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Overview
| Comment: | Optimizations to the ETag implementation. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | etags-cache-control |
| Files: | files | file ages | folders |
| SHA3-256: | 2588d447839e1b44ef1408e0fd556a8b |
| User & Date: | drh 2018-02-24 03:47:49 |
Context
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2018-02-24
| ||
| 20:14 | Redesign the ETags mechanism to be simpler and safer. check-in: ae660cd6 user: drh tags: etags-cache-control | |
| 03:49 | Add support for the ETag: and If-None-Match: headers for improved cache control. Currently this only works for /uv but the mechanism is reasonably general and can be extended to other pages. check-in: 787896c5 user: drh tags: etags | |
| 03:47 | Optimizations to the ETag implementation. check-in: 2588d447 user: drh tags: etags-cache-control | |
| 03:38 | ETags now working for the /uv page. check-in: 5b84cab0 user: drh tags: etags-cache-control | |
Changes
Changes to src/etag.c.
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**
** After each call to these routines, the HTTP_IF_NONE_MATCH cookie
** is checked, and if it contains a compatible ETag, then a
** 304 Not Modified return is generated and execution aborts. This
** routine does not return if the 304 is generated.
*/
void etag_require(int code){
mEtag |= code;
etag_check();
}
void etag_require_hash(const char *zHash){
if( zHash ){
zEHash = zHash;
mEtag = ETAG_HASH;
................................................................................
** fossil binary is sufficient to invalidate all prior caches.
**
** The other elements are only present if the appropriate mask bits
** appear in the first character.
*/
char *etag_generate(int m){
Blob x = BLOB_INITIALIZER;
int mtime;
if( m<0 ) m = mEtag;
if( m & ETAG_DYNAMIC ) return 0;
mtime = file_mtime(g.nameOfExe, ExtFILE);
blob_appendf(&x,"%d%x", m, mtime);
if( m & ETAG_HASH ){
blob_appendf(&x, "/%s", zEHash);
}else if( m & ETAG_DATA ){
int iKey = db_int(0, "SELECT max(rcvid) FROM rcvfrom");
blob_appendf(&x, "/%x", iKey);
}else if( m & ETAG_CONFIG ){
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**
** After each call to these routines, the HTTP_IF_NONE_MATCH cookie
** is checked, and if it contains a compatible ETag, then a
** 304 Not Modified return is generated and execution aborts. This
** routine does not return if the 304 is generated.
*/
void etag_require(int code){
if( (mEtag & code)==code ) return;
mEtag |= code;
etag_check();
}
void etag_require_hash(const char *zHash){
if( zHash ){
zEHash = zHash;
mEtag = ETAG_HASH;
................................................................................
** fossil binary is sufficient to invalidate all prior caches.
**
** The other elements are only present if the appropriate mask bits
** appear in the first character.
*/
char *etag_generate(int m){
Blob x = BLOB_INITIALIZER;
static int mtime = 0;
if( m<0 ) m = mEtag;
if( m & ETAG_DYNAMIC ) return 0;
if( mtime==0 ) mtime = file_mtime(g.nameOfExe, ExtFILE);
blob_appendf(&x,"%d%x", m, mtime);
if( m & ETAG_HASH ){
blob_appendf(&x, "/%s", zEHash);
}else if( m & ETAG_DATA ){
int iKey = db_int(0, "SELECT max(rcvid) FROM rcvfrom");
blob_appendf(&x, "/%x", iKey);
}else if( m & ETAG_CONFIG ){
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