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return
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}
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} else {
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err = z.Final.EncodeMsg(en)
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if err != nil {
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err = msgp.WrapError(err, "Final")
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return
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}
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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 *nsScannerResp) 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 "u"
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o = append(o, 0x82, 0xa1, 0x75)
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if z.Update == nil {
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o = msgp.AppendNil(o)
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} else {
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o, err = z.Update.MarshalMsg(o)
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if err != nil {
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err = msgp.WrapError(err, "Update")
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return
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}
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}
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// string "f"
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o = append(o, 0xa1, 0x66)
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if z.Final == nil {
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o = msgp.AppendNil(o)
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} else {
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o, err = z.Final.MarshalMsg(o)
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if err != nil {
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err = msgp.WrapError(err, "Final")
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return
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}
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}
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return
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}
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// UnmarshalMsg implements msgp.Unmarshaler
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func (z *nsScannerResp) 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 "u":
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if msgp.IsNil(bts) {
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bts, err = msgp.ReadNilBytes(bts)
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if err != nil {
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return
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}
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z.Update = nil
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} else {
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if z.Update == nil {
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z.Update = new(dataUsageEntry)
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}
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bts, err = z.Update.UnmarshalMsg(bts)
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if err != nil {
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err = msgp.WrapError(err, "Update")
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return
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}
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}
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case "f":
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if msgp.IsNil(bts) {
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bts, err = msgp.ReadNilBytes(bts)
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if err != nil {
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return
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}
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z.Final = nil
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} else {
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if z.Final == nil {
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z.Final = new(dataUsageCache)
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}
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bts, err = z.Final.UnmarshalMsg(bts)
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if err != nil {
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err = msgp.WrapError(err, "Final")
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return
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}
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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 *nsScannerResp) Msgsize() (s int) {
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s = 1 + 2
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if z.Update == nil {
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s += msgp.NilSize
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} else {
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s += z.Update.Msgsize()
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}
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s += 2
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if z.Final == nil {
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s += msgp.NilSize
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} else {
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s += z.Final.Msgsize()
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}
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return
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}
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