Remove protocol buffer compiler

.github/workflows/build-lint-test-and-upload.yml

@@ -77,12 +77,6 @@ jobs:
         sleep 5 # Ensure azurite has fully finished creating the endpoint.
         az storage container create -n modelardb --connection-string 'DefaultEndpointsProtocol=http;AccountName=devstoreaccount1;AccountKey=Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/K1SZFPTOtr/KBHBeksoGMGw==;BlobEndpoint=http://127.0.0.1:10000/devstoreaccount1;QueueEndpoint=http://127.0.0.1:10001/devstoreaccount1;'
 
-    # Setup Protobuf Compiler.
-    - name: Install Protoc
-      uses: arduino/setup-protoc@v3
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
-
     # Update Rust.
     - name: Rustup Update
       run: rustup update
@@ -150,12 +144,6 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v4
 
-    # Setup Protobuf Compiler.
-    - name: Install Protoc
-      uses: arduino/setup-protoc@v3
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
-
     # Update Rust.
     - name: Rustup Update
       run: rustup update

Cargo.toml

@@ -37,6 +37,7 @@ object_store = "0.13.2"
 proptest = "1.11.0"
 prost = "0.14.3"
 prost-build = "0.14.3"
+protox = "0.9.1"
 rand = "0.10.1"
 rustyline = "18.0.0"
 serde = { version = "1.0.228", features = ["derive"] }

Dockerfile

@@ -20,8 +20,6 @@ WORKDIR /usr/src/app
 
 COPY . .
 
-RUN apt-get update && apt-get install -y protobuf-compiler
-
 RUN cargo build --profile $BUILD_PROFILE
 
 CMD ["target/release/modelardbd", "edge", "data"]

crates/modelardb_embedded/bindings/python/setup.py

@@ -135,7 +135,7 @@ def build_extension(self, ext):
 
         :param ext: Information about the extension setuptools expects.
         """
-        dependencies = ["cargo", "rustc", "protoc"]
+        dependencies = ["cargo", "rustc"]
         for dependency in dependencies:
             if not shutil.which(dependency):
                 raise FileNotFoundError(

crates/modelardb_types/Cargo.toml

@@ -29,10 +29,11 @@ prost.workspace = true
 
 [build-dependencies]
 prost-build.workspace = true
+protox.workspace = true
 
 [dev-dependencies]
 modelardb_test = { path = "../modelardb_test" }
 proptest.workspace = true
 
 [package.metadata.cargo-machete]
-ignored = ["prost-build"]
+ignored = ["prost-build", "protox"]

crates/modelardb_types/build.rs

@@ -1,9 +1,28 @@
-use std::io::Result as StdIoResult;
+/* Copyright 2026 The ModelarDB Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
-fn main() -> StdIoResult<()> {
-    // Tell Cargo to rerun the build script if the proto definition changes.
+use std::error::Error;
+
+fn main() -> Result<(), Box<dyn Error>> {
+    // Rerun the build script if the proto definition changes.
     println!("cargo::rerun-if-changed=src/flight/protocol.proto");
 
-    prost_build::compile_protos(&["src/flight/protocol.proto"], &["src/"])?;
+    // Compile with the pure Rust protox compiler instead of protoc, then let prost-build generate
+    // Rust from the resulting FileDescriptorSet.
+    let file_descriptors = protox::compile(["src/flight/protocol.proto"], ["src/"])?;
+    prost_build::compile_fds(file_descriptors)?;
+
     Ok(())
 }

docs/user/README.md

@@ -30,16 +30,15 @@ The following commands are for Ubuntu Server. However, equivalent commands shoul
 
 ### All
 2. Install the latest stable [Rust Toolchain](https://rustup.rs/).
-3. Install the [Protocol Buffer Compiler](https://protobuf.dev/installation/).
-4. Clone the repository: `git clone https://github.com/ModelarData/ModelarDB-RS`
-5. Build, test, and run the system using Cargo:
+3. Clone the repository: `git clone https://github.com/ModelarData/ModelarDB-RS`
+4. Build, test, and run the system using Cargo:
    - Debug Build: `cargo build`
    - Release Build: `cargo build --release`
    - Run Tests: `cargo test`
    - Run DBMS Server: `cargo run --bin modelardbd edge path_to_local_data_folder`
    - Run Client: `cargo run --bin modelardb [options] [query_file]`
-6. Move `modelardbd`, `modelardb`, and `modelardbb` from the `target` directory to any directory.
-7. Install and test the Python bindings for `modelardb_embedded` using Python:
+5. Move `modelardbd`, `modelardb`, and `modelardbb` from the `target` directory to any directory.
+6. Install and test the Python bindings for `modelardb_embedded` using Python:
    - Install: `python3 -m pip install .`
    - Run Tests: `python3 -m unittest`