Revive http keep alive to save tcp connection setup costs

1 files changed, 12 insertions, 5 deletions

diff --git a/opentracker.c b/opentracker.c
index 21eeb42..11da486 100644
--- a/opentracker.c
+++ b/opentracker.c
@@ -177,12 +177,13 @@ static void handle_read(const int64_t sock, struct ot_workstruct *ws) {
 }
 
 static void handle_write(const int64_t sock) {
-  struct http_data *cookie = fdstate_cookie(sock);
-  int               chunked = 0;
+  struct http_data *cookie     = fdstate_cookie(sock);
+  int               chunked    = 0;
+  int               keep_alive = 0;
 
   if (cookie) {
-    if (cookie->flag & STRUCT_HTTP_FLAG_CHUNKED_IN_TRANSFER)
-      chunked = 1;
+    chunked    = (cookie->flag & STRUCT_HTTP_FLAG_CHUNKED_IN_TRANSFER) != 0;
+    keep_alive = (cookie->flag & STRUCT_HTTP_FLAG_KEEPALIVE) != 0;
 
     if (cookie->batch) {
       if (batch_send(sock, cookie->batch) == BATCH_FAILED) {
@@ -197,7 +198,13 @@ static void handle_write(const int64_t sock) {
   /* In a chunked transfer, wait for the next piece once everything queued has gone out */
   if (chunked)
     http_interest_drop(sock, cookie, EVENT_OUT);
-  else
+  else if (keep_alive) {
+    /* The reply is out and the client asked to keep the connection, so stop
+       waiting to write and go back to waiting for the next request */
+    http_interest_drop(sock, cookie, EVENT_OUT);
+    http_interest_add(sock, cookie, EVENT_IN);
+    fdstate_set_expiry(sock, g_now_seconds + OT_CLIENT_TIMEOUT);
+  } else
     handle_dead(sock);
 }