reflector.go/reflector/client.go

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package reflector
import (
"encoding/json"
"net"
"strconv"
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"github.com/lbryio/lbry.go/errors"
log "github.com/sirupsen/logrus"
)
// ErrBlobExists is a default error for when a blob already exists on the reflector server.
var ErrBlobExists = errors.Base("blob exists on server")
// Client is an instance of a client connected to a server.
type Client struct {
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conn net.Conn
connected bool
}
// Connect connects to a specific clients and errors if it cannot be contacted.
func (c *Client) Connect(address string) error {
var err error
c.conn, err = net.Dial(network, address)
if err != nil {
return err
}
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c.connected = true
return c.doHandshake(protocolVersion1)
}
// Close closes the connection with the client.
func (c *Client) Close() error {
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c.connected = false
return c.conn.Close()
}
// SendBlob sends a send blob request to the client.
func (c *Client) SendBlob(blob []byte) error {
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if !c.connected {
return errors.Err("not connected")
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}
if len(blob) > maxBlobSize {
return errors.Err("blob must be at most " + strconv.Itoa(maxBlobSize) + " bytes")
} else if len(blob) == 0 {
return errors.Err("blob is empty")
}
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blobHash := BlobHash(blob)
sendRequest, err := json.Marshal(sendBlobRequest{
BlobSize: len(blob),
BlobHash: blobHash,
})
if err != nil {
return err
}
_, err = c.conn.Write(sendRequest)
if err != nil {
return err
}
dec := json.NewDecoder(c.conn)
var sendResp sendBlobResponse
err = dec.Decode(&sendResp)
if err != nil {
return err
}
if !sendResp.SendBlob {
return ErrBlobExists
}
log.Println("Sending blob " + blobHash[:8])
_, err = c.conn.Write(blob)
if err != nil {
return err
}
var transferResp blobTransferResponse
err = dec.Decode(&transferResp)
if err != nil {
return err
}
if !transferResp.ReceivedBlob {
return errors.Err("server did not received blob")
}
return nil
}
func (c *Client) doHandshake(version int) error {
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if !c.connected {
return errors.Err("not connected")
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}
handshake, err := json.Marshal(handshakeRequestResponse{Version: version})
if err != nil {
return err
}
_, err = c.conn.Write(handshake)
if err != nil {
return err
}
var resp handshakeRequestResponse
err = json.NewDecoder(c.conn).Decode(&resp)
if err != nil {
return err
} else if resp.Version != version {
return errors.Err("handshake version mismatch")
}
return nil
}