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use std::fmt;
use async_trait::async_trait;
use bytes::Bytes;
use log::debug;
use safecast::{CastFrom, TryCastFrom};
use tc_error::*;
use tc_transact::fs::File;
use tc_transact::{Transact, TxnId};
use tc_value::Value;
use tcgeneric::*;
use crate::fs;
use crate::scalar::OpRef;
use crate::state::State;
mod block;
mod sync;
pub use block::ChainBlock;
pub use sync::*;
const CHAIN: Label = label("chain");
const PREFIX: PathLabel = path_label(&["state", "chain"]);
const SUBJECT: Label = label("subject");
pub const EXT: &str = "chain";
#[derive(Clone)]
pub enum Schema {
Value(Value),
}
impl CastFrom<Value> for Schema {
fn cast_from(value: Value) -> Self {
Self::Value(value)
}
}
#[derive(Clone)]
pub enum Subject {
Value(fs::File<Bytes>),
}
impl Subject {
pub async fn at(&self, txn_id: &TxnId) -> TCResult<State> {
debug!("Subject::at {}", txn_id);
match self {
Self::Value(file) => {
let block_id = SUBJECT.into();
let block = file.get_block(txn_id, &block_id).await?;
let value: Value = serde_json::from_slice(&block)
.map_err(|e| TCError::internal(format!("block corrupted! {}", e)))?;
Ok(value.into())
}
}
}
pub async fn put(&self, txn_id: &TxnId, key: Value, value: State) -> TCResult<()> {
match self {
Self::Value(file) => {
if key.is_some() {
return Err(TCError::bad_request("Value has no such property", key));
}
let new_value = Value::try_cast_from(value, |v| {
TCError::bad_request("cannot update a Value to", v)
})?;
let new_json = serde_json::to_string(&new_value)
.map_err(|e| TCError::bad_request("error serializing Value", e))?;
let block_id = SUBJECT.into();
let mut block = file.get_block_mut(txn_id, &block_id).await?;
debug!(
"set new Value of chain subject to {} ({}) at {}",
new_value, new_json, txn_id
);
*block = Bytes::from(new_json);
Ok(())
}
}
}
}
#[async_trait]
impl Transact for Subject {
async fn commit(&self, txn_id: &TxnId) {
debug!(
"commit subject with value {} at {}",
self.at(txn_id).await.unwrap(),
txn_id
);
match self {
Self::Value(file) => file.commit(txn_id).await,
}
}
async fn finalize(&self, txn_id: &TxnId) {
match self {
Self::Value(file) => file.finalize(txn_id).await,
}
}
}
#[async_trait]
pub trait ChainInstance {
async fn append(&self, txn_id: &TxnId, op_ref: OpRef) -> TCResult<()>;
fn subject(&self) -> &Subject;
}
#[derive(Clone, Copy, Eq, PartialEq)]
pub enum ChainType {
Sync,
}
impl Class for ChainType {
type Instance = Chain;
}
impl NativeClass for ChainType {
fn from_path(path: &[PathSegment]) -> Option<Self> {
if path.len() == 3 && &path[0..2] == &PREFIX[..] {
match path[2].as_str() {
"sync" => Some(Self::Sync),
_ => None,
}
} else {
None
}
}
fn path(&self) -> TCPathBuf {
let suffix = match self {
Self::Sync => "sync",
};
TCPathBuf::from(PREFIX).append(label(suffix))
}
}
impl fmt::Display for ChainType {
fn fmt(&self, _f: &mut fmt::Formatter) -> fmt::Result {
unimplemented!()
}
}
#[derive(Clone)]
pub enum Chain {
Sync(sync::SyncChain),
}
impl Instance for Chain {
type Class = ChainType;
fn class(&self) -> Self::Class {
match self {
Self::Sync(_) => ChainType::Sync,
}
}
}
#[async_trait]
impl ChainInstance for Chain {
async fn append(&self, txn_id: &TxnId, op_ref: OpRef) -> TCResult<()> {
match self {
Self::Sync(chain) => chain.append(txn_id, op_ref).await,
}
}
fn subject(&self) -> &Subject {
match self {
Self::Sync(chain) => chain.subject(),
}
}
}
#[async_trait]
impl Transact for Chain {
async fn commit(&self, txn_id: &TxnId) {
match self {
Self::Sync(chain) => chain.commit(txn_id).await,
}
}
async fn finalize(&self, txn_id: &TxnId) {
match self {
Self::Sync(chain) => chain.finalize(txn_id).await,
}
}
}
impl fmt::Display for Chain {
fn fmt(&self, _f: &mut fmt::Formatter) -> fmt::Result {
unimplemented!()
}
}