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use std::env;
use std::fs;
use std::io;
use std::path::{Path, PathBuf};
const COMPACT_FORMATS_PROTO: &str = "proto/compact_formats.proto";
#[cfg(feature = "lightwalletd-tonic")]
const SERVICE_PROTO: &str = "proto/service.proto";
fn main() -> io::Result<()> {
// - We don't include the proto files in releases so that downstreams do not need to
// regenerate the bindings even if protoc is present.
// - We check for the existence of protoc in the same way as prost_build, so that
// people building from source do not need to have protoc installed. If they make
// changes to the proto files, the discrepancy will be caught by CI.
if Path::new(COMPACT_FORMATS_PROTO).exists()
&& env::var_os("PROTOC")
.map(PathBuf::from)
.or_else(|| which::which("protoc").ok())
.is_some()
{
build()?;
}
Ok(())
}
fn build() -> io::Result<()> {
let out: PathBuf = env::var_os("OUT_DIR")
.expect("Cannot find OUT_DIR environment variable")
.into();
// Build the compact format types.
tonic_build::compile_protos(COMPACT_FORMATS_PROTO)?;
// Copy the generated types into the source tree so changes can be committed.
fs::copy(
out.join("cash.z.wallet.sdk.rpc.rs"),
"src/proto/compact_formats.rs",
)?;
#[cfg(feature = "lightwalletd-tonic")]
{
// Build the gRPC types and client.
tonic_build::configure()
.build_server(false)
.extern_path(
".cash.z.wallet.sdk.rpc.CompactBlock",
"crate::proto::compact_formats::CompactBlock",
)
.extern_path(
".cash.z.wallet.sdk.rpc.CompactTx",
"crate::proto::compact_formats::CompactTx",
)
.extern_path(
".cash.z.wallet.sdk.rpc.CompactSaplingSpend",
"crate::proto::compact_formats::CompactSaplingSpend",
)
.extern_path(
".cash.z.wallet.sdk.rpc.CompactSaplingOutput",
"crate::proto::compact_formats::CompactSaplingOutput",
)
.extern_path(
".cash.z.wallet.sdk.rpc.CompactOrchardAction",
"crate::proto::compact_formats::CompactOrchardAction",
)
.compile(&[SERVICE_PROTO], &["proto/"])?;
// Copy the generated types into the source tree so changes can be committed. The
// file has the same name as for the compact format types because they have the
// same package, but we've set things up so this only contains the service types.
fs::copy(out.join("cash.z.wallet.sdk.rpc.rs"), "src/proto/service.rs")?;
}
Ok(())
}