mirror of https://github.com/tstack/lnav
[listview] get a batch of rows from the source instead of a single one at a time
Also: bump to c++14 and added a helper template for creating sqlite virtual tablespull/111/merge
Timothy Stack
7 years ago
parent
8b7c9ca598
commit
fa296fca1b
@ -1,6 +1,6 @@
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cmake_minimum_required (VERSION 2.6)
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SET(CMAKE_CXX_STANDARD 11)
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SET(CMAKE_CXX_STANDARD 14)
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project (lnav)
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add_subdirectory(src)
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add_subdirectory(test)
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@ -0,0 +1,34 @@
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# =============================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_14.html
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# =============================================================================
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#
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# SYNOPSIS
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#
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# AX_CXX_COMPILE_STDCXX_14([ext|noext], [mandatory|optional])
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#
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# DESCRIPTION
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#
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# Check for baseline language coverage in the compiler for the C++14
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# standard; if necessary, add switches to CXX and CXXCPP to enable
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# support.
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#
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# This macro is a convenience alias for calling the AX_CXX_COMPILE_STDCXX
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# macro with the version set to C++14. The two optional arguments are
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# forwarded literally as the second and third argument respectively.
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# Please see the documentation for the AX_CXX_COMPILE_STDCXX macro for
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# more information. If you want to use this macro, you also need to
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# download the ax_cxx_compile_stdcxx.m4 file.
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#
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# LICENSE
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#
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# Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 5
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AX_REQUIRE_DEFINED([AX_CXX_COMPILE_STDCXX])
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AC_DEFUN([AX_CXX_COMPILE_STDCXX_14], [AX_CXX_COMPILE_STDCXX([14], [$1], [$2])])
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@ -0,0 +1,34 @@
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/**
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* Copyright (c) 2017, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "vtab_module.hh"
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std::string vtab_module_schemas;
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@ -0,0 +1,287 @@
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/**
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* Copyright (c) 2017, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __vtab_module_hh
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#define __vtab_module_hh
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#include <sqlite3.h>
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#include <string>
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#include <utility>
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#include "lnav_log.hh"
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template<typename T>
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inline T from_sqlite(sqlite3_value *val)
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{
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return T();
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}
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template<>
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inline int64_t from_sqlite<int64_t>(sqlite3_value *val)
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{
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return sqlite3_value_int64(val);
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}
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template<>
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inline const char *from_sqlite<const char *>(sqlite3_value *val)
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{
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return (const char *) sqlite3_value_text(val);
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}
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template<>
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inline double from_sqlite<double>(sqlite3_value *val)
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{
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return sqlite3_value_double(val);
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}
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extern std::string vtab_module_schemas;
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template<typename T>
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struct vtab_module {
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static int tvt_create(sqlite3 *db,
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void *pAux,
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int argc, const char *const *argv,
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sqlite3_vtab **pp_vt,
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char **pzErr) {
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static typename T::vtab vt;
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*pp_vt = vt;
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return sqlite3_declare_vtab(db, T::CREATE_STMT);
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};
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template<typename ... Args, size_t... Idx>
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static int apply_impl(T &obj, int (T::*func)(sqlite3_vtab *, int64_t &, Args...), sqlite3_vtab *tab, int64_t &rowid, sqlite3_value **argv, std::index_sequence<Idx...>)
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{
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return (obj.*func)(tab, rowid, from_sqlite<Args>(argv[Idx])...);
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}
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template<typename ... Args>
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static int apply(T &obj,
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int (T::*func)(sqlite3_vtab *, int64_t &, Args...),
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sqlite3_vtab *tab,
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int64_t &rowid,
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int argc,
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sqlite3_value **argv)
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{
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require(sizeof...(Args) == 0 || argc == sizeof...(Args));
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return apply_impl(obj,
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func,
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tab,
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rowid,
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argv,
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std::make_index_sequence<sizeof...(Args)>{});
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}
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static int tvt_destructor(sqlite3_vtab *p_svt)
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{
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return SQLITE_OK;
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}
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static int tvt_open(sqlite3_vtab *p_svt, sqlite3_vtab_cursor **pp_cursor)
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{
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p_svt->zErrMsg = NULL;
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typename T::cursor *p_cur = new (typename T::cursor)(p_svt);
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if (p_cur == NULL) {
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return SQLITE_NOMEM;
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} else {
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*pp_cursor = (sqlite3_vtab_cursor *) p_cur;
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}
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return SQLITE_OK;
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}
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static int tvt_next(sqlite3_vtab_cursor *cur)
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{
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typename T::cursor *p_cur = (typename T::cursor *) cur;
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return p_cur->next();
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}
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static int tvt_eof(sqlite3_vtab_cursor *cur)
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{
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typename T::cursor *p_cur = (typename T::cursor *) cur;
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return p_cur->eof();
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}
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static int tvt_close(sqlite3_vtab_cursor *cur)
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{
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typename T::cursor *p_cur = (typename T::cursor *) cur;
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delete p_cur;
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return SQLITE_OK;
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}
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static int tvt_rowid(sqlite3_vtab_cursor *cur, sqlite_int64 *p_rowid) {
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typename T::cursor *p_cur = (typename T::cursor *) cur;
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return p_cur->get_rowid(*p_rowid);
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};
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static int tvt_column(sqlite3_vtab_cursor *cur, sqlite3_context *ctx, int col) {
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typename T::cursor *p_cur = (typename T::cursor *) cur;
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T handler;
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return handler.get_column(*p_cur, ctx, col);
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};
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static int vt_best_index(sqlite3_vtab *tab, sqlite3_index_info *p_info) {
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return SQLITE_OK;
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};
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static int vt_filter(sqlite3_vtab_cursor *p_vtc,
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int idxNum, const char *idxStr,
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int argc, sqlite3_value **argv) {
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return SQLITE_OK;
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}
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static int tvt_update(sqlite3_vtab *tab,
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int argc,
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sqlite3_value **argv,
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sqlite_int64 *rowid) {
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T handler;
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if (argc <= 1) {
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int64_t rowid = sqlite3_value_int64(argv[0]);
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return handler.delete_row(tab, rowid);
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}
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if (sqlite3_value_type(argv[0]) == SQLITE_NULL) {
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int64_t *rowid2 = rowid;
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return vtab_module<T>::apply(handler, &T::insert_row, tab, *rowid2, argc - 2, argv + 2);
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}
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int64_t index = sqlite3_value_int64(argv[0]);
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if (index != sqlite3_value_int64(argv[1])) {
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tab->zErrMsg = sqlite3_mprintf(
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"The rowids in the lnav_views table cannot be changed");
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return SQLITE_ERROR;
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}
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return vtab_module<T>::apply(handler, &T::update_row, tab, index, argc - 2, argv + 2);
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};
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vtab_module() noexcept {
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memset(&this->vm_module, 0, sizeof(this->vm_module));
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this->vm_module.iVersion = 0;
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this->vm_module.xCreate = tvt_create;
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this->vm_module.xConnect = tvt_create;
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this->vm_module.xOpen = tvt_open;
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this->vm_module.xNext = tvt_next;
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this->vm_module.xEof = tvt_eof;
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this->vm_module.xClose = tvt_close;
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this->vm_module.xDestroy = tvt_destructor;
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this->vm_module.xRowid = tvt_rowid;
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this->vm_module.xDisconnect = tvt_destructor;
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this->vm_module.xBestIndex = vt_best_index;
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this->vm_module.xFilter = vt_filter;
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this->vm_module.xColumn = tvt_column;
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this->vm_module.xUpdate = tvt_update;
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};
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int create(sqlite3 *db, const char *name) {
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vtab_module_schemas += T::CREATE_STMT;
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return sqlite3_create_module(db, name, &this->vm_module, NULL);
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};
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sqlite3_module vm_module;
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};
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template<typename T>
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struct tvt_iterator_cursor {
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struct cursor {
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sqlite3_vtab_cursor base;
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typename T::iterator iter;
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cursor(sqlite3_vtab *vt) {
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T handler;
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this->base.pVtab = vt;
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this->iter = handler.begin();
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};
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int next() {
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T handler;
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if (this->iter != handler.end()) {
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++this->iter;
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}
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return SQLITE_OK;
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};
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int eof() {
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T handler;
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return this->iter == handler.end();
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};
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int get_rowid(sqlite_int64 &rowid_out) {
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T handler;
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rowid_out = std::distance(handler.begin(), this->iter);
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return SQLITE_OK;
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};
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};
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};
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template<typename T>
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struct tvt_no_update : public T {
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int delete_row(sqlite3_vtab *vt, int64_t rowid) {
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vt->zErrMsg = sqlite3_mprintf(
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"Rows cannot be deleted from this table");
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return SQLITE_ERROR;
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};
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int insert_row(sqlite3_vtab *tab, int64_t &rowid_out) {
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tab->zErrMsg = sqlite3_mprintf(
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"Rows cannot be inserted into this table");
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return SQLITE_ERROR;
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};
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int update_row(sqlite3_vtab *tab, int64_t &rowid_out) {
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tab->zErrMsg = sqlite3_mprintf(
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"Rows cannot be update in this table");
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return SQLITE_ERROR;
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};
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};
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#endif
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Reference in New Issue