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Expose grpc_health_v1 descriptor set in tonic-health for use with the reflection service #620

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merged 4 commits into from
Jul 13, 2021
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Expose grpc_health_v1 descriptor set in tonic-health for use with the reflection service #620

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b0d2a8c
adds grpc health v1 descriptor set
byblakeorriver Apr 30, 2021
714adf7
add new line to gitignore
byblakeorriver Apr 30, 2021
c039b2b
clean up gitignore
byblakeorriver May 2, 2021
1a4fde3
remove dead code tag
byblakeorriver Jun 24, 2021
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6 changes: 6 additions & 0 deletions tonic-health/build.rs
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Original file line number Diff line number Diff line change
@@ -1,5 +1,11 @@
use std::env;
use std::path::PathBuf;

fn main() -> Result<(), Box<dyn std::error::Error>> {
let grpc_health_v1_descriptor_set_path: PathBuf =
PathBuf::from(env::var("OUT_DIR").unwrap()).join("grpc_health_v1.bin");
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OUT_DIR might not be set except in the build environment.

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Pretty sure it is set when build.rs is ran.

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OUT_DIR — If the package has a build script, this is set to the folder where the build script should place its output. See below for more information. (Only set during compilation.)

Found here: https://doc.rust-lang.org/cargo/reference/environment-variables.html#:~:text=OUT_DIR%20%E2%80%94%20If%20the%20package%20has,(Only%20set%20during%20compilation.)

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But, if you want, I can add a check instead of using .unwrap() here.

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My only question in that case would be, what behavior would you expect if the OUT_DIR didn't exist?

Would there just be an error saying that the OUT_DIR wasn't set and not produce the descriptor set?

What would say about this @LucioFranco?

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I think we can trust that OUT_DIR will be there, because this script is also compiling the proto I think its safe.

tonic_build::configure()
.file_descriptor_set_path(grpc_health_v1_descriptor_set_path)
.build_server(true)
.build_client(true)
.format(false)
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3 changes: 3 additions & 0 deletions tonic-health/src/lib.rs
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Expand Up @@ -28,6 +28,9 @@ pub mod proto {
#![allow(unreachable_pub)]
#![allow(missing_docs)]
tonic::include_proto!("grpc.health.v1");

pub const GRPC_HEALTH_V1_FILE_DESCRIPTOR_SET: &'static [u8] =
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Would it make sense to include a test here maybe?

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I can do that. It will be a few days before I have the time, but I will get that worked in.

tonic::include_file_descriptor_set!("grpc_health_v1");
}

pub mod server;
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