[master] bab1226 Use RFC5861::stale-while-revalidate to initialize beresp.grace
Poul-Henning Kamp
phk at FreeBSD.org
Tue Oct 7 11:03:59 CEST 2014
commit bab12263b1561c3d45e5bc6a0ab9b66e8b0ed115
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date: Tue Oct 7 09:03:28 2014 +0000
Use RFC5861::stale-while-revalidate to initialize beresp.grace
Submitted by: fgs
diff --git a/bin/varnishd/cache/cache.h b/bin/varnishd/cache/cache.h
index 056f61e..254c22e 100644
--- a/bin/varnishd/cache/cache.h
+++ b/bin/varnishd/cache/cache.h
@@ -1158,6 +1158,7 @@ unsigned RFC2616_Req_Gzip(const struct http *);
int RFC2616_Do_Cond(const struct req *sp);
void RFC2616_Weaken_Etag(struct http *hp);
void RFC2616_Vary_AE(struct http *hp);
+void RFC5861_Stale(const struct busyobj *);
/* stevedore.c */
int STV_NewObject(struct objcore *, struct worker *,
diff --git a/bin/varnishd/cache/cache_fetch.c b/bin/varnishd/cache/cache_fetch.c
index 674845d..2f9ab92 100644
--- a/bin/varnishd/cache/cache_fetch.c
+++ b/bin/varnishd/cache/cache_fetch.c
@@ -365,6 +365,8 @@ vbf_stp_startfetch(struct worker *wrk, struct busyobj *bo)
EXP_Clr(&bo->fetch_objcore->exp);
RFC2616_Ttl(bo, now);
+ RFC5861_Stale(bo);
+
/* private objects have negative TTL */
if (bo->fetch_objcore->flags & OC_F_PRIVATE)
bo->fetch_objcore->exp.ttl = -1.;
diff --git a/bin/varnishd/cache/cache_rfc2616.c b/bin/varnishd/cache/cache_rfc2616.c
index 20b366b..4733b56 100644
--- a/bin/varnishd/cache/cache_rfc2616.c
+++ b/bin/varnishd/cache/cache_rfc2616.c
@@ -275,3 +275,35 @@ RFC2616_Vary_AE(struct http *hp)
http_SetHeader(hp, "Vary: Accept-Encoding");
}
}
+
+/*
+ * RFC5861 outlines a way to control the use of stale responses.
+ * We use this to initialize the grace period.
+ */
+
+void
+RFC5861_Stale(const struct busyobj *bo)
+{
+ const char *p;
+ const struct http *hp;
+ struct exp *expp;
+
+ expp = &bo->fetch_objcore->exp;
+
+ /*
+ * If we are not meant to cache this ignore any potential
+ * stale-while-revalidate values.
+ */
+ if (expp->ttl < 0.)
+ return;
+
+ hp = bo->beresp;
+
+ if (http_GetHdrField(hp, H_Cache_Control,
+ "stale-while-revalidate", &p) && p != NULL) {
+ if (*p == '-')
+ expp->grace = 0;
+ else
+ expp->grace = strtoul(p, NULL, 0);
+ }
+}
diff --git a/bin/varnishtest/tests/b00043.vtc b/bin/varnishtest/tests/b00043.vtc
new file mode 100644
index 0000000..1591a03
--- /dev/null
+++ b/bin/varnishtest/tests/b00043.vtc
@@ -0,0 +1,41 @@
+varnishtest "Test stale-while-revalidate"
+
+server s1 {
+ rxreq
+ txresp -hdr "Cache-Control: max-age=30, stale-while-revalidate=30"
+ rxreq
+ txresp -hdr "Cache-Control: max-age=0, stale-while-revalidate=30"
+ rxreq
+ txresp -hdr "Cache-Control: max-age=30, stale-while-revalidate=30" -hdr "Age: 40"
+ rxreq
+ txresp -status 500 -hdr "Cache-Control: max-age=30, stale-while-revalidate=30"
+} -start
+
+varnish v1 -vcl+backend {
+ sub vcl_backend_response {
+ set beresp.http.grace = beresp.grace;
+ set beresp.http.ttl = beresp.ttl;
+ }
+} -start
+
+client c1 {
+ txreq -url /1
+ rxresp
+ expect resp.http.grace == 30.000
+ expect resp.http.ttl == 30.000
+
+ txreq -url /2
+ rxresp
+ expect resp.http.grace == 30.000
+ expect resp.http.ttl == 0.000
+
+ txreq -url /3
+ rxresp
+ expect resp.http.grace == 30.000
+ expect resp.http.ttl == -10.000
+
+ txreq -url /4
+ rxresp
+ expect resp.http.grace == 10.000
+ expect resp.http.ttl == 0.000
+} -run
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