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+---
+title: "Importing External Schemas in Prost"
+date: 2024-10-05T11:19:37-07:00
+draft: false
+tags: []
+math: false
+medium_enabled: false
+---
+
+[Prost](https://github.com/tokio-rs/prost) is a popular Protocol Buffers implementation written in Rust. The `protoc` command is commonly used to generate serializers and de-serializers for many different languages. However, the Prost team instead recommends compiling the Protocol Buffers schema directly within `build.rs`. 
+
+In this post, I'll give a quick tutorial on how I compiled my Protocol Buffers schema when I needed to depend on another package with its own PB messages.
+
+Let's say I have a Rust package called `people`. It contains a file called `Person.proto` with the following contents:
+
+```protobuf
+syntax = "proto3";
+package people;
+
+message Employee {
+  string name = 1;
+  string position = 2;
+}
+```
+
+For sake of our example, we'll assume they exposed the data structures via a `proto` submodule. However, you can check what the module name actually is by looking at the package's codebase for something like
+
+```rust
+pub mod namespace_name_goes_here {
+    #![allow(missing_docs)]
+    include!(concat!(env!("OUT_DIR"), "/people.rs"));
+}
+```
+
+Now to the package we're creating (which I'll call `company`), First, make sure that you added the `people` package to the Cargo.toml.
+
+Then say that we have the following file `schemas/Team.proto`
+
+```protobuf
+syntax = "proto3";
+package company;
+
+import "Person.proto"
+
+message Team {
+  repeated people.Employee members = 1;
+}
+```
+
+To compile our new message, we need to tell `build.rs` where it can find both the `Person.proto` and the `Team.proto` schema files, as well as how to reference the messages in the `people` namespace.
+
+```rust
+fn main() {
+    // Other awesome build stuff
+    generate_schemas();
+}
+fn generate_schemas() {
+    let mut config = prost_build::Config::new();
+    // Map the people protocol buffer namespace to the people::proto Rust module
+    config.extern_path(".people", "people::proto");
+    config
+        .compile_protos(
+            // Files we want to compile
+            &["./schema/Team.proto"],
+            // Folders where we can find our imports
+            &["./schema"],
+        )
+        .expect("Prost protobuf compilation error;");
+}
+```
+
+The function `extern_path` takes two arguments, the first one is the name of the namespace within the Protocol Buffers schema, and the second argument is the namespace within Rust.
+
+The first argument of `compile_protos` is the files that we want to compile, the second argument is the directories in which we can find our schemas.
+
+Note that we import `People.proto` in our new Protocol Buffers schema. Currently the only way that I know to get this to work, is to manually copy the `.proto` file in the other package into your own application. 
+
+There you have it! Next you can include the generated output into your Rust application. If you know of a better way to include external schemas without copying the schemas, please reach out.