static post suspend works

src/post/mod.rs

@@ -20,6 +20,20 @@ pub struct PostTimestamp
     pub last_edit: DateTime<Utc>,
 }
 
+impl PostTimestamp
+{
+    /// Create a new timestamp for a new post
+    pub fn new() -> Self
+    {
+	let now = Utc::now();
+	Self {
+	    opened: now.clone(),
+	    closed: None,
+	    last_edit: now,
+	}
+    }
+}
+
 impl Hash for PostTimestamp {
     fn hash<H: Hasher>(&self, state: &mut H) {
 	self.opened.hash(state);
@@ -61,6 +75,26 @@ pub struct Static
     hash: crypto::sha256::Sha256Hash,
 }
 
+impl Static
+{
+    /// Compute the hash for this instance
+    pub fn into_hashed(mut self) -> Self
+    {
+	self.hash = Default::default();
+	let bytes = serde_cbor::to_vec(&self).expect("Failed to serialise static post to CBOR");
+	Self {
+	    hash: crypto::sha256::compute_slice(&bytes),
+	    ..self
+	}
+    }
+
+    /// Validate the internal hash of this instance
+    pub fn validate_hash(&self) -> bool
+    {
+	self.clone().into_hashed().hash == self.hash
+    }
+}
+
 use suspend::{
     Suspendable,
     SuspendStream,
@@ -81,3 +115,42 @@ impl Suspendable for Static
 	input.try_get("post-static").ok_or(suspend::Error::BadObject)
     }
 }
+
+#[cfg(test)]
+mod tests
+{
+    use super::*;
+    #[tokio::test]
+    async fn static_post_ser()
+    {
+	let mut output = suspend::MemorySsuspendStream::new();
+	let post1 = Static {
+	    id: identity::PostID::new(),
+	    user: Default::default(),
+	    title: None,
+	    karada: "hello world".to_owned(),
+	    timestamp: PostTimestamp::new(),
+	    hash: Default::default(),
+	}.into_hashed();
+	
+	let post1c = post1.clone();
+	assert!(post1.validate_hash());
+	post1.suspend(&mut output).await.expect("Suspend failed");
+
+	let buffer = output.buffer().clone();
+	let post2 = Static::load(&mut output).await.expect("Suspend load failed");
+
+	assert_eq!(post1c, post2);
+	assert!(post1c.validate_hash());
+	assert!(post2.validate_hash());
+
+	let buffer2 = suspend::oneshot(post2.clone()).await.expect("Oneshot failed");
+
+	assert_eq!(&buffer2[..], &buffer[..]);
+
+	let post3: Static = suspend::single(buffer2).await.expect("Single failed");
+
+	assert!(post3.validate_hash());
+	assert_eq!(post3, post2);
+    }
+}

src/suspend.rs

@@ -70,7 +70,7 @@ impl Object
 	}
 	true
     }
-	
+    
     /// Try to get a value of type `T` from `name`.
     pub fn get<'a, T>(&'a mut self, name: impl Borrow<str>) -> Option<T>
     where T: Deserialize<'a>
@@ -165,26 +165,47 @@ impl Object
     }
 
     /// Consume into the data
-    #[deprecated = "Invalid ABI"] fn into_bytes(self) -> Box<[u8]>
+    pub fn into_bytes(self) -> Box<[u8]>
     {
 	let mut output = Vec::new(); //TOOO: Get cap
 
 	debug_assert!(self.validate(), "passing invalid object to serialise");
 
-	unsafe {
-	    output.extend_from_slice(bytes::refer(&self.data_instances.len()));
-	    for (name, Range{start, end}) in self.data_instances.into_iter() {
-		let name = name.as_bytes();
+	macro_rules! bin {
+	    ($bytes:expr) => {
+		{
+		    let bytes = $bytes;
+		    output.extend_from_slice(bytes.as_ref());
+		}
+	    };
+	    (usize $value:expr) => {
+		{
+		    use std::convert::TryInto;
+		    use byteorder::{
+			WriteBytesExt,
+			LittleEndian,
+		    };
+		    let val: u64 = $value.try_into().expect("Value could not fit into `u64`");
+		    WriteBytesExt::write_u64::<LittleEndian>(&mut output,val).expect("Failed to append `u64` to output buffer");
+		    
+		}
+	    };
+	}
 
-		output.extend_from_slice(bytes::refer(&name.len()));
-		output.extend_from_slice(name);
+	bin!(usize self.data_instances.len());
+	for (name, &Range{start, end}) in self.data_instances.iter() {
+	    let name = name.as_bytes();
 
-		output.extend_from_slice(bytes::refer(&start));
-		output.extend_from_slice(bytes::refer(&end));
-	    }
+	    bin!(usize name.len());
+	    bin!(name);
+
+	    bin!(usize start);
+	    bin!(usize end);
 	}
-	
+
+	bin!(usize self.data.len()); //for additional checks
 	output.extend(self.data);
+
 	output.into_boxed_slice()
     }
 
@@ -329,6 +350,14 @@ impl fmt::Display for Error
     }
 }
 
+impl From<io::Error> for Error
+{
+    #[inline] fn from(from: io::Error) -> Self
+    {
+	Self::IO(from)
+    }
+}
+
 
 /// A suspendable type, that can save and reload its data atomically
 #[async_trait]
@@ -338,11 +367,154 @@ pub trait Suspendable: Sized
     async fn load<S: SuspendStream + Send+ Sync+?Sized>(from: &mut S) -> Result<Self, Error>;
 }
 
+/// An in-memory `SuspendStream`.
+#[derive(Debug, Clone)]
+pub struct MemorySsuspendStream(Vec<u8>);
+
+impl MemorySsuspendStream
+{
+    /// Create a new empty instance
+    pub fn new() -> Self
+    {
+	Self(Vec::new())
+    }
+
+    /// Create from a vector of bytes
+    pub fn from_bytes(from: impl Into<Vec<u8>>) -> Self
+    {
+	Self(from.into())
+    }
+
+    /// Create from a slice of bytes
+    pub fn from_slice(from: impl AsRef<[u8]>) -> Self
+    {
+	Self(Vec::from(from.as_ref()))
+    }
+
+    /// Return the internal bytes
+    pub fn into_bytes(self) -> Vec<u8>
+    {
+	self.0
+    }
+
+    /// The internal buffer
+    pub fn buffer(&self) -> &Vec<u8>
+    {
+	&self.0
+    }
+    
+    /// The internal buffer
+    pub fn buffer_mut(&mut self) -> &mut Vec<u8>
+    {
+	&mut self.0
+    }
+
+}
+
+impl AsRef<[u8]> for MemorySsuspendStream
+{
+    fn as_ref(&self) -> &[u8]
+    {
+	&self.0[..]
+    }
+}
+
+impl AsMut<[u8]> for MemorySsuspendStream
+{
+    fn as_mut(&mut self) -> &mut [u8]
+    {
+	&mut self.0[..]
+    }
+}
+
+impl From<Vec<u8>> for MemorySsuspendStream
+{
+    #[inline] fn from(from: Vec<u8>) -> Self
+    {
+	Self(from.into())
+    }
+}
+
+impl From<Box<[u8]>> for MemorySsuspendStream
+{
+    fn from(from: Box<[u8]>) -> Self
+    {
+	Self::from_bytes(from)
+    }
+}
+
+impl From<MemorySsuspendStream> for Box<[u8]>
+{
+    fn from(from: MemorySsuspendStream) -> Self
+    {
+	from.0.into()
+    }
+}
+
+impl From<MemorySsuspendStream> for Vec<u8>
+{
+    #[inline] fn from(from: MemorySsuspendStream) -> Self
+    {
+	from.0
+    }
+}
+
+#[async_trait]
+impl SuspendStream for MemorySsuspendStream
+{
+    async fn get_object(&mut self) -> Result<Option<Object>, Error> {
+	if self.0.len() ==0 {
+	    return Ok(None);
+	}
+	
+	let mut ptr = &self.0[..];
+	let vl = Object::from_stream(&mut ptr).await?;
+	let diff = (ptr.as_ptr() as usize) - ((&self.0[..]).as_ptr() as usize);
+	self.0.drain(0..diff);
+
+	Ok(Some(vl))
+    }
+    async fn set_object(&mut self, obj: Object) -> Result<(), Error> {
+	obj.into_stream(&mut self.0).await?;
+	Ok(())
+    }
+}
 
-/*
-pub struct SuspenceState<T>
-where T: Suspendable
+/// Suspend a single object to memory
+pub async fn oneshot<T: Suspendable>(value: T) -> Result<Vec<u8>, Error>
 {
+    let mut output = MemorySsuspendStream::new();
+    value.suspend(&mut output).await?;
+    Ok(output.into_bytes())
+}
 
-_phantom: PhantomData<T>,
-}*/
+/// Load a single value from memory
+pub async fn single<T: Suspendable>(from: impl AsRef<[u8]>) -> Result<T, Error>
+{
+    struct BorrowedStream<'a>(&'a [u8]);
+
+    #[async_trait]
+    impl<'a> SuspendStream for BorrowedStream<'a>
+    {
+	async fn get_object(&mut self) -> Result<Option<Object>, Error> {
+	    if self.0.len() ==0 {
+		return Ok(None);
+	    }
+	    
+	    let mut ptr = &self.0[..];
+	    let vl = Object::from_stream(&mut ptr).await?;
+	    let diff = (ptr.as_ptr() as usize) - ((&self.0[..]).as_ptr() as usize);
+	    self.0 = &self.0[diff..];
+
+	    Ok(Some(vl))
+	}
+	async fn set_object(&mut self, _: Object) -> Result<(), Error> {
+	    panic!("Cannot write to borrowed stream")
+	}
+    }
+
+    let bytes = from.as_ref();
+    let mut stream = BorrowedStream(bytes);
+
+    T::load(&mut stream).await
+}