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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.
286 lines
7.0 KiB
Go
286 lines
7.0 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 *WalkDirOptions) 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 "Bucket":
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z.Bucket, err = dc.ReadString()
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if err != nil {
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err = msgp.WrapError(err, "Bucket")
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return
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}
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case "BaseDir":
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z.BaseDir, err = dc.ReadString()
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if err != nil {
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err = msgp.WrapError(err, "BaseDir")
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return
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}
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case "Recursive":
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z.Recursive, err = dc.ReadBool()
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if err != nil {
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err = msgp.WrapError(err, "Recursive")
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return
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}
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case "ReportNotFound":
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z.ReportNotFound, err = dc.ReadBool()
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if err != nil {
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err = msgp.WrapError(err, "ReportNotFound")
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return
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}
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case "FilterPrefix":
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z.FilterPrefix, err = dc.ReadString()
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if err != nil {
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err = msgp.WrapError(err, "FilterPrefix")
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return
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}
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case "ForwardTo":
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z.ForwardTo, err = dc.ReadString()
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if err != nil {
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err = msgp.WrapError(err, "ForwardTo")
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return
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}
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case "Limit":
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z.Limit, err = dc.ReadInt()
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if err != nil {
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err = msgp.WrapError(err, "Limit")
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return
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}
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case "DiskID":
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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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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 *WalkDirOptions) EncodeMsg(en *msgp.Writer) (err error) {
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// map header, size 8
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// write "Bucket"
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err = en.Append(0x88, 0xa6, 0x42, 0x75, 0x63, 0x6b, 0x65, 0x74)
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if err != nil {
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return
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}
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err = en.WriteString(z.Bucket)
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if err != nil {
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err = msgp.WrapError(err, "Bucket")
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return
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}
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// write "BaseDir"
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err = en.Append(0xa7, 0x42, 0x61, 0x73, 0x65, 0x44, 0x69, 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.BaseDir)
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if err != nil {
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err = msgp.WrapError(err, "BaseDir")
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return
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}
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// write "Recursive"
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err = en.Append(0xa9, 0x52, 0x65, 0x63, 0x75, 0x72, 0x73, 0x69, 0x76, 0x65)
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if err != nil {
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return
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}
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err = en.WriteBool(z.Recursive)
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if err != nil {
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err = msgp.WrapError(err, "Recursive")
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return
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}
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// write "ReportNotFound"
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err = en.Append(0xae, 0x52, 0x65, 0x70, 0x6f, 0x72, 0x74, 0x4e, 0x6f, 0x74, 0x46, 0x6f, 0x75, 0x6e, 0x64)
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if err != nil {
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return
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}
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err = en.WriteBool(z.ReportNotFound)
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if err != nil {
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err = msgp.WrapError(err, "ReportNotFound")
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return
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}
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// write "FilterPrefix"
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err = en.Append(0xac, 0x46, 0x69, 0x6c, 0x74, 0x65, 0x72, 0x50, 0x72, 0x65, 0x66, 0x69, 0x78)
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if err != nil {
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return
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}
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err = en.WriteString(z.FilterPrefix)
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if err != nil {
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err = msgp.WrapError(err, "FilterPrefix")
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return
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}
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// write "ForwardTo"
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err = en.Append(0xa9, 0x46, 0x6f, 0x72, 0x77, 0x61, 0x72, 0x64, 0x54, 0x6f)
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if err != nil {
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return
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}
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err = en.WriteString(z.ForwardTo)
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if err != nil {
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err = msgp.WrapError(err, "ForwardTo")
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return
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}
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// write "Limit"
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err = en.Append(0xa5, 0x4c, 0x69, 0x6d, 0x69, 0x74)
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if err != nil {
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return
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}
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err = en.WriteInt(z.Limit)
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if err != nil {
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err = msgp.WrapError(err, "Limit")
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return
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}
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// write "DiskID"
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err = en.Append(0xa6, 0x44, 0x69, 0x73, 0x6b, 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.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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return
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}
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// MarshalMsg implements msgp.Marshaler
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func (z *WalkDirOptions) MarshalMsg(b []byte) (o []byte, err error) {
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o = msgp.Require(b, z.Msgsize())
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// map header, size 8
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// string "Bucket"
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o = append(o, 0x88, 0xa6, 0x42, 0x75, 0x63, 0x6b, 0x65, 0x74)
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o = msgp.AppendString(o, z.Bucket)
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// string "BaseDir"
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o = append(o, 0xa7, 0x42, 0x61, 0x73, 0x65, 0x44, 0x69, 0x72)
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o = msgp.AppendString(o, z.BaseDir)
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// string "Recursive"
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o = append(o, 0xa9, 0x52, 0x65, 0x63, 0x75, 0x72, 0x73, 0x69, 0x76, 0x65)
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o = msgp.AppendBool(o, z.Recursive)
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// string "ReportNotFound"
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o = append(o, 0xae, 0x52, 0x65, 0x70, 0x6f, 0x72, 0x74, 0x4e, 0x6f, 0x74, 0x46, 0x6f, 0x75, 0x6e, 0x64)
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o = msgp.AppendBool(o, z.ReportNotFound)
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// string "FilterPrefix"
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o = append(o, 0xac, 0x46, 0x69, 0x6c, 0x74, 0x65, 0x72, 0x50, 0x72, 0x65, 0x66, 0x69, 0x78)
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o = msgp.AppendString(o, z.FilterPrefix)
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// string "ForwardTo"
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o = append(o, 0xa9, 0x46, 0x6f, 0x72, 0x77, 0x61, 0x72, 0x64, 0x54, 0x6f)
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o = msgp.AppendString(o, z.ForwardTo)
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// string "Limit"
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o = append(o, 0xa5, 0x4c, 0x69, 0x6d, 0x69, 0x74)
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o = msgp.AppendInt(o, z.Limit)
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// string "DiskID"
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o = append(o, 0xa6, 0x44, 0x69, 0x73, 0x6b, 0x49, 0x44)
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o = msgp.AppendString(o, z.DiskID)
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return
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}
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// UnmarshalMsg implements msgp.Unmarshaler
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func (z *WalkDirOptions) 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 "Bucket":
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z.Bucket, bts, err = msgp.ReadStringBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "Bucket")
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return
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}
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case "BaseDir":
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z.BaseDir, bts, err = msgp.ReadStringBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "BaseDir")
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return
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}
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case "Recursive":
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z.Recursive, bts, err = msgp.ReadBoolBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "Recursive")
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return
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}
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case "ReportNotFound":
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z.ReportNotFound, bts, err = msgp.ReadBoolBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "ReportNotFound")
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return
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}
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case "FilterPrefix":
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z.FilterPrefix, bts, err = msgp.ReadStringBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "FilterPrefix")
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return
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}
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case "ForwardTo":
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z.ForwardTo, bts, err = msgp.ReadStringBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "ForwardTo")
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return
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}
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case "Limit":
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z.Limit, bts, err = msgp.ReadIntBytes(bts)
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if err != nil {
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err = msgp.WrapError(err, "Limit")
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return
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}
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case "DiskID":
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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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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 *WalkDirOptions) Msgsize() (s int) {
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s = 1 + 7 + msgp.StringPrefixSize + len(z.Bucket) + 8 + msgp.StringPrefixSize + len(z.BaseDir) + 10 + msgp.BoolSize + 15 + msgp.BoolSize + 13 + msgp.StringPrefixSize + len(z.FilterPrefix) + 10 + msgp.StringPrefixSize + len(z.ForwardTo) + 6 + msgp.IntSize + 7 + msgp.StringPrefixSize + len(z.DiskID)
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return
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}
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