chore(target_chains/starknet): add a tool for generating test VAA data (#1561)

.github/workflows/ci-starknet-tools.yml

@@ -0,0 +1,25 @@
+name: Check Starknet Tools
+
+on:
+  pull_request:
+    paths: [target_chains/starknet/tools/**]
+  push:
+    branches: [main]
+    paths: [target_chains/starknet/tools/**]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: 1.78.0
+          components: rustfmt, clippy
+          override: true
+      - name: Check formatting
+        run: cargo fmt --manifest-path ./target_chains/starknet/tools/test_vaas/Cargo.toml -- --check
+      - name: Run clippy
+        run: cargo clippy --manifest-path ./target_chains/starknet/tools/test_vaas/Cargo.toml --all-targets -- --deny warnings
+      - name: Run wormhole_mainnet_upgrades binary
+        run: cargo run --manifest-path ./target_chains/starknet/tools/test_vaas/Cargo.toml --bin wormhole_mainnet_upgrades

target_chains/starknet/tools/test_vaas/Cargo.lock

@@ -0,0 +1,367 @@
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+dependencies = [
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+]

target_chains/starknet/tools/test_vaas/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "test_vaas"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+hex = "0.4.3"
+primitive-types = "0.12.2"

target_chains/starknet/tools/test_vaas/rust-toolchain

@@ -0,0 +1 @@
+1.78.0

target_chains/starknet/tools/test_vaas/src/lib.rs

@@ -0,0 +1,58 @@
+use primitive_types::U256;
+
+/// A data format compatible with `pyth::byte_array::ByteArray`.
+struct CairoByteArrayData {
+    // Number of bytes stored in the last item of `self.data` (or 0 if it's empty).
+    num_last_bytes: usize,
+    // Bytes in big endian. Each item except the last one stores 31 bytes.
+    // If `num_last_bytes < 31`, unused most significant bytes of the last item must be unset.
+    data: Vec<U256>,
+}
+
+/// Converts bytes into a format compatible with `pyth::byte_array::ByteArray`.
+fn to_cairo_byte_array_data(data: &[u8]) -> CairoByteArrayData {
+    let mut pos = 0;
+    let mut r = Vec::new();
+    while pos < data.len() {
+        if pos + 31 <= data.len() {
+            let mut buf = [0u8; 32];
+            buf[1..].copy_from_slice(&data[pos..pos + 31]);
+            r.push(U256::from_big_endian(&buf));
+        } else {
+            let mut buf = [0u8; 32];
+            let len = data.len() - pos;
+            buf[32 - len..].copy_from_slice(&data[pos..]);
+            r.push(U256::from_big_endian(&buf));
+            return CairoByteArrayData {
+                num_last_bytes: len,
+                data: r,
+            };
+        }
+        pos += 31;
+    }
+    CairoByteArrayData {
+        num_last_bytes: 0,
+        data: r,
+    }
+}
+
+/// Print data in the format compatible with `starkli invoke` or `starkli call`.
+pub fn print_as_cli_input(data: &[u8]) {
+    let data = to_cairo_byte_array_data(data);
+    print!("{} {} ", data.num_last_bytes, data.data.len());
+    for item in data.data {
+        print!("{item} ");
+    }
+    println!();
+}
+
+/// Print data in the format suitable for embedding in tests.
+pub fn print_as_array_and_last(data: &[u8]) {
+    let data = to_cairo_byte_array_data(data);
+    println!("let bytes = array![");
+    for item in data.data {
+        println!("    {item},");
+    }
+    println!("];");
+    println!("let last = {};", data.num_last_bytes);
+}