#mudlet use lua socket

#Mudlet use lua socket how to#

#Mudlet use lua socket portable#

#Mudlet use lua socket code#

The following blocking socket example is similar to the one above, but uses the NTP UDP protocol. Note: the connection will automatically close when the garbage collector kicks in, but it is good practice to close the connection when you are done using it. Line 12: Closes the socket connection.Line 10: Emits the time as part of the LSP response.Line 8-9: Translates raw response data to Unix time.The function blocks until the time server sends a response. Line 5: Reads response data from the time server.The function blocks until the socket connection completes.

#Mudlet use lua socket how to#

The following LSP example shows how to design a page that opens a blocking socket connection, sends a request to a time server, and waits for the response.Įxample 1: Blocking socket example, implementing a request/response. The Lua Server Page completes execution and the thread is then inserted back into the thread pool, where it waits for another request. The Lua Server Page then assembles the response message and sends the response message to the browser user. The Lua Server Page resumes execution when it receives a response from the other server. The blocking socket connection in the Lua Server Page waits for the response from the other server, and, by doing so, it blocks the thread executing the Lua Server Page. The Lua Server Page opens a connection to another server, sends a request, and waits for a response. The following diagram shows how a browser user sends a request to the Barracuda Server, where a Lua Server Page is triggered and executed as part of the request. A typical use case for blocking sockets is for a Lua Server Page to act as a network client to another service. Lua Server Pages run in the context of one of the threads in the HTTP Thread Pool. See the section Advanced Lua Bindings for information on how the native threads are designed to work cooperatively. Each native thread is mapped to one Lua coroutine, thus making sure each call into the Lua VM has its own Lua stack. The native threads only yield at known locations, such as when blocking on socket read.

#Mudlet use lua socket code#

Lua is not preemptive and native threads executing Lua code are designed to run cooperatively. We have highlighted the threads that can be used when working with blocking sockets.īlocking sockets must run in the context of one of the Barracuda Server's worker threads (HTTP Server Thread Pool) or in a thread in the Lua Thread Library. The following diagram from section Thread Mapping and Coroutines shows the native threads that may call into and interact with Lua code in a running system. The source code for the examples in this document can be downloaded from GitHub. See the platform's readme file for details. Note that cosockets are not available on some of the RTOS environments due to limitations in the TCP/IP stack. Cosockets run in the context of the native thread powering the Barracuda Server's socket dispatcher and enable you to design communication protocols that can scale up to a large number of connections.

Cosockets are fully asynchronous, where both socket receive and socket send are non blocking.

Socket receive events run in the context of the Barracuda Server's socket dispatcher and the receive events must for this reason not call any functions that may block the socket dispatcher. Asynchronous sockets enable your program to wait asynchronously for any number of socket connections simultaneously.

Asynchronous sockets are non blocking on receive and blocking on send.

Blocking sockets must run in the context of a worker thread and must under no circumstances run in the context of the native thread powering the Barracuda Server's socket dispatcher.

It is important that you familiarize yourself with these three socket modes since selecting the wrong mode may temporarily block and prevent the Barracuda Server from serving client requests. The Lua socket library supports three socket modes: standard blocking sockets, asynchronous sockets, and cosockets. The Lua socket library also includes client and server WebSocket functionality. The Lua socket library provides high level access to the system's or device's TCP/IP stack.

#Mudlet use lua socket portable#

The Barracuda Server provides a socket API that is portable across all supported platforms, including deep embedded systems. The auxiliary Lua socket library is an optional library that provides TCP Lua bindings for the Barracuda Server's socket API. Using the Socket Library Designing Socket Protocols in Lua

#Mudlet use lua socket code

#Mudlet use lua socket free

The below functions (table.save, table.load) can be used to save individual Lua tables to disc and load It saves the contents of _saveTable into a file for persistence. This function should primarily be used by Mudlet. Local l_SettingsFile = getMudletHomeDir(). If string.char( getMudletHomeDir(): byte()) = "/ " then and unpacks them into the global namespace. It loads saved settings in from the Mudlet home directory This function should be primarily used by Mudlet. They are saved to "a" when the profile is closed or saved. Variables are automatically unpacked into the global namespace when the profile is loaded. This function flags a variable to be saved by Mudlet's variable persistence system. If (a and ( not b)) or (b and ( not a)) then Implementation of boolean exclusive or. if io.exists("/home/user/Desktop/file.txt") then if io.exists("/home/user/Desktop") then If it exists, it'll return the Lua true boolean value, otherwise false. Checks to see if a given file or folder exists. Return setScript(name, getScript(name, pos).

#Mudlet use lua socket code

"!) ")Īssert( type(luaCode) = "string ", "appendScript: bad argument #2 type (lua code as string expected, got ". Return group_creation_functions(name, parent)įunction appendScript( name, luaCode, pos)Īssert( type(name) = "string ", "appendScript: bad argument #1 type (script name as string expected, got ". permGroup("Defensive aliases", "alias")įunction permGroup( name, itemtype, parent)Īssert( type(name) = "string ", "permGroup: need a name for the new thing ")Īssert(group_creation_functions, "permGroup: ". if exists("Defensive aliases", "alias") = 0 then create a new alias group only if one doesn't exist already permGroup("Combat triggers", "trigger") parent optional name of existing item which the new item itemtype type of the item - can be trigger, alias, or timer Creates a group of a given type that will persist through sessions. Return not ( permScript(name, parent, " ", " ") = - 1) Return not ( permKey(name, parent, - 1, " ") = - 1) Return not ( permAlias(name, parent, " ", " ") = - 1) Return not ( permSubstringTrigger(name, parent,, " ") = - 1) Return not ( permTimer(name, parent, 0, " ") = - 1) Table of functions used by permGroup to create the appropriate group, based on itemtype. sendAll("stand", "wield shield", "say ha!", false) Use sendAll and do not echo sent command on the main window. sendAll("stand", "wield shield", "say ha!") Use sendAll instead of multiple send commands. echoTheValue optional boolean flag (default value is true) which determine if value should to use multiple send() commands one after another. You can use this to send some things at once instead of having for using event handlers and parsing its messages into Lua datastructures. A ATCP demo package is also available on the forums

#Mudlet use lua socket free

Feel free to experiment with this to achieve the desired results. register RoomExits as the event handler, make the script name be process_exits, and use this in the script: For example, if you'd like to listen to the RoomExits event and have it call the process_exits() function. name in the script you'd like to be called. You do that by setting the Script name: to the function should it call for you when your handler receives a message. Next, because scripts in Mudlet can have multiple functions, you need to tell Mudlet which function the event name you'd like your script to listen to into the Add User Defined Event Handler: field and press the + button While the concept of handlers for events is to be explained elsewhere in the manual, the quick rundown is this - place The ATCP handler names follow the same format as the atcp table - RoomNum, RoomExits, CharVitals and so on. If you'd like to trigger on ATCP messages, then you need to create scripts to attach handlers to the ATCP messages. removed - so it becomes CharVitals and RoomExits. Note that while the typical message comes in the format of Module.Submodule, ie Char.Vitals or Room.Exits, in Mudlet the dot is To find out the available messages available in the atcp table and the event names, raised for each ATCP message that arrives. Whenever new data arrives, the previous is overwritten. The latest ATCP data is stored in the atcp table. such that any it should work on others. This is primarily available on IRE-based MUDs, but Mudlet's implementation is generic enough Extending default libraries makes Babelfish happy. tripped up on number representation differences (. enforce uniform locale so scripts don't get