dbmcp_postgres/tools/
drop_database.rs

1//! MCP tool: `dropDatabase`.
2
3use std::borrow::Cow;
4
5use dbmcp_server::types::{DropDatabaseRequest, MessageResponse};
6use dbmcp_sql::Connection as _;
7use dbmcp_sql::SqlError;
8use rmcp::handler::server::router::tool::{AsyncTool, ToolBase};
9use rmcp::model::{ErrorData, ToolAnnotations};
10
11use crate::PostgresHandler;
12use crate::connection::quote_ident;
13
14/// Marker type for the `dropDatabase` MCP tool.
15pub(crate) struct DropDatabaseTool;
16
17impl DropDatabaseTool {
18    const NAME: &'static str = "dropDatabase";
19    const TITLE: &'static str = "Drop Database";
20    const DESCRIPTION: &'static str = include_str!("../../assets/tools/drop_database.md");
21}
22
23impl ToolBase for DropDatabaseTool {
24    type Parameter = DropDatabaseRequest;
25    type Output = MessageResponse;
26    type Error = ErrorData;
27
28    fn name() -> Cow<'static, str> {
29        Self::NAME.into()
30    }
31
32    fn title() -> Option<String> {
33        Some(Self::TITLE.into())
34    }
35
36    fn description() -> Option<Cow<'static, str>> {
37        Some(Self::DESCRIPTION.into())
38    }
39
40    fn annotations() -> Option<ToolAnnotations> {
41        Some(
42            ToolAnnotations::new()
43                .read_only(false)
44                .destructive(true)
45                .idempotent(false)
46                .open_world(false),
47        )
48    }
49}
50
51impl AsyncTool<PostgresHandler> for DropDatabaseTool {
52    async fn invoke(handler: &PostgresHandler, params: Self::Parameter) -> Result<Self::Output, Self::Error> {
53        handler.drop_database(params).await
54    }
55}
56
57impl PostgresHandler {
58    /// Drops an existing database.
59    ///
60    /// Refuses to drop the currently connected (default) database and
61    /// evicts the corresponding pool cache entry after a successful drop.
62    ///
63    /// # Errors
64    ///
65    /// Returns [`SqlError::ReadOnlyViolation`] in read-only mode,
66    /// [`SqlError::InvalidIdentifier`] for invalid names,
67    /// or [`SqlError::Query`] if the target is the active database
68    /// or the backend reports an error.
69    pub async fn drop_database(
70        &self,
71        DropDatabaseRequest { database }: DropDatabaseRequest,
72    ) -> Result<MessageResponse, ErrorData> {
73        if self.config.read_only {
74            return Err(SqlError::ReadOnlyViolation.into());
75        }
76
77        // Guard: prevent dropping the currently connected database.
78        if self.connection.default_database_name() == database.as_str() {
79            return Err(SqlError::Query(format!("Cannot drop the currently connected database '{database}'.")).into());
80        }
81
82        let drop_sql = format!("DROP DATABASE {}", quote_ident(&database));
83        self.connection.execute(drop_sql.as_str(), None).await?;
84
85        self.connection.invalidate(&database).await;
86
87        Ok(MessageResponse {
88            message: format!("Database '{database}' dropped successfully."),
89        })
90    }
91}
dbmcp_postgres/tools/drop_database.rs

dbmcp_postgres/tools/
drop_database.rs
