From aa72fdab644c265d1a72e6ef2658c2b64194707b Mon Sep 17 00:00:00 2001
From: Valery Antopol <valery.antopol@gmail.com>
Date: Tue, 28 Jun 2022 18:40:19 +0300
Subject: [PATCH] Add memory leak temporary mitigation (#42)

---
 Cargo.lock          |  2 +-
 example/index.ts    |  8 ++++----
 service/Cargo.toml  |  2 +-
 service/src/main.rs | 21 +++++++++++++++++++++
 4 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index c8e204e..0fe71dd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2672,7 +2672,7 @@ dependencies = [
 
 [[package]]
 name = "trust-graph-wasm"
-version = "0.3.0"
+version = "0.3.1"
 dependencies = [
  "anyhow",
  "bincode",
diff --git a/example/index.ts b/example/index.ts
index 085dd69..ffa3a61 100644
--- a/example/index.ts
+++ b/example/index.ts
@@ -14,10 +14,10 @@
  * limitations under the License.
  */
 
-import {trusted_computation} from "./generated/computation";
+import { trusted_computation } from "./generated/computation";
 import * as tg from "./generated/export";
-import {Fluence, FluencePeer, KeyPair} from "@fluencelabs/fluence";
-import {krasnodar, Node, testNet, stage} from "@fluencelabs/fluence-network-environment";
+import { Fluence, FluencePeer, KeyPair } from "@fluencelabs/fluence";
+import { krasnodar, Node, testNet, stage } from "@fluencelabs/fluence-network-environment";
 import assert from "assert";
 const bs58 = require('bs58');
 
@@ -92,7 +92,7 @@ async function main() {
     let builtins_keypair = await KeyPair.fromEd25519SK(sk);
 
     let relay = local[0];
-    await Fluence.start({ connectTo: relay, KeyPair: builtins_keypair});
+    await Fluence.start({ connectTo: relay, KeyPair: builtins_keypair });
     console.log(
         "📗 created a fluence peer %s with relay %s",
         Fluence.getStatus().peerId,
diff --git a/service/Cargo.toml b/service/Cargo.toml
index 3413fda..0f65c41 100644
--- a/service/Cargo.toml
+++ b/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"
diff --git a/service/src/main.rs b/service/src/main.rs
index d4e2c57..cdce3e8 100644
--- a/service/src/main.rs
+++ b/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()