├── .gitignore
├── Cargo.lock
├── Cargo.toml
├── LICENSE
├── README.md
├── build.rs
├── proto
    └── calculator.proto
└── src
    ├── client.rs
    └── main.rs


/.gitignore:
--------------------------------------------------------------------------------
1 | /target
2 | 


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--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "calculator"
 3 | version = "0.1.0"
 4 | edition = "2021"
 5 | 
 6 | # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 7 | 
 8 | [dependencies]
 9 | tonic = "0.11"
10 | tokio = { version = "1", features = ["full"] }
11 | tonic-reflection = "0.11"
12 | prost = "0.12.3"
13 | tonic-web = "0.11"
14 | tower-http = "0.4"
15 | 
16 | [build-dependencies]
17 | tonic-build = "0.11"
18 | 
19 | [[bin]]
20 | name = "server"
21 | path = "src/main.rs"
22 | 
23 | [[bin]]
24 | name = "client"
25 | path = "src/client.rs"
26 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
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619 |                      END OF TERMS AND CONDITIONS
620 | 
621 |             How to Apply These Terms to Your New Programs
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623 |   If you develop a new program, and you want it to be of the greatest
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630 | the "copyright" line and a pointer to where the full notice is found.
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647 | 
648 | Also add information on how to contact you by electronic and paper mail.
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657 | 
658 |   You should also get your employer (if you work as a programmer) or school,
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660 | For more information on this, and how to apply and follow the GNU AGPL, see
661 | <https://www.gnu.org/licenses/>.
662 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # grpcalculator-rs
 2 | 
 3 | This is the companion project to the Dreams of Code YouTube video on [Rust and gRPC with Tonic](https://youtu.be/kerKXChDmsE)
 4 | 
 5 | Please see the linked video for more information.
 6 | 
 7 | # Requirements
 8 | 
 9 | ## Rust
10 | In order to run this code, you'll need at least Rust 1.76 installed on your system.
11 | 
12 | ## Protoc
13 | As well as rust, you'll also need the protobuf compiler as well.
14 | 
15 | ### Arch
16 | 
17 | ```
18 | pacman -S protobuf
19 | ```
20 | 
21 | ### macOS
22 | 
23 | ```
24 | brew install protobuf
25 | ```
26 | 
27 | # Running
28 | 
29 | This project contains two binaries, a server and a client.
30 | 
31 | ## Server
32 | 
33 | ```
34 | cargo run --bin server
35 | ```
36 | 
37 | ## Client
38 | 
39 | ```
40 | cargo run --bin client
41 | ```
42 | 
43 | # Frontend
44 | 
45 | There is a companion frontend project that goes with this code found [here](https://github.com/dreamsofcode-io/grpcalculator-web)
46 | 


--------------------------------------------------------------------------------
/build.rs:
--------------------------------------------------------------------------------
 1 | use std::error::Error;
 2 | use std::{env, path::PathBuf};
 3 | 
 4 | fn main() -> Result<(), Box<dyn Error>> {
 5 |     let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
 6 | 
 7 |     tonic_build::configure()
 8 |         .file_descriptor_set_path(out_dir.join("calculator_descriptor.bin"))
 9 |         .compile(&["proto/calculator.proto"], &["proto"])?;
10 | 
11 |     tonic_build::compile_protos("proto/calculator.proto")?;
12 | 
13 |     Ok(())
14 | }
15 | 


--------------------------------------------------------------------------------
/proto/calculator.proto:
--------------------------------------------------------------------------------
 1 | syntax = "proto3";
 2 | 
 3 | package calculator;
 4 | 
 5 | service Calculator {
 6 |   rpc Add(CalculationRequest) returns (CalculationResponse);
 7 |   rpc Divide(CalculationRequest) returns (CalculationResponse);
 8 | }
 9 | 
10 | message CalculationRequest {
11 |   int64 a = 1;
12 |   int64 b = 2;
13 | }
14 | 
15 | message CalculationResponse { int64 result = 1; }
16 | 
17 | service Admin {
18 |   rpc GetRequestCount(GetCountRequest) returns (CounterResponse);
19 | }
20 | 
21 | message GetCountRequest {}
22 | 
23 | message CounterResponse { uint64 count = 1; }
24 | 


--------------------------------------------------------------------------------
/src/client.rs:
--------------------------------------------------------------------------------
 1 | use proto::calculator_client::CalculatorClient;
 2 | use std::error::Error;
 3 | 
 4 | pub mod proto {
 5 |     tonic::include_proto!("calculator");
 6 | }
 7 | 
 8 | #[tokio::main]
 9 | async fn main() -> Result<(), Box<dyn Error>> {
10 |     let url = "http://[::1]:50051";
11 |     let mut client = CalculatorClient::connect(url).await?;
12 | 
13 |     let req = proto::CalculationRequest { a: 4, b: 5 };
14 |     let request = tonic::Request::new(req);
15 | 
16 |     let response = client.add(request).await?;
17 | 
18 |     println!("Response: {:?}", response.get_ref().result);
19 | 
20 |     Ok(())
21 | }
22 | 


--------------------------------------------------------------------------------
/src/main.rs:
--------------------------------------------------------------------------------
  1 | use proto::admin_server::{Admin, AdminServer};
  2 | use proto::calculator_server::{Calculator, CalculatorServer};
  3 | use tonic::transport::Server;
  4 | 
  5 | mod proto {
  6 |     tonic::include_proto!("calculator");
  7 | 
  8 |     pub(crate) const FILE_DESCRIPTOR_SET: &[u8] =
  9 |         tonic::include_file_descriptor_set!("calculator_descriptor");
 10 | }
 11 | 
 12 | type State = std::sync::Arc<tokio::sync::RwLock<u64>>;
 13 | 
 14 | #[derive(Debug, Default)]
 15 | struct CalculatorService {
 16 |     state: State,
 17 | }
 18 | 
 19 | impl CalculatorService {
 20 |     async fn increment_counter(&self) {
 21 |         let mut count = self.state.write().await;
 22 |         *count += 1;
 23 |     }
 24 | }
 25 | 
 26 | #[tonic::async_trait]
 27 | impl Calculator for CalculatorService {
 28 |     async fn add(
 29 |         &self,
 30 |         request: tonic::Request<proto::CalculationRequest>,
 31 |     ) -> Result<tonic::Response<proto::CalculationResponse>, tonic::Status> {
 32 |         self.increment_counter().await;
 33 | 
 34 |         let input = request.get_ref();
 35 | 
 36 |         let response = proto::CalculationResponse {
 37 |             result: input.a + input.b,
 38 |         };
 39 | 
 40 |         Ok(tonic::Response::new(response))
 41 |     }
 42 | 
 43 |     async fn divide(
 44 |         &self,
 45 |         request: tonic::Request<proto::CalculationRequest>,
 46 |     ) -> Result<tonic::Response<proto::CalculationResponse>, tonic::Status> {
 47 |         self.increment_counter().await;
 48 | 
 49 |         let input = request.get_ref();
 50 | 
 51 |         if input.b == 0 {
 52 |             return Err(tonic::Status::invalid_argument("cannot divide by zero"));
 53 |         }
 54 | 
 55 |         let response = proto::CalculationResponse {
 56 |             result: input.a / input.b,
 57 |         };
 58 | 
 59 |         Ok(tonic::Response::new(response))
 60 |     }
 61 | }
 62 | 
 63 | #[derive(Default, Debug)]
 64 | struct AdminService {
 65 |     state: State,
 66 | }
 67 | 
 68 | #[tonic::async_trait]
 69 | impl Admin for AdminService {
 70 |     async fn get_request_count(
 71 |         &self,
 72 |         _request: tonic::Request<proto::GetCountRequest>,
 73 |     ) -> Result<tonic::Response<proto::CounterResponse>, tonic::Status> {
 74 |         let count = self.state.read().await;
 75 |         let response = proto::CounterResponse { count: *count };
 76 | 
 77 |         Ok(tonic::Response::new(response))
 78 |     }
 79 | }
 80 | 
 81 | use tonic::metadata::MetadataValue;
 82 | use tonic::{Request, Status};
 83 | 
 84 | fn check_auth(req: Request<()>) -> Result<Request<()>, Status> {
 85 |     let token: MetadataValue<_> = "Bearer some-secret-token".parse().unwrap();
 86 | 
 87 |     match req.metadata().get("authorization") {
 88 |         Some(t) if token == t => Ok(req),
 89 |         _ => Err(Status::unauthenticated("No valid auth token")),
 90 |     }
 91 | }
 92 | 
 93 | #[tokio::main]
 94 | async fn main() -> Result<(), Box<dyn std::error::Error>> {
 95 |     let addr = "[::1]:50051".parse()?;
 96 | 
 97 |     let state = State::default();
 98 | 
 99 |     let calc = CalculatorService {
100 |         state: state.clone(),
101 |     };
102 | 
103 |     let admin = AdminService {
104 |         state: state.clone(),
105 |     };
106 | 
107 |     let service = tonic_reflection::server::Builder::configure()
108 |         .register_encoded_file_descriptor_set(proto::FILE_DESCRIPTOR_SET)
109 |         .build()?;
110 | 
111 |     Server::builder()
112 |         .accept_http1(true)
113 |         .layer(tower_http::cors::CorsLayer::permissive())
114 |         .add_service(service)
115 |         .add_service(tonic_web::enable(CalculatorServer::new(calc)))
116 |         .add_service(AdminServer::with_interceptor(admin, check_auth))
117 |         .serve(addr)
118 |         .await?;
119 | 
120 |     Ok(())
121 | }
122 | 


--------------------------------------------------------------------------------