core: seams for parallel work: services.rs (boot), graph.rs (documents for /proc), activation.rs

cli/src/graph.rs

@@ -0,0 +1,31 @@
+//! The interface graph (PROTOCOL.md section 10.4): the `rpc.discover`
+//! documents of all plugins, their imports, and the result of each check.
+//!
+//! The `/proc` layer reads the files of `/proc/core/` through these
+//! functions. They must be cheap and must not block: they return cached data.
+use crate::Host;
+use serde_json::Value;
+
+// The /proc layer (T6) uses these functions. Remove this when it does.
+#[allow(dead_code)]
+impl Host {
+    /// The content of `/proc/core/graph.json`.
+    pub(crate) fn graph_json(&self) -> Vec<u8> {
+        b"{}\n".to_vec()
+    }
+
+    /// The content of `/proc/core/graph.dot`.
+    pub(crate) fn graph_dot(&self) -> Vec<u8> {
+        b"digraph plugins {}\n".to_vec()
+    }
+
+    /// The plugins that have an `rpc.discover` document, for `/proc/core/plugins/`.
+    pub(crate) fn discovered_plugins(&self) -> Vec<String> {
+        Vec::new()
+    }
+
+    /// The `rpc.discover` document of the current `plugin.wasm` of `plugin`.
+    pub(crate) fn discover_document(&self, _plugin: &str) -> Option<Value> {
+        None
+    }
+}