[pitboss] phase 21: Track M.3 — ScheduledJob + GraphQLResolver + WebSocket + Middleware + Migration

src/dynamic/framework/adapters/websocket_channels.rs

@@ -0,0 +1,112 @@
+//! Phase 21 (Track M.3) — Django Channels WebSocket adapter (Python).
+//!
+//! Fires when the surrounding source imports Django Channels
+//! (`channels.generic.websocket`, `AsyncWebsocketConsumer`) and the
+//! function body sits inside a `WebsocketConsumer` subclass.
+
+use crate::dynamic::framework::{FrameworkAdapter, FrameworkBinding};
+use crate::evidence::EntryKind;
+use crate::summary::FuncSummary;
+use crate::symbol::Lang;
+
+pub struct WebsocketChannelsAdapter;
+
+const ADAPTER_NAME: &str = "websocket-channels";
+
+fn callee_is_channels(name: &str) -> bool {
+    let last = name.rsplit_once('.').map(|(_, s)| s).unwrap_or(name);
+    matches!(
+        last,
+        "receive" | "receive_json" | "connect" | "disconnect" | "send" | "send_json"
+    )
+}
+
+fn source_imports_channels(file_bytes: &[u8]) -> bool {
+    const NEEDLES: &[&[u8]] = &[
+        b"channels.generic.websocket",
+        b"WebsocketConsumer",
+        b"AsyncWebsocketConsumer",
+        b"JsonWebsocketConsumer",
+        b"AsyncJsonWebsocketConsumer",
+        b"from channels",
+    ];
+    NEEDLES
+        .iter()
+        .any(|n| file_bytes.windows(n.len()).any(|w| w == *n))
+}
+
+fn extract_path(file_bytes: &[u8]) -> String {
+    let text = std::str::from_utf8(file_bytes).unwrap_or("");
+    for needle in ["re_path(r'", "re_path('", "path('", "path(\""] {
+        if let Some(idx) = text.find(needle) {
+            let after = &text[idx + needle.len()..];
+            let close: &[char] = &['\'', '"'];
+            if let Some(end) = after.find(|c: char| close.contains(&c)) {
+                return after[..end].to_owned();
+            }
+        }
+    }
+    "/ws/".to_owned()
+}
+
+impl FrameworkAdapter for WebsocketChannelsAdapter {
+    fn name(&self) -> &'static str {
+        ADAPTER_NAME
+    }
+
+    fn lang(&self) -> Lang {
+        Lang::Python
+    }
+
+    fn detect(
+        &self,
+        summary: &FuncSummary,
+        _ast: tree_sitter::Node<'_>,
+        file_bytes: &[u8],
+    ) -> Option<FrameworkBinding> {
+        let matches_call = super::any_callee_matches(summary, callee_is_channels);
+        let matches_source = source_imports_channels(file_bytes);
+        if matches_call || matches_source {
+            Some(FrameworkBinding {
+                adapter: ADAPTER_NAME.to_owned(),
+                kind: EntryKind::WebSocket {
+                    path: extract_path(file_bytes),
+                },
+                route: None,
+                request_params: Vec::new(),
+                response_writer: None,
+                middleware: Vec::new(),
+            })
+        } else {
+            None
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn parse_python(src: &[u8]) -> tree_sitter::Tree {
+        let mut parser = tree_sitter::Parser::new();
+        let lang = tree_sitter::Language::from(tree_sitter_python::LANGUAGE);
+        parser.set_language(&lang).unwrap();
+        parser.parse(src, None).unwrap()
+    }
+
+    #[test]
+    fn fires_on_channels_consumer() {
+        let src: &[u8] = b"from channels.generic.websocket import WebsocketConsumer\n\
+            class ChatConsumer(WebsocketConsumer):\n    def receive(self, text_data=None, bytes_data=None):\n        pass\n";
+        let tree = parse_python(src);
+        let summary = FuncSummary {
+            name: "receive".into(),
+            ..Default::default()
+        };
+        let binding = WebsocketChannelsAdapter
+            .detect(&summary, tree.root_node(), src)
+            .expect("channels binds");
+        assert_eq!(binding.adapter, "websocket-channels");
+        assert!(matches!(binding.kind, EntryKind::WebSocket { .. }));
+    }
+}