/* fetch headers from disk, pass on to SwapInCBlock */
static void
peerDigestSwapInHeaders(void *data, mem_node_ref nr, ssize_t size)
{
DigestFetchState *fetch = data;
assert(size <= nr.node->len - nr.offset);
if (peerDigestFetchedEnough(fetch, size, "peerDigestSwapInHeaders"))
goto finish;
assert(!fetch->offset);
assert(fetch->entry->mem_obj->reply);
if (fetch->entry->mem_obj->reply->sline.status != HTTP_OK) {
debug(72, 1) ("peerDigestSwapInHeaders: %s status %d got cached!\n",
strBuf(fetch->pd->host), fetch->entry->mem_obj->reply->sline.status);
peerDigestFetchAbort(fetch, "internal status error");
goto finish;
}
fetch->offset = fetch->entry->mem_obj->reply->hdr_sz;
fetch->buf = memAllocate(MEM_4K_BUF);
storeClientRef(fetch->sc, fetch->entry, fetch->offset, fetch->offset,
SM_PAGE_SIZE, peerDigestSwapInCBlock, fetch);
finish:
stmemNodeUnref(&nr);
}
/* wait for full http headers to be received then parse them */
static void
peerDigestFetchReply(void *data, char *buf, ssize_t size)
{
DigestFetchState *fetch = data;
PeerDigest *pd = fetch->pd;
size_t hdr_size;
assert(pd && buf);
assert(!fetch->offset);
if (peerDigestFetchedEnough(fetch, buf, size, "peerDigestFetchReply"))
return;
if ((hdr_size = headersEnd(buf, size))) {
http_status status;
HttpReply *reply = fetch->entry->mem_obj->reply;
assert(reply);
httpReplyParse(reply, buf, hdr_size);
status = reply->sline.status;
debug(72, 3) ("peerDigestFetchReply: %s status: %d, expires: %d (%+d)\n",
strBuf(pd->host), status,
reply->expires, reply->expires - squid_curtime);
/* this "if" is based on clientHandleIMSReply() */
if (status == HTTP_NOT_MODIFIED) {
request_t *r = NULL;
/* our old entry is fine */
assert(fetch->old_entry);
if (!fetch->old_entry->mem_obj->request)
fetch->old_entry->mem_obj->request = r =
requestLink(fetch->entry->mem_obj->request);
assert(fetch->old_entry->mem_obj->request);
httpReplyUpdateOnNotModified(fetch->old_entry->mem_obj->reply, reply);
storeTimestampsSet(fetch->old_entry);
/* get rid of 304 reply */
storeUnregister(fetch->entry, fetch);
storeUnlockObject(fetch->entry);
fetch->entry = fetch->old_entry;
fetch->old_entry = NULL;
/* preserve request -- we need its size to update counters */
/* requestUnlink(r); */
/* fetch->entry->mem_obj->request = NULL; */
} else if (status == HTTP_OK) {
/* get rid of old entry if any */
if (fetch->old_entry) {
debug(72, 3) ("peerDigestFetchReply: got new digest, releasing old one\n");
storeUnregister(fetch->old_entry, fetch);
storeReleaseRequest(fetch->old_entry);
storeUnlockObject(fetch->old_entry);
fetch->old_entry = NULL;
}
} else {
/* some kind of a bug */
peerDigestFetchAbort(fetch, buf, httpStatusLineReason(&reply->sline));
return;
}
/* must have a ready-to-use store entry if we got here */
/* can we stay with the old in-memory digest? */
if (status == HTTP_NOT_MODIFIED && fetch->pd->cd)
peerDigestFetchStop(fetch, buf, "Not modified");
else
storeClientCopy(fetch->entry, /* have to swap in */
0, 0, SM_PAGE_SIZE, buf, peerDigestSwapInHeaders, fetch);
} else {
/* need more data, do we have space? */
if (size >= SM_PAGE_SIZE)
peerDigestFetchAbort(fetch, buf, "reply header too big");
else
storeClientCopy(fetch->entry, size, 0, SM_PAGE_SIZE, buf,
peerDigestFetchReply, fetch);
}
}
/* wait for full http headers to be received */
static void
peerDigestFetchReply(void *data, mem_node_ref nr, ssize_t size)
{
const char *buf = nr.node->data + nr.offset;
DigestFetchState *fetch = data;
PeerDigest *pd = fetch->pd;
http_status status;
HttpReply *reply;
assert(pd && buf);
assert(!fetch->offset);
assert(size <= nr.node->len - nr.offset);
if (peerDigestFetchedEnough(fetch, size, "peerDigestFetchReply"))
goto finish;
reply = fetch->entry->mem_obj->reply;
assert(reply);
status = reply->sline.status;
debug(72, 3) ("peerDigestFetchReply: %s status: %d, expires: %ld (%+d)\n",
strBuf(pd->host), status,
(long int) reply->expires, (int) (reply->expires - squid_curtime));
/* this "if" is based on clientHandleIMSReply() */
if (status == HTTP_NOT_MODIFIED) {
request_t *r = NULL;
/* our old entry is fine */
assert(fetch->old_entry);
if (!fetch->old_entry->mem_obj->request)
fetch->old_entry->mem_obj->request = r =
requestLink(fetch->entry->mem_obj->request);
assert(fetch->old_entry->mem_obj->request);
httpReplyUpdateOnNotModified(fetch->old_entry->mem_obj->reply, reply);
storeTimestampsSet(fetch->old_entry);
/* get rid of 304 reply */
storeClientUnregister(fetch->sc, fetch->entry, fetch);
storeUnlockObject(fetch->entry);
/* And prepare to swap in old entry if needed */
fetch->entry = fetch->old_entry;
fetch->old_entry = NULL;
fetch->sc = fetch->old_sc;
fetch->old_sc = NULL;
/* preserve request -- we need its size to update counters */
/* requestUnlink(r); */
/* fetch->entry->mem_obj->request = NULL; */
} else if (status == HTTP_OK) {
/* get rid of old entry if any */
if (fetch->old_entry) {
debug(72, 3) ("peerDigestFetchReply: got new digest, releasing old one\n");
storeClientUnregister(fetch->old_sc, fetch->old_entry, fetch);
storeReleaseRequest(fetch->old_entry);
storeUnlockObject(fetch->old_entry);
fetch->old_entry = NULL;
}
} else {
/* some kind of a bug */
peerDigestFetchAbort(fetch, httpStatusLineReason(&reply->sline));
goto finish;
}
/* must have a ready-to-use store entry if we got here */
/* can we stay with the old in-memory digest? */
if (status == HTTP_NOT_MODIFIED && fetch->pd->cd)
peerDigestFetchStop(fetch, "Not modified");
else
storeClientRef(fetch->sc, fetch->entry, /* have to swap in */
0, 0, SM_PAGE_SIZE, peerDigestSwapInHeaders, fetch);
finish:
stmemNodeUnref(&nr);
}