add FCE examples

url-downloader/curl_adapter/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "curl_adapter"
+version = "0.1.0"
+authors = ["Fluence Labs"]
+edition = "2018"
+publish = false
+
+[[bin]]
+path = "src/main.rs"
+name = "curl_adapter"
+
+[dependencies]
+fluence = { version = "=0.3.2", features = ["logger"] }
+log = "0.4.8"

url-downloader/curl_adapter/src/main.rs

@@ -0,0 +1,42 @@
+/*
+ * 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 fluence::MountedBinaryResult;
+
+/// Log level can be changed by `RUST_LOG` env as well.
+pub fn main() {
+    WasmLoggerBuilder::new().build().unwrap();
+}
+
+#[fce]
+pub fn download(url: String) -> String {
+    log::info!("get called with url {}", url);
+
+    let result = unsafe { curl(vec![url]) };
+    String::from_utf8(result.stdout).unwrap()
+}
+
+/// Permissions in `Config.toml` should exist to use host functions.
+#[fce]
+#[link(wasm_import_module = "host")]
+extern "C" {
+    fn curl(cmd: Vec<String>) -> MountedBinaryResult;
+}