docs(network): remove protoc from prerequisites on papyrus readme (#492)

* docs(network): remove protoc installation from documentation

* build(protobuf): build proto files without protoc

Cargo.toml

@@ -157,6 +157,7 @@ prometheus-parse = "0.2.4"
 prost = "0.12.1"
 prost-build = "0.12.1"
 prost-types = "0.12.1"
+protoc-prebuilt = "0.3.0"
 pyo3 = "0.19.1"
 pyo3-log = "0.8.1"
 quote = "1.0.26"

crates/papyrus_protobuf/Cargo.toml

@@ -28,6 +28,7 @@ papyrus_test_utils.workspace = true
 
 [build-dependencies]
 prost-build.workspace = true
+protoc-prebuilt.workspace = true
 
 [package.metadata.cargo-machete]
 # The `rand` and `rand_chacha` crates are used in the `testing` feature, which is optional.

crates/papyrus_protobuf/build.rs

@@ -1,41 +1,20 @@
 use std::env;
-use std::io::{Error, ErrorKind, Result};
-use std::process::Command;
+use std::io::Result;
 
 fn main() -> Result<()> {
     println!("Building");
-    let protoc = env::var("PROTOC").unwrap_or("protoc".to_string());
-
-    let protoc_version = String::from_utf8_lossy(
-        &Command::new(protoc).arg("--version").output().expect("Protoc is not installed.").stdout,
-    )
-    .to_string();
-
-    let parts: Vec<&str> = protoc_version.split_whitespace().collect();
-    let protoc_version_str = parts.get(1).expect("Failed to determine protoc version");
-    let mut protoc_version_parts = protoc_version_str
-        .split('.')
-        .map(|part| part.parse::<u32>().expect("Error parsing protoc version"));
-    let major = protoc_version_parts.next().expect("Protoc version did not have a major number");
-    let minor = protoc_version_parts.next().unwrap_or_default();
-
-    if major < 3 || (major == 3 && minor < 15) {
-        Err(Error::new(
-            ErrorKind::Other,
-            "protoc version is too old. version 3.15.x or greater is needed.",
-        ))
-    } else {
-        prost_build::compile_protos(
-            &[
-                "src/proto/p2p/proto/class.proto",
-                "src/proto/p2p/proto/event.proto",
-                "src/proto/p2p/proto/header.proto",
-                "src/proto/p2p/proto/state.proto",
-                "src/proto/p2p/proto/transaction.proto",
-                "src/proto/p2p/proto/consensus.proto",
-            ],
-            &["src/proto/"],
-        )?;
-        Ok(())
-    }
+    let (protoc_bin, _) = protoc_prebuilt::init("27.0").unwrap();
+    env::set_var("PROTOC", protoc_bin);
+    prost_build::compile_protos(
+        &[
+            "src/proto/p2p/proto/class.proto",
+            "src/proto/p2p/proto/event.proto",
+            "src/proto/p2p/proto/header.proto",
+            "src/proto/p2p/proto/state.proto",
+            "src/proto/p2p/proto/transaction.proto",
+            "src/proto/p2p/proto/consensus.proto",
+        ],
+        &["src/proto/"],
+    )?;
+    Ok(())
 }

docs/papyrus/CONTRIBUTING.md

@@ -47,7 +47,6 @@ Then, you will need to install
 - [Ganache 7.4.3](https://www.npmjs.com/package/ganache)
   - You'll need to install 7.4.3 and not a version above it. We'll relax this in the future.
   - You'll need Ganache only for the tests of the [papyrus_base_layer](../../crates/papyrus_base_layer/) crate.
-- Protoc - follow the installation instructions in our [Prerequisites](../papyrus/README.adoc#Prerequisites).
 
 ### CI
 Your code will need to pass [CI](../.github/workflows/ci.yml) before it can be merged. This means your code will need to:

docs/papyrus/README.adoc

@@ -46,32 +46,6 @@ Use it at your own risk.
 
 * https://www.rust-lang.org/tools/install[Rust] must be installed. Minimum supported version is `1.76`.
 * You must have access to an Ethereum node. For example, you can use a node provider such as Infura.
-* link: https://grpc.io/docs/protoc-installation[Protoc]
-  - You'll need Protoc only for compiling the link:../crates/papyrus_network/[papyrus_network] crate.
-  - Make sure you have version 15 or higher installed. If not:
-    1. Remove your current Protoc installation:
-+
-[source,bash]
-----
-sudo apt remove protoc/protobuf-compiler
-----
-
-    2. Install version 15 or higher (replace DIR with your preferred installation directory):
-+
-[source,bash]
-----
-DIR="$HOME/.local"
-curl -L "https://github.com/protocolbuffers/protobuf/releases/download/v25.1/protoc-25.1-linux-x86_64.zip" -o protoc.zip
-unzip ./protoc.zip -d $DIR
-rm ./protoc.zip
-----
-
-    3. Add DIR to your PATH if it's not already there:
-+
-[source,bash]
-----
-export PATH=$PATH:$DIR/bin
-----
 
 [discrete]
 ==== Procedure