lua

How I can to get custom options in the `init` function of the Tarantool Cartridge role?

由 ぃ、小莉子 提交于 2021-01-27 05:14:39
问题 A Tarantool Cartridge role file has a function init . I want to get my custom options from the instance.yml file. But the opts variable doesn't have it. How I can do it? 回答1: Cartridge has a built-in module called "argparse". It parses a few sources of configuration and combines them together: instances.yml or files in /etc/tarantool/conf.d command line arguments environment variables starting with TARANTOOL_ Cartridge uses this module to get various pieces of configuration like the port

Unable to find Lua headers with find_package in cmake

由 有些话、适合烂在心里 提交于 2021-01-27 03:54:55
问题 I'm trying to use CMake to build generate the make file for a project of mine that uses Lua. When I run make I get this error: /path/to/my/project/luaudio/luaudio.c:1:17: fatal error: lua.h: No such file or directory In the CMakeLists.txt file, I have the following lines, which I thought would do it, but apparently they're not enough: find_package(Lua51 REQUIRED) set(Luaudio_INCLUDE_DIRS ${Luaudio_SOURCE_DIR} ${Lua51_INCLUDE_DIRS} PARENT_SCOPE) include_directories(${Luaudio_INCLUDE_DIRS})

Unable to find Lua headers with find_package in cmake

由 眉间皱痕 提交于 2021-01-27 03:54:13
问题 I'm trying to use CMake to build generate the make file for a project of mine that uses Lua. When I run make I get this error: /path/to/my/project/luaudio/luaudio.c:1:17: fatal error: lua.h: No such file or directory In the CMakeLists.txt file, I have the following lines, which I thought would do it, but apparently they're not enough: find_package(Lua51 REQUIRED) set(Luaudio_INCLUDE_DIRS ${Luaudio_SOURCE_DIR} ${Lua51_INCLUDE_DIRS} PARENT_SCOPE) include_directories(${Luaudio_INCLUDE_DIRS})

每日一面

由 强颜欢笑 提交于 2021-01-26 08:11:58
麻烦大家帮我 投一票 哈，谢谢 什么是分布式锁 针对共享内存模型的程序（例如JAVA程序），锁就是一个非常常用的机制。 一般简单分为悲观锁和乐观锁。悲观锁就是你获取这块数据的锁之后，别人就无法访问或操作这块数据，直到你释放这个锁。乐观锁一般就是CAS更新。 在单进程内内存的锁，只控制进程内数据的，就是非分布式锁。相反的，跨进程，需要锁住多个进程访问数据的锁就是分布式锁。 悲观锁一般由Redis的 SETNXEX 实现，Key 为资源名，EX 设置一个合理的超时时间， Value 设置为一个客户端生成的在超时时间内不会重复的随机字符串。 lua脚本特性说明 由于redis是单线程的，执行lua脚本的时候，不会同时执行其他客户端命令，这一定程度上保证了并发安全 单进程Redis分布式悲观锁实现思路 悲观锁一般由Redis的 SETNX 实现，通过 SETNX 获取一个锁，释放锁就把这个Key删除即可。 例如，获取一个名为TestLock的锁，通过 SETNX TestLock TestLockValue ，TestLockValue随意设置一个值。 SETNX 是SET IF NOT EXISTS，如果不存在就会设置成功。 设置成功会返回1，没设置成功会返回0。返回1代表获取锁成功，0代表没获取成功。 释放锁调用 DEL 命令，通过 DEL TestLock 释放锁

Interprocess communication in Lua with Example?

由 霸气de小男生 提交于 2021-01-21 10:26:32
问题 I have been struggling a lot to get this to work. Can someone provide an example with any LUA api of 2 scripts that pass a message back and forth. I have tried Oil, lua-ipc and zeromq. But I face several missing libraries issues. The ultimate goal is to pass a vector of numbers from one Lua process to another Lua process (with a different version of Lua) without going through disk. Here is a similar example in python of IPC in a single file. Something similar in lua would be extremely helpful

Lua 'require' but files are only in memory

由 [亡魂溺海] 提交于 2021-01-21 04:09:30
问题 Setting: I'm using Lua from a C/C++ environment. I have several lua files on disk. Those are read into memory and some more memory-only lua files become available during runtime. Think e.g. of an editor, with additional unsaved lua files. So, I have a list<identifier, lua_file_content> in memory. Some of these files have require statements in them. When I try to load all these files to a lua instance (currently via lua_dostring ) I get attempt to call global require (a nil value) . Is there a

Lua 'require' but files are only in memory

由 纵饮孤独 提交于 2021-01-21 04:08:58
问题 Setting: I'm using Lua from a C/C++ environment. I have several lua files on disk. Those are read into memory and some more memory-only lua files become available during runtime. Think e.g. of an editor, with additional unsaved lua files. So, I have a list<identifier, lua_file_content> in memory. Some of these files have require statements in them. When I try to load all these files to a lua instance (currently via lua_dostring ) I get attempt to call global require (a nil value) . Is there a

Lua 'require' but files are only in memory

由 隐身守侯 提交于 2021-01-21 04:07:42
问题 Setting: I'm using Lua from a C/C++ environment. I have several lua files on disk. Those are read into memory and some more memory-only lua files become available during runtime. Think e.g. of an editor, with additional unsaved lua files. So, I have a list<identifier, lua_file_content> in memory. Some of these files have require statements in them. When I try to load all these files to a lua instance (currently via lua_dostring ) I get attempt to call global require (a nil value) . Is there a

Lua 'require' but files are only in memory

由 若如初见. 提交于 2021-01-21 04:07:13
问题 Setting: I'm using Lua from a C/C++ environment. I have several lua files on disk. Those are read into memory and some more memory-only lua files become available during runtime. Think e.g. of an editor, with additional unsaved lua files. So, I have a list<identifier, lua_file_content> in memory. Some of these files have require statements in them. When I try to load all these files to a lua instance (currently via lua_dostring ) I get attempt to call global require (a nil value) . Is there a

proxy_pass does not resolve DNS using /etc/hosts

由 本秂侑毒 提交于 2021-01-20 18:00:12
问题 In nginx the proxy_pass directive is not resolving DNS using the /etc/hosts file. Any way to enable this possibility (maybe by leveraging Lua as a last resort)? 回答1: In short, you need to install dnsmasq locally and use 127.0.0.1 as a resolver. See this related question and answer: When using proxy_pass, can /etc/hosts be used to resolve domain names instead of "resolver"? 回答2: If you have a server with systemd you can use the nameserver shipped with it, systemd-resolved, to resolve your
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