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TUN-8592: Use metadata from the edge to determine if request body is empty for QUIC transport

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If the metadata is missing, fallback to decide based on protocol, http
method, transferring and content length
This commit is contained in:
chungthuang
2024-08-09 14:43:35 -05:00
parent 318488e229
commit e2064c820f
2 changed files with 164 additions and 8 deletions
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53
connection/quic.go
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@@ -42,12 +42,26 @@ const (
HTTPMethodKey = "HttpMethod"
// HTTPHostKey is used to get or set http Method in QUIC ALPN if the underlying proxy connection type is HTTP.
HTTPHostKey = "HttpHost"
// HTTPRequestBodyHintKey is used in ConnectRequest metadata to indicate if the request has body
HTTPRequestBodyHintKey = "HttpReqBodyHint"
QUICMetadataFlowID = "FlowID"
// emperically this capacity has been working well
demuxChanCapacity = 16
)
type RequestBodyHint uint64
const (
RequestBodyHintMissing RequestBodyHint = iota
RequestBodyHintEmpty
RequestBodyHintHasData
)
func (rbh RequestBodyHint) String() string {
return [...]string{"missing", "empty", "data"}[rbh]
}
var (
portForConnIndex = make(map[uint8]int, 0)
portMapMutex sync.Mutex
@@ -486,7 +500,6 @@ func buildHTTPRequest(
dest := connectRequest.Dest
method := metadata[HTTPMethodKey]
host := metadata[HTTPHostKey]
isWebsocket := connectRequest.Type == pogs.ConnectionTypeWebsocket
req, err := http.NewRequestWithContext(ctx, method, dest, body)
if err != nil {
@@ -511,13 +524,8 @@ func buildHTTPRequest(
return nil, fmt.Errorf("Error setting content-length: %w", err)
}
// Go's client defaults to chunked encoding after a 200ms delay if the following cases are true:
// * the request body blocks
// * the content length is not set (or set to -1)
// * the method doesn't usually have a body (GET, HEAD, DELETE, ...)
// * there is no transfer-encoding=chunked already set.
// So, if transfer cannot be chunked and content length is 0, we dont set a request body.
if !isWebsocket && !isTransferEncodingChunked(req) && req.ContentLength == 0 {
if shouldSetRequestBodyToEmpty(connectRequest, metadata, req) {
log.Debug().Str("host", req.Host).Str("method", req.Method).Msg("Set request to have no body")
req.Body = http.NoBody
}
stripWebsocketUpgradeHeader(req)
@@ -542,6 +550,35 @@ func isTransferEncodingChunked(req *http.Request) bool {
return strings.Contains(strings.ToLower(transferEncodingVal), "chunked")
}
// Borrowed from https://github.com/golang/go/blob/go1.22.6/src/net/http/request.go#L1541
func requestMethodUsuallyLacksBody(req *http.Request) bool {
switch strings.ToUpper(req.Method) {
case "GET", "HEAD", "DELETE", "OPTIONS", "PROPFIND", "SEARCH":
return true
}
return false
}
func shouldSetRequestBodyToEmpty(connectRequest *pogs.ConnectRequest, metadata map[string]string, req *http.Request) bool {
switch metadata[HTTPRequestBodyHintKey] {
case RequestBodyHintEmpty.String():
return true
case RequestBodyHintHasData.String():
return false
default:
}
isWebsocket := connectRequest.Type == pogs.ConnectionTypeWebsocket
// Go's client defaults to chunked encoding after a 200ms delay if the following cases are true:
// * the request body blocks
// * the content length is not set (or set to -1)
// * the method doesn't usually have a body (GET, HEAD, DELETE, ...)
// * there is no transfer-encoding=chunked already set.
// So, if transfer cannot be chunked and content length is 0, we dont set a request body.
// Reference: https://github.com/golang/go/blob/go1.22.2/src/net/http/transfer.go#L192-L206
return !isWebsocket && requestMethodUsuallyLacksBody(req) && !isTransferEncodingChunked(req) && req.ContentLength == 0
}
// A helper struct that guarantees a call to close only affects read side, but not write side.
type nopCloserReadWriter struct {
io.ReadWriteCloser