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use std::{collections::HashMap, sync::Arc};
use crate::{
chaincode::{Callable, Metadata, context::Context, message::MessageBuilder, router::Router},
fabric::{
common::Status,
protos::{ChaincodeId, ChaincodeInput, ChaincodeMessage, Response, chaincode_message},
},
};
use futures_channel::mpsc::Receiver;
use futures_util::StreamExt;
use prost::Message;
use tokio::sync::Mutex;
///Handles messages incoming from the peer. Also registers itself to the peer
pub struct MessageHandler {
///Contract registered by this chaincode
contracts: HashMap<String, HashMap<String, Box<dyn Callable>>>,
///Helper struct to generate messages to the peer
message_builder: Arc<Mutex<MessageBuilder>>,
chaincode_id: ChaincodeId,
transaction_queue: Receiver<ChaincodeMessage>,
peer_response_queue: Arc<Mutex<Receiver<ChaincodeMessage>>>,
}
impl MessageHandler {
pub async fn new(
metadata: &Metadata,
chaincode_id: ChaincodeId,
contracts: HashMap<String, HashMap<String, Box<dyn Callable>>>,
) -> MessageHandler {
let (tx, rx) = futures_channel::mpsc::channel::<ChaincodeMessage>(100);
let (transaction_queue_sender, transaction_queue_receiver) =
futures_channel::mpsc::channel(100);
let (peer_response_sender, peer_response_receiver) = futures_channel::mpsc::channel(100);
let router =
Router::new(metadata, transaction_queue_sender, peer_response_sender, rx).await;
tokio::spawn(async move {
eprintln!("[Router] Starting router");
router.run().await;
eprintln!("[Router] Router stopped");
});
let mut message_builder = MessageBuilder::new(metadata, tx);
eprintln!("Current state is CREATED");
//Register this chaincode to the peer. This needs to be the very first message
message_builder
.send(
chaincode_message::Type::Register,
metadata.chaincode_id.encode_to_vec(),
)
.await;
let message_builder = Arc::new(Mutex::new(message_builder));
MessageHandler {
contracts,
message_builder,
chaincode_id,
transaction_queue: transaction_queue_receiver,
peer_response_queue: Arc::new(Mutex::new(peer_response_receiver)),
}
}
pub async fn run(mut self) {
while let Some(message) = self.transaction_queue.next().await {
eprintln!("[MessageHandler] Executing transaction {}", message.txid);
match ChaincodeInput::decode(message.payload.as_slice()) {
Ok(input) => {
//structname:functionname,arg1,arg2,arg3
//First argument is the contract:function
let arg_iter = input.args.iter();
let arguments = arg_iter
.map(|f| {
String::from_utf8(f.clone())
.expect("[MessageHandler] Invalid UTF-8 encoding")
})
.collect::<Vec<String>>();
let contract_function = arguments
.first()
.expect("[MessageHandler] Expected first argument but found nothing")
.split(":")
.collect::<Vec<&str>>();
let contract_name = if contract_function.len() > 1 {
contract_function
.first()
.expect("[MessageHandler] Expected contract_name but found nothing")
} else {
""
};
let function_name = contract_function
.last()
.expect("[MessageHandler] Expected function_name but found nothing");
let response = match self.contracts.get(contract_name) {
Some(contract) => match contract.get(*function_name) {
Some(function) => {
match function
.call(
Context::new(
self.message_builder.clone(),
message.clone(),
self.peer_response_queue.clone(),
),
arguments.iter().skip(1).cloned().collect::<Vec<String>>(),
)
.await
{
Ok(result) => match result {
Ok(message) => Response {
status: Status::Success.into(),
message: String::default(),
payload: message.as_bytes().to_vec(),
},
Err(err) => Response {
status: Status::InternalServerError.into(),
message: format!(
"An error occurred during the exection of the chaincode function: {err}"
),
payload: vec![],
},
},
Err(err) => Response {
status: Status::InternalServerError.into(),
message: format!(
"An error occurred during the exection of the chaincode function: {err}"
),
payload: vec![],
},
}
}
None => Response {
status: Status::NotFound.into(),
message: format!(
"Function {function_name} not found in contract {contract_name} from chaincode {}",
self.chaincode_id.name
),
payload: vec![],
},
},
None => Response {
status: Status::NotFound.into(),
message: format!(
"Contract {contract_name} not found in chaincode {}",
self.chaincode_id.name
),
payload: vec![],
},
};
self.message_builder
.lock()
.await
.respond(
chaincode_message::Type::Completed,
response.encode_to_vec(),
message,
)
.await;
}
Err(err) => {
let error_text = format!("Invalid chaincode input; {}", err);
eprintln!("[MessageHandler] {}", error_text);
self.message_builder
.lock()
.await
.send(chaincode_message::Type::Error, error_text.encode_to_vec())
.await;
self.message_builder
.lock()
.await
.send(
chaincode_message::Type::Response,
error_text.encode_to_vec(),
)
.await;
}
}
}
eprintln!("[MessageHandler] Channel closed")
}
}