create a MethodDispatcher that makes calls to other actors by method name

Author: alexytsu

fvm_dispatch/Cargo.toml

@@ -6,4 +6,6 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-fvm_sdk = { version = "1.0.0" }
+fvm_ipld_encoding = { version = "0.2.2" }
+fvm_sdk = { version = "1.0.0" }
+fvm_shared = { version = "0.8.0" }

fvm_dispatch/src/lib.rs

@@ -1,3 +1,5 @@
 pub mod hash;
+pub mod message;
+
 #[cfg(test)]
 mod tests {}

fvm_dispatch/src/message.rs

@@ -0,0 +1,29 @@
+use crate::hash::{Hasher, MethodHasher};
+
+use fvm_ipld_encoding::RawBytes;
+use fvm_sdk::{send, SyscallResult};
+use fvm_shared::{address::Address, econ::TokenAmount, receipt::Receipt};
+
+#[derive(Default)]
+pub struct MethodDispatcher<T: Hasher> {
+    method_hasher: MethodHasher<T>,
+}
+
+impl<T: Hasher> MethodDispatcher<T> {
+    pub fn new(hasher: T) -> Self {
+        Self {
+            method_hasher: MethodHasher::new(hasher),
+        }
+    }
+
+    pub fn call_method(
+        &self,
+        to: &Address,
+        method: &str,
+        params: RawBytes,
+        value: TokenAmount,
+    ) -> SyscallResult<Receipt> {
+        let method = self.method_hasher.method_number(method);
+        send::send(to, method, params, value)
+    }
+}