diff options
Diffstat (limited to 'pydis_site/apps/content/resources/guides')
4 files changed, 146 insertions, 0 deletions
diff --git a/pydis_site/apps/content/resources/guides/python-guides/discord-embed-limits.md b/pydis_site/apps/content/resources/guides/python-guides/discord-embed-limits.md new file mode 100644 index 00000000..ca97462b --- /dev/null +++ b/pydis_site/apps/content/resources/guides/python-guides/discord-embed-limits.md @@ -0,0 +1,21 @@ +--- +title: Discord Embed Limits +description: A guide that shows the limits of embeds in Discord and how to avoid them. +--- + +If you plan on using embed responses for your bot you should know the limits of the embeds on Discord or you will get `Invalid Form Body` errors: + +- Embed **title** is limited to **256 characters** +- Embed **description** is limited to **4096 characters** +- An embed can contain a maximum of **25 fields** +- A **field name/title** is limited to **256 character** and the **value of the field** is limited to **1024 characters** +- Embed **footer** is limited to **2048 characters** +- Embed **author name** is limited to **256 characters** +- The **total of characters** allowed in an embed is **6000** + +Now if you need to get over this limit (for example for a help command), you would need to use pagination. +There are several ways to do that: + +- A library called **[disputils](https://pypi.org/project/disputils)** +- An experimental library made by the discord.py developer called **[discord-ext-menus](https://github.com/Rapptz/discord-ext-menus)** +- Make your own setup using **[wait_for()](https://discordpy.readthedocs.io/en/stable/ext/commands/api.html#discord.ext.commands.Bot.wait_for)** and wait for a reaction to be added diff --git a/pydis_site/apps/content/resources/guides/python-guides/discordpy_help_command.md b/pydis_site/apps/content/resources/guides/python-guides/discordpy_help_command.md new file mode 100644 index 00000000..4b475146 --- /dev/null +++ b/pydis_site/apps/content/resources/guides/python-guides/discordpy_help_command.md @@ -0,0 +1,66 @@ +--- +title: Custom Help Command +description: "Overwrite discord.py's help command to implement custom functionality" +--- + +First, a basic walkthrough can be found [here](https://gist.github.com/InterStella0/b78488fb28cadf279dfd3164b9f0cf96) by Stella#2000 on subclassing the HelpCommand. It will provide some foundational knowledge that is required before attempting a more customizable help command. + +## Custom Subclass of Help Command +If the types of classes of the HelpCommand do not fit your needs, you can subclass HelpCommand and use the class mehods to customize the output. Below is a simple demonstration using the following methods that can also be found on the documenation: + +- [filter_commands](https://discordpy.readthedocs.io/en/stable/ext/commands/api.html#discord.ext.commands.HelpCommand.filter_commands) + +- [send_group_help](https://discordpy.readthedocs.io/en/stable/ext/commands/api.html#discord.ext.commands.HelpCommand.send_bot_help) + +- [send_command_help](https://discordpy.readthedocs.io/en/stable/ext/commands/api.html#discord.ext.commands.HelpCommand.send_command_help) + +- [send_group_help](https://discordpy.readthedocs.io/en/stable/ext/commands/api.html#discord.ext.commands.HelpCommand.send_group_help) + +- [send_error_message](https://discordpy.readthedocs.io/en/stable/ext/commands/api.html#discord.ext.commands.HelpCommand.send_error_message) + +```python +class MyHelp(commands.HelpCommand): + + async def send_bot_help(self, mapping): + """ + This is triggered when !help is invoked. + + This example demonstrates how to list the commands that the member invoking the help command can run. + """ + filtered = await self.filter_commands(self.context.bot.commands, sort=True) # returns a list of command objects + names = [command.name for command in filtered] # iterating through the commands objects getting names + available_commands = "\n".join(names) # joining the list of names by a new line + embed = disnake.Embed(description=available_commands) + await self.context.send(embed=embed) + + async def send_command_help(self, command): + """This is triggered when !help <command> is invoked.""" + await self.context.send("This is the help page for a command") + + async def send_group_help(self, group): + """This is triggered when !help <group> is invoked.""" + await self.context.send("This is the help page for a group command") + + async def send_cog_help(self, cog): + """This is triggered when !help <cog> is invoked.""" + await self.context.send("This is the help page for a cog") + + async def send_error_message(self, error): + """If there is an error, send a embed containing the error.""" + channel = self.get_destination() # this defaults to the command context channel + await channel.send(error) + +bot.help_command = MyHelp() +``` + +You can handle when a user does not pass a command name when invoking the help command and make a fancy and customized embed; here a page that describes the bot and shows a list of commands is generally used. However if a command is passed in, you can display detailed information of the command. Below are references from the documentation below that can be utilised: + +- [Get the command object](https://discordpy.readthedocs.io/en/latest/ext/commands/api.html#discord.ext.commands.Bot.get_command) + +- [Get the command name](https://discordpy.readthedocs.io/en/latest/ext/commands/api.html#discord.ext.commands.Command.name) + +- [Get the command aliases](https://discordpy.readthedocs.io/en/latest/ext/commands/api.html#discord.ext.commands.Command.aliases) + +- [Get the command brief](https://discordpy.readthedocs.io/en/latest/ext/commands/api.html#discord.ext.commands.Command.brief) + +- [Get the command usage](https://discordpy.readthedocs.io/en/latest/ext/commands/api.html#discord.ext.commands.Command.usage) diff --git a/pydis_site/apps/content/resources/guides/python-guides/vps-services.md b/pydis_site/apps/content/resources/guides/python-guides/vps-services.md new file mode 100644 index 00000000..0acd3e55 --- /dev/null +++ b/pydis_site/apps/content/resources/guides/python-guides/vps-services.md @@ -0,0 +1,31 @@ +--- +title: VPS Services +description: On different VPS services +--- + +If you need to run your bot 24/7 (with no downtime), you should consider using a virtual private server (VPS). This is a list of VPS services that are sufficient for running Discord bots. + +* Europe + * [netcup](https://www.netcup.eu/) + * Germany & Austria data centres. + * Great affiliate program. + * [Yandex Cloud](https://cloud.yandex.ru/) + * Vladimir, Ryazan, and Moscow region data centres. + * [Scaleway](https://www.scaleway.com/) + * France data centre. + * [Time 4 VPS](https://www.time4vps.eu/) + * Lithuania data centre. +* US + * [GalaxyGate](https://galaxygate.net/) + * New York data centre. + * Great affiliate program. +* Global + * [Linode](https://www.linode.com/) + * [Digital Ocean](https://www.digitalocean.com/) + * [OVHcloud](https://www.ovhcloud.com/) + * [Vultr](https://www.vultr.com/) + +--- +# Free hosts +There are no reliable free options for VPS hosting. If you would rather not pay for a hosting service, you can consider self-hosting. +Any modern hardware should be sufficient for running a bot. An old computer with a few GB of ram could be suitable, or a Raspberry Pi. diff --git a/pydis_site/apps/content/resources/guides/python-guides/why-not-json-as-database.md b/pydis_site/apps/content/resources/guides/python-guides/why-not-json-as-database.md new file mode 100644 index 00000000..ae34c2b4 --- /dev/null +++ b/pydis_site/apps/content/resources/guides/python-guides/why-not-json-as-database.md @@ -0,0 +1,28 @@ +--- +title: Why JSON is unsuitable as a database +description: The many reasons why you shouldn't use JSON as a database, and instead opt for SQL. +relevant_links: + Tips on Storing Data: https://tutorial.vcokltfre.dev/tips/storage/ +--- + +JSON, quite simply, is not a database. It's not designed to be a data storage format, +rather a wayof transmitting data over a network. It's also often used as a way of doing configuration files for programs. + +There is no redundancy built in to JSON. JSON is just a format, and Python has libraries for it +like json and ujson that let you load and dump it, sometimes to files, but that's all it does, write data to a file. +There is no sort of DBMS (Database Management System), which means no sort of sophistication in how the data is stored, +or built in ways to keep it safe and backed up, there's no built in encryption either - bear in mind +in larger applications encryption may be necessary for GDPR/relevant data protection regulations compliance. + +JSON, unlike relational databases, has no way to store relational data, +which is a very commonly needed way of storing data. +Relational data, as the name may suggest, is data that relates to other data. +For example if you have a table of users and a table of servers, the server table will probably have an owner field, +where you'd reference a user from the users table. (**This is only relevant for relational data**). + +JSON is primarily a KV (key-value) format, for example `{"a": "b"}` where `a` is the key and `b` is the value, +but what if you want to search not by that key but by a sub-key? Well, instead of being able to quickly use `var[key]`, +which in a Python dictionary has a constant return time (for more info look up hash tables), +you now have to iterate through every object in the dictionary and compare to find what you're looking for. +Most relational database systems, like MySQL, MariaDB, and PostgreSQL have ways of indexing secondary fields +apart from the primary key so that you can easily search by multiple attributes. |