add ifs and utility services

aqua-examples/decentralized-blockchain-gateway/wasm-modules/utilities/Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "utilities"
+version = "0.1.0"
+authors = ["boneyard93501 <4523011+boneyard93501@users.noreply.github.com>"]
+edition = "2018"
+description = "utilities, a Marine wasi module"
+license = "Apache-2.0"
+
+[[bin]]
+name = "utilities"
+path = "src/main.rs"
+
+[dependencies]
+marine-rs-sdk = { version = "0.6.15", features = ["logger"] }
+log = "0.4.14"
+serde_json = "1.0.81"
+serde = "1.0.137"
+streaming-stats = "0.2.3"
+
+[dev-dependencies]
+marine-rs-sdk-test = "0.6.0"
+
+[dev]
+[profile.release]
+opt-level = "s"

aqua-examples/decentralized-blockchain-gateway/wasm-modules/utilities/src/main.rs

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+/*
+ * Copyright 2022 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 marine_rs_sdk::{marine, module_manifest};
+use serde_json;
+
+module_manifest!();
+
+fn main() {}
+
+#[marine]
+fn kv_to_u64(kv_string: String, k: String) -> u64 {
+    let obj: serde_json::Value = serde_json::from_str(&kv_string).unwrap();
+    obj[&k].as_u64().unwrap()
+}