File size: 5,435 Bytes
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use std::sync::Arc;
use anyhow::Context;
use anyhow::Result;
use anyhow::anyhow;
use rmcp::model::ListResourceTemplatesResult;
use rmcp::model::ListResourcesResult;
use rmcp::model::PaginatedRequestParams;
use rmcp::model::ReadResourceRequestParams;
use rmcp::model::ReadResourceResult;
use rmcp::model::Resource;
use rmcp::model::ResourceTemplate;
use tokio::task::JoinSet;
use tracing::warn;
use crate::pagination::collect_paginated;
use crate::rmcp_client::ManagedClient;
/// The ready clients captured for one model step.
pub(crate) struct McpBindingClients {
clients: HashMap<String, Arc<ManagedClient>>,
}
impl McpBindingClients {
pub(crate) fn new(clients: HashMap<String, Arc<ManagedClient>>) -> Self {
Self { clients }
}
pub(crate) fn client(&self, server: &str) -> Option<Arc<ManagedClient>> {
self.clients.get(server).cloned()
}
pub(crate) async fn list_resources(
&self,
server: &str,
params: Option<PaginatedRequestParams>,
) -> Result<ListResourcesResult> {
let managed = self
.client(server)
.ok_or_else(|| anyhow!("MCP server '{server}' was not ready for this step"))?;
managed
.client
.list_resources(params, managed.tool_timeout)
.await
.with_context(|| format!("resources/list failed for `{server}`"))
}
pub(crate) async fn list_resource_templates(
&self,
server: &str,
params: Option<PaginatedRequestParams>,
) -> Result<ListResourceTemplatesResult> {
let managed = self
.client(server)
.ok_or_else(|| anyhow!("MCP server '{server}' was not ready for this step"))?;
managed
.client
.list_resource_templates(params, managed.tool_timeout)
.await
.with_context(|| format!("resources/templates/list failed for `{server}`"))
}
pub(crate) async fn read_resource(
&self,
server: &str,
params: ReadResourceRequestParams,
) -> Result<ReadResourceResult> {
let managed = self
.client(server)
.ok_or_else(|| anyhow!("MCP server '{server}' was not ready for this step"))?;
let uri = params.uri.clone();
managed
.client
.read_resource(params, managed.tool_timeout)
.await
.with_context(|| format!("resources/read failed for `{server}` ({uri})"))
}
pub(crate) async fn list_all_resources(
&self,
include_server: impl Fn(&str) -> bool,
) -> HashMap<String, Vec<Resource>> {
let mut join_set = JoinSet::new();
for (server_name, managed) in self
.clients
.iter()
.filter(|(server_name, _)| include_server(server_name))
{
let server_name = server_name.clone();
let client = Arc::clone(&managed.client);
let timeout = managed.tool_timeout;
join_set.spawn(async move {
let resources = collect_paginated("resources/list", timeout, |params| {
let client = Arc::clone(&client);
async move {
let response = client.list_resources(params, timeout).await?;
Ok((response.resources, response.next_cursor))
}
})
.await;
(server_name, resources)
});
}
collect_resource_results(&mut join_set, "resources").await
}
pub(crate) async fn list_all_resource_templates(
&self,
include_server: impl Fn(&str) -> bool,
) -> HashMap<String, Vec<ResourceTemplate>> {
let mut join_set = JoinSet::new();
for (server_name, managed) in self
.clients
.iter()
.filter(|(server_name, _)| include_server(server_name))
{
let server_name = server_name.clone();
let client = Arc::clone(&managed.client);
let timeout = managed.tool_timeout;
join_set.spawn(async move {
let templates = collect_paginated("resources/templates/list", timeout, |params| {
let client = Arc::clone(&client);
async move {
let response = client.list_resource_templates(params, timeout).await?;
Ok((response.resource_templates, response.next_cursor))
}
})
.await;
(server_name, templates)
});
}
collect_resource_results(&mut join_set, "resource templates").await
}
}
async fn collect_resource_results<T: Send + 'static>(
join_set: &mut JoinSet<(String, Result<Vec<T>>)>,
kind: &str,
) -> HashMap<String, Vec<T>> {
let mut resources = HashMap::new();
while let Some(result) = join_set.join_next().await {
match result {
Ok((server, Ok(server_resources))) => {
resources.insert(server, server_resources);
}
Ok((server, Err(error))) => {
warn!("Failed to list {kind} for MCP server '{server}': {error:#}");
}
Err(error) => {
warn!("Task panic when listing {kind} for MCP server: {error:#}");
}
}
}
resources
}
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