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

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/*
* Copyright 2020 Fluence Labs Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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#![allow(clippy::missing_safety_doc)]
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mod mem;
mod result;
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use crate::result::{RESULT_PTR, RESULT_SIZE};
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const RESULT_PATH: &str = "/tmp/ipfs_rpc_file";
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#[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);
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let msg = format!("ipfs_node.put: file path is {}\n", file_path);
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log_utf8_string(msg.as_ptr() as _, msg.len() as _);
let cmd = format!("add -Q {}", file_path);
let result = ipfs(cmd.as_ptr() as _, cmd.len() as _);
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let hash = if result == 1 {
String::from_raw_parts(
*RESULT_PTR.get_mut() as _,
*RESULT_SIZE.get_mut(),
*RESULT_SIZE.get_mut(),
)
} else {
"host ipfs call failed".to_string()
};
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let msg = format!("ipfs_node.put: file add wtih hash is {} \n", hash);
log_utf8_string(msg.as_ptr() as _, msg.len() as _);
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*RESULT_PTR.get_mut() = hash.as_ptr() as _;
*RESULT_SIZE.get_mut() = hash.len();
std::mem::forget(hash);
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}
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#[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);
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let msg = format!("ipfs_node.get: file hash is {}\n", hash);
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log_utf8_string(msg.as_ptr() as _, msg.len() as _);
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let cmd = format!("get -o {} {}", RESULT_PATH, hash);
let _result = ipfs(cmd.as_ptr() as _, cmd.len() as _);
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let _output = String::from_raw_parts(
*RESULT_PTR.get_mut() as _,
*RESULT_SIZE.get_mut(),
*RESULT_SIZE.get_mut(),
);
// TODO: check output
let file_path = RESULT_PATH.to_string();
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let msg = format!("ipfs_node.get: file path is {}", file_path);
log_utf8_string(msg.as_ptr() as _, msg.len() as _);
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*RESULT_PTR.get_mut() = file_path.as_ptr() as _;
*RESULT_SIZE.get_mut() = file_path.len();
std::mem::forget(file_path);
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}
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#[link(wasm_import_module = "host")]
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extern "C" {
/// Writes a byte string of size bytes that starts from ptr to a logger.
fn log_utf8_string(ptr: i32, size: i32);
/// Put a file to ipfs, returns ipfs hash of the file.
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fn ipfs(ptr: i32, size: i32) -> i32;
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}