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streams.go
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/
streams.go
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// SPDX-License-Identifier: AGPL-3.0-only
package main
import (
"bufio"
"errors"
"io"
"log"
"net/http"
"github.com/google/gopacket/tcpassembly/tcpreader"
)
type requestStream struct {
r *tcpreader.ReaderStream
p *parser
out chan *request
}
func newRequestStream(r *tcpreader.ReaderStream, p *parser) *requestStream {
rs := &requestStream{
r: r,
p: p,
out: make(chan *request, 1024),
}
go rs.parseRequests()
return rs
}
func (rs *requestStream) parseRequests() {
defer close(rs.out)
buf := bufio.NewReader(rs.r)
for {
req, err := http.ReadRequest(buf)
if errors.Is(err, io.EOF) {
// We must read until we see an EOF... very important!
return
}
var r *request
if err != nil {
r = &request{Error: err.Error()}
} else {
body, err := io.ReadAll(req.Body)
_ = req.Body.Close()
if err != nil {
r = &request{Error: err.Error()}
} else {
r = rs.p.processHTTPRequest(req, body)
}
}
select {
case rs.out <- r:
continue
default:
log.Println("dropping request")
}
}
}
type responseStream struct {
r *tcpreader.ReaderStream
p *parser
out chan *response
}
func newResponseStream(r *tcpreader.ReaderStream, p *parser) *responseStream {
rs := &responseStream{
r: r,
p: p,
out: make(chan *response, 1024),
}
go rs.parseResponses()
return rs
}
func (rs *responseStream) parseResponses() {
defer close(rs.out)
buf := bufio.NewReader(rs.r)
for {
req, err := http.ReadResponse(buf, nil)
if errors.Is(err, io.ErrUnexpectedEOF) {
return
}
var r *response
if err != nil {
r = &response{Error: err.Error()}
} else {
body, err := io.ReadAll(req.Body)
_ = req.Body.Close()
if err != nil {
r = &response{Error: err.Error()}
} else {
r = rs.p.processHTTPResponse(req, body)
}
}
select {
case rs.out <- r:
continue
default:
log.Println("dropping response")
}
}
}