257 lines
8 KiB
Rust
257 lines
8 KiB
Rust
//
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// imag - the personal information management suite for the commandline
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// Copyright (C) 2015, 2016 Matthias Beyer <mail@beyermatthias.de> and contributors
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; version
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// 2.1 of the License.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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//
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use std::ops::DerefMut;
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use toml::Value;
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use std::collections::BTreeMap;
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use std::fmt;
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use std::fmt::Display;
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use libimagstore::store::Store;
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use libimagstore::storeid::StoreIdIterator;
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use libimagstore::store::FileLockEntry;
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use libimagstore::storeid::StoreId;
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use libimagstore::storeid::IntoStoreId;
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use libimagerror::into::IntoError;
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use module_path::ModuleEntryPath;
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use result::Result;
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use error::CounterError as CE;
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use error::CounterErrorKind as CEK;
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use error::error::MapErrInto;
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pub type CounterName = String;
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#[derive(Clone, Debug, Eq, PartialEq, Ord, PartialOrd)]
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pub struct CounterUnit(String);
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impl Display for CounterUnit {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "({})", self.0)
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}
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}
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impl CounterUnit {
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pub fn new<S: Into<String>>(unit: S) -> CounterUnit {
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CounterUnit(unit.into())
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}
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}
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pub struct Counter<'a> {
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fle: FileLockEntry<'a>,
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unit: Option<CounterUnit>,
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}
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impl<'a> Counter<'a> {
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pub fn new(store: &Store, name: CounterName, init: i64) -> Result<Counter> {
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use std::ops::DerefMut;
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debug!("Creating new counter: '{}' with value: {}", name, init);
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let fle = {
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let id = try!(ModuleEntryPath::new(name.clone())
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.into_storeid()
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.map_err_into(CEK::StoreWriteError));
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let mut lockentry = try!(store.create(id).map_err_into(CEK::StoreWriteError));
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{
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let mut entry = lockentry.deref_mut();
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let mut header = entry.get_header_mut();
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let setres = header.set("counter", Value::Table(BTreeMap::new()));
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if setres.is_err() {
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return Err(CEK::StoreWriteError.into_error());
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}
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let setres = header.set("counter.name", Value::String(name));
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if setres.is_err() {
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return Err(CEK::StoreWriteError.into_error())
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}
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let setres = header.set("counter.value", Value::Integer(init));
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if setres.is_err() {
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return Err(CEK::StoreWriteError.into_error())
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}
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}
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lockentry
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};
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Ok(Counter { fle: fle, unit: None })
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}
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pub fn with_unit(mut self, unit: Option<CounterUnit>) -> Result<Counter<'a>> {
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self.unit = unit;
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if let Some(u) = self.unit.clone() {
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let mut header = self.fle.deref_mut().get_header_mut();
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let setres = header.set("counter.unit", Value::String(u.0));
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if setres.is_err() {
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self.unit = None;
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return Err(CEK::StoreWriteError.into_error())
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}
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};
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Ok(self)
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}
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pub fn inc(&mut self) -> Result<()> {
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let mut header = self.fle.deref_mut().get_header_mut();
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match header.read("counter.value") {
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Ok(Some(Value::Integer(i))) => {
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header.set("counter.value", Value::Integer(i + 1))
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.map_err_into(CEK::StoreWriteError)
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.map(|_| ())
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},
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Err(e) => Err(CE::new(CEK::StoreReadError, Some(Box::new(e)))),
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_ => Err(CE::new(CEK::StoreReadError, None)),
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}
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}
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pub fn dec(&mut self) -> Result<()> {
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let mut header = self.fle.deref_mut().get_header_mut();
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match header.read("counter.value") {
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Ok(Some(Value::Integer(i))) => {
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header.set("counter.value", Value::Integer(i - 1))
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.map_err_into(CEK::StoreWriteError)
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.map(|_| ())
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},
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Err(e) => Err(CE::new(CEK::StoreReadError, Some(Box::new(e)))),
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_ => Err(CE::new(CEK::StoreReadError, None)),
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}
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}
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pub fn reset(&mut self) -> Result<()> {
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self.set(0)
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}
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pub fn set(&mut self, v: i64) -> Result<()> {
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let mut header = self.fle.deref_mut().get_header_mut();
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header.set("counter.value", Value::Integer(v))
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.map_err_into(CEK::StoreWriteError)
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.map(|_| ())
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}
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pub fn name(&self) -> Result<CounterName> {
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self.read_header_at("counter.name", |v| match v {
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Some(Value::String(s)) => Ok(s),
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_ => Err(CEK::HeaderTypeError.into_error()),
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})
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}
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pub fn value(&self) -> Result<i64> {
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self.read_header_at("counter.value", |v| match v {
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Some(Value::Integer(i)) => Ok(i),
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_ => Err(CEK::HeaderTypeError.into_error()),
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})
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}
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pub fn unit(&self) -> Option<&CounterUnit> {
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self.unit.as_ref()
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}
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pub fn read_unit(&self) -> Result<Option<CounterUnit>> {
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self.read_header_at("counter.unit", |s| match s {
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Some(Value::String(s)) => Ok(Some(CounterUnit::new(s))),
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Some(_) => Err(CEK::HeaderTypeError.into_error()),
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None => Ok(None),
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})
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}
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fn read_header_at<T, F>(&self, name: &str, f: F) -> Result<T>
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where F: FnOnce(Option<Value>) -> Result<T>
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{
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self.fle.get_header().read(name).map_err_into(CEK::StoreWriteError).and_then(f)
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}
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pub fn load(name: CounterName, store: &Store) -> Result<Counter> {
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debug!("Loading counter: '{}'", name);
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let id = try!(ModuleEntryPath::new(name)
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.into_storeid()
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.map_err_into(CEK::StoreWriteError));
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Counter::from_storeid(store, id)
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}
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pub fn delete(name: CounterName, store: &Store) -> Result<()> {
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debug!("Deleting counter: '{}'", name);
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let id = try!(ModuleEntryPath::new(name)
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.into_storeid()
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.map_err_into(CEK::StoreWriteError));
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store.delete(id).map_err_into(CEK::StoreWriteError)
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}
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pub fn all_counters(store: &Store) -> Result<CounterIterator> {
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store.retrieve_for_module("counter")
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.map(|iter| CounterIterator::new(store, iter))
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.map_err_into(CEK::StoreReadError)
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}
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}
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trait FromStoreId {
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fn from_storeid(&Store, StoreId) -> Result<Counter>;
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}
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impl<'a> FromStoreId for Counter<'a> {
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fn from_storeid(store: &Store, id: StoreId) -> Result<Counter> {
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debug!("Loading counter from storeid: '{:?}'", id);
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match store.retrieve(id) {
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Err(e) => Err(CE::new(CEK::StoreReadError, Some(Box::new(e)))),
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Ok(c) => {
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let mut counter = Counter { fle: c, unit: None };
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counter.read_unit()
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.map_err_into(CEK::StoreReadError)
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.and_then(|u| {
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counter.unit = u;
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Ok(counter)
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})
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}
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}
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}
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}
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pub struct CounterIterator<'a> {
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store: &'a Store,
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iditer: StoreIdIterator,
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}
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impl<'a> CounterIterator<'a> {
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pub fn new(store: &'a Store, iditer: StoreIdIterator) -> CounterIterator<'a> {
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CounterIterator {
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store: store,
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iditer: iditer,
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}
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}
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}
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impl<'a> Iterator for CounterIterator<'a> {
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type Item = Result<Counter<'a>>;
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fn next(&mut self) -> Option<Result<Counter<'a>>> {
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self.iditer
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.next()
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.map(|id| Counter::from_storeid(self.store, id))
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}
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}
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