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r9277@Kushana: nickm | 2006-10-19 19:03:05 -0400
Add pragma:no-cache and expires headers so that directory lookups can work better in the presence of caching HTTP proxies. (I would have used Cache-Control, but that is an HTTP/1.1 thing.) All timeouts are currently wild-assed guesses. svn:r8765
This commit is contained in:
Nick Mathewson
parent
f47c49228d
commit
974bdee183
@ -8,6 +8,9 @@ Changes in version 0.1.2.3-alpha - 2006-10-??
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recommended by no authorities, or until we get a better one for the
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same router. Make caches consider retaining old recommended
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routers for even longer.
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- Directory servers now provide 'Pragma: no-cache' and 'Expires'
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headers for content, so that we can work better in the presence of
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caching HTTP proxies.
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o Minor features, controller:
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- Add a REASON field to CIRC events; for backward compatibility, this
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18
doc/TODO
18
doc/TODO
@ -159,16 +159,16 @@ N - split "router is down" from "dirport shouldn't be tried for a while"?
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when they feel like it.
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- update dir-spec with what we decided for each of these
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N - provide no-cache no-index headers from the dirport?
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- Specify
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- cacheing
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- Single network-statuses, single descriptors, "all", "authority",
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o provide no-cache no-index headers from the dirport?
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o Specify
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o cacheing
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o Single network-statuses, single descriptors, "all", "authority",
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and v1 directory stuff are all cacheable for a short time.
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- Multiple network-statuses or descriptors are not cacheable.
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- Be sure to be correct wrt HTTP/1.0
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- indexing
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- robots.txt
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- Implement
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o Multiple network-statuses or descriptors are not cacheable.
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o Be sure to be correct wrt HTTP/1.0
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o indexing
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o robots.txt (oh, it was already there.)
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o Implement
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- Windows server usability
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- Solve the ENOBUFS problem.
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@ -565,7 +565,6 @@ $Id$
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For debugging, directories SHOULD expose non-compressed objects at URLs like
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the above, but without the final ".z".
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Clients MUST handle compressed concatenated information in two forms:
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- A concatenated list of zlib-compressed objects.
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- A zlib-compressed concatenated list of objects.
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@ -801,7 +800,24 @@ $Id$
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...
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7.0 Error and return codes in the directory protocol
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7. Standards compliance
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We should write down what return codes dirservers send in what situations.
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All clients and servers MUST support HTTP 1.0.
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7.1. HTTP headers
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Servers MAY set the Content-Length header. Servers SHOULD set
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Content-Encoding to "deflate" or "identity".
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Servers MAY include an X-Your-Address-Is: header, whose value is the
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apparent IP address of the client connecting to them (as a dotted quad).
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Servers SHOULD disable caching of multiple network statuses or multiple
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router descriptors. Servers MAY enable caching of single descriptors,
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single network statuses, the list of all router descriptors, a v1
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directory, or a v1 running routers document. XXX mention times.
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7.2. HTTP status codes
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XXX We should write down what return codes dirservers send in what situations.
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@ -61,6 +61,13 @@ static void note_request(const char *key, size_t bytes);
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#define X_ADDRESS_HEADER "X-Your-Address-Is: "
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/* HTTP cache control: how long do we tell proxies they can cache things? */
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#define FULL_DIR_CACHE_LIFETIME (60*60)
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#define RUNNINGROUTERS_CACHE_LIFETIME (20*60)
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#define NETWORKSTATUS_CACHE_LIFETIME (5*60)
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#define ROUTERDESC_CACHE_LIFETIME (30*60)
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#define ROBOTS_CACHE_LIFETIME (24*60*60)
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/********* END VARIABLES ************/
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/** Return true iff the directory purpose 'purpose' must use an
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@ -1297,19 +1304,27 @@ write_http_status_line(dir_connection_t *conn, int status,
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connection_write_to_buf(buf, strlen(buf), TO_CONN(conn));
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}
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/** DOCDOC */
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/** Write the header for an HTTP/1.0 response onto <b>conn</b>->outbuf,
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* with <b>type</b> as the Content-Type.
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*
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* If <b>length</b> is nonnegative, it is the Content-Length.
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* If <b>encoding</b> is provided, it is the Content-Encoding.
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* If <b>cache_lifetime</b> is greater than 0, the content may be cached for
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* up to cache_lifetime seconds. Otherwise, the content may not be cached. */
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static void
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write_http_response_header(dir_connection_t *conn, ssize_t length,
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const char *type, const char *encoding)
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const char *type, const char *encoding,
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int cache_lifetime)
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{
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char date[RFC1123_TIME_LEN+1];
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char tmp[1024];
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char *cp;
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time_t now = time(NULL);
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tor_assert(conn);
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tor_assert(type);
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format_rfc1123_time(date, time(NULL));
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format_rfc1123_time(date, now);
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cp = tmp;
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tor_snprintf(cp, sizeof(tmp),
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"HTTP/1.0 200 OK\r\nDate: %s\r\nContent-Type: %s\r\n"
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@ -1326,6 +1341,20 @@ write_http_response_header(dir_connection_t *conn, ssize_t length,
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"Content-Length: %ld\r\n", (long)length);
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cp += strlen(cp);
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}
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if (cache_lifetime > 0) {
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char expbuf[RFC1123_TIME_LEN+1];
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format_rfc1123_time(expbuf, now + cache_lifetime);
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/* We could say 'Cache-control: max-age=%d' here if we start doing
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* http/1.1 */
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tor_snprintf(cp, sizeof(tmp)-(cp-tmp),
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"Expires: %s\r\n", expbuf);
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cp += strlen(cp);
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} else {
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/* We could say 'Cache-control: no-cache' here if we start doing
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* http/1.1 */
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strlcpy(cp, "Pragma: no-cache\r\n", sizeof(tmp)-(cp-tmp));
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cp += strlen(cp);
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}
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if (sizeof(tmp)-(cp-tmp) > 3)
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memcpy(cp, "\r\n", 3);
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else
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@ -1484,7 +1513,8 @@ directory_handle_command_get(dir_connection_t *conn, char *headers,
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deflated?"deflated ":"");
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write_http_response_header(conn, dlen,
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deflated?"application/octet-stream":"text/plain",
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deflated?"deflate":"identity");
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deflated?"deflate":"identity",
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FULL_DIR_CACHE_LIFETIME);
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conn->cached_dir = d;
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conn->cached_dir_offset = 0;
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if (! deflated)
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@ -1513,7 +1543,8 @@ directory_handle_command_get(dir_connection_t *conn, char *headers,
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write_http_response_header(conn, dlen,
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deflated?"application/octet-stream":"text/plain",
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deflated?"deflate":"identity");
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deflated?"deflate":"identity",
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RUNNINGROUTERS_CACHE_LIFETIME);
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connection_write_to_buf(cp, strlen(cp), TO_CONN(conn));
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return 0;
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}
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@ -1546,8 +1577,8 @@ directory_handle_command_get(dir_connection_t *conn, char *headers,
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// note_request(request_type,dlen);
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write_http_response_header(conn, -1,
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deflated?"application/octet_stream":"text/plain",
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deflated?"deflate":NULL);
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deflated?"deflate":NULL,
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smartlist_len(dir_fps) == 1 ? NETWORKSTATUS_CACHE_LIFETIME:0);
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conn->fingerprint_stack = dir_fps;
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if (! deflated)
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conn->zlib_state = tor_zlib_new(0, ZLIB_METHOD);
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@ -1565,23 +1596,31 @@ directory_handle_command_get(dir_connection_t *conn, char *headers,
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int res;
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const char *msg;
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const char *request_type = NULL;
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int cache_lifetime = 0;
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if (deflated)
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url[url_len-2] = '\0';
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conn->fingerprint_stack = smartlist_create();
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res = dirserv_get_routerdesc_fingerprints(conn->fingerprint_stack, url,
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&msg);
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if (!strcmpstart(url, "/tor/server/fp/"))
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if (!strcmpstart(url, "/tor/server/fp/")) {
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request_type = deflated?"/tor/server/fp.z":"/tor/server/fp";
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else if (!strcmpstart(url, "/tor/server/authority"))
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if (smartlist_len(conn->fingerprint_stack) == 1)
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cache_lifetime = ROUTERDESC_CACHE_LIFETIME;
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} else if (!strcmpstart(url, "/tor/server/authority")) {
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request_type = deflated?"/tor/server/authority.z":
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"/tor/server/authority";
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else if (!strcmpstart(url, "/tor/server/all"))
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cache_lifetime = ROUTERDESC_CACHE_LIFETIME;
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} else if (!strcmpstart(url, "/tor/server/all")) {
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request_type = deflated?"/tor/server/all.z":"/tor/server/all";
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else if (!strcmpstart(url, "/tor/server/d/"))
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cache_lifetime = FULL_DIR_CACHE_LIFETIME;
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} else if (!strcmpstart(url, "/tor/server/d/")) {
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request_type = deflated?"/tor/server/d.z":"/tor/server/d";
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else
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if (smartlist_len(conn->fingerprint_stack) == 1)
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cache_lifetime = ROUTERDESC_CACHE_LIFETIME;
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} else {
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request_type = "/tor/server/?";
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}
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if (!strcmpstart(url, "/tor/server/d/"))
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conn->dir_spool_src = DIR_SPOOL_SERVER_BY_DIGEST;
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else
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@ -1592,7 +1631,7 @@ directory_handle_command_get(dir_connection_t *conn, char *headers,
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else {
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write_http_response_header(conn, -1,
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deflated?"application/octet_stream":"text/plain",
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deflated?"deflate":NULL);
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deflated?"deflate":NULL, cache_lifetime);
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if (deflated)
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conn->zlib_state = tor_zlib_new(1, ZLIB_METHOD);
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/* Prime the connection with some data. */
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@ -1613,7 +1652,7 @@ directory_handle_command_get(dir_connection_t *conn, char *headers,
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switch (rend_cache_lookup_desc(query, versioned?-1:0, &descp, &desc_len)) {
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case 1: /* valid */
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write_http_response_header(conn, desc_len, "application/octet-stream",
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NULL);
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NULL, 0);
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note_request("/tor/rendezvous?/", desc_len);
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/* need to send descp separately, because it may include nuls */
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connection_write_to_buf(descp, desc_len, TO_CONN(conn));
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@ -1632,7 +1671,7 @@ directory_handle_command_get(dir_connection_t *conn, char *headers,
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if (!strcmpstart(url,"/tor/bytes.txt")) {
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char *bytes = directory_dump_request_log();
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size_t len = strlen(bytes);
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write_http_response_header(conn, len, "text/plain", NULL);
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write_http_response_header(conn, len, "text/plain", NULL, 0);
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connection_write_to_buf(bytes, len, TO_CONN(conn));
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tor_free(bytes);
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tor_free(url);
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@ -1643,7 +1682,8 @@ directory_handle_command_get(dir_connection_t *conn, char *headers,
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rewritten to /tor/robots.txt */
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char robots[] = "User-agent: *\r\nDisallow: /\r\n";
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size_t len = strlen(robots);
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write_http_response_header(conn, len, "text/plain", NULL);
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write_http_response_header(conn, len, "text/plain", NULL,
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ROBOTS_CACHE_LIFETIME);
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connection_write_to_buf(robots, len, TO_CONN(conn));
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tor_free(url);
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return 0;
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@ -1665,7 +1705,7 @@ directory_handle_command_get(dir_connection_t *conn, char *headers,
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dlen = strlen(new_directory);
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write_http_response_header(conn, dlen, "text/plain", "identity");
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write_http_response_header(conn, dlen, "text/plain", "identity", 0);
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connection_write_to_buf(new_directory, dlen, TO_CONN(conn));
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tor_free(new_directory);
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