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use backtrace::Backtrace;
use crate::error::HolochainError;
use base64;
use serde::{
self,
de::{Deserializer, Visitor},
ser::Serializer,
};
use std::{
fmt,
hash::{Hash, Hasher},
ops::Deref,
sync::{Arc, RwLock},
};
use wasmi::Module;
#[derive(Clone)]
pub struct ModuleArc(Arc<Module>);
impl ModuleArc {
pub fn new(module: Module) -> Self {
ModuleArc(Arc::new(module))
}
}
impl PartialEq for ModuleArc {
fn eq(&self, _other: &ModuleArc) -> bool {
false
}
}
impl Eq for ModuleArc {}
impl Deref for ModuleArc {
type Target = Arc<Module>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl fmt::Debug for ModuleArc {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "ModuleMutex")
}
}
fn _vec_u8_to_b64_str<S>(data: &Arc<Vec<u8>>, s: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let b64 = base64::encode(data.as_ref());
s.serialize_str(&b64)
}
fn _b64_str_to_vec_u8<'de, D>(d: D) -> Result<Arc<Vec<u8>>, D::Error>
where
D: Deserializer<'de>,
{
struct Z;
impl<'de> Visitor<'de> for Z {
type Value = Vec<u8>;
fn expecting(&self, formatter: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
formatter.write_str("string")
}
fn visit_str<E>(self, value: &str) -> Result<Vec<u8>, E>
where
E: serde::de::Error,
{
match base64::decode(value) {
Ok(v) => Ok(v),
Err(e) => Err(serde::de::Error::custom(e)),
}
}
}
Ok(Arc::new(d.deserialize_any(Z)?))
}
#[derive(Serialize, Deserialize, Clone)]
pub struct DnaWasm {
#[serde(
serialize_with = "_vec_u8_to_b64_str",
deserialize_with = "_b64_str_to_vec_u8"
)]
pub code: Arc<Vec<u8>>,
#[serde(skip, default = "empty_module")]
module: Arc<RwLock<Option<ModuleArc>>>,
}
impl DnaWasm {
pub fn new_invalid() -> Self {
debug!(
"DnaWasm::new_invalid() called from:\n{:?}",
Backtrace::new()
);
DnaWasm {
code: Arc::new(vec![]),
module: empty_module(),
}
}
}
fn empty_module() -> Arc<RwLock<Option<ModuleArc>>> {
Arc::new(RwLock::new(None))
}
impl fmt::Debug for DnaWasm {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "<<<DNA WASM CODE>>>")
}
}
impl PartialEq for DnaWasm {
fn eq(&self, other: &DnaWasm) -> bool {
self.code == other.code
}
}
impl Hash for DnaWasm {
fn hash<H: Hasher>(&self, state: &mut H) {
self.code.hash(state);
}
}
impl DnaWasm {
pub fn from_bytes(wasm: Vec<u8>) -> Self {
DnaWasm {
code: Arc::new(wasm),
module: empty_module(),
}
}
pub fn get_wasm_module(&self) -> Result<ModuleArc, HolochainError> {
if self.module.read().unwrap().is_none() {
self.create_module()?;
}
Ok(self.module.read().unwrap().as_ref().unwrap().clone())
}
fn create_module(&self) -> Result<(), HolochainError> {
let module = wasmi::Module::from_buffer(&*self.code).map_err(|e| {
debug!(
"DnaWasm could not create a wasmi::Module from code bytes! Error: {:?}",
e
);
debug!("Unparsable bytes: {:?}", *self.code);
HolochainError::ErrorGeneric(e.into())
})?;
let module_arc = ModuleArc::new(module);
let mut lock = self.module.write().unwrap();
*lock = Some(module_arc);
Ok(())
}
}