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use serde_json::json;
use std::collections::BTreeMap;
use std::io::Result;
pub struct Lockfile {
write: bool,
map: BTreeMap<String, String>,
pub filename: String,
}
impl Lockfile {
pub fn new(filename: String, write: bool) -> Result<Lockfile> {
debug!("lockfile \"{}\", write: {}", filename, write);
let map = if write {
BTreeMap::new()
} else {
let s = std::fs::read_to_string(&filename)?;
serde_json::from_str(&s)?
};
Ok(Lockfile {
write,
map,
filename,
})
}
// Synchronize lock file to disk - noop if --lock-write file is not specified.
pub fn write(&self) -> Result<()> {
if !self.write {
return Ok(());
}
// Will perform sort so output is deterministic
let map: BTreeMap<_, _> = self.map.iter().collect();
let j = json!(map);
let s = serde_json::to_string_pretty(&j).unwrap();
let mut f = std::fs::OpenOptions::new()
.write(true)
.create(true)
.truncate(true)
.open(&self.filename)?;
use std::io::Write;
f.write_all(s.as_bytes())?;
debug!("lockfile write {}", self.filename);
Ok(())
}
pub fn check_or_insert(&mut self, specifier: &str, code: &str) -> bool {
if self.write {
// In case --lock-write is specified check always passes
self.insert(specifier, code);
true
} else {
self.check(specifier, code)
}
}
/// Checks the given module is included.
/// Returns Ok(true) if check passed.
fn check(&mut self, specifier: &str, code: &str) -> bool {
if specifier.starts_with("file:") {
return true;
}
if let Some(lockfile_checksum) = self.map.get(specifier) {
let compiled_checksum = crate::checksum::gen(&[code.as_bytes()]);
lockfile_checksum == &compiled_checksum
} else {
false
}
}
fn insert(&mut self, specifier: &str, code: &str) {
if specifier.starts_with("file:") {
return;
}
let checksum = crate::checksum::gen(&[code.as_bytes()]);
self.map.insert(specifier.to_string(), checksum);
}
}
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