mirror of
https://github.com/fluencelabs/wasmer
synced 2025-06-20 20:26:32 +00:00
feat(runtime-c-api) Move the wasi module into its own file.
This commit is contained in:
Ivan Enderlin
@ -52,109 +52,7 @@ pub unsafe extern "C" fn wasmer_import_object_new() -> *mut wasmer_import_object
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}
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#[cfg(feature = "wasi")]
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mod wasi {
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use super::*;
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use crate::get_slice_checked;
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use std::path::PathBuf;
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/// Opens a directory that's visible to the WASI module as `alias` but
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/// is backed by the host file at `host_file_path`
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#[repr(C)]
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pub struct wasmer_wasi_map_dir_entry_t {
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/// What the WASI module will see in its virtual root
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pub alias: wasmer_byte_array,
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/// The backing file that the WASI module will interact with via the alias
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pub host_file_path: wasmer_byte_array,
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}
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impl wasmer_wasi_map_dir_entry_t {
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/// Converts the data into owned, Rust types
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pub unsafe fn as_tuple(&self) -> Result<(String, PathBuf), std::str::Utf8Error> {
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let alias = self.alias.as_str()?.to_owned();
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let host_path = std::path::PathBuf::from(self.host_file_path.as_str()?);
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Ok((alias, host_path))
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}
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}
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/// Creates a WASI import object.
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///
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/// This function treats null pointers as empty collections.
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/// For example, passing null for a string in `args`, will lead to a zero
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/// length argument in that position.
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#[no_mangle]
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pub unsafe extern "C" fn wasmer_wasi_generate_import_object(
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args: *const wasmer_byte_array,
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args_len: c_uint,
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envs: *const wasmer_byte_array,
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envs_len: c_uint,
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preopened_files: *const wasmer_byte_array,
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preopened_files_len: c_uint,
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mapped_dirs: *const wasmer_wasi_map_dir_entry_t,
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mapped_dirs_len: c_uint,
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) -> *mut wasmer_import_object_t {
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let arg_list = get_slice_checked(args, args_len as usize);
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let env_list = get_slice_checked(envs, envs_len as usize);
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let preopened_file_list = get_slice_checked(preopened_files, preopened_files_len as usize);
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let mapped_dir_list = get_slice_checked(mapped_dirs, mapped_dirs_len as usize);
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wasmer_wasi_generate_import_object_inner(
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arg_list,
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env_list,
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preopened_file_list,
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mapped_dir_list,
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)
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.unwrap_or(std::ptr::null_mut())
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}
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/// Inner function that wraps error handling
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fn wasmer_wasi_generate_import_object_inner(
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arg_list: &[wasmer_byte_array],
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env_list: &[wasmer_byte_array],
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preopened_file_list: &[wasmer_byte_array],
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mapped_dir_list: &[wasmer_wasi_map_dir_entry_t],
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) -> Result<*mut wasmer_import_object_t, std::str::Utf8Error> {
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let arg_vec = arg_list.iter().map(|arg| unsafe { arg.as_vec() }).collect();
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let env_vec = env_list
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.iter()
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.map(|env_var| unsafe { env_var.as_vec() })
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.collect();
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let po_file_vec = preopened_file_list
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.iter()
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.map(|po_file| Ok(unsafe { PathBuf::from(po_file.as_str()?) }.to_owned()))
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.collect::<Result<Vec<_>, _>>()?;
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let mapped_dir_vec = mapped_dir_list
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.iter()
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.map(|entry| unsafe { entry.as_tuple() })
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.collect::<Result<Vec<_>, _>>()?;
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let import_object = Box::new(wasmer_wasi::generate_import_object(
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arg_vec,
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env_vec,
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po_file_vec,
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mapped_dir_vec,
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));
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Ok(Box::into_raw(import_object) as *mut wasmer_import_object_t)
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}
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/// Convenience function that creates a WASI import object with no arguments,
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/// environment variables, preopened files, or mapped directories.
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///
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/// This function is the same as calling [`wasmer_wasi_generate_import_object`] with all
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/// empty values.
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#[no_mangle]
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pub unsafe extern "C" fn wasmer_wasi_generate_default_import_object(
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) -> *mut wasmer_import_object_t {
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let import_object = Box::new(wasmer_wasi::generate_import_object(
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vec![],
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vec![],
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vec![],
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vec![],
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));
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Box::into_raw(import_object) as *mut wasmer_import_object_t
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}
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}
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mod wasi;
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#[cfg(feature = "wasi")]
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pub use self::wasi::*;
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101
lib/runtime-c-api/src/import/wasi.rs
Normal file
101
lib/runtime-c-api/src/import/wasi.rs
Normal file
@ -0,0 +1,101 @@
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use super::*;
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use crate::get_slice_checked;
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use std::path::PathBuf;
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/// Opens a directory that's visible to the WASI module as `alias` but
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/// is backed by the host file at `host_file_path`
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#[repr(C)]
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pub struct wasmer_wasi_map_dir_entry_t {
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/// What the WASI module will see in its virtual root
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pub alias: wasmer_byte_array,
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/// The backing file that the WASI module will interact with via the alias
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pub host_file_path: wasmer_byte_array,
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}
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impl wasmer_wasi_map_dir_entry_t {
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/// Converts the data into owned, Rust types
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pub unsafe fn as_tuple(&self) -> Result<(String, PathBuf), std::str::Utf8Error> {
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let alias = self.alias.as_str()?.to_owned();
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let host_path = std::path::PathBuf::from(self.host_file_path.as_str()?);
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Ok((alias, host_path))
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}
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}
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/// Creates a WASI import object.
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///
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/// This function treats null pointers as empty collections.
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/// For example, passing null for a string in `args`, will lead to a zero
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/// length argument in that position.
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#[no_mangle]
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pub unsafe extern "C" fn wasmer_wasi_generate_import_object(
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args: *const wasmer_byte_array,
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args_len: c_uint,
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envs: *const wasmer_byte_array,
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envs_len: c_uint,
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preopened_files: *const wasmer_byte_array,
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preopened_files_len: c_uint,
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mapped_dirs: *const wasmer_wasi_map_dir_entry_t,
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mapped_dirs_len: c_uint,
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) -> *mut wasmer_import_object_t {
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let arg_list = get_slice_checked(args, args_len as usize);
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let env_list = get_slice_checked(envs, envs_len as usize);
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let preopened_file_list = get_slice_checked(preopened_files, preopened_files_len as usize);
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let mapped_dir_list = get_slice_checked(mapped_dirs, mapped_dirs_len as usize);
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wasmer_wasi_generate_import_object_inner(
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arg_list,
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env_list,
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preopened_file_list,
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mapped_dir_list,
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)
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.unwrap_or(std::ptr::null_mut())
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}
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/// Inner function that wraps error handling
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fn wasmer_wasi_generate_import_object_inner(
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arg_list: &[wasmer_byte_array],
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env_list: &[wasmer_byte_array],
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preopened_file_list: &[wasmer_byte_array],
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mapped_dir_list: &[wasmer_wasi_map_dir_entry_t],
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) -> Result<*mut wasmer_import_object_t, std::str::Utf8Error> {
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let arg_vec = arg_list.iter().map(|arg| unsafe { arg.as_vec() }).collect();
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let env_vec = env_list
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.iter()
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.map(|env_var| unsafe { env_var.as_vec() })
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.collect();
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let po_file_vec = preopened_file_list
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.iter()
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.map(|po_file| Ok(unsafe { PathBuf::from(po_file.as_str()?) }.to_owned()))
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.collect::<Result<Vec<_>, _>>()?;
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let mapped_dir_vec = mapped_dir_list
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.iter()
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.map(|entry| unsafe { entry.as_tuple() })
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.collect::<Result<Vec<_>, _>>()?;
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let import_object = Box::new(wasmer_wasi::generate_import_object(
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arg_vec,
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env_vec,
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po_file_vec,
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mapped_dir_vec,
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));
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Ok(Box::into_raw(import_object) as *mut wasmer_import_object_t)
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}
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/// Convenience function that creates a WASI import object with no arguments,
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/// environment variables, preopened files, or mapped directories.
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///
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/// This function is the same as calling [`wasmer_wasi_generate_import_object`] with all
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/// empty values.
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#[no_mangle]
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pub unsafe extern "C" fn wasmer_wasi_generate_default_import_object() -> *mut wasmer_import_object_t
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{
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let import_object = Box::new(wasmer_wasi::generate_import_object(
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vec![],
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vec![],
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vec![],
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vec![],
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));
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Box::into_raw(import_object) as *mut wasmer_import_object_t
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}
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