introduce echo-stepper

.gitignore

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+.idea/
+/target
+.repl_history

.repl_history

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+#V2
+interface
+call aquamarine invoke ["asd", ["a", "b"]]
+call aquamarine invoke ["asd", "a"]

Cargo.lock

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+# It is not intended for manual editing.
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Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "aquamarine"
+version = "0.1.0"
+authors = ["Fluence Labs"]
+edition = "2018"
+
+[[bin]]
+name = "aquamarine"
+path = "src/main.rs"
+
+[dependencies]
+fluence = { git = "https://github.com/fluencelabs/rust-sdk", features = ["logger"] }
+log = "0.4.11"

Config.toml

@@ -0,0 +1,6 @@
+modules_dir = "artifacts/"
+
+[[module]]
+    name = "aquamarine"
+    mem_pages_count = 100
+    logger_enabled = true

src/main.rs

@@ -0,0 +1,40 @@
+/*
+ * 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.
+ */
+
+use fluence::fce;
+use log::info;
+
+pub fn main() {
+    fluence::WasmLogger::init_with_level(log::Level::Info).unwrap();
+}
+
+#[fce]
+pub struct StepperOutcome {
+    pub aqua: String,
+    pub next_peer_pks: Vec<String>,
+}
+
+#[fce]
+pub fn invoke(init_user_id: String, aqua: String) -> StepperOutcome {
+    info!("stepper invoked with user_id = {}, aqua = {:?}", init_user_id, aqua);
+
+    let outcome = StepperOutcome {
+        aqua,
+        next_peer_pks: vec![init_user_id]
+    };
+
+    outcome
+}