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package spartan
import (
"bytes"
"errors"
"io"
"net"
"strconv"
sr "tildegit.org/tjp/sliderule"
)
// Client is used for sending spartan requests and receiving responses.
//
// It carries no state and is reusable simultaneously by multiple goroutines.
//
// The zero value is immediately usabble.
type Client struct{}
// RoundTrip sends a single spartan request and returns its response.
func (c Client) RoundTrip(request *sr.Request) (*sr.Response, error) {
if request.Scheme != "spartan" && request.Scheme != "" {
return nil, errors.New("non-spartan protocols not supported")
}
host, port, _ := net.SplitHostPort(request.Host)
if port == "" {
host = request.Host
port = "300"
}
addr := net.JoinHostPort(host, port)
conn, err := net.Dial("tcp", addr)
if err != nil {
return nil, err
}
defer conn.Close()
request.RemoteAddr = conn.RemoteAddr()
rdr, ok := request.Meta.(*io.LimitedReader)
if !ok {
return nil, errors.New("request body must be an *io.LimitedReader")
}
requestLine := host + " " + request.EscapedPath() + " " + strconv.Itoa(int(rdr.N)) + "\r\n"
if _, err := conn.Write([]byte(requestLine)); err != nil {
return nil, err
}
if _, err := io.Copy(conn, rdr); err != nil {
return nil, err
}
response, err := ParseResponse(conn)
if err != nil {
return nil, err
}
bodybuf, err := io.ReadAll(response.Body)
if err != nil {
return nil, err
}
response.Body = bytes.NewBuffer(bodybuf)
return response, nil
}
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