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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
use std::convert::Into;
use ::ProtocolErrorKind;
use super::{TFieldIdentifier, TListIdentifier, TMapIdentifier, TMessageIdentifier, TInputProtocol,
TSetIdentifier, TStructIdentifier};
/// `TInputProtocol` required to use a `TMultiplexedProcessor`.
///
/// A `TMultiplexedProcessor` reads incoming message identifiers to determine to
/// which `TProcessor` requests should be forwarded. However, once read, those
/// message identifier bytes are no longer on the wire. Since downstream
/// processors expect to read message identifiers from the given input protocol
/// we need some way of supplying a `TMessageIdentifier` with the service-name
/// stripped. This implementation stores the received `TMessageIdentifier`
/// (without the service name) and passes it to the wrapped `TInputProtocol`
/// when `TInputProtocol::read_message_begin(...)` is called. It delegates all
/// other calls directly to the wrapped `TInputProtocol`.
///
/// This type **should not** be used by application code.
///
/// # Examples
///
/// Create and use a `TStoredInputProtocol`.
///
/// ```no_run
/// use std::cell::RefCell;
/// use std::rc::Rc;
/// use thrift;
/// use thrift::protocol::{TInputProtocol, TMessageIdentifier, TMessageType, TOutputProtocol};
/// use thrift::protocol::{TBinaryInputProtocol, TBinaryOutputProtocol, TStoredInputProtocol};
/// use thrift::server::TProcessor;
/// use thrift::transport::{TTcpTransport, TTransport};
///
/// // sample processor
/// struct ActualProcessor;
/// impl TProcessor for ActualProcessor {
/// fn process(
/// &mut self,
/// _: &mut TInputProtocol,
/// _: &mut TOutputProtocol
/// ) -> thrift::Result<()> {
/// unimplemented!()
/// }
/// }
/// let mut processor = ActualProcessor {};
///
/// // construct the shared transport
/// let mut transport = TTcpTransport::new();
/// transport.open("localhost:9090").unwrap();
/// let transport = Rc::new(RefCell::new(Box::new(transport) as Box<TTransport>));
///
/// // construct the actual input and output protocols
/// let mut i_prot = TBinaryInputProtocol::new(transport.clone(), true);
/// let mut o_prot = TBinaryOutputProtocol::new(transport.clone(), true);
///
/// // message identifier received from remote and modified to remove the service name
/// let new_msg_ident = TMessageIdentifier::new("service_call", TMessageType::Call, 1);
///
/// // construct the proxy input protocol
/// let mut proxy_i_prot = TStoredInputProtocol::new(&mut i_prot, new_msg_ident);
/// let res = processor.process(&mut proxy_i_prot, &mut o_prot);
/// ```
pub struct TStoredInputProtocol<'a> {
inner: &'a mut TInputProtocol,
message_ident: Option<TMessageIdentifier>,
}
impl<'a> TStoredInputProtocol<'a> {
/// Create a `TStoredInputProtocol` that delegates all calls other than
/// `TInputProtocol::read_message_begin(...)` to a `wrapped`
/// `TInputProtocol`. `message_ident` is the modified message identifier -
/// with service name stripped - that will be passed to
/// `wrapped.read_message_begin(...)`.
pub fn new(wrapped: &mut TInputProtocol,
message_ident: TMessageIdentifier)
-> TStoredInputProtocol {
TStoredInputProtocol {
inner: wrapped,
message_ident: message_ident.into(),
}
}
}
impl<'a> TInputProtocol for TStoredInputProtocol<'a> {
fn read_message_begin(&mut self) -> ::Result<TMessageIdentifier> {
self.message_ident.take().ok_or_else(|| {
::errors::new_protocol_error(ProtocolErrorKind::Unknown,
"message identifier already read")
})
}
fn read_message_end(&mut self) -> ::Result<()> {
self.inner.read_message_end()
}
fn read_struct_begin(&mut self) -> ::Result<Option<TStructIdentifier>> {
self.inner.read_struct_begin()
}
fn read_struct_end(&mut self) -> ::Result<()> {
self.inner.read_struct_end()
}
fn read_field_begin(&mut self) -> ::Result<TFieldIdentifier> {
self.inner.read_field_begin()
}
fn read_field_end(&mut self) -> ::Result<()> {
self.inner.read_field_end()
}
fn read_bytes(&mut self) -> ::Result<Vec<u8>> {
self.inner.read_bytes()
}
fn read_bool(&mut self) -> ::Result<bool> {
self.inner.read_bool()
}
fn read_i8(&mut self) -> ::Result<i8> {
self.inner.read_i8()
}
fn read_i16(&mut self) -> ::Result<i16> {
self.inner.read_i16()
}
fn read_i32(&mut self) -> ::Result<i32> {
self.inner.read_i32()
}
fn read_i64(&mut self) -> ::Result<i64> {
self.inner.read_i64()
}
fn read_double(&mut self) -> ::Result<f64> {
self.inner.read_double()
}
fn read_string(&mut self) -> ::Result<String> {
self.inner.read_string()
}
fn read_list_begin(&mut self) -> ::Result<TListIdentifier> {
self.inner.read_list_begin()
}
fn read_list_end(&mut self) -> ::Result<()> {
self.inner.read_list_end()
}
fn read_set_begin(&mut self) -> ::Result<TSetIdentifier> {
self.inner.read_set_begin()
}
fn read_set_end(&mut self) -> ::Result<()> {
self.inner.read_set_end()
}
fn read_map_begin(&mut self) -> ::Result<TMapIdentifier> {
self.inner.read_map_begin()
}
fn read_map_end(&mut self) -> ::Result<()> {
self.inner.read_map_end()
}
// utility
//
fn read_byte(&mut self) -> ::Result<u8> {
self.inner.read_byte()
}
}
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