Start keeping track of H2 state

bin/varnishd/http2/cache_http2.h

@@ -32,17 +32,20 @@ struct h2_sess;
 #include "hpack/vhp.h"
 
 enum h2_error_e {
+	H2E__DUMMY = -1,
 #define H2_ERROR(NAME, val, desc)		\
 	H2E_##NAME = val,
 #include "tbl/h2_error.h"
 };
 
 enum h2_frame_e {
+	H2_FRAME__DUMMY = -1,
 #define H2_FRAME(l,u,t,f) H2_FRAME_##u = t,
 #include "tbl/h2_frames.h"
 };
 
 enum h2_stream_e {
+	H2_STREAM__DUMMY = -1,
 #define H2_STREAM(U,s,d) H2_S_##U,
 #include "tbl/h2_stream.h"
 };
@@ -51,6 +54,7 @@ enum h2_stream_e {
 #include "tbl/h2_frames.h"
 
 enum h2setting {
+	H2_SETTINGS__DUMMY = -1,
 #define H2_SETTINGS(n,v,d) H2S_##n = v,
 #include "tbl/h2_settings.h"
 #undef H2_SETTINGS

bin/varnishd/http2/cache_http2_proto.c

@@ -188,6 +188,7 @@ h2_new_req(const struct worker *wrk, struct h2_sess *h2,
 	r2 = WS_Alloc(req->ws, sizeof *r2);
 	AN(r2);
 	INIT_OBJ(r2, H2_REQ_MAGIC);
+	r2->state = H2_S_IDLE;
 	r2->h2sess = h2;
 	r2->stream = stream;
 	r2->req = req;
@@ -384,6 +385,7 @@ h2_do_req(struct worker *wrk, void *priv)
 	assert(CNT_Request(wrk, req) != REQ_FSM_DISEMBARK);
 	VSL(SLT_Debug, 0, "H2REQ CNT done");
 	/* XXX clean up req */
+	r2->state = H2_S_CLOSED;
 	h2_del_req(wrk, r2, H2E_NO_ERROR);
 }
 
@@ -400,7 +402,9 @@ h2_rx_headers(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
 	 * read frames and proper error handling.
 	 */
 
-	assert(h2->rxf_stream & 1);
+	xxxassert(h2->rxf_stream & 1);
+	xxxassert(r2->state == H2_S_IDLE);
+	r2->state = H2_S_OPEN;
 
 	req = r2->req;
 	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);