improve export function search from host import

examples/ipfs_node/Config.toml

@@ -5,7 +5,7 @@
 
     [core_module.imports]
     mysql = "/usr/bin/mysql"
-    ipfs = "/usr/bin/ipfs"
+    ipfs = "/usr/local/bin/ipfs"
 
     [core_module.wasi]
     envs = ["asdsad=sdaasd"]

examples/ipfs_node/src/imports.rs

@@ -16,6 +16,18 @@
 
 use wasmer_core::vm::Ctx;
 use wasmer_core::typed_func::DynamicFunc;
+use wasmer_core::typed_func::WasmTypeList;
+use wasmer_core::types::Value;
+use wasmer_core::types::Type;
+use wasmer_core::types::FuncSig;
+use wasmer_runtime::Func;
+use wasmer_runtime::error::ResolveError;
+use wasmer_core::backend::SigRegistry;
+use wasmer_runtime::types::LocalOrImport;
+use wasmer_core::module::ExportIndex;
+use wasmer_core::structures::TypedIndex;
+
+const ALLOCATE_FUNC_NAME: &'static str = "allocate";
 
 pub(super) fn log_utf8_string(ctx: &mut Ctx, offset: i32, size: i32) {
     use wasmer_core::memory::ptr::{Array, WasmPtr};
@@ -27,10 +39,80 @@ pub(super) fn log_utf8_string(ctx: &mut Ctx, offset: i32, size: i32) {
     }
 }
 
-pub(super) fn create_host_import_func(_host_cmd: String) -> DynamicFunc<'static> {
-    use wasmer_core::types::Value;
-    use wasmer_core::types::Type;
-    use wasmer_core::types::FuncSig;
+// rewrited from Wasmer: https://github.com/wasmerio/wasmer/blob/081f6250e69b98b9f95a8f62ad6d8386534f3279/lib/runtime-core/src/instance.rs#L863
+unsafe fn get_export_func_by_name<'a, Args, Rets>(
+    ctx: &'a mut Ctx,
+    name: &str,
+) -> Result<Func<'a, Args, Rets>, ResolveError>
+where
+    Args: WasmTypeList,
+    Rets: WasmTypeList,
+{
+    let module_inner = &(*ctx.module);
+
+    let export_index =
+        module_inner
+            .info
+            .exports
+            .get(name)
+            .ok_or_else(|| ResolveError::ExportNotFound {
+                name: name.to_string(),
+            })?;
+
+    let export_func_index = match export_index {
+        ExportIndex::Func(func_index) => func_index,
+        _ => {
+            return Err(ResolveError::ExportWrongType {
+                name: name.to_string(),
+            })
+        }
+    };
+
+    let export_func_signature_idx = *module_inner
+        .info
+        .func_assoc
+        .get(*export_func_index)
+        .expect("broken invariant, incorrect func index");
+
+    let export_func_signature = &module_inner.info.signatures[export_func_signature_idx];
+    let export_func_signature_ref = SigRegistry.lookup_signature_ref(export_func_signature);
+
+    if export_func_signature_ref.params() != Args::types()
+        || export_func_signature_ref.returns() != Rets::types()
+    {
+        return Err(ResolveError::Signature {
+            expected: (*export_func_signature).clone(),
+            found: Args::types().to_vec(),
+        });
+    }
+
+    let func_wasm_inner = module_inner
+        .runnable_module
+        .get_trampoline(&module_inner.info, export_func_signature_idx)
+        .unwrap();
+
+    let export_func_ptr = match export_func_index.local_or_import(&module_inner.info) {
+        LocalOrImport::Local(local_func_index) => module_inner
+            .runnable_module
+            .get_func(&module_inner.info, local_func_index)
+            .unwrap(),
+        _ => {
+            return Err(ResolveError::ExportNotFound {
+                name: name.to_string(),
+            })
+        }
+    };
+
+    let typed_func: Func<Args, Rets, wasmer_core::typed_func::Wasm> =
+        Func::from_raw_parts(func_wasm_inner, export_func_ptr, None, ctx as _);
+
+    Ok(typed_func)
+}
+
+pub(super) fn create_host_import_func(host_cmd: String) -> DynamicFunc<'static> {
+    let allocate_func: Option<Func<'static, i32, i32>> = None;
+    let set_result_ptr: Option<Func<'static, i32, ()>> = None;
+    let set_result_size: Option<Func<'static, i32, ()>> = None;
 
     let func = move |ctx: &mut Ctx, inputs: &[Value]| -> Vec<Value> {
         use wasmer_core::memory::ptr::{Array, WasmPtr};
@@ -38,17 +120,58 @@ pub(super) fn create_host_import_func(_host_cmd: String) -> DynamicFunc<'static>
         println!("inputs size is {}", inputs.len());
 
         // TODO: refactor this
-        let array_ptr = inputs[1].to_u128() as i32;
-        let array_size = inputs[0].to_u128() as i32;
+        let array_ptr = inputs[0].to_u128() as i32;
+        let array_size = inputs[1].to_u128() as i32;
         println!("ptr is {}, size is {}", array_ptr, array_size);
 
         let wasm_ptr = WasmPtr::<u8, Array>::new(array_ptr as _);
-        match wasm_ptr.get_utf8_string(ctx.memory(0), array_size as _) {
-            Some(msg) => print!("{}", msg),
-            None => println!("callback: incorrect UTF8 string's been supplied to logger"),
+        let result = match wasm_ptr.get_utf8_string(ctx.memory(0), array_size as _) {
+            Some(arg_value) => {
+                let output = std::process::Command::new(host_cmd.clone())
+                    .arg(arg_value)
+                    .output()
+                    .unwrap();
+                output.stdout
+            }
+            None => b"host callback: incorrect UTF8 string's been supplied to import".to_vec(),
+        };
+
+        println!("from host import function: result is {:?}", result);
+
+        unsafe {
+            if let mut allocate_func = None {
+                let func = match get_export_func_by_name::<i32, i32>(ctx, ALLOCATE_FUNC_NAME) {
+                    Ok(func) => func,
+                    Err(_) => return vec![Value::I32(0)],
+                };
+                allocate_func = Some(func);
             }
 
-        vec![Value::I32(0x1337)]
+            if let mut set_result_ptr = None {
+                let func = match get_export_func_by_name::<i32, ()>(ctx, ALLOCATE_FUNC_NAME) {
+                    Ok(func) => func,
+                    Err(_) => return vec![Value::I32(0)],
+                };
+                set_result_ptr = Some(func);
+            }
+
+            if let mut set_result_size = None {
+                let func = match get_export_func_by_name::<i32, ()>(ctx, ALLOCATE_FUNC_NAME) {
+                    Ok(func) => func,
+                    Err(_) => return vec![Value::I32(0)],
+                };
+                set_result_size = Some(func);
+            }
+            let mem_address = allocate_func
+                .clone()
+                .unwrap()
+                .call(result.len() as i32)
+                .unwrap();
+            let _ = set_result_ptr.clone().unwrap().call(mem_address as i32);
+            let _ = set_result_size.clone().unwrap().call(result.len() as i32);
+
+            vec![Value::I32(1)]
+        }
     };
 
     DynamicFunc::new(

examples/ipfs_node/wasm/ipfs_node/src/lib.rs

@@ -21,28 +21,34 @@ mod result;
 
 use crate::result::{RESULT_PTR, RESULT_SIZE};
 
-#[no_mangle]
-pub unsafe fn put(file_content_ptr: *mut u8, file_content_size: usize) {
-    let file_content =
-        String::from_raw_parts(file_content_ptr, file_content_size, file_content_size);
+const RESULT_PATH: &str = "/tmp/ipfs_rpc_file";
 
-    let msg = format!(
-        "from Wasm ipfs_node.get: file content is {}\n",
-        file_content
-    );
+#[no_mangle]
+pub unsafe fn put(file_path_ptr: *mut u8, file_path_size: usize) {
+    let file_path = String::from_raw_parts(file_path_ptr, file_path_size, file_path_size);
+
+    let msg = format!("from Wasm ipfs_node.put: file path is {}\n", file_path);
     log_utf8_string(msg.as_ptr() as _, msg.len() as _);
 
-    let cmd = format!("put {}", file_content);
-    let ipfs_result = ipfs(cmd.as_ptr() as _, cmd.len() as _);
+    let cmd = format!("add -Q {}", file_path);
+    let result = ipfs(cmd.as_ptr() as _, cmd.len() as _);
 
-    let after_ipfs = format!("after ipfs call: {} \n", ipfs_result);
-    log_utf8_string(after_ipfs.as_ptr() as _, after_ipfs.len() as _);
+    let hash = if result {
+        String::from_raw_parts(
+            *RESULT_PTR.get_mut() as _,
+            *RESULT_SIZE.get_mut(),
+            *RESULT_SIZE.get_mut(),
+        )
+    } else {
+        "host ipfs call failed".to_string()
+    };
 
-    let result = "IPFS node: hash is asdasdsad".to_string();
+    let msg = format!("from Wasm ipfs_node.put: file add wtih hash is {} \n", hash);
+    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
 
-    *RESULT_PTR.get_mut() = result.as_ptr() as _;
-    *RESULT_SIZE.get_mut() = result.len();
-    std::mem::forget(result);
+    *RESULT_PTR.get_mut() = hash.as_ptr() as _;
+    *RESULT_SIZE.get_mut() = hash.len();
+    std::mem::forget(hash);
 }
 
 #[no_mangle]
@@ -52,14 +58,24 @@ pub unsafe fn get(hash_ptr: *mut u8, hash_size: usize) {
     let msg = format!("from Wasm ipfs_node.get: file hash is {}\n", hash);
     log_utf8_string(msg.as_ptr() as _, msg.len() as _);
 
-    let cmd = format!("get {}", hash);
-    ipfs(cmd.as_ptr() as _, cmd.len() as _);
+    let cmd = format!("get -o {}  {}", RESULT_PATH, hash);
+    let _result = ipfs(cmd.as_ptr() as _, cmd.len() as _);
 
-    let result = "IPFS node: file is hhhhaaa".to_string();
+    let _output = String::from_raw_parts(
+        *RESULT_PTR.get_mut() as _,
+        *RESULT_SIZE.get_mut(),
+        *RESULT_SIZE.get_mut(),
+    );
 
-    *RESULT_PTR.get_mut() = result.as_ptr() as _;
-    *RESULT_SIZE.get_mut() = result.len();
-    std::mem::forget(result);
+    // TODO: check output
+
+    let file_path = RESULT_PATH.to_string();
+    let msg = format!("from Wasm ipfs_node.get: file path is {}", file_path);
+    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+
+    *RESULT_PTR.get_mut() = file_path.as_ptr() as _;
+    *RESULT_SIZE.get_mut() = file_path.len();
+    std::mem::forget(file_path);
 }
 
 #[link(wasm_import_module = "host")]

examples/ipfs_node/wasm/ipfs_rpc/src/lib.rs

@@ -22,31 +22,6 @@ use crate::result::{RESULT_PTR, RESULT_SIZE};
 use std::fs;
 use std::path::PathBuf;
 
-#[no_mangle]
-pub unsafe fn get(hash_ptr: *mut u8, hash_size: usize) {
-    let hash = String::from_raw_parts(hash_ptr, hash_size, hash_size);
-
-    let msg = format!("from Wasm rpc: getting file with hash {}\n", hash);
-    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
-
-    ipfs_get(hash.as_ptr() as _, hash.len() as _);
-
-    let file_path = String::from_raw_parts(
-        *RESULT_PTR.get_mut() as _,
-        *RESULT_SIZE.get_mut(),
-        *RESULT_SIZE.get_mut(),
-    );
-
-    let msg = format!("from Wasm rpc: reading file from {}\n", file_path);
-    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
-
-    let file_content = fs::read(file_path).unwrap_or_else(|_| b"error while reading file".to_vec());
-
-    *RESULT_PTR.get_mut() = file_content.as_ptr() as _;
-    *RESULT_SIZE.get_mut() = file_content.len();
-    std::mem::forget(file_content);
-}
-
 #[no_mangle]
 pub unsafe fn put(file_content_ptr: *mut u8, file_content_size: usize) {
     let file_content =
@@ -76,6 +51,31 @@ pub unsafe fn put(file_content_ptr: *mut u8, file_content_size: usize) {
     std::mem::forget(hash);
 }
 
+#[no_mangle]
+pub unsafe fn get(hash_ptr: *mut u8, hash_size: usize) {
+    let hash = String::from_raw_parts(hash_ptr, hash_size, hash_size);
+
+    let msg = format!("from Wasm rpc: getting file with hash {}\n", hash);
+    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+
+    ipfs_get(hash.as_ptr() as _, hash.len() as _);
+
+    let file_path = String::from_raw_parts(
+        *RESULT_PTR.get_mut() as _,
+        *RESULT_SIZE.get_mut(),
+        *RESULT_SIZE.get_mut(),
+    );
+
+    let msg = format!("from Wasm rpc: reading file from {}\n", file_path);
+    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+
+    let file_content = fs::read(file_path).unwrap_or_else(|_| b"error while reading file".to_vec());
+
+    *RESULT_PTR.get_mut() = file_content.as_ptr() as _;
+    *RESULT_SIZE.get_mut() = file_content.len();
+    std::mem::forget(file_content);
+}
+
 #[link(wasm_import_module = "host")]
 extern "C" {
     /// Writes a byte string of size bytes that starts from ptr to a logger.