Revert "api: introduce RootContext::on_create_child_context() callback"

This reverts commit 5b0bbe5.

We revert this temporarily to allow for upstream patches to apply.

Author: unleashed

src/dispatcher.rs

@@ -95,37 +95,6 @@ impl Dispatcher {
         }
     }
 
-    /// Lets the root context to create its child context.
-    fn create_child_context(&self, context_id: u32, root_context_id: u32) -> bool {
-        if !self.roots.borrow().contains_key(&root_context_id) {
-            panic!("invalid root_context_id")
-        }
-        if let Some(child_context) = self
-            .roots
-            .borrow_mut()
-            .get_mut(&root_context_id)
-            .and_then(|root| root.on_create_child_context(context_id))
-        {
-            if match child_context {
-                ChildContext::HttpContext(http_context) => self
-                    .http_streams
-                    .borrow_mut()
-                    .insert(context_id, http_context)
-                    .is_some(),
-                ChildContext::StreamContext(stream_context) => self
-                    .streams
-                    .borrow_mut()
-                    .insert(context_id, stream_context)
-                    .is_some(),
-            } {
-                panic!("duplicate context_id")
-            }
-            true
-        } else {
-            false
-        }
-    }
-
     fn create_stream_context(&self, context_id: u32, root_context_id: u32) {
         if !self.roots.borrow().contains_key(&root_context_id) {
             panic!("invalid root_context_id")
@@ -176,8 +145,6 @@ impl Dispatcher {
     fn on_create_context(&self, context_id: u32, root_context_id: u32) {
         if root_context_id == 0 {
             self.create_root_context(context_id)
-        } else if self.create_child_context(context_id, root_context_id) {
-            // root context created a child context by himself
         } else if self.new_http_stream.get().is_some() {
             self.create_http_context(context_id, root_context_id);
         } else if self.new_stream.get().is_some() {

src/traits.rs

@@ -99,12 +99,6 @@ pub trait Context {
     }
 }
 
-/// Represents a child context of the root context.
-pub enum ChildContext {
-    StreamContext(Box<dyn StreamContext>),
-    HttpContext(Box<dyn HttpContext>),
-}
-
 pub trait RootContext: Context {
     fn on_vm_start(&mut self, _vm_configuration_size: usize) -> bool {
         true
@@ -127,12 +121,6 @@ pub trait RootContext: Context {
     fn on_queue_ready(&mut self, _queue_id: u32) {}
 
     fn on_log(&mut self) {}
-
-    fn on_create_child_context(&mut self, _context_id: u32) -> Option<ChildContext> {
-        // for the sake of compatibility with `set_http_context` and `set_stream_context` API,
-        // root context is not required to create its child context.
-        None
-    }
 }
 
 pub trait StreamContext: Context {