example to ensure structs are send

Cargo.toml

@@ -25,7 +25,7 @@ failure = "0.1.5"
 flat-tree = "4.1.0"
 lazy_static = "1.3.0"
 memory-pager = "0.9.0"
-merkle-tree-stream = "0.10.0"
+merkle-tree-stream = { version = "0.10.0", git = "https://github.com/bltavares/merkle-tree-stream", branch = "send" }
 pretty-hash = "0.4.0"
 rand = "0.6.0"
 random-access-disk = "0.8.0"
@@ -41,3 +41,4 @@ quickcheck = "0.8.5"
 data-encoding = "2.1.2"
 remove_dir_all = "0.5.2"
 tempfile = "3.1.0"
+async-std = "1.5.0"

examples/async.rs

@@ -0,0 +1,30 @@
+use async_std::task;
+use failure::Error;
+use hypercore::Feed;
+use random_access_storage::RandomAccess;
+use std::fmt::Debug;
+
+async fn append<T>(feed: &mut Feed<T>, content: &[u8])
+where
+    T: RandomAccess<Error = Error> + Debug,
+{
+    feed.append(content).unwrap();
+}
+
+async fn print<T>(feed: &mut Feed<T>)
+where
+    T: RandomAccess<Error = Error> + Debug,
+{
+    println!("{:?}", feed.get(0));
+    println!("{:?}", feed.get(1));
+}
+
+fn main() {
+    task::block_on(task::spawn(async {
+        let mut feed = Feed::default();
+
+        append(&mut feed, b"hello").await;
+        append(&mut feed, b"world").await;
+        print(&mut feed).await;
+    }));
+}

src/crypto/merkle.rs

@@ -1,7 +1,7 @@
 use crate::crypto::Hash;
 use crate::storage::Node;
 use merkle_tree_stream::{HashMethods, MerkleTreeStream, NodeKind, PartialNode};
-use std::rc::Rc;
+use std::sync::Arc;
 
 #[derive(Debug)]
 struct H;
@@ -10,7 +10,7 @@ impl HashMethods for H {
     type Node = Node;
     type Hash = Hash;
 
-    fn leaf(&self, leaf: &PartialNode, _roots: &[Rc<Self::Node>]) -> Self::Hash {
+    fn leaf(&self, leaf: &PartialNode, _roots: &[Arc<Self::Node>]) -> Self::Hash {
         match leaf.data() {
             NodeKind::Leaf(data) => Hash::from_leaf(&data),
             NodeKind::Parent => unreachable!(),
@@ -26,7 +26,7 @@ impl HashMethods for H {
 #[derive(Debug)]
 pub struct Merkle {
     stream: MerkleTreeStream<H>,
-    nodes: Vec<Rc<Node>>,
+    nodes: Vec<Arc<Node>>,
 }
 
 impl Default for Merkle {
@@ -52,12 +52,12 @@ impl Merkle {
     }
 
     /// Get the roots vector.
-    pub fn roots(&self) -> &Vec<Rc<Node>> {
+    pub fn roots(&self) -> &Vec<Arc<Node>> {
         self.stream.roots()
     }
 
     /// Get the nodes from the struct.
-    pub fn nodes(&self) -> &Vec<Rc<Node>> {
+    pub fn nodes(&self) -> &Vec<Arc<Node>> {
         &self.nodes
     }
 }

src/feed.rs

@@ -23,7 +23,7 @@ use std::cmp;
 use std::fmt::{self, Debug, Display};
 use std::ops::Range;
 use std::path::Path;
-use std::rc::Rc;
+use std::sync::Arc;
 
 /// Append-only log structure.
 #[derive(Debug)]
@@ -398,7 +398,7 @@ where
     /// root nodes combined.
     pub fn verify(&mut self, index: usize, signature: &Signature) -> Result<()> {
         let roots = self.root_hashes(index)?;
-        let roots: Vec<_> = roots.into_iter().map(Rc::new).collect();
+        let roots: Vec<_> = roots.into_iter().map(Arc::new).collect();
 
         let message = Hash::from_roots(&roots);
         let message = message.as_bytes();