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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,160 +1,25 @@ | ||
| use crate::blockchain::Ref; | ||
| use futures::stream::{FuturesUnordered, StreamExt}; | ||
| use std::sync::Arc; | ||
| use tokio::sync::RwLock; | ||
|
|
||
| #[derive(Clone)] | ||
| pub struct Branches { | ||
| inner: Arc<RwLock<BranchesData>>, | ||
| } | ||
|
|
||
| struct BranchesData { | ||
| branches: Vec<Branch>, | ||
| } | ||
|
|
||
| /// the data that is contained in a branch | ||
| #[derive(Clone)] | ||
| pub struct Branch { | ||
| inner: Arc<RwLock<BranchData>>, | ||
| } | ||
|
|
||
| /// the data that is contained in a branch | ||
| struct BranchData { | ||
| /// reference to the block where the branch points to | ||
| reference: Arc<Ref>, | ||
| } | ||
|
|
||
| impl Default for Branches { | ||
| fn default() -> Self { | ||
| Self::new() | ||
| } | ||
| } | ||
|
|
||
| impl Branches { | ||
| pub fn new() -> Self { | ||
| Branches { | ||
| inner: Arc::new(RwLock::new(BranchesData { | ||
| branches: Vec::new(), | ||
| })), | ||
| } | ||
| } | ||
|
|
||
| pub async fn add(&mut self, branch: Branch) { | ||
| let mut guard = self.inner.write().await; | ||
| guard.add(branch); | ||
| } | ||
|
|
||
| pub async fn apply_or_create(&mut self, candidate: Arc<Ref>) -> Branch { | ||
| let maybe_branch = self.apply(Arc::clone(&candidate)).await; | ||
| match maybe_branch { | ||
| Some(branch) => branch, | ||
| None => { | ||
| let maybe_exists = self | ||
| .branches() | ||
| .await | ||
| .into_iter() | ||
| .find(|branch| branch.hash() == candidate.hash()); | ||
|
|
||
| if let Some(branch) = maybe_exists { | ||
| return Branch::new(branch); | ||
| } | ||
| self.create(candidate).await | ||
| } | ||
| } | ||
| } | ||
|
|
||
| pub async fn branches(&self) -> Vec<Arc<Ref>> { | ||
| let guard = self.inner.read().await; | ||
| guard.branches().await | ||
| } | ||
|
|
||
| async fn apply(&mut self, candidate: Arc<Ref>) -> Option<Branch> { | ||
| let mut guard = self.inner.write().await; | ||
| guard.apply(candidate).await | ||
| } | ||
|
|
||
| async fn create(&mut self, candidate: Arc<Ref>) -> Branch { | ||
| let branch = Branch::new(candidate); | ||
| self.add(branch.clone()).await; | ||
| branch | ||
| } | ||
| } | ||
|
|
||
| impl BranchesData { | ||
| fn add(&mut self, branch: Branch) { | ||
| self.branches.push(branch) | ||
| } | ||
|
|
||
| async fn apply(&mut self, candidate: Arc<Ref>) -> Option<Branch> { | ||
| let (value, _) = self | ||
| .branches | ||
| .iter_mut() | ||
| .map(|branch| branch.continue_with(Arc::clone(&candidate))) | ||
| .collect::<FuturesUnordered<_>>() | ||
| .filter_map(|updated| Box::pin(async move { updated })) | ||
| .into_future() | ||
| .await; | ||
| value | ||
| } | ||
|
|
||
| async fn branches(&self) -> Vec<Arc<Ref>> { | ||
| self.branches | ||
| .iter() | ||
| .map(|b| b.get_ref()) | ||
| // this is done so that inner futures are only polled when they generate wake-up notifications | ||
| .collect::<FuturesUnordered<_>>() | ||
| .collect() | ||
| .await | ||
| } | ||
| } | ||
|
|
||
| impl Branch { | ||
| pub fn new(reference: Arc<Ref>) -> Self { | ||
| Branch { | ||
| inner: Arc::new(RwLock::new(BranchData::new(reference))), | ||
| } | ||
| } | ||
|
|
||
| pub async fn get_ref(&self) -> Arc<Ref> { | ||
| let guard = self.inner.read().await; | ||
| guard.reference() | ||
| } | ||
|
|
||
| pub async fn update_ref(&mut self, new_ref: Arc<Ref>) -> Arc<Ref> { | ||
| let mut guard = self.inner.write().await; | ||
| guard.update(new_ref) | ||
| } | ||
|
|
||
| async fn continue_with(&mut self, candidate: Arc<Ref>) -> Option<Self> { | ||
| let mut guard = self.inner.write().await; | ||
| if guard.continue_with(candidate) { | ||
| Some(self.clone()) | ||
| } else { | ||
| None | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl BranchData { | ||
| /// create the branch data with the current `last_updated` to | ||
| /// the current time this function was called | ||
| fn new(reference: Arc<Ref>) -> Self { | ||
| BranchData { reference } | ||
| } | ||
|
|
||
| fn update(&mut self, reference: Arc<Ref>) -> Arc<Ref> { | ||
| std::mem::replace(&mut self.reference, reference) | ||
| pub fn new(reference: Arc<Ref>) -> Self { | ||
| Branch { reference } | ||
| } | ||
|
|
||
| fn reference(&self) -> Arc<Ref> { | ||
| pub fn get_ref(&self) -> Arc<Ref> { | ||
| Arc::clone(&self.reference) | ||
| } | ||
|
|
||
| fn continue_with(&mut self, candidate: Arc<Ref>) -> bool { | ||
| if self.reference.hash() == candidate.block_parent_hash() { | ||
| let _parent = self.update(candidate); | ||
| true | ||
| } else { | ||
| false | ||
| } | ||
| pub fn into_ref(self) -> Arc<Ref> { | ||
| self.reference | ||
| } | ||
| } |
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