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|
use anyhow::{anyhow, bail, Context as _, Error, Result};
use serde::{Deserialize, Serialize};
use serde_json::de::Deserializer;
use serenity::{
all::{
CommandDataOptionValue, CommandInteraction, CommandOptionType, CommandType, Member, RoleId,
},
builder::{
CreateCommand, CreateCommandOption, CreateInteractionResponse,
CreateInteractionResponseMessage,
},
client::Context,
model::Permissions,
};
use sqlx::SqlitePool;
use std::process::Stdio;
use tokio::{io::AsyncWriteExt, process::Command};
use crate::utils::EnumAsArray;
#[derive(Debug, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct DiscocamlConfig {
pub command: Vec<String>,
pub role: RoleId,
}
#[derive(Debug, Serialize)]
struct DiscocamlRequest {
expr: String,
command: DiscocamlCommand,
}
#[derive(Debug, Serialize)]
enum DiscocamlCommand {
Roundtrip,
}
#[derive(Debug, Deserialize)]
#[serde(deny_unknown_fields)]
enum DiscocamlResponse {
Error(String),
}
pub fn command() -> CreateCommand {
CreateCommand::new("discocaml")
.kind(CommandType::ChatInput)
.default_member_permissions(Permissions::empty())
.dm_permission(true)
.description("Sends this expression to the disco!")
.add_option(
CreateCommandOption::new(
CommandOptionType::String,
"expr",
"The expression to operate on.",
)
.required(true),
)
}
async fn check_permissions(config: &DiscocamlConfig, member: &Option<Box<Member>>) -> Result<()> {
if let Some(member) = member {
if !member.roles.contains(&config.role) {
bail!("This command can only be used by <@&{}>.", config.role)
}
Ok(())
} else {
bail!("This command cannot be used in DMs.")
}
}
async fn respond_with_error(ctx: &Context, command: &CommandInteraction, err: &Error) {
let msg = CreateInteractionResponseMessage::new().content(format!(":no_entry_sign: {}", err));
if let Err(err) = command
.create_response(ctx, CreateInteractionResponse::Message(msg))
.await
{
log::error!(
"failed to respond to command that failed permissions check: {:?}",
err
)
}
}
async fn run_discocaml(
config: &DiscocamlConfig,
req: &DiscocamlRequest,
) -> Result<DiscocamlResponse> {
let mut child = Command::new(&config.command[0])
.args(&config.command)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.kill_on_drop(true)
.spawn()
.context("failed to start discocaml")?;
let mut stdin = child.stdin.take().unwrap();
let req = serde_json::to_string(req).context("failed to serialize request to discocaml")?;
stdin
.write_all(req.as_bytes())
.await
.context("failed to write request to discocaml")?;
stdin
.shutdown()
.await
.context("failed to close pipe to discocaml")?;
drop(stdin);
drop(req);
let output = child
.wait_with_output()
.await
.context("failed to wait for discocaml to complete")?;
if !output.status.success() {
bail!("discocaml exited with non-zero status {:?}", output.status)
}
let mut de = Deserializer::from_slice(&output.stdout);
let out = DiscocamlResponse::deserialize(EnumAsArray(&mut de))
.context("failed to parse response from discocaml")?;
de.end()
.context("failed to parse response from discocaml")?;
Ok(out)
}
pub async fn handle_command(
ctx: &Context,
config: &DiscocamlConfig,
_db: &SqlitePool,
command: &CommandInteraction,
) -> Result<()> {
// Check that the required role was present.
if let Err(err) = check_permissions(config, &command.member).await {
respond_with_error(ctx, command, &err).await;
return Err(err.context("permissions check failed"));
}
// Parse the expression out.
let mut expr = None;
for option in &command.data.options {
match (&option.name as &str, &option.value) {
("expr", CommandDataOptionValue::String(value)) => expr = Some(value),
_ => {
let err = anyhow!("unknown option {:?}", option);
respond_with_error(ctx, command, &err).await;
return Err(err);
}
}
}
let expr = if let Some(expr) = expr {
expr
} else {
let err = anyhow!("missing option {:?}", "expr");
respond_with_error(ctx, command, &err).await;
return Err(err);
};
// Round-trip the expression through discocaml.
let req = DiscocamlRequest {
expr: expr.to_string(),
command: DiscocamlCommand::Roundtrip,
};
let res = match run_discocaml(config, &req).await {
Ok(res) => res,
Err(err) => {
let err = err.context("failed to run discocaml");
respond_with_error(ctx, command, &err).await;
return Err(err);
}
};
let msg = CreateInteractionResponseMessage::new().content(format!("`{:?}`", res));
command
.create_response(&ctx, CreateInteractionResponse::Message(msg))
.await
.context("failed to respond")
}
|
