472 lines
14 KiB
Rust
472 lines
14 KiB
Rust
use garage_table::util::EmptyKey;
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use garage_util::crdt::*;
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use garage_util::data::*;
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use garage_util::error::{Error as GarageError, OkOrMessage};
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use garage_util::time::*;
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use crate::bucket_alias_table::*;
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use crate::bucket_table::*;
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use crate::garage::Garage;
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use crate::helper::error::*;
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use crate::key_table::{Key, KeyFilter};
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use crate::permission::BucketKeyPerm;
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pub struct BucketHelper<'a>(pub(crate) &'a Garage);
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#[allow(clippy::ptr_arg)]
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impl<'a> BucketHelper<'a> {
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pub async fn resolve_global_bucket_name(
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&self,
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bucket_name: &String,
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) -> Result<Option<Uuid>, Error> {
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// Bucket names in Garage are aliases, true bucket identifiers
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// are 32-byte UUIDs. This function resolves bucket names into
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// their full identifier by looking up in the bucket_alias_table.
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// This function also allows buckets to be identified by their
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// full UUID (hex-encoded). Here, if the name to be resolved is a
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// hex string of the correct length, it is directly parsed as a bucket
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// identifier which is returned. There is no risk of this conflicting
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// with an actual bucket name: bucket names are max 63 chars long by
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// the AWS spec, and hex-encoded UUIDs are 64 chars long.
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let hexbucket = hex::decode(bucket_name.as_str())
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.ok()
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.map(|by| Uuid::try_from(&by))
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.flatten();
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if let Some(bucket_id) = hexbucket {
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Ok(self
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.0
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.bucket_table
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.get(&EmptyKey, &bucket_id)
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.await?
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.filter(|x| !x.state.is_deleted())
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.map(|_| bucket_id))
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} else {
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Ok(self
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.0
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.bucket_alias_table
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.get(&EmptyKey, bucket_name)
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.await?
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.map(|x| *x.state.get())
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.flatten())
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}
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}
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/// Returns a Bucket if it is present in bucket table,
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/// even if it is in deleted state. Querying a non-existing
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/// bucket ID returns an internal error.
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pub async fn get_internal_bucket(&self, bucket_id: Uuid) -> Result<Bucket, Error> {
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Ok(self
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.0
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.bucket_table
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.get(&EmptyKey, &bucket_id)
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.await?
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.ok_or_message(format!("Bucket {:?} does not exist", bucket_id))?)
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}
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/// Returns a Bucket if it is present in bucket table,
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/// only if it is in non-deleted state.
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/// Querying a non-existing bucket ID or a deleted bucket
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/// returns a bad request error.
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pub async fn get_existing_bucket(&self, bucket_id: Uuid) -> Result<Bucket, Error> {
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self.0
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.bucket_table
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.get(&EmptyKey, &bucket_id)
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.await?
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.filter(|b| !b.is_deleted())
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.ok_or_bad_request(format!(
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"Bucket {:?} does not exist or has been deleted",
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bucket_id
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))
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}
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/// Returns a Key if it is present in key table,
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/// even if it is in deleted state. Querying a non-existing
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/// key ID returns an internal error.
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pub async fn get_internal_key(&self, key_id: &String) -> Result<Key, Error> {
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Ok(self
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.0
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.key_table
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.get(&EmptyKey, key_id)
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.await?
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.ok_or_message(format!("Key {} does not exist", key_id))?)
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}
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/// Returns a Key if it is present in key table,
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/// only if it is in non-deleted state.
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/// Querying a non-existing key ID or a deleted key
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/// returns a bad request error.
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pub async fn get_existing_key(&self, key_id: &String) -> Result<Key, Error> {
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self.0
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.key_table
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.get(&EmptyKey, key_id)
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.await?
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.filter(|b| !b.state.is_deleted())
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.ok_or_bad_request(format!("Key {} does not exist or has been deleted", key_id))
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}
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/// Returns a Key if it is present in key table,
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/// looking it up by key ID or by a match on its name,
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/// only if it is in non-deleted state.
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/// Querying a non-existing key ID or a deleted key
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/// returns a bad request error.
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pub async fn get_existing_matching_key(&self, pattern: &str) -> Result<Key, Error> {
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let candidates = self
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.0
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.key_table
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.get_range(
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&EmptyKey,
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None,
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Some(KeyFilter::MatchesAndNotDeleted(pattern.to_string())),
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10,
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)
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.await?
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.into_iter()
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.collect::<Vec<_>>();
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if candidates.len() != 1 {
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Err(Error::BadRequest(format!(
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"{} matching keys",
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candidates.len()
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)))
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} else {
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Ok(candidates.into_iter().next().unwrap())
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}
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}
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/// Sets a new alias for a bucket in global namespace.
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/// This function fails if:
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/// - alias name is not valid according to S3 spec
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/// - bucket does not exist or is deleted
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/// - alias already exists and points to another bucket
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pub async fn set_global_bucket_alias(
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&self,
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bucket_id: Uuid,
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alias_name: &String,
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) -> Result<(), Error> {
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if !is_valid_bucket_name(alias_name) {
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return Err(Error::BadRequest(format!(
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"{}: {}",
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alias_name, INVALID_BUCKET_NAME_MESSAGE
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)));
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}
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let mut bucket = self.get_existing_bucket(bucket_id).await?;
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let alias = self.0.bucket_alias_table.get(&EmptyKey, alias_name).await?;
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if let Some(existing_alias) = alias.as_ref() {
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if let Some(p_bucket) = existing_alias.state.get() {
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if *p_bucket != bucket_id {
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return Err(Error::BadRequest(format!(
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"Alias {} already exists and points to different bucket: {:?}",
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alias_name, p_bucket
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)));
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}
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}
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}
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// Checks ok, add alias
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let mut bucket_p = bucket.state.as_option_mut().unwrap();
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let alias_ts = increment_logical_clock_2(
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bucket_p.aliases.get_timestamp(alias_name),
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alias.as_ref().map(|a| a.state.timestamp()).unwrap_or(0),
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);
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// ---- timestamp-ensured causality barrier ----
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// writes are now done and all writes use timestamp alias_ts
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let alias = match alias {
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None => BucketAlias::new(alias_name.clone(), alias_ts, Some(bucket_id))
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.ok_or_bad_request(format!("{}: {}", alias_name, INVALID_BUCKET_NAME_MESSAGE))?,
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Some(mut a) => {
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a.state = Lww::raw(alias_ts, Some(bucket_id));
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a
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}
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};
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self.0.bucket_alias_table.insert(&alias).await?;
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bucket_p.aliases = LwwMap::raw_item(alias_name.clone(), alias_ts, true);
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self.0.bucket_table.insert(&bucket).await?;
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Ok(())
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}
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/// Unsets an alias for a bucket in global namespace.
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/// This function fails if:
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/// - bucket does not exist or is deleted
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/// - alias does not exist or maps to another bucket (-> internal error)
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/// - bucket has no other aliases (global or local)
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pub async fn unset_global_bucket_alias(
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&self,
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bucket_id: Uuid,
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alias_name: &String,
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) -> Result<(), Error> {
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let mut bucket = self.get_existing_bucket(bucket_id).await?;
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let mut bucket_state = bucket.state.as_option_mut().unwrap();
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let mut alias = self
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.0
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.bucket_alias_table
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.get(&EmptyKey, alias_name)
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.await?
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.filter(|a| a.state.get().map(|x| x == bucket_id).unwrap_or(false))
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.ok_or_message(format!(
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"Internal error: alias not found or does not point to bucket {:?}",
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bucket_id
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))?;
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let has_other_global_aliases = bucket_state
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.aliases
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.items()
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.iter()
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.any(|(name, _, active)| name != alias_name && *active);
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let has_other_local_aliases = bucket_state
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.local_aliases
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.items()
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.iter()
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.any(|(_, _, active)| *active);
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if !has_other_global_aliases && !has_other_local_aliases {
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return Err(Error::BadRequest(format!("Bucket {} doesn't have other aliases, please delete it instead of just unaliasing.", alias_name)));
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}
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// Checks ok, remove alias
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let alias_ts = increment_logical_clock_2(
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alias.state.timestamp(),
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bucket_state.aliases.get_timestamp(alias_name),
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);
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// ---- timestamp-ensured causality barrier ----
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// writes are now done and all writes use timestamp alias_ts
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alias.state = Lww::raw(alias_ts, None);
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self.0.bucket_alias_table.insert(&alias).await?;
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bucket_state.aliases = LwwMap::raw_item(alias_name.clone(), alias_ts, false);
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self.0.bucket_table.insert(&bucket).await?;
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Ok(())
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}
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/// Ensures a bucket does not have a certain global alias.
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/// Contrarily to unset_global_bucket_alias, this does not
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/// fail on any condition other than:
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/// - bucket cannot be found (its fine if it is in deleted state)
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/// - alias cannot be found (its fine if it points to nothing or
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/// to another bucket)
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pub async fn purge_global_bucket_alias(
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&self,
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bucket_id: Uuid,
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alias_name: &String,
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) -> Result<(), Error> {
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let mut bucket = self.get_internal_bucket(bucket_id).await?;
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let mut alias = self
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.0
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.bucket_alias_table
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.get(&EmptyKey, alias_name)
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.await?
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.ok_or_message(format!("Alias {} not found", alias_name))?;
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// Checks ok, remove alias
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let alias_ts = match bucket.state.as_option() {
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Some(bucket_state) => increment_logical_clock_2(
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alias.state.timestamp(),
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bucket_state.aliases.get_timestamp(alias_name),
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),
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None => increment_logical_clock(alias.state.timestamp()),
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};
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// ---- timestamp-ensured causality barrier ----
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// writes are now done and all writes use timestamp alias_ts
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if alias.state.get() == &Some(bucket_id) {
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alias.state = Lww::raw(alias_ts, None);
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self.0.bucket_alias_table.insert(&alias).await?;
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}
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if let Some(mut bucket_state) = bucket.state.as_option_mut() {
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bucket_state.aliases = LwwMap::raw_item(alias_name.clone(), alias_ts, false);
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self.0.bucket_table.insert(&bucket).await?;
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}
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Ok(())
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}
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/// Sets a new alias for a bucket in the local namespace of a key.
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/// This function fails if:
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/// - alias name is not valid according to S3 spec
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/// - bucket does not exist or is deleted
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/// - key does not exist or is deleted
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/// - alias already exists and points to another bucket
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pub async fn set_local_bucket_alias(
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&self,
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bucket_id: Uuid,
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key_id: &String,
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alias_name: &String,
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) -> Result<(), Error> {
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if !is_valid_bucket_name(alias_name) {
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return Err(Error::BadRequest(format!(
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"{}: {}",
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alias_name, INVALID_BUCKET_NAME_MESSAGE
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)));
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}
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let mut bucket = self.get_existing_bucket(bucket_id).await?;
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let mut key = self.get_existing_key(key_id).await?;
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let mut key_param = key.state.as_option_mut().unwrap();
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if let Some(Some(existing_alias)) = key_param.local_aliases.get(alias_name) {
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if *existing_alias != bucket_id {
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return Err(Error::BadRequest(format!("Alias {} already exists in namespace of key {} and points to different bucket: {:?}", alias_name, key.key_id, existing_alias)));
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}
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}
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// Checks ok, add alias
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let mut bucket_p = bucket.state.as_option_mut().unwrap();
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let bucket_p_local_alias_key = (key.key_id.clone(), alias_name.clone());
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// Calculate the timestamp to assign to this aliasing in the two local_aliases maps
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// (the one from key to bucket, and the reverse one stored in the bucket iself)
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// so that merges on both maps in case of a concurrent operation resolve
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// to the same alias being set
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let alias_ts = increment_logical_clock_2(
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key_param.local_aliases.get_timestamp(alias_name),
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bucket_p
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.local_aliases
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.get_timestamp(&bucket_p_local_alias_key),
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);
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// ---- timestamp-ensured causality barrier ----
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// writes are now done and all writes use timestamp alias_ts
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key_param.local_aliases = LwwMap::raw_item(alias_name.clone(), alias_ts, Some(bucket_id));
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self.0.key_table.insert(&key).await?;
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bucket_p.local_aliases = LwwMap::raw_item(bucket_p_local_alias_key, alias_ts, true);
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self.0.bucket_table.insert(&bucket).await?;
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Ok(())
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}
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/// Unsets an alias for a bucket in the local namespace of a key.
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/// This function fails if:
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/// - bucket does not exist or is deleted
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/// - key does not exist or is deleted
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/// - alias does not exist or maps to another bucket (-> internal error)
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/// - bucket has no other aliases (global or local)
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pub async fn unset_local_bucket_alias(
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&self,
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bucket_id: Uuid,
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key_id: &String,
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alias_name: &String,
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) -> Result<(), Error> {
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let mut bucket = self.get_existing_bucket(bucket_id).await?;
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let mut key = self.get_existing_key(key_id).await?;
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let mut bucket_p = bucket.state.as_option_mut().unwrap();
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if key
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.state
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.as_option()
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.unwrap()
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.local_aliases
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.get(alias_name)
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.cloned()
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.flatten() != Some(bucket_id)
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{
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return Err(GarageError::Message(format!(
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"Bucket {:?} does not have alias {} in namespace of key {}",
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bucket_id, alias_name, key_id
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))
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.into());
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}
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let has_other_global_aliases = bucket_p
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.aliases
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.items()
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.iter()
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.any(|(_, _, active)| *active);
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let has_other_local_aliases = bucket_p
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.local_aliases
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.items()
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.iter()
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.any(|((k, n), _, active)| *k == key.key_id && n == alias_name && *active);
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if !has_other_global_aliases && !has_other_local_aliases {
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return Err(Error::BadRequest(format!("Bucket {} doesn't have other aliases, please delete it instead of just unaliasing.", alias_name)));
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}
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// Checks ok, remove alias
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let mut key_param = key.state.as_option_mut().unwrap();
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let bucket_p_local_alias_key = (key.key_id.clone(), alias_name.clone());
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let alias_ts = increment_logical_clock_2(
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key_param.local_aliases.get_timestamp(alias_name),
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bucket_p
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.local_aliases
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.get_timestamp(&bucket_p_local_alias_key),
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);
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// ---- timestamp-ensured causality barrier ----
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// writes are now done and all writes use timestamp alias_ts
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key_param.local_aliases = LwwMap::raw_item(alias_name.clone(), alias_ts, None);
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self.0.key_table.insert(&key).await?;
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bucket_p.local_aliases = LwwMap::raw_item(bucket_p_local_alias_key, alias_ts, false);
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self.0.bucket_table.insert(&bucket).await?;
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Ok(())
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}
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/// Sets permissions for a key on a bucket.
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/// This function fails if:
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/// - bucket or key cannot be found at all (its ok if they are in deleted state)
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/// - bucket or key is in deleted state and we are trying to set permissions other than "deny
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/// all"
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pub async fn set_bucket_key_permissions(
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&self,
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bucket_id: Uuid,
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key_id: &String,
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mut perm: BucketKeyPerm,
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) -> Result<(), Error> {
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let mut bucket = self.get_internal_bucket(bucket_id).await?;
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let mut key = self.get_internal_key(key_id).await?;
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let allow_any = perm.allow_read || perm.allow_write || perm.allow_owner;
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if let Some(bstate) = bucket.state.as_option() {
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if let Some(kp) = bstate.authorized_keys.get(key_id) {
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perm.timestamp = increment_logical_clock_2(perm.timestamp, kp.timestamp);
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}
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} else if allow_any {
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return Err(Error::BadRequest(
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"Trying to give permissions on a deleted bucket".into(),
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));
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}
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if let Some(kstate) = key.state.as_option() {
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if let Some(bp) = kstate.authorized_buckets.get(&bucket_id) {
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perm.timestamp = increment_logical_clock_2(perm.timestamp, bp.timestamp);
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}
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} else if allow_any {
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return Err(Error::BadRequest(
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"Trying to give permissions to a deleted key".into(),
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));
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}
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// ---- timestamp-ensured causality barrier ----
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if let Some(bstate) = bucket.state.as_option_mut() {
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bstate.authorized_keys = Map::put_mutator(key_id.clone(), perm);
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self.0.bucket_table.insert(&bucket).await?;
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}
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if let Some(kstate) = key.state.as_option_mut() {
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kstate.authorized_buckets = Map::put_mutator(bucket_id, perm);
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self.0.key_table.insert(&key).await?;
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}
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Ok(())
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}
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}
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