add ability to use IT in host imports

crates/wit-generator/src/instructions_generator/foreign_mod_instructions.rs

@@ -26,8 +26,15 @@ use fluence_sdk_wit::ParsedType;
 use wasmer_wit::interpreter::Instruction;
 use crate::instructions_generator::utils::wtype_to_itype;
 
+const HOST_NAMESPACE_NAME: &str = "host";
+
 impl WITGenerator for AstExternModItem {
     fn generate_wit<'a>(&'a self, interfaces: &mut Interfaces<'a>) {
+        // host imports should be left as is
+        if self.namespace == HOST_NAMESPACE_NAME {
+            return;
+        }
+
         for import in &self.imports {
             generate_wit_for_import(import, &self.namespace, interfaces);
         }

examples/ipfs_node/wasm/ipfs_node/src/main.rs

@@ -39,7 +39,7 @@ pub fn put(file_path: String) -> String {
     let timeout = std::env::var(TIMEOUT_ENV_NAME).unwrap_or_else(|_| "1s".to_string());
     let cmd = format!("add --timeout {} -Q {}", timeout, file_path);
 
-    call_ipfs(cmd)
+    ipfs(cmd)
 }
 
 /// Get file by provided hash from IPFS, saves it to a temporary file and returns a path to it.
@@ -55,7 +55,7 @@ pub fn get(hash: String) -> String {
         timeout, result_file_path, hash
     );
 
-    call_ipfs(cmd);
+    ipfs(cmd);
 
     RESULT_FILE_PATH.to_string()
 }
@@ -71,22 +71,9 @@ pub fn get_address() -> String {
     }
 }
 
-fn call_ipfs(cmd: String) -> String {
-    unsafe {
-        // TODO: better error handling
-        match ipfs(cmd.as_ptr() as _, cmd.len() as _) {
-            0 => String::from_raw_parts(
-                fluence::internal::get_result_ptr() as _,
-                fluence::internal::get_result_size(),
-                fluence::internal::get_result_size(),
-            ),
-            _ => "host ipfs call failed".to_string(),
-        }
-    }
-}
-
+#[fce]
 #[link(wasm_import_module = "host")]
 extern "C" {
-    /// Put a file to ipfs, returns ipfs hash of the file.
-    fn ipfs(ptr: i32, size: i32) -> i32;
+    /// Execute provided cmd as a parameters of ipfs cli, return result.
+    pub fn ipfs(cmd: String) -> String;
 }

fluence-faas/src/misc/imports.rs

@@ -93,7 +93,7 @@ where
     };
 
     DynamicFunc::new(
-        std::sync::Arc::new(FuncSig::new(vec![Type::I32, Type::I32], vec![Type::I32])),
+        std::sync::Arc::new(FuncSig::new(vec![Type::I32, Type::I32], vec![])),
         func,
     )
 }