Contract compiled with Rust 1.70.0 not working

[think-in-universe]

Problem

After creating a new Rust contract with create-near-app with latest Rust version 1.70.0, and following the steps to deploy contract, developer failed to view function with near view <dev-account> get_greeting.

This issue is reported by developers in community who are learning how to build on NEAR today.

How to Reproduce

(1) Install the latest Rust version 1.70.0. For example,

stable-x86_64-unknown-linux-gnu (default)
rustc 1.70.0 (90c541806 2023-05-31)

(2) Create a new project with create-near-app command

npx create-near-app my-project --contract rust --frontend none --tests rust

(3) Deploy contract to testnet

cd ./my-project
npm i
npm run deploy

(4) View call function get_greeting

near view <dev-account> get_greeting

View call failed and you'll encounter the error as below.

$ near view dev-1685967486834-62115280035912 get_greeting
View call: dev-1685967486834-62115280035912.get_greeting()
An error occured
Error: Querying [object Object] failed: wasm execution failed with error: CompilationError(PrepareError(Deserialization)).
{
  "block_hash": "5cdGPvRvN8JGKs7AfEPjVJaoVZjhhS35H1WgxrvxmNXR",
  "block_height": 128323323,
  "error": "wasm execution failed with error: CompilationError(PrepareError(Deserialization))",
  "logs": []
}
    at JsonRpcProvider.query (/usr/local/share/nvm/versions/node/v19.9.0/lib/node_modules/near-cli/node_modules/near-api-js/lib/providers/json-rpc-provider.js:123:19)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async Account.viewFunction (/usr/local/share/nvm/versions/node/v19.9.0/lib/node_modules/near-cli/node_modules/near-api-js/lib/account.js:366:24)
    at async exports.callViewFunction (/usr/local/share/nvm/versions/node/v19.9.0/lib/node_modules/near-cli/index.js:103:48)
    at async Object.handler (/usr/local/share/nvm/versions/node/v19.9.0/lib/node_modules/near-cli/utils/exit-on-error.js:52:9)
TypedError: Querying [object Object] failed: wasm execution failed with error: CompilationError(PrepareError(Deserialization)).
{
  "block_hash": "5cdGPvRvN8JGKs7AfEPjVJaoVZjhhS35H1WgxrvxmNXR",
  "block_height": 128323323,
  "error": "wasm execution failed with error: CompilationError(PrepareError(Deserialization))",
  "logs": []
}
    at JsonRpcProvider.query (/usr/local/share/nvm/versions/node/v19.9.0/lib/node_modules/near-cli/node_modules/near-api-js/lib/providers/json-rpc-provider.js:123:19)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async Account.viewFunction (/usr/local/share/nvm/versions/node/v19.9.0/lib/node_modules/near-cli/node_modules/near-api-js/lib/account.js:366:24)
    at async exports.callViewFunction (/usr/local/share/nvm/versions/node/v19.9.0/lib/node_modules/near-cli/index.js:103:48)
    at async Object.handler (/usr/local/share/nvm/versions/node/v19.9.0/lib/node_modules/near-cli/utils/exit-on-error.js:52:9) {
  type: 'UntypedError',
  context: undefined
}

Notes

This is probably a compatibility issue of Rust SDK 4.0.0 with Rust 1.70.0.

[frol]

CompilationError(PrepareError

This usually indicates that the contract defined that it requires host functions that are not going to be provided or has illegal/unsupported operation. We will need to involve nearcore team to help to diagnose it.

P.S. Here are some relevant issues: near/nearcore#7223, near/nearcore#8502

[frol]

It has been already investigated: near/nearcore#9140 (comment)

Here is where solution is being discussed: https://near.zulipchat.com/#narrow/stream/295306-pagoda.2Fcontract-runtime/topic/sign-ext.20support.20and.20rust.201.2E70.2B

[jakmeier]

Unfortunately, without a protocol upgrade, the best workaround is to use rustc <=1.69.

See near/nearcore#9143

[agostbiro]

Hey, I've just ran into this.

I'm wondering if we should add a rust-toolchain.toml with the following content to the template to force using Rust 1.69:

[toolchain]
channel = "1.69"

Happy to provide a PR.

[frol]

@agostbiro let’s do what you suggested as a quick temporary fix