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use anyhow::Result;
use diem_client::{views::EventView, Client};
use diem_types::{
account_address::AccountAddress,
account_state::AccountState,
account_state_blob::AccountStateBlob,
event::{EventHandle, EventKey},
};
use futures::future::join_all;
use std::convert::TryFrom;
const BATCH_SIZE: u64 = 500;
pub struct DiemEventsFetcher(Client);
impl DiemEventsFetcher {
pub fn new(url: &str) -> Result<Self> {
Ok(Self(Client::new(url)))
}
async fn get_account_state(&self, account: AccountAddress) -> Result<Option<AccountState>> {
let account_state: AccountStateBlob = {
let blob = self
.0
.get_account_state_with_proof(account, None, None)
.await?
.into_inner()
.blob
.ok_or_else(|| anyhow::anyhow!("missing account state blob"))?;
bcs::from_bytes(&blob)?
};
Ok(Some(AccountState::try_from(&account_state)?))
}
pub async fn get_payment_event_handles(
&self,
account: AccountAddress,
) -> Result<Option<(EventHandle, EventHandle)>> {
match self.get_account_state(account).await? {
Some(account_state) => Ok(account_state.get_account_resource()?.map(|resource| {
(
resource.sent_events().clone(),
resource.received_events().clone(),
)
})),
None => Ok(None),
}
}
pub async fn get_events(
&self,
event_key: &EventKey,
start: u64,
limit: u64,
) -> Result<Vec<EventView>> {
let resp = self
.0
.get_events(*event_key, start, limit)
.await?
.into_inner();
Ok(resp)
}
pub async fn get_all_events(&self, event_handle: &EventHandle) -> Result<Vec<EventView>> {
if event_handle.count() == 0 {
return Ok(vec![]);
}
let mut futures = vec![];
let mut i: u64 = 0;
while i.wrapping_add(BATCH_SIZE) < event_handle.count() {
futures.push(self.get_events(event_handle.key(), i, BATCH_SIZE));
i = i.wrapping_add(BATCH_SIZE);
}
futures.push(self.get_events(event_handle.key(), i, event_handle.count().wrapping_sub(i)));
let mut result = vec![];
for response in join_all(futures.into_iter()).await {
match response {
Ok(mut events) => result.append(&mut events),
Err(e) => return Err(e),
}
}
Ok(result)
}
}