surrealdb_core/sql/statements/define/
function.rs

use crate::ctx::Context;
use crate::dbs::Options;
use crate::doc::CursorDoc;
use crate::err::Error;
use crate::iam::{Action, ResourceKind};
use crate::sql::statements::info::InfoStructure;
use crate::sql::{
	fmt::{is_pretty, pretty_indent},
	Base, Block, Ident, Kind, Object, Permission, Strand, Value,
};
use derive::Store;
use revision::revisioned;
use serde::{Deserialize, Serialize};
use std::fmt::{self, Display, Write};

#[revisioned(revision = 2)]
#[derive(Clone, Debug, Default, Eq, PartialEq, PartialOrd, Serialize, Deserialize, Store, Hash)]
#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
#[non_exhaustive]
pub struct DefineFunctionStatement {
	pub name: Ident,
	pub args: Vec<(Ident, Kind)>,
	pub block: Block,
	pub comment: Option<Strand>,
	pub permissions: Permission,
	#[revision(start = 2)]
	pub if_not_exists: bool,
}

impl DefineFunctionStatement {
	/// Process this type returning a computed simple Value
	pub(crate) async fn compute(
		&self,
		ctx: &Context<'_>,
		opt: &Options,
		_doc: Option<&CursorDoc<'_>>,
	) -> Result<Value, Error> {
		// Allowed to run?
		opt.is_allowed(Action::Edit, ResourceKind::Function, &Base::Db)?;
		// Claim transaction
		let mut run = ctx.tx_lock().await;
		// Clear the cache
		run.clear_cache();
		// Check if function already exists
		if run.get_db_function(opt.ns()?, opt.db()?, &self.name).await.is_ok() {
			if self.if_not_exists {
				return Ok(Value::None);
			} else {
				return Err(Error::FcAlreadyExists {
					value: self.name.to_string(),
				});
			}
		}
		// Process the statement
		let key = crate::key::database::fc::new(opt.ns()?, opt.db()?, &self.name);
		run.add_ns(opt.ns()?, opt.strict).await?;
		run.add_db(opt.ns()?, opt.db()?, opt.strict).await?;
		run.set(
			key,
			DefineFunctionStatement {
				// Don't persist the "IF NOT EXISTS" clause to schema
				if_not_exists: false,
				..self.clone()
			},
		)
		.await?;
		// Ok all good
		Ok(Value::None)
	}
}

impl fmt::Display for DefineFunctionStatement {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		write!(f, "DEFINE FUNCTION")?;
		if self.if_not_exists {
			write!(f, " IF NOT EXISTS")?
		}
		write!(f, " fn::{}(", self.name.0)?;
		for (i, (name, kind)) in self.args.iter().enumerate() {
			if i > 0 {
				f.write_str(", ")?;
			}
			write!(f, "${name}: {kind}")?;
		}
		f.write_str(") ")?;
		Display::fmt(&self.block, f)?;
		if let Some(ref v) = self.comment {
			write!(f, " COMMENT {v}")?
		}
		let _indent = if is_pretty() {
			Some(pretty_indent())
		} else {
			f.write_char(' ')?;
			None
		};
		write!(f, "PERMISSIONS {}", self.permissions)?;
		Ok(())
	}
}

impl InfoStructure for DefineFunctionStatement {
	fn structure(self) -> Value {
		let Self {
			name,
			args,
			block,
			comment,
			permissions,
			..
		} = self;
		let mut acc = Object::default();

		acc.insert("name".to_string(), name.structure());

		acc.insert(
			"args".to_string(),
			Value::Array(
				args.into_iter()
					.map(|(n, k)| Value::Array(vec![n.structure(), k.structure()].into()))
					.collect::<Vec<Value>>()
					.into(),
			),
		);

		acc.insert("block".to_string(), block.structure());

		acc.insert("permissions".to_string(), permissions.structure());

		if let Some(comment) = comment {
			acc.insert("comment".to_string(), comment.into());
		}

		Value::Object(acc)
	}
}
surrealdb_core/sql/statements/define/function.rs

surrealdb_core/sql/statements/define/
function.rs
