Add memory leak temporary mitigation (#42)

Cargo.lock

@@ -2672,7 +2672,7 @@ dependencies = [
 
 [[package]]
 name = "trust-graph-wasm"
-version = "0.3.0"
+version = "0.3.1"
 dependencies = [
  "anyhow",
  "bincode",

service/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "trust-graph-wasm"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["Fluence Labs"]
 edition = "2018"
 description = "trust graph wasm"

service/src/main.rs

@@ -13,10 +13,31 @@ mod results;
 mod service_api;
 mod storage_impl;
 mod tests;
+/*
+    _initialize function that calls __wasm_call_ctors is required to mitigade memory leak
+    that is described in https://github.com/WebAssembly/wasi-libc/issues/298
 
+    In short, without this code rust wraps every export function
+    with __wasm_call_ctors/__wasm_call_dtors calls. This causes memory leaks. When compiler sees
+    an explicit call to __wasm_call_ctors in _initialize function, it disables export wrapping.
+
+    TODO: remove when updating to marine-rs-sdk with fix
+ */
+extern "C" {
+    pub fn __wasm_call_ctors();
+}
+
+#[no_mangle]
+fn _initialize() {
+    unsafe {
+        __wasm_call_ctors();
+    }
+}
+//------------------------------
 pub static TRUSTED_TIMESTAMP: (&str, &str) = ("peer", "timestamp_sec");
 
 pub fn main() {
+    _initialize(); // As __wasm_call_ctors still does necessary work, we call it at the start of the module
     WasmLoggerBuilder::new()
         .with_log_level(log::LevelFilter::Trace)
         .build()