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use std::io::{ErrorKind, Read};
use bgp_models::mrt::{CommonHeader, EntryType, MrtMessage, MrtRecord};
use crate::parser::{DataBytes, parse_bgp4mp, parse_table_dump_message, parse_table_dump_v2_message, ParserError, ReadUtils};
use crate::error::ParserErrorKind;
use crate::num_traits::FromPrimitive;
pub fn parse_common_header<T: std::io::Read>(input: &mut T) -> Result<(Vec<u8>, CommonHeader), ParserErrorKind> {
let timestamp = match input.read_32b() {
Ok(t) => {t}
Err(e) => {
return match e.kind() {
ErrorKind::UnexpectedEof => {
Err(ParserErrorKind::EofExpected)
}
_ => {
Err(ParserErrorKind::from(e))
}
}
}
};
let entry_type_raw = input.read_16b()?;
let entry_type = match EntryType::from_u16(entry_type_raw) {
Some(t) => Ok(t),
None => Err(ParserErrorKind::ParseError(
format!("Failed to parse entry type: {}", entry_type_raw),
)),
}?;
let entry_subtype = input.read_16b()?;
let mut length = input.read_32b()?;
let microsecond_timestamp = match &entry_type {
EntryType::BGP4MP_ET => {
length -= 4;
Some(input.read_32b()?)
},
_ => None,
};
let mut bytes: Vec<u8> = vec![];
bytes.extend(timestamp.to_be_bytes());
bytes.extend(entry_type_raw.to_be_bytes());
bytes.extend(entry_subtype.to_be_bytes());
bytes.extend(length.to_be_bytes());
if let Some(mt) = µsecond_timestamp {
bytes.extend(mt.to_be_bytes());
}
Ok((bytes, CommonHeader {
timestamp,
microsecond_timestamp,
entry_type,
entry_subtype,
length,
}))
}
pub fn parse_mrt_record<T: Read>(input: &mut T) -> Result<MrtRecord, ParserError> {
let (header_bytes, common_header) = match parse_common_header(input){
Ok(v) => v,
Err(e) => return Err(ParserError{error: e, bytes: None})
};
let mut buffer = Vec::with_capacity(common_header.length as usize);
match input.take(common_header.length as u64).read_to_end(&mut buffer) {
Ok(_) => {}
Err(e) => return Err(ParserError{error: ParserErrorKind::IoError(e), bytes: None})
}
let mut data = DataBytes::new(&buffer);
match parse_raw_bytes(&common_header, &mut data) {
Ok(message) => {
Ok(MrtRecord {
common_header,
message,
})
},
Err(e) => {
let mut total_bytes = vec![];
total_bytes.extend(header_bytes);
total_bytes.extend(buffer);
Err(ParserError{ error: e, bytes: Some(total_bytes) })
}
}
}
fn parse_raw_bytes(common_header: &CommonHeader, data: &mut DataBytes) -> Result<MrtMessage, ParserErrorKind>{
let message: MrtMessage = match &common_header.entry_type {
EntryType::TABLE_DUMP => {
let msg = parse_table_dump_message(common_header.entry_subtype,data);
match msg {
Ok(msg) => MrtMessage::TableDumpMessage(msg),
Err(e) => {
dbg!(&e);
return Err(e);
}
}
}
EntryType::TABLE_DUMP_V2 => {
let msg = parse_table_dump_v2_message(common_header.entry_subtype, data);
match msg {
Ok(msg) => MrtMessage::TableDumpV2Message(msg),
Err(e) => {
return Err(e);
}
}
}
EntryType::BGP4MP|EntryType::BGP4MP_ET => {
let msg = parse_bgp4mp(common_header.entry_subtype, data);
match msg {
Ok(msg) => MrtMessage::Bgp4Mp(msg),
Err(e) => {
return Err(e);
}
}
}
v => {
dbg!(common_header);
return Err(ParserErrorKind::Unsupported(format!("unsupported MRT type: {:?}", v)))
}
};
Ok(message)
}
