add FCE examples

ipfs-node/pure/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "ipfs-pure"
+version = "0.1.0"
+authors = ["Fluence Labs"]
+edition = "2018"
+publish = false
+
+[[bin]]
+name = "ipfs_pure"
+path = "src/main.rs"
+
+[dependencies]
+fluence = { version = "=0.3.2", features = ["logger"] }
+log = "0.4.11"

ipfs-node/pure/src/main.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.
+ */
+
+#![allow(improper_ctypes)]
+
+use fluence::fce;
+use fluence::WasmLoggerBuilder;
+
+use std::fs;
+use std::path::PathBuf;
+
+const RPC_TMP_FILEPATH: &str = "/tmp/ipfs_rpc_file";
+
+pub fn main() {
+    WasmLoggerBuilder::new()
+        .with_log_level(log::Level::Info)
+        .build()
+        .unwrap();
+}
+
+#[fce]
+pub fn invoke() -> String {
+    "IPFS_RPC wasm example, it allows to:\ninvoke\nput\nget".to_string()
+}
+
+#[fce]
+pub fn put(file_content: Vec<u8>) -> String {
+    log::info!("put called with {:?}", file_content);
+
+    let rpc_tmp_filepath = RPC_TMP_FILEPATH.to_string();
+
+    let r = fs::write(PathBuf::from(rpc_tmp_filepath.clone()), file_content);
+    if let Err(e) = r {
+        return format!("file can't be written: {}", e);
+    }
+
+    unsafe { ipfs_put(rpc_tmp_filepath) }
+}
+
+#[fce]
+pub fn get(hash: String) -> Vec<u8> {
+    log::info!("get called with hash: {}", hash);
+
+    let file_path = unsafe { ipfs_get(hash) };
+    fs::read(file_path).unwrap_or_else(|_| b"error while reading file".to_vec())
+}
+
+#[fce]
+#[link(wasm_import_module = "ipfs_effector")]
+extern "C" {
+    /// Put provided file to ipfs, return ipfs hash of the file.
+    #[link_name = "put"]
+    pub fn ipfs_put(file_path: String) -> String;
+
+    /// Get file from ipfs by hash.
+    #[link_name = "get"]
+    pub fn ipfs_get(hash: String) -> String;
+}