108 lines
1.8 KiB
Go
108 lines
1.8 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"log"
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"net"
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"strconv"
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)
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type Client struct {
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conn net.Conn
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connected bool
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}
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func (c *Client) Connect(address string) error {
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var err error
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c.conn, err = net.Dial("tcp", address)
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if err != nil {
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return err
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}
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c.connected = true
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return c.doHandshake(protocolVersion1)
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}
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func (c *Client) Close() error {
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c.connected = false
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return c.conn.Close()
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}
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func (c *Client) SendBlob(blob []byte) error {
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if !c.connected {
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return fmt.Errorf("Not connected")
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}
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if len(blob) != BlobSize {
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return fmt.Errorf("Blob must be exactly " + strconv.Itoa(BlobSize) + " bytes")
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}
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blobHash := getBlobHash(blob)
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sendRequest, err := json.Marshal(sendBlobRequest{
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BlobSize: len(blob),
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BlobHash: blobHash,
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})
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if err != nil {
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return err
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}
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_, err = c.conn.Write(sendRequest)
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if err != nil {
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return err
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}
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dec := json.NewDecoder(c.conn)
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var sendResp sendBlobResponse
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err = dec.Decode(&sendResp)
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if err != nil {
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return err
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}
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if !sendResp.SendBlob {
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return ErrBlobExists
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}
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log.Println("Sending blob " + blobHash[:8])
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_, err = c.conn.Write(blob)
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if err != nil {
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return err
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}
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var transferResp blobTransferResponse
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err = dec.Decode(&transferResp)
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if err != nil {
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return err
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}
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if !transferResp.ReceivedBlob {
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return fmt.Errorf("Server did not received blob")
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}
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return nil
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}
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func (c *Client) doHandshake(version int) error {
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if !c.connected {
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return fmt.Errorf("Not connected")
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}
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handshake, err := json.Marshal(handshakeRequestResponse{Version: version})
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if err != nil {
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return err
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}
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_, err = c.conn.Write(handshake)
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if err != nil {
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return err
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}
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var resp handshakeRequestResponse
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dec := json.NewDecoder(c.conn)
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err = dec.Decode(&resp)
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if err != nil {
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return err
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} else if resp.Version != version {
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return fmt.Errorf("Handshake version mismatch")
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}
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return nil
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}
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