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feat(go/tcp): begin Go TCP transport implementation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,19 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "log" | ||
|
|
||
| app "wrpc.io/examples/go/hello-client" | ||
| wrpctcp "wrpc.io/go/x/tcp" | ||
| ) | ||
|
|
||
| func run() error { | ||
| addr := "[::1]:7761" | ||
| return app.Run(addr, wrpctcp.NewClient(addr)) | ||
| } | ||
|
|
||
| func main() { | ||
| if err := run(); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| package wrpctcp | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "encoding/binary" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "math" | ||
| "net" | ||
|
|
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| wrpc "wrpc.io/go" | ||
| ) | ||
|
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| // Client is a thin wrapper around *net.TCPAddr, which is able to invoke wRPC functions | ||
| type Client struct { | ||
| addr string | ||
| } | ||
|
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| func NewClient(addr string) *Client { | ||
| return &Client{addr: addr} | ||
| } | ||
|
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| type paramWriter struct { | ||
| conn *net.TCPConn | ||
| } | ||
|
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| func (w *paramWriter) Write([]byte) (int, error) { | ||
| return 0, errors.New("not supported yet") | ||
| } | ||
|
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| func (w *paramWriter) WriteByte(byte) error { | ||
| return errors.New("not supported yet") | ||
| } | ||
|
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| func (*paramWriter) Index(path ...uint32) (wrpc.IndexWriteCloser, error) { | ||
| return nil, errors.New("not supported yet") | ||
| } | ||
|
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| func (w *paramWriter) Close() error { | ||
| return nil | ||
| // TODO: close the write side of connection | ||
| // return w.conn.CloseWrite() | ||
| } | ||
|
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| type streamReader struct { | ||
| conn *net.TCPConn | ||
| buffer *bytes.Buffer | ||
| } | ||
|
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| func (r *streamReader) Read(p []byte) (int, error) { | ||
| return r.buffer.Read(p) | ||
| } | ||
|
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| func (r *streamReader) ReadByte() (byte, error) { | ||
| return r.buffer.ReadByte() | ||
| } | ||
|
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| func (r *streamReader) Index(path ...uint32) (wrpc.IndexReadCloser, error) { | ||
| return nil, errors.New("not supported yet") | ||
| } | ||
|
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| func (r *streamReader) Close() error { | ||
| return nil | ||
| // TODO: close the write side of connection | ||
| // return r.conn.CloseRead() | ||
| } | ||
|
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| func (c *Client) Invoke(ctx context.Context, instance string, name string, buf []byte, paths ...wrpc.SubscribePath) (wrpc.IndexWriteCloser, wrpc.IndexReadCloser, error) { | ||
| addr, err := net.ResolveTCPAddr("tcp", c.addr) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("failed to resolve `%s` as TCP address: %w", c.addr, err) | ||
| } | ||
| conn, err := net.DialTCP("tcp", nil, addr) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("failed to establish TCP connection: %w", err) | ||
| } | ||
|
|
||
| if len(instance) > math.MaxUint32 { | ||
| return nil, nil, errors.New("instance length overflows uint32") | ||
| } | ||
| if len(name) > math.MaxUint32 { | ||
| return nil, nil, errors.New("name length overflows uint32") | ||
| } | ||
| if len(buf) > math.MaxUint32 { | ||
| return nil, nil, errors.New("buffer length overflows uint32") | ||
| } | ||
| // TODO: Count the exact amount of bytes required | ||
| payload := make( | ||
| []byte, | ||
| 1+ // version | ||
| binary.MaxVarintLen32+len(instance)+ | ||
| binary.MaxVarintLen32+len(name)+ | ||
| 1+ // empty path length | ||
| binary.MaxVarintLen32+len(buf), | ||
| ) | ||
| r := 1 // version == 0 | ||
|
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| l := r + binary.PutUvarint(payload[r:], uint64(len(instance))) | ||
| r = l + len(instance) | ||
| copy(payload[l:r], instance) | ||
|
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| l = r + binary.PutUvarint(payload[r:], uint64(len(name))) | ||
| r = l + len(name) | ||
| copy(payload[l:r], name) | ||
|
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| l = r + 1 /* empty path length */ + binary.PutUvarint(payload[r:], uint64(len(buf))) | ||
| r = l + len(buf) | ||
| copy(payload[l:r], buf) | ||
|
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| _, err = conn.Write(payload[:r]) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("failed to write initial frame: %w", err) | ||
| } | ||
| if err = conn.CloseWrite(); err != nil { | ||
| return nil, nil, fmt.Errorf("failed to close write side of TCP connection: %w", err) | ||
| } | ||
| var header [2]byte | ||
| _, err = io.ReadFull(conn, header[:]) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("failed to read response frame header: %w", err) | ||
| } | ||
| if header[0] != 0 { | ||
| return nil, nil, errors.New("asynchronous frames not supported yet") | ||
| } | ||
| n := header[1] | ||
| if n > 127 { | ||
| return nil, nil, errors.New("only decoding responses of up to 127 bytes is currently supported") | ||
| } | ||
| buf = make([]byte, n) | ||
| _, err = io.ReadFull(conn, buf) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("failed to read response frame payload: %w", err) | ||
| } | ||
| if err := conn.Close(); err != nil { | ||
| return nil, nil, fmt.Errorf("failed to close TCP connection: %w", err) | ||
| } | ||
| return ¶mWriter{ | ||
| conn: conn, | ||
| }, &streamReader{ | ||
| conn: conn, | ||
| buffer: bytes.NewBuffer(buf), | ||
| }, nil | ||
| } |
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