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Make worker-build support custom JS shims #686

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merged 1 commit into from
Jan 6, 2025
Merged

Make worker-build support custom JS shims #686

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16 changes: 13 additions & 3 deletions worker-build/src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@

use std::{
env::{self, VarError},
fs::{self, File},
fs::{self, read_to_string, File},
io::{Read, Write},
path::{Path, PathBuf},
process::{Command, Stdio},
Expand Down Expand Up @@ -38,10 +38,20 @@ pub fn main() -> Result<()> {
create_worker_dir()?;
copy_generated_code_to_worker_dir()?;

let shim_template = match env::var("CUSTOM_SHIM") {
Ok(path) => {
let path = Path::new(&path).to_owned();
println!("Using custom shim from {}", path.display());
// NOTE: we fail in case that file doesnt exist or something else happens
read_to_string(path)?
}
Err(_) => SHIM_TEMPLATE.to_owned(),
};

let shim = if env::var("RUN_TO_COMPLETION").is_ok() {
SHIM_TEMPLATE.replace("$WAIT_UNTIL_RESPONSE", "this.ctx.waitUntil(response);")
shim_template.replace("$WAIT_UNTIL_RESPONSE", "this.ctx.waitUntil(response);")
} else {
SHIM_TEMPLATE.replace("$WAIT_UNTIL_RESPONSE", "")
shim_template.replace("$WAIT_UNTIL_RESPONSE", "")
};

write_string_to_file(worker_path("shim.js"), shim)?;
Expand Down
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