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use std::io;
use std::result;
use async_trait::async_trait;
use bytes::Bytes;
use fbthrift::{ApplicationException, ApplicationExceptionErrorCode, BinaryProtocol, Transport};
use nebula_fbthrift_graph::{
client::{GraphService, GraphServiceImpl},
errors::graph_service::{AuthenticateError, ExecuteError, SignoutError},
types::{ErrorCode, ExecutionResponse},
};
use super::query::{GraphQuery, GraphQueryError, GraphQueryOutput};
struct GraphConnection<T>
where
T: Transport,
Bytes: ::fbthrift::Framing<DecBuf = ::fbthrift::FramingDecoded<T>>,
::fbthrift::ProtocolEncoded<BinaryProtocol>:
::fbthrift::BufMutExt<Final = ::fbthrift::FramingEncodedFinal<T>>,
{
service: GraphServiceImpl<BinaryProtocol, T>,
}
impl<T> GraphConnection<T>
where
T: Transport,
Bytes: ::fbthrift::Framing<DecBuf = ::fbthrift::FramingDecoded<T>>,
::fbthrift::ProtocolEncoded<BinaryProtocol>:
::fbthrift::BufMutExt<Final = ::fbthrift::FramingEncodedFinal<T>>,
{
fn new(transport: T) -> Self {
Self {
service: GraphServiceImpl::<BinaryProtocol, _>::new(transport),
}
}
}
pub struct GraphClient<T>
where
T: Transport,
Bytes: ::fbthrift::Framing<DecBuf = ::fbthrift::FramingDecoded<T>>,
::fbthrift::ProtocolEncoded<BinaryProtocol>:
::fbthrift::BufMutExt<Final = ::fbthrift::FramingEncodedFinal<T>>,
{
connection: GraphConnection<T>,
}
impl<T> GraphClient<T>
where
T: Transport,
Bytes: ::fbthrift::Framing<DecBuf = ::fbthrift::FramingDecoded<T>>,
::fbthrift::ProtocolEncoded<BinaryProtocol>:
::fbthrift::BufMutExt<Final = ::fbthrift::FramingEncodedFinal<T>>,
{
pub fn new(transport: T) -> Self {
Self {
connection: GraphConnection::new(transport),
}
}
pub async fn authenticate(
self,
username: &str,
password: &str,
) -> result::Result<GraphSession<T>, AuthenticateError> {
let res = self
.connection
.service
.authenticate(username, password)
.await?;
if res.error_code != ErrorCode::SUCCEEDED {
return Err(ApplicationException::new(
ApplicationExceptionErrorCode::Unknown,
res.error_msg.unwrap_or_else(|| "Unknown".to_owned()),
)
.into());
}
let session_id = res.session_id.ok_or_else(|| {
ApplicationException::new(
ApplicationExceptionErrorCode::InternalError,
"Missing session_id".to_owned(),
)
})?;
Ok(GraphSession::new(self.connection, session_id))
}
}
pub struct GraphSession<T>
where
T: Transport,
Bytes: ::fbthrift::Framing<DecBuf = ::fbthrift::FramingDecoded<T>>,
::fbthrift::ProtocolEncoded<BinaryProtocol>:
::fbthrift::BufMutExt<Final = ::fbthrift::FramingEncodedFinal<T>>,
{
connection: GraphConnection<T>,
session_id: i64,
close_required: bool,
}
impl<T> GraphSession<T>
where
T: Transport,
Bytes: ::fbthrift::Framing<DecBuf = ::fbthrift::FramingDecoded<T>>,
::fbthrift::ProtocolEncoded<BinaryProtocol>:
::fbthrift::BufMutExt<Final = ::fbthrift::FramingEncodedFinal<T>>,
{
fn new(connection: GraphConnection<T>, session_id: i64) -> Self {
Self {
connection,
session_id,
close_required: false,
}
}
pub async fn signout(self) -> result::Result<(), SignoutError> {
self.connection.service.signout(self.session_id).await
}
pub async fn execute(&mut self, stmt: &str) -> result::Result<ExecutionResponse, ExecuteError> {
let res = match self.connection.service.execute(self.session_id, stmt).await {
Ok(res) => res,
Err(ExecuteError::ThriftError(err)) => {
if let Some(io_err) = err.downcast_ref::<io::Error>() {
if io_err.kind() == io::ErrorKind::BrokenPipe {
self.close_required = true;
}
}
return Err(ExecuteError::ThriftError(err));
}
Err(err) => return Err(err),
};
match res.error_code {
ErrorCode::E_SESSION_INVALID | ErrorCode::E_SESSION_TIMEOUT => {
self.close_required = true;
}
_ => {}
}
Ok(res)
}
pub fn is_close_required(&self) -> bool {
self.close_required
}
}
use serde::de::DeserializeOwned;
#[async_trait]
impl<T> GraphQuery for GraphSession<T>
where
T: Transport + Send + Sync,
Bytes: ::fbthrift::Framing<DecBuf = ::fbthrift::FramingDecoded<T>>,
::fbthrift::ProtocolEncoded<BinaryProtocol>:
::fbthrift::BufMutExt<Final = ::fbthrift::FramingEncodedFinal<T>>,
{
async fn query_as<D: DeserializeOwned>(
&mut self,
stmt: &str,
) -> result::Result<GraphQueryOutput<D>, GraphQueryError> {
let res = self
.execute(stmt)
.await
.map_err(GraphQueryError::ExecuteError)?;
if res.error_code != ErrorCode::SUCCEEDED {
return Err(GraphQueryError::ResponseError(
res.error_code,
res.error_msg,
));
}
GraphQueryOutput::new(res)
}
}