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use super::DirectoryPutter;
use super::DirectoryService;
use super::{Directory, DirectoryGraph, LeavesToRootValidator};
use crate::B3Digest;
use crate::Error;
use tonic::async_trait;
use tracing::instrument;
use tracing::warn;
/// This is an implementation of DirectoryPutter that simply
/// inserts individual Directory messages one by one, on close, after
/// they successfully validated.
pub struct SimplePutter<DS: DirectoryService> {
directory_service: DS,
directory_validator: Option<DirectoryGraph<LeavesToRootValidator>>,
}
impl<DS: DirectoryService> SimplePutter<DS> {
pub fn new(directory_service: DS) -> Self {
Self {
directory_service,
directory_validator: Some(Default::default()),
}
}
}
#[async_trait]
impl<DS: DirectoryService + 'static> DirectoryPutter for SimplePutter<DS> {
#[instrument(level = "trace", skip_all, fields(directory.digest=%directory.digest()), err)]
async fn put(&mut self, directory: Directory) -> Result<(), Error> {
match self.directory_validator {
None => return Err(Error::StorageError("already closed".to_string())),
Some(ref mut validator) => {
validator
.add(directory)
.map_err(|e| Error::StorageError(e.to_string()))?;
}
}
Ok(())
}
#[instrument(level = "trace", skip_all, ret, err)]
async fn close(&mut self) -> Result<B3Digest, Error> {
match self.directory_validator.take() {
None => Err(Error::InvalidRequest("already closed".to_string())),
Some(validator) => {
// retrieve the validated directories.
let directories = validator
.validate()
.map_err(|e| Error::StorageError(e.to_string()))?
.drain_leaves_to_root()
.collect::<Vec<_>>();
// Get the root digest, which is at the end (cf. insertion order)
let root_digest = directories
.last()
.ok_or_else(|| Error::InvalidRequest("got no directories".to_string()))?
.digest();
// call an individual put for each directory and await the insertion.
for directory in directories {
let exp_digest = directory.digest();
let actual_digest = self.directory_service.put(directory).await?;
// ensure the digest the backend told us matches our expectations.
if exp_digest != actual_digest {
warn!(directory.digest_expected=%exp_digest, directory.digest_actual=%actual_digest, "unexpected digest");
return Err(Error::StorageError(
"got unexpected digest from backend during put".into(),
));
}
}
Ok(root_digest)
}
}
}
}
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