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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 |
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@@ -1,20 +1,183 @@ | ||
package opcua | ||
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import "log/slog" | ||
import ( | ||
"crypto/tls" | ||
"fmt" | ||
"github.com/shoothzj/gox/buffer" | ||
"github.com/shoothzj/gox/netx" | ||
"log/slog" | ||
"net" | ||
"sync" | ||
) | ||
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type ClientConfig struct { | ||
logger *slog.Logger | ||
Address netx.Address | ||
BufferMax int | ||
SendQueueSize int | ||
PendingQueueSize int | ||
TlsConfig *tls.Config | ||
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Logger *slog.Logger | ||
} | ||
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type sendRequest struct { | ||
bytes []byte | ||
callback func([]byte, error) | ||
} | ||
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type Client struct { | ||
config *ClientConfig | ||
logger *slog.Logger | ||
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conn net.Conn | ||
eventsChan chan *sendRequest | ||
pendingQueue chan *sendRequest | ||
buffer *buffer.Buffer | ||
closeCh chan struct{} | ||
} | ||
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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 | ||
} | ||
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func (c *Client) sendAsync(bytes []byte, callback func([]byte, error)) { | ||
sr := &sendRequest{ | ||
bytes: bytes, | ||
callback: callback, | ||
} | ||
c.eventsChan <- sr | ||
} | ||
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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 | ||
} | ||
} | ||
} | ||
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func NewClient(config *ClientConfig) *Client { | ||
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 | ||
} | ||
} | ||
} | ||
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func (c *Client) Close() { | ||
_ = c.conn.Close() | ||
c.closeCh <- struct{}{} | ||
} | ||
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func NewClient(config *ClientConfig) (*Client, error) { | ||
var conn net.Conn | ||
var err error | ||
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if config.TlsConfig == nil { | ||
conn, err = net.Dial("tcp", config.Address.Addr()) | ||
} else { | ||
conn, err = tls.Dial("tcp", config.Address.Addr(), config.TlsConfig) | ||
} | ||
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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 | ||
} | ||
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client := &Client{ | ||
config: config, | ||
logger: config.logger, | ||
logger: config.Logger, | ||
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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 | ||
} |