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use std::fmt;
use std::fs::File;
use std::io;
use std::path::Path;
use std::rc::Rc;
use ::bits::name::DNameBuf;
use ::iana::Class;
use ::master::bufscanner::BufScanner;
use ::master::entry::Entry;
use ::master::error::ScanResult;
use ::master::record::MasterRecord;
use ::master::scanner::Scanner;
pub struct Reader<S: Scanner> {
scanner: Option<S>,
origin: Option<Rc<DNameBuf>>,
ttl: Option<u32>,
last: Option<(Rc<DNameBuf>, Class)>,
}
impl<S: Scanner> Reader<S> {
pub fn new(scanner: S) -> Self {
Reader {
scanner: Some(scanner),
origin: None,
ttl: None,
last: None
}
}
}
impl Reader<BufScanner<File>> {
pub fn open<P: AsRef<Path>>(path: P) -> io::Result<Self> {
Ok(Reader::new(try!(BufScanner::open(path))))
}
}
impl<T: AsRef<[u8]>> Reader<BufScanner<io::Cursor<T>>> {
pub fn create(t: T) -> Self {
Reader::new(BufScanner::create(t))
}
}
impl<S: Scanner> Reader<S> {
fn last_owner(&self) -> Option<Rc<DNameBuf>> {
if let Some((ref name, _)) = self.last {
Some(name.clone())
}
else {
None
}
}
fn last_class(&self) -> Option<Class> {
if let Some((_, class)) = self.last {
Some(class)
}
else {
None
}
}
fn next_entry(&mut self) -> ScanResult<Option<Entry>> {
let last_owner = self.last_owner();
let last_class = self.last_class();
if let Some(ref mut scanner) = self.scanner {
Entry::scan(scanner, last_owner, last_class, &self.origin,
self.ttl)
}
else {
Ok(None)
}
}
#[allow(match_same_arms)]
pub fn next_record(&mut self) -> ScanResult<Option<ReaderItem>> {
loop {
match self.next_entry() {
Ok(Some(Entry::Origin(origin))) => self.origin = Some(origin),
Ok(Some(Entry::Include{path, origin})) => {
return Ok(Some(ReaderItem::Include { path: path,
origin: origin }))
}
Ok(Some(Entry::Ttl(ttl))) => self.ttl = Some(ttl),
Ok(Some(Entry::Control{..})) => { },
Ok(Some(Entry::Record(record))) => {
self.last = Some((record.owner.clone(), record.class));
return Ok(Some(ReaderItem::Record(record)))
}
Ok(Some(Entry::Blank)) => { }
Ok(None) => return Ok(None),
Err(err) => {
self.scanner = None;
return Err(err)
}
}
}
}
}
impl<S: Scanner> Iterator for Reader<S> {
type Item = ScanResult<ReaderItem>;
fn next(&mut self) -> Option<ScanResult<ReaderItem>> {
match self.next_record() {
Ok(Some(res)) => Some(Ok(res)),
Ok(None) => None,
Err(err) => Some(Err(err))
}
}
}
#[derive(Clone, Debug)]
pub enum ReaderItem {
Record(MasterRecord),
Include { path: Vec<u8>, origin: Option<Rc<DNameBuf>> }
}
impl fmt::Display for ReaderItem {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
ReaderItem::Record(ref record) => write!(f, "{}", record),
ReaderItem::Include{ref path, ref origin} => {
try!(write!(f, "$INCLUDE {}", String::from_utf8_lossy(path)));
if let Some(ref origin) = *origin {
try!(write!(f, " {}", origin));
}
Ok(())
}
}
}
}
#[cfg(test)]
mod test {
use super::*;
use ::master::error::ScanError;
#[test]
fn print() {
let reader = Reader::create(&b"$ORIGIN ISI.EDU.
$TTL 86400
@ IN SOA VENERA Action\\.domains (
20 ; SERIAL
7200 ; REFRESH
600 ; RETRY
3600000; EXPIRE
60) ; MINIMUM
NS A.ISI.EDU.
NS VENERA
NS VAXA
MX 10 VENERA
MX 20 VAXA
A A 26.3.0.103
VENERA A 10.1.0.52
A 128.9.0.32
VAXA A 10.2.0.27
A 128.9.0.33
$INCLUDE <SUBSYS>ISI-MAILBOXES.TXT"[..]);
for item in reader {
match item {
Ok(item) => println!("{}", item),
Err(ScanError::Syntax(err, pos)) => {
println!("{}:{}: {:?}", pos.line(), pos.col(), err);
}
Err(err) => println!("{:?}", err)
}
}
}
}