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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.
124 lines
2.3 KiB
Go
124 lines
2.3 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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"bytes"
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"testing"
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"github.com/tinylib/msgp/msgp"
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)
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func TestMarshalUnmarshalWalkDirOptions(t *testing.T) {
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v := WalkDirOptions{}
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bts, err := v.MarshalMsg(nil)
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if err != nil {
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t.Fatal(err)
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}
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left, err := v.UnmarshalMsg(bts)
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if err != nil {
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t.Fatal(err)
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}
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if len(left) > 0 {
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t.Errorf("%d bytes left over after UnmarshalMsg(): %q", len(left), left)
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}
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left, err = msgp.Skip(bts)
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if err != nil {
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t.Fatal(err)
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}
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if len(left) > 0 {
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t.Errorf("%d bytes left over after Skip(): %q", len(left), left)
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}
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}
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func BenchmarkMarshalMsgWalkDirOptions(b *testing.B) {
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v := WalkDirOptions{}
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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v.MarshalMsg(nil)
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}
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}
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func BenchmarkAppendMsgWalkDirOptions(b *testing.B) {
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v := WalkDirOptions{}
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bts := make([]byte, 0, v.Msgsize())
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bts, _ = v.MarshalMsg(bts[0:0])
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b.SetBytes(int64(len(bts)))
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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bts, _ = v.MarshalMsg(bts[0:0])
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}
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}
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func BenchmarkUnmarshalWalkDirOptions(b *testing.B) {
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v := WalkDirOptions{}
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bts, _ := v.MarshalMsg(nil)
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b.ReportAllocs()
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b.SetBytes(int64(len(bts)))
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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_, err := v.UnmarshalMsg(bts)
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if err != nil {
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b.Fatal(err)
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}
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}
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}
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func TestEncodeDecodeWalkDirOptions(t *testing.T) {
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v := WalkDirOptions{}
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var buf bytes.Buffer
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msgp.Encode(&buf, &v)
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m := v.Msgsize()
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if buf.Len() > m {
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t.Log("WARNING: TestEncodeDecodeWalkDirOptions Msgsize() is inaccurate")
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}
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vn := WalkDirOptions{}
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err := msgp.Decode(&buf, &vn)
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if err != nil {
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t.Error(err)
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}
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buf.Reset()
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msgp.Encode(&buf, &v)
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err = msgp.NewReader(&buf).Skip()
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if err != nil {
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t.Error(err)
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}
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}
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func BenchmarkEncodeWalkDirOptions(b *testing.B) {
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v := WalkDirOptions{}
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var buf bytes.Buffer
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msgp.Encode(&buf, &v)
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b.SetBytes(int64(buf.Len()))
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en := msgp.NewWriter(msgp.Nowhere)
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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v.EncodeMsg(en)
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}
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en.Flush()
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}
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func BenchmarkDecodeWalkDirOptions(b *testing.B) {
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v := WalkDirOptions{}
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var buf bytes.Buffer
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msgp.Encode(&buf, &v)
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b.SetBytes(int64(buf.Len()))
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rd := msgp.NewEndlessReader(buf.Bytes(), b)
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dc := msgp.NewReader(rd)
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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err := v.DecodeMsg(dc)
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if err != nil {
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b.Fatal(err)
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}
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}
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}
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