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/* |
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** Copyright (c) 2014 D. Richard Hipp |
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** |
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** This program is free software; you can redistribute it and/or |
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** modify it under the terms of the Simplified BSD License (also |
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** known as the "2-Clause License" or "FreeBSD License".) |
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** |
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** This program is distributed in the hope that it will be useful, |
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** but without any warranty; without even the implied warranty of |
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** merchantability or fitness for a particular purpose. |
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** |
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** Author contact information: |
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** [email protected] |
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** |
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******************************************************************************* |
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** |
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** This file implements a cache for expense operations such as |
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** /zip and /tarball. |
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*/ |
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#include "config.h" |
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#include <sqlite3.h> |
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#include "cache.h" |
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/* |
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** Construct the name of the repository cache file |
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*/ |
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static char *cacheName(void){ |
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int i; |
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int n; |
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if( g.zRepositoryName==0 ) return 0; |
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n = (int)strlen(g.zRepositoryName); |
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for(i=n-1; i>=0; i--){ |
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if( g.zRepositoryName[i]=='/' ){ i = n; break; } |
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if( g.zRepositoryName[i]=='.' ) break; |
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} |
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if( i<0 ) i = n; |
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return mprintf("%.*s.cache", i, g.zRepositoryName); |
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} |
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/* |
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** Attempt to open the cache database, if such a database exists. |
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** Make sure the cache table exists within that database. |
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*/ |
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static sqlite3 *cacheOpen(int bForce){ |
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char *zDbName; |
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sqlite3 *db = 0; |
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int rc; |
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i64 sz; |
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zDbName = cacheName(); |
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if( zDbName==0 ) return 0; |
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if( bForce==0 ){ |
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sz = file_size(zDbName, ExtFILE); |
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if( sz<=0 ){ |
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fossil_free(zDbName); |
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return 0; |
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} |
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} |
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rc = sqlite3_open(zDbName, &db); |
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fossil_free(zDbName); |
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if( rc ){ |
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sqlite3_close(db); |
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return 0; |
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} |
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sqlite3_busy_timeout(db, 5000); |
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if( sqlite3_table_column_metadata(db,0,"blob","key",0,0,0,0,0)!=SQLITE_OK ){ |
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rc = sqlite3_exec(db, |
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"PRAGMA page_size=8192;" |
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"CREATE TABLE IF NOT EXISTS blob(id INTEGER PRIMARY KEY, data BLOB);" |
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"CREATE TABLE IF NOT EXISTS cache(" |
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"key TEXT PRIMARY KEY," /* Key used to access the cache */ |
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"id INT REFERENCES blob," /* The cache content */ |
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"sz INT," /* Size of content in bytes */ |
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"tm INT," /* Last access time (unix timestamp) */ |
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"nref INT" /* Number of uses */ |
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");" |
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"CREATE TRIGGER IF NOT EXISTS cacheDel AFTER DELETE ON cache BEGIN" |
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" DELETE FROM blob WHERE id=OLD.id;" |
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"END;", |
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0, 0, 0 |
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); |
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if( rc!=SQLITE_OK ){ |
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sqlite3_close(db); |
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return 0; |
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} |
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} |
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return db; |
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} |
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/* |
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** Attempt to construct a prepared statement for the cache database. |
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*/ |
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static sqlite3_stmt *cacheStmt(sqlite3 *db, const char *zSql){ |
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sqlite3_stmt *pStmt = 0; |
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int rc; |
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rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0); |
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if( rc ){ |
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sqlite3_finalize(pStmt); |
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pStmt = 0; |
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} |
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return pStmt; |
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} |
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/* |
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** This routine implements an SQL function that renders a large integer |
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** compactly: ex: 12.3MB |
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*/ |
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static void cache_sizename( |
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sqlite3_context *context, |
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int argc, |
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sqlite3_value **argv |
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){ |
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char zBuf[30]; |
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double v, x; |
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assert( argc==1 ); |
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v = sqlite3_value_double(argv[0]); |
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x = v<0.0 ? -v : v; |
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if( x>=1e9 ){ |
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sqlite3_snprintf(sizeof(zBuf), zBuf, "%.1fGB", v/1e9); |
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}else if( x>=1e6 ){ |
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sqlite3_snprintf(sizeof(zBuf), zBuf, "%.1fMB", v/1e6); |
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}else if( x>=1e3 ){ |
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sqlite3_snprintf(sizeof(zBuf), zBuf, "%.1fKB", v/1e3); |
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}else{ |
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sqlite3_snprintf(sizeof(zBuf), zBuf, "%gB", v); |
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} |
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sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT); |
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} |
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/* |
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** Register the sizename() SQL function with the SQLite database |
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** connection. |
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*/ |
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static void cache_register_sizename(sqlite3 *db){ |
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sqlite3_create_function(db, "sizename", 1, SQLITE_UTF8, 0, |
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cache_sizename, 0, 0); |
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} |
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/* |
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** Attempt to write pContent into the cache. If the cache file does |
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** not exist, then this routine is a no-op. Older cache entries might |
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** be deleted. |
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*/ |
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void cache_write(Blob *pContent, const char *zKey){ |
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sqlite3 *db; |
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sqlite3_stmt *pStmt; |
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int rc = 0; |
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int nKeep; |
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db = cacheOpen(0); |
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if( db==0 ) return; |
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sqlite3_busy_timeout(db, 10000); |
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sqlite3_exec(db, "BEGIN IMMEDIATE", 0, 0, 0); |
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pStmt = cacheStmt(db, "INSERT INTO blob(data) VALUES(?1)"); |
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if( pStmt==0 ) goto cache_write_end; |
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sqlite3_bind_blob(pStmt, 1, blob_buffer(pContent), blob_size(pContent), |
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SQLITE_STATIC); |
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if( sqlite3_step(pStmt)!=SQLITE_DONE ) goto cache_write_end; |
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sqlite3_finalize(pStmt); |
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pStmt = cacheStmt(db, |
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"INSERT OR IGNORE INTO cache(key,sz,tm,nref,id)" |
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"VALUES(?1,?2,strftime('%s','now'),1,?3)" |
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); |
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if( pStmt==0 ) goto cache_write_end; |
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sqlite3_bind_text(pStmt, 1, zKey, -1, SQLITE_STATIC); |
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sqlite3_bind_int(pStmt, 2, blob_size(pContent)); |
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sqlite3_bind_int(pStmt, 3, sqlite3_last_insert_rowid(db)); |
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if( sqlite3_step(pStmt)!=SQLITE_DONE) goto cache_write_end; |
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rc = sqlite3_changes(db); |
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/* If the write was successful, truncate the cache to keep at most |
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** max-cache-entry entries in the cache. |
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** |
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** The cache entry replacement algorithm is approximately LRU |
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** (least recently used). However, each access of an entry buys |
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** that entry an extra hour of grace, so that more commonly accessed |
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** entries are held in cache longer. The extra "grace" allotted to |
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** an entry is limited to 2 days worth. |
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*/ |
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if( rc ){ |
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nKeep = db_get_int("max-cache-entry",10); |
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sqlite3_finalize(pStmt); |
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pStmt = cacheStmt(db, |
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"DELETE FROM cache WHERE rowid IN (" |
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"SELECT rowid FROM cache" |
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" ORDER BY (tm + 3600*min(nRef,48)) DESC" |
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" LIMIT -1 OFFSET ?1)"); |
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if( pStmt ){ |
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sqlite3_bind_int(pStmt, 1, nKeep); |
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sqlite3_step(pStmt); |
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} |
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} |
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cache_write_end: |
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sqlite3_finalize(pStmt); |
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sqlite3_exec(db, rc ? "COMMIT" : "ROLLBACK", 0, 0, 0); |
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sqlite3_close(db); |
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} |
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/* |
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** SETTING: max-cache-entry width=10 default=10 |
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** |
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** This is the maximum number of entries to allow in the web-cache |
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** for tarballs, ZIP-archives, and SQL-archives. |
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*/ |
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/* |
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** Attempt to read content out of the cache with the given zKey. Return |
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** non-zero on success and zero if unable to locate the content. |
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** |
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** Possible reasons for returning zero: |
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** (1) This server does not implement a cache |
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** (2) The requested element is not in the cache |
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*/ |
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int cache_read(Blob *pContent, const char *zKey){ |
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sqlite3 *db; |
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sqlite3_stmt *pStmt; |
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int rc = 0; |
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db = cacheOpen(0); |
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if( db==0 ) return 0; |
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sqlite3_busy_timeout(db, 10000); |
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sqlite3_exec(db, "BEGIN IMMEDIATE", 0, 0, 0); |
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pStmt = cacheStmt(db, |
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"SELECT blob.data FROM cache, blob" |
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" WHERE cache.key=?1 AND cache.id=blob.id"); |
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if( pStmt==0 ) goto cache_read_done; |
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sqlite3_bind_text(pStmt, 1, zKey, -1, SQLITE_STATIC); |
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if( sqlite3_step(pStmt)==SQLITE_ROW ){ |
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blob_append(pContent, sqlite3_column_blob(pStmt, 0), |
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sqlite3_column_bytes(pStmt, 0)); |
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rc = 1; |
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sqlite3_reset(pStmt); |
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pStmt = cacheStmt(db, |
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"UPDATE cache SET nref=nref+1, tm=strftime('%s','now')" |
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" WHERE key=?1"); |
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if( pStmt ){ |
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sqlite3_bind_text(pStmt, 1, zKey, -1, SQLITE_STATIC); |
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sqlite3_step(pStmt); |
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} |
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} |
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sqlite3_finalize(pStmt); |
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cache_read_done: |
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sqlite3_exec(db, "COMMIT", 0, 0, 0); |
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sqlite3_close(db); |
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return rc; |
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} |
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/* |
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** Create a cache database for the current repository if no such |
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** database already exists. |
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*/ |
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void cache_initialize(void){ |
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sqlite3_close(cacheOpen(1)); |
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} |
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/* |
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** COMMAND: cache* abbrv-subcom |
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** |
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** Usage: %fossil cache SUBCOMMAND |
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** |
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** Manage the cache used for potentially expensive web pages such as |
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** /zip and /tarball. SUBCOMMAND can be: |
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** |
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** clear Remove all entries from the cache. |
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** |
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** init Create the cache file if it does not already exist. |
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** |
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** list|ls List the keys and content sizes and other stats for |
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** all entries currently in the cache. |
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** |
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** size ?N? Query or set the maximum number of entries in the cache. |
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** |
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** status Show a summary of the cache status. |
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** |
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** The cache is stored in a file that is distinct from the repository |
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** but that is held in the same directory as the repository. The cache |
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** file can be deleted in order to completely disable the cache. |
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*/ |
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282
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void cache_cmd(void){ |
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283
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const char *zCmd; |
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284
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int nCmd; |
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sqlite3 *db; |
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286
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sqlite3_stmt *pStmt; |
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287
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db_find_and_open_repository(0,0); |
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zCmd = g.argc>=3 ? g.argv[2] : ""; |
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nCmd = (int)strlen(zCmd); |
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if( nCmd<=1 ){ |
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fossil_fatal("Usage: %s cache SUBCOMMAND", g.argv[0]); |
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293
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} |
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294
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if( strncmp(zCmd, "init", nCmd)==0 ){ |
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295
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db = cacheOpen(0); |
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296
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sqlite3_close(db); |
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297
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if( db ){ |
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298
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fossil_print("cache already exists in file %z\n", cacheName()); |
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299
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}else{ |
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300
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db = cacheOpen(1); |
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301
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sqlite3_close(db); |
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302
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if( db ){ |
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fossil_print("cache created in file %z\n", cacheName()); |
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}else{ |
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305
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fossil_fatal("unable to create cache file %z", cacheName()); |
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306
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} |
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307
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} |
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308
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}else if( strncmp(zCmd, "clear", nCmd)==0 ){ |
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309
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db = cacheOpen(0); |
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310
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if( db ){ |
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311
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sqlite3_exec(db, "DELETE FROM cache; DELETE FROM blob; VACUUM;",0,0,0); |
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312
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sqlite3_close(db); |
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313
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fossil_print("cache cleared\n"); |
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314
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}else{ |
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315
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fossil_print("nothing to clear; cache does not exist\n"); |
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316
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} |
|
317
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}else if( strncmp(zCmd, "list", nCmd)==0 |
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318
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|| strncmp(zCmd, "ls", nCmd)==0 |
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319
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|| strncmp(zCmd, "status", nCmd)==0 |
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320
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){ |
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321
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db = cacheOpen(0); |
|
322
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if( db==0 ){ |
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323
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fossil_print("cache does not exist\n"); |
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324
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}else{ |
|
325
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int nEntry = 0; |
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326
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char *zDbName = cacheName(); |
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327
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cache_register_sizename(db); |
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328
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pStmt = cacheStmt(db, |
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329
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"SELECT key, sizename(sz), nRef, datetime(tm,'unixepoch')" |
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330
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" FROM cache" |
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331
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" ORDER BY tm DESC" |
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332
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); |
|
333
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if( pStmt ){ |
|
334
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while( sqlite3_step(pStmt)==SQLITE_ROW ){ |
|
335
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if( zCmd[0]=='l' ){ |
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336
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fossil_print("%s %4d %8s %s\n", |
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337
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sqlite3_column_text(pStmt, 3), |
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338
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sqlite3_column_int(pStmt, 2), |
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339
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sqlite3_column_text(pStmt, 1), |
|
340
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sqlite3_column_text(pStmt, 0)); |
|
341
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} |
|
342
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nEntry++; |
|
343
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} |
|
344
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sqlite3_finalize(pStmt); |
|
345
|
} |
|
346
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sqlite3_close(db); |
|
347
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fossil_print( |
|
348
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"Filename: %s\n" |
|
349
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"Entries: %d\n" |
|
350
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"max-cache-entry: %d\n" |
|
351
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"Cache-file Size: %,lld\n", |
|
352
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zDbName, |
|
353
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nEntry, |
|
354
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db_get_int("max-cache-entry",10), |
|
355
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file_size(zDbName, ExtFILE) |
|
356
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); |
|
357
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fossil_free(zDbName); |
|
358
|
} |
|
359
|
}else if( strncmp(zCmd, "size", nCmd)==0 ){ |
|
360
|
if( g.argc>=4 ){ |
|
361
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int n = atoi(g.argv[3]); |
|
362
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if( n>=5 ) db_set_int("max-cache-entry",n,0); |
|
363
|
} |
|
364
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fossil_print("max-cache-entry: %d\n", db_get_int("max-cache-entry",10)); |
|
365
|
}else{ |
|
366
|
fossil_fatal("Unknown subcommand \"%s\"." |
|
367
|
" Should be one of: clear init list size status", zCmd); |
|
368
|
} |
|
369
|
} |
|
370
|
|
|
371
|
/* |
|
372
|
** Given a cache key, find the check-in hash and return it as a separate |
|
373
|
** string. The returned string is obtained from fossil_malloc() and must |
|
374
|
** be freed by the caller. |
|
375
|
** |
|
376
|
** Return NULL if not found. |
|
377
|
** |
|
378
|
** The key is usually in a format like these: |
|
379
|
** |
|
380
|
** /tarball/HASH/NAME |
|
381
|
** /zip/HASH/NAME |
|
382
|
** /sqlar/HASH/NAME |
|
383
|
*/ |
|
384
|
static char *cache_hash_of_key(const char *zKey){ |
|
385
|
int i; |
|
386
|
if( zKey==0 ) return 0; |
|
387
|
if( zKey[0]!='/' ) return 0; |
|
388
|
zKey++; |
|
389
|
while( zKey[0] && zKey[0]!='/' ) zKey++; |
|
390
|
if( zKey[0]==0 ) return 0; |
|
391
|
zKey++; |
|
392
|
for(i=0; zKey[i] && zKey[i]!='/'; i++){} |
|
393
|
if( !validate16(zKey, i) ) return 0; |
|
394
|
return fossil_strndup(zKey, i); |
|
395
|
} |
|
396
|
|
|
397
|
|
|
398
|
/* |
|
399
|
** WEBPAGE: cachestat |
|
400
|
** |
|
401
|
** Show information about the webpage cache. Requires Setup privilege. |
|
402
|
*/ |
|
403
|
void cache_page(void){ |
|
404
|
sqlite3 *db = 0; |
|
405
|
sqlite3_stmt *pStmt; |
|
406
|
int doInit; |
|
407
|
char *zDbName = cacheName(); |
|
408
|
int nEntry = 0; |
|
409
|
int mxEntry = 0; |
|
410
|
char zBuf[100]; |
|
411
|
|
|
412
|
login_check_credentials(); |
|
413
|
if( !g.perm.Setup ){ login_needed(0); return; } |
|
414
|
style_set_current_feature("cache"); |
|
415
|
style_header("Web Cache Status"); |
|
416
|
style_submenu_element("Refresh","%R/cachestat"); |
|
417
|
doInit = P("init")!=0 && cgi_csrf_safe(2); |
|
418
|
db = cacheOpen(doInit); |
|
419
|
if( db!=0 ){ |
|
420
|
if( P("clear")!=0 && cgi_csrf_safe(2) ){ |
|
421
|
sqlite3_exec(db, "DELETE FROM cache; DELETE FROM blob; VACUUM;",0,0,0); |
|
422
|
} |
|
423
|
cache_register_sizename(db); |
|
424
|
pStmt = cacheStmt(db, |
|
425
|
"SELECT key, sz, nRef, datetime(tm,'unixepoch')" |
|
426
|
" FROM cache" |
|
427
|
" ORDER BY (tm + 3600*min(nRef,48)) DESC" |
|
428
|
); |
|
429
|
if( pStmt ){ |
|
430
|
while( sqlite3_step(pStmt)==SQLITE_ROW ){ |
|
431
|
const unsigned char *zName = sqlite3_column_text(pStmt,0); |
|
432
|
char *zHash = cache_hash_of_key((const char*)zName); |
|
433
|
if( nEntry==0 ){ |
|
434
|
@ <h2>Current Cache Entries:</h2> |
|
435
|
@ <ol> |
|
436
|
} |
|
437
|
@ <li><p>%z(href("%R/cacheget?key=%T",zName))%h(zName)</a><br> |
|
438
|
@ size: %,lld(sqlite3_column_int64(pStmt,1)), |
|
439
|
@ hit-count: %d(sqlite3_column_int(pStmt,2)), |
|
440
|
@ last-access: %s(sqlite3_column_text(pStmt,3))Z \ |
|
441
|
if( zHash ){ |
|
442
|
@ → %z(href("%R/timeline?c=%S",zHash))check-in info</a>\ |
|
443
|
fossil_free(zHash); |
|
444
|
} |
|
445
|
@ </p></li> |
|
446
|
nEntry++; |
|
447
|
} |
|
448
|
sqlite3_finalize(pStmt); |
|
449
|
if( nEntry ){ |
|
450
|
@ </ol> |
|
451
|
} |
|
452
|
} |
|
453
|
} |
|
454
|
@ <h2>About The Web-Cache</h2> |
|
455
|
@ <p> |
|
456
|
@ The web-cache is a separate database file that holds cached copies |
|
457
|
@ tarballs, ZIP archives, and other pages that are expensive to compute |
|
458
|
@ and are likely to be reused. |
|
459
|
@ <form method="post"> |
|
460
|
login_insert_csrf_secret(); |
|
461
|
@ <ul> |
|
462
|
if( db==0 ){ |
|
463
|
@ <li> Web-cache is currently disabled. |
|
464
|
@ <input type="submit" name="init" value="Enable"> |
|
465
|
}else{ |
|
466
|
bigSizeName(sizeof(zBuf), zBuf, file_size(zDbName, ExtFILE)); |
|
467
|
mxEntry = db_get_int("max-cache-entry",10); |
|
468
|
@ <li> Filename of the cache database: <b>%h(zDbName)</b> |
|
469
|
@ <li> Size of the cache database: %s(zBuf) |
|
470
|
@ <li> Maximum number of entries: %d(mxEntry) |
|
471
|
@ <li> Number of cache entries used: %d(nEntry) |
|
472
|
@ <li> Change the max-cache-entry setting on the |
|
473
|
@ <a href="%R/setup_settings">Settings</a> page to adjust the |
|
474
|
@ maximum number of entries in the cache. |
|
475
|
@ <li><input type="submit" name="clear" value="Clear the cache"> |
|
476
|
@ <li> Disable the cache by manually deleting the cache database file. |
|
477
|
} |
|
478
|
@ </ul> |
|
479
|
@ </form> |
|
480
|
fossil_free(zDbName); |
|
481
|
if( db ) sqlite3_close(db); |
|
482
|
style_finish_page(); |
|
483
|
} |
|
484
|
|
|
485
|
/* |
|
486
|
** WEBPAGE: cacheget |
|
487
|
** |
|
488
|
** Usage: /cacheget?key=KEY |
|
489
|
** |
|
490
|
** Download a single entry for the cache, identified by KEY. |
|
491
|
** This page is normally a hyperlink from the /cachestat page. |
|
492
|
** Requires Admin privilege. |
|
493
|
*/ |
|
494
|
void cache_getpage(void){ |
|
495
|
const char *zKey; |
|
496
|
Blob content; |
|
497
|
|
|
498
|
login_check_credentials(); |
|
499
|
if( !g.perm.Setup ){ login_needed(0); return; } |
|
500
|
zKey = PD("key",""); |
|
501
|
blob_zero(&content); |
|
502
|
if( cache_read(&content, zKey)==0 ){ |
|
503
|
style_set_current_feature("cache"); |
|
504
|
style_header("Cache Download Error"); |
|
505
|
@ The cache does not contain any entry with this key: "%h(zKey)" |
|
506
|
style_finish_page(); |
|
507
|
return; |
|
508
|
} |
|
509
|
cgi_set_content(&content); |
|
510
|
cgi_set_content_type("application/x-compressed"); |
|
511
|
} |
|
512
|
|