use std::ops::DerefMut;
use toml::Value;
use toml_query::read::TomlValueReadExt;
use toml_query::set::TomlValueSetExt;
use std::collections::BTreeMap;
use std::fmt;
use std::fmt::Display;
use libimagstore::store::Store;
use libimagstore::storeid::StoreIdIterator;
use libimagstore::store::FileLockEntry;
use libimagstore::storeid::StoreId;
use libimagstore::storeid::IntoStoreId;
use module_path::ModuleEntryPath;
use error::Result;
use error::CounterError as CE;
use error::CounterErrorKind as CEK;
use error::ResultExt;
pub type CounterName = String;
#[derive(Clone, Debug, Eq, PartialEq, Ord, PartialOrd)]
pub struct CounterUnit(String);
impl Display for CounterUnit {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "({})", self.0)
}
}
impl CounterUnit {
pub fn new<S: Into<String>>(unit: S) -> CounterUnit {
CounterUnit(unit.into())
}
}
pub struct Counter<'a> {
fle: FileLockEntry<'a>,
unit: Option<CounterUnit>,
}
impl<'a> Counter<'a> {
pub fn new(store: &Store, name: CounterName, init: i64) -> Result<Counter> {
use std::ops::DerefMut;
debug!("Creating new counter: '{}' with value: {}", name, init);
let fle = {
let id = try!(ModuleEntryPath::new(name.clone())
.into_storeid()
.chain_err(|| CEK::StoreWriteError));
let mut lockentry = try!(store.create(id).chain_err(|| CEK::StoreWriteError));
{
let entry = lockentry.deref_mut();
let header = entry.get_header_mut();
let setres = header.set(&String::from("counter"), Value::Table(BTreeMap::new()));
if setres.is_err() {
return Err(CE::from_kind(CEK::StoreWriteError));
}
let setres = header.set(&String::from("counter.name"), Value::String(name));
if setres.is_err() {
return Err(CE::from_kind(CEK::StoreWriteError))
}
let setres = header.set(&String::from("counter.value"), Value::Integer(init));
if setres.is_err() {
return Err(CE::from_kind(CEK::StoreWriteError))
}
}
lockentry
};
Ok(Counter { fle: fle, unit: None })
}
pub fn with_unit(mut self, unit: Option<CounterUnit>) -> Result<Counter<'a>> {
self.unit = unit;
if let Some(u) = self.unit.clone() {
let header = self.fle.deref_mut().get_header_mut();
let setres = header.set(&String::from("counter.unit"), Value::String(u.0));
if setres.is_err() {
self.unit = None;
return Err(CE::from_kind(CEK::StoreWriteError))
}
};
Ok(self)
}
pub fn inc(&mut self) -> Result<()> {
let header = self.fle.deref_mut().get_header_mut();
let query = String::from("counter.value");
match try!(header.read(&query).chain_err(|| CEK::StoreReadError)) {
Some(&Value::Integer(i)) => {
header.set(&query, Value::Integer(i + 1))
.chain_err(|| CEK::StoreWriteError)
.map(|_| ())
},
_ => Err(CE::from_kind(CEK::StoreReadError)),
}
}
pub fn dec(&mut self) -> Result<()> {
let header = self.fle.deref_mut().get_header_mut();
let query = String::from("counter.value");
match try!(header.read(&query).chain_err(|| CEK::StoreReadError)) {
Some(&Value::Integer(i)) => {
header.set(&query, Value::Integer(i - 1))
.chain_err(|| CEK::StoreWriteError)
.map(|_| ())
},
_ => Err(CE::from_kind(CEK::StoreReadError)),
}
}
pub fn reset(&mut self) -> Result<()> {
self.set(0)
}
pub fn set(&mut self, v: i64) -> Result<()> {
self.fle
.deref_mut()
.get_header_mut()
.set(&String::from("counter.value"), Value::Integer(v))
.chain_err(|| CEK::StoreWriteError)
.map(|_| ())
}
pub fn name(&self) -> Result<CounterName> {
self.read_header_at("counter.name", |v| match v {
Some(&Value::String(ref s)) => Ok(s.clone()),
Some(_) => Err(CE::from_kind(CEK::HeaderTypeError)),
_ => Err(CE::from_kind(CEK::StoreReadError)),
})
}
pub fn value(&self) -> Result<i64> {
self.read_header_at("counter.value", |v| match v {
Some(&Value::Integer(i)) => Ok(i),
Some(_) => Err(CE::from_kind(CEK::HeaderTypeError)),
_ => Err(CE::from_kind(CEK::StoreReadError)),
})
}
pub fn unit(&self) -> Option<&CounterUnit> {
self.unit.as_ref()
}
pub fn read_unit(&self) -> Result<Option<CounterUnit>> {
self.read_header_at("counter.unit", |s| match s {
Some(&Value::String(ref s)) => Ok(Some(CounterUnit::new(s.clone()))),
Some(_) => Err(CE::from_kind(CEK::HeaderTypeError)),
_ => Err(CE::from_kind(CEK::StoreReadError)),
})
}
fn read_header_at<T, F>(&self, name: &str, f: F) -> Result<T>
where F: FnOnce(Option<&Value>) -> Result<T>
{
self.fle
.get_header()
.read(&String::from(name))
.chain_err(|| CEK::StoreWriteError)
.and_then(f)
}
pub fn load(name: CounterName, store: &Store) -> Result<Counter> {
debug!("Loading counter: '{}'", name);
let id = try!(ModuleEntryPath::new(name)
.into_storeid()
.chain_err(|| CEK::StoreWriteError));
Counter::from_storeid(store, id)
}
pub fn delete(name: CounterName, store: &Store) -> Result<()> {
debug!("Deleting counter: '{}'", name);
let id = try!(ModuleEntryPath::new(name)
.into_storeid()
.chain_err(|| CEK::StoreWriteError));
store.delete(id).chain_err(|| CEK::StoreWriteError)
}
pub fn all_counters(store: &Store) -> Result<CounterIterator> {
store.retrieve_for_module("counter")
.map(|iter| CounterIterator::new(store, iter))
.chain_err(|| CEK::StoreReadError)
}
}
trait FromStoreId {
fn from_storeid(&Store, StoreId) -> Result<Counter>;
}
impl<'a> FromStoreId for Counter<'a> {
fn from_storeid(store: &Store, id: StoreId) -> Result<Counter> {
debug!("Loading counter from storeid: '{:?}'", id);
match store.retrieve(id) {
Err(e) => Err(e).chain_err(|| CEK::StoreReadError),
Ok(c) => {
let mut counter = Counter { fle: c, unit: None };
counter.read_unit()
.chain_err(|| CEK::StoreReadError)
.and_then(|u| {
counter.unit = u;
Ok(counter)
})
}
}
}
}
pub struct CounterIterator<'a> {
store: &'a Store,
iditer: StoreIdIterator,
}
impl<'a> CounterIterator<'a> {
pub fn new(store: &'a Store, iditer: StoreIdIterator) -> CounterIterator<'a> {
CounterIterator {
store: store,
iditer: iditer,
}
}
}
impl<'a> Iterator for CounterIterator<'a> {
type Item = Result<Counter<'a>>;
fn next(&mut self) -> Option<Result<Counter<'a>>> {
self.iditer
.next()
.map(|id| Counter::from_storeid(self.store, id))
}
}