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86b3ac5108
Use --lock-write=lock.json or --lock-check=lock.json on the command line.
70 lines
1.8 KiB
Rust
70 lines
1.8 KiB
Rust
use crate::compilers::CompiledModule;
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use serde_json::json;
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pub use serde_json::Value;
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use std::collections::HashMap;
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use std::io::Result;
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pub struct Lockfile {
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need_read: bool,
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map: HashMap<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) -> Lockfile {
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Lockfile {
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map: HashMap::new(),
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filename,
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need_read: true,
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}
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}
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pub fn write(&self) -> Result<()> {
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let j = json!(self.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 read(&mut self) -> Result<()> {
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debug!("lockfile read {}", self.filename);
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let s = std::fs::read_to_string(&self.filename)?;
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self.map = serde_json::from_str(&s)?;
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self.need_read = false;
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Ok(())
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}
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/// Lazily reads the filename, checks the given module is included.
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/// Returns Ok(true) if check passed
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pub fn check(&mut self, m: &CompiledModule) -> Result<bool> {
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if m.name.starts_with("file:") {
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return Ok(true);
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}
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if self.need_read {
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self.read()?;
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}
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assert!(!self.need_read);
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Ok(if let Some(lockfile_checksum) = self.map.get(&m.name) {
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let compiled_checksum = crate::checksum::gen2(&m.code);
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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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// Returns true if module was not already inserted.
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pub fn insert(&mut self, m: &CompiledModule) -> bool {
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if m.name.starts_with("file:") {
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return false;
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}
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let checksum = crate::checksum::gen2(&m.code);
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self.map.insert(m.name.clone(), checksum).is_none()
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}
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}
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