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