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feat: client support send bytes method
Signed-off-by: ZhangJian He <shoothzj@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,20 +1,176 @@ | ||
| package opcua | ||
|
|
||
| import "log/slog" | ||
| import ( | ||
| "crypto/tls" | ||
| "fmt" | ||
| "github.com/shoothzj/gox/buffer" | ||
| "github.com/shoothzj/gox/netx" | ||
| "log/slog" | ||
| "net" | ||
| "sync" | ||
| ) | ||
|
|
||
| type ClientConfig struct { | ||
| logger *slog.Logger | ||
| Address netx.Address | ||
| BufferMax int | ||
| SendQueueSize int | ||
| PendingQueueSize int | ||
| TlsConfig *tls.Config | ||
|
|
||
| Logger *slog.Logger | ||
| } | ||
|
|
||
| type sendRequest struct { | ||
| bytes []byte | ||
| callback func([]byte, error) | ||
| } | ||
|
|
||
| type Client struct { | ||
| config *ClientConfig | ||
| logger *slog.Logger | ||
|
|
||
| conn net.Conn | ||
| eventsChan chan *sendRequest | ||
| pendingQueue chan *sendRequest | ||
| buffer *buffer.Buffer | ||
| closeCh chan struct{} | ||
| } | ||
|
|
||
| func (c *Client) Send(bytes []byte) ([]byte, error) { | ||
| wg := sync.WaitGroup{} | ||
| wg.Add(1) | ||
| var result []byte | ||
| var err error | ||
| c.sendAsync(bytes, func(resp []byte, e error) { | ||
| result = resp | ||
| err = e | ||
| wg.Done() | ||
| }) | ||
| wg.Wait() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return result, nil | ||
| } | ||
|
|
||
| func (c *Client) sendAsync(bytes []byte, callback func([]byte, error)) { | ||
| sr := &sendRequest{ | ||
| bytes: bytes, | ||
| callback: callback, | ||
| } | ||
| c.eventsChan <- sr | ||
| } | ||
|
|
||
| func (c *Client) read() { | ||
| for { | ||
| select { | ||
| case req := <-c.pendingQueue: | ||
| n, err := c.conn.Read(c.buffer.WritableSlice()) | ||
| if err != nil { | ||
| req.callback(nil, err) | ||
| c.closeCh <- struct{}{} | ||
| break | ||
| } | ||
| err = c.buffer.AdjustWriteCursor(n) | ||
| if err != nil { | ||
| req.callback(nil, err) | ||
| c.closeCh <- struct{}{} | ||
| break | ||
| } | ||
| if c.buffer.Size() < 4 { | ||
| continue | ||
| } | ||
| bytes := make([]byte, 4) | ||
| err = c.buffer.ReadExactly(bytes) | ||
| c.buffer.Compact() | ||
| if err != nil { | ||
| req.callback(nil, err) | ||
| c.closeCh <- struct{}{} | ||
| break | ||
| } | ||
| length := int(bytes[3]) | int(bytes[2])<<8 | int(bytes[1])<<16 | int(bytes[0])<<24 | ||
| if c.buffer.Size() < length { | ||
| continue | ||
| } | ||
| // in case ddos attack | ||
| if length > c.buffer.Capacity() { | ||
| req.callback(nil, fmt.Errorf("response length %d is too large", length)) | ||
| c.closeCh <- struct{}{} | ||
| break | ||
| } | ||
| data := make([]byte, length) | ||
| err = c.buffer.ReadExactly(data) | ||
| if err != nil { | ||
| req.callback(nil, err) | ||
| c.closeCh <- struct{}{} | ||
| break | ||
| } | ||
| c.buffer.Compact() | ||
| req.callback(data, nil) | ||
| case <-c.closeCh: | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (c *Client) write() { | ||
| for { | ||
| select { | ||
| case req := <-c.eventsChan: | ||
| n, err := c.conn.Write(req.bytes) | ||
| if err != nil { | ||
| req.callback(nil, err) | ||
| c.closeCh <- struct{}{} | ||
| break | ||
| } | ||
| if n != len(req.bytes) { | ||
| req.callback(nil, fmt.Errorf("write %d bytes, but expect %d bytes", n, len(req.bytes))) | ||
| c.closeCh <- struct{}{} | ||
| break | ||
| } | ||
| c.pendingQueue <- req | ||
| case <-c.closeCh: | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func NewClient(config *ClientConfig) *Client { | ||
| func (c *Client) Close() { | ||
| _ = c.conn.Close() | ||
| c.closeCh <- struct{}{} | ||
| } | ||
|
|
||
| func NewClient(config *ClientConfig) (*Client, error) { | ||
| conn, err := netx.Dial(config.Address, config.TlsConfig) | ||
|
|
||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if config.SendQueueSize == 0 { | ||
| config.SendQueueSize = 1000 | ||
| } | ||
| if config.PendingQueueSize == 0 { | ||
| config.PendingQueueSize = 1000 | ||
| } | ||
| if config.BufferMax == 0 { | ||
| config.BufferMax = 512 * 1024 | ||
| } | ||
|
|
||
| client := &Client{ | ||
| config: config, | ||
| logger: config.logger, | ||
| logger: config.Logger, | ||
|
|
||
| conn: conn, | ||
| eventsChan: make(chan *sendRequest, config.SendQueueSize), | ||
| pendingQueue: make(chan *sendRequest, config.PendingQueueSize), | ||
| buffer: buffer.NewBuffer(config.BufferMax), | ||
| closeCh: make(chan struct{}), | ||
| } | ||
| return client | ||
| go func() { | ||
| client.read() | ||
| }() | ||
| go func() { | ||
| client.write() | ||
| }() | ||
| return client, nil | ||
| } |