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Start putting tokio executor together

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31
Cargo.toml
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name = "jobs" name = "jobs"
version = "0.1.0" version = "0.1.0"
authors = ["asonix <asonix@asonix.dog>"] authors = ["asonix <asonix@asonix.dog>"]
edition = "2018"
[dependencies] [workspace]
failure = "0.1" members = [
futures = "0.1.21" "jobs-core",
log = "0.4" "jobs-executor",
serde = "1.0" "jobs-tokio",
serde_derive = "1.0" ]
serde_json = "1.0"
[features]
default = ["jobs-tokio"]
[dependencies.jobs-core]
version = "0.1"
path = "jobs-core"
[dependencies.jobs-executor]
version = "0.1"
path = "jobs-executor"
optional = true
[dependencies.jobs-tokio]
version = "0.1"
path = "jobs-tokio"
optional = true

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jobs-core/Cargo.toml Normal file
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[package]
name = "jobs-core"
version = "0.1.0"
authors = ["asonix <asonix@asonix.dog>"]
edition = "2018"
[dependencies]
failure = "0.1"
futures = "0.1.21"
log = "0.4"
rkv = "0.5"
serde = "1.0"
serde_derive = "1.0"
serde_json = "1.0"

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jobs-core/LICENSE Normal file
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This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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#[macro_use]
extern crate failure;
#[macro_use]
extern crate log;
#[macro_use]
extern crate serde_derive;
use std::collections::{HashMap, VecDeque};
use failure::Error;
use futures::future::{Either, Future, IntoFuture};
use serde::{de::DeserializeOwned, ser::Serialize};
use serde_json::Value;
#[derive(Debug, Fail)]
pub enum JobError {
#[fail(display = "Error performing job: {}", _0)]
Processing(#[cause] Error),
#[fail(display = "Could not make JSON value from arguments")]
Json,
#[fail(display = "No processor available for job")]
MissingProcessor,
}
/// The Processor trait
///
/// Processors are
pub trait Processor {
type Arguments: Serialize + DeserializeOwned;
/// The name of the processor
///
/// This name must be unique!!! It is used to look up which processor should handle a job
fn name() -> &'static str;
/// Define the default number of retries for a given processor
///
/// Jobs can override
fn max_retries() -> MaxRetries;
/// Defines how jobs for this processor are processed
///
/// Please do not perform blocking operations in the process method except if put behind
/// tokio's `blocking` abstraction
fn process(&self, args: Self::Arguments) -> Box<dyn Future<Item = (), Error = Error> + Send>;
/// A provided method to create a new Job from provided arguments
///
/// ### Example
///
/// ```rust
/// #[macro_use]
/// extern crate log;
///
/// use jobs::{Processor, MaxRetries};
/// use failure::Error;
/// use futures::future::{Future, IntoFuture};
///
/// struct MyProcessor;
///
/// impl Processor for MyProcessor {
/// type Arguments = i32;
///
/// fn name() -> &'static str {
/// "IncrementProcessor"
/// }
///
/// fn max_retries() -> MaxRetries {
/// MaxRetries::Count(1)
/// }
///
/// fn process(
/// &self,
/// args: Self::Arguments,
/// ) -> Box<dyn Future<Item = (), Error = Error> + Send> {
/// info!("Processing {}", args);
///
/// Box::new(Ok(()).into_future())
/// }
/// }
///
/// fn main() -> Result<(), Error> {
/// let job = MyProcessor::new_job(1234, None)?;
///
/// Ok(())
/// }
/// ```
fn new_job(args: Self::Arguments, max_retries: Option<MaxRetries>) -> Result<JobInfo, Error> {
let job = JobInfo {
id: None,
processor: Self::name().to_owned(),
status: JobStatus::Pending,
args: serde_json::to_value(args)?,
retry_count: max_retries.unwrap_or(Self::max_retries()),
};
Ok(job)
}
/// A provided method to coerce arguments into the expected type
fn do_processing(&self, args: Value) -> Box<dyn Future<Item = (), Error = JobError> + Send> {
let res = serde_json::from_value::<Self::Arguments>(args);
let fut = match res {
Ok(item) => Either::A(self.process(item).map_err(JobError::Processing)),
Err(_) => Either::B(Err(JobError::Json).into_future()),
};
Box::new(fut)
}
}
#[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
pub enum JobStatus {
Pending,
Active,
Finished,
}
#[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
pub enum Backoff {
/// Seconds between execution
Linear(usize),
/// Base for seconds between execution
Exponential(usize),
}
#[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
pub enum MaxRetries {
/// Keep retrying forever
Infinite,
/// Put a limit on the number of retries
Count(usize),
}
#[derive(Clone, Debug, Eq, PartialEq)]
enum ShouldStop {
LimitReached,
Requeue,
}
impl ShouldStop {
fn should_requeue(&self) -> bool {
*self == ShouldStop::Requeue
}
}
impl MaxRetries {
fn decrement(&mut self) -> ShouldStop {
match *self {
MaxRetries::Infinite => ShouldStop::Requeue,
MaxRetries::Count(ref mut count) => {
*count = *count - 1;
if *count == 0 {
ShouldStop::LimitReached
} else {
ShouldStop::Requeue
}
}
}
}
}
#[derive(Deserialize, Serialize)]
pub struct JobInfo {
/// ID of the job, None means an ID has not been set
id: Option<usize>,
/// Name of the processor that should handle this job
processor: String,
/// Arguments for a given job
args: Value,
/// Status of the job
status: JobStatus,
/// Retries left for this job, None means no limit
retry_count: MaxRetries,
}
impl JobInfo {
fn decrement(&mut self) -> ShouldStop {
self.retry_count.decrement()
}
pub fn id(&self) -> Option<usize> {
self.id.clone()
}
pub fn set_id(&mut self, id: usize) {
if self.id.is_none() {
self.id = Some(id);
}
}
}
#[derive(Deserialize, Serialize)]
pub struct Jobs {
inner: VecDeque<JobInfo>,
}
impl Jobs {
fn queue(&mut self, job: JobInfo) {
self.inner.push_back(job);
}
fn pop(&mut self) -> Option<JobInfo> {
self.inner.pop_front()
}
}
impl Default for Jobs {
fn default() -> Self {
Jobs {
inner: Default::default(),
}
}
}
pub type ProcessFn =
Box<dyn Fn(Value) -> Box<dyn Future<Item = (), Error = JobError> + Send> + Send>;
pub struct Processors {
inner: HashMap<String, ProcessFn>,
jobs: Jobs,
}
impl Processors {
pub fn new() -> Self {
Default::default()
}
pub fn register_processor<P>(&mut self, processor: P)
where
P: Processor + Send + Sync + 'static,
{
self.inner.insert(
P::name().to_owned(),
Box::new(move |value| processor.do_processing(value)),
);
}
pub fn queue(&mut self, job: JobInfo) {
self.jobs.queue(job);
}
pub fn turn(mut self) -> impl Future<Item = Self, Error = ()> {
match self.jobs.pop() {
Some(job) => Either::A(self.process_job(job)),
None => Either::B(Ok(self).into_future()),
}
}
fn process_job(mut self, job: JobInfo) -> impl Future<Item = Self, Error = ()> {
let processor = self.inner.remove(&job.processor);
processor
.ok_or_else(|| {
error!("No processor");
()
})
.into_future()
.and_then(move |processor| process(self, processor, job))
}
}
impl Default for Processors {
fn default() -> Self {
Processors {
inner: Default::default(),
jobs: Default::default(),
}
}
}
fn process(
mut processors: Processors,
process_fn: ProcessFn,
mut job: JobInfo,
) -> impl Future<Item = Processors, Error = ()> {
let args = job.args.clone();
let processor = job.processor.clone();
let fut = process_fn(args).then(move |res| match res {
Ok(_) => Ok(info!("Job completed, {}", processor)),
Err(e) => {
error!("Job errored, {}, {}", processor, e);
Err(e)
}
});
processors.inner.insert(job.processor.clone(), process_fn);
fut.then(|res| {
if let Err(e) = res {
if job.decrement().should_requeue() {
processors.jobs.queue(job);
} else {
error!("Job failed permanently, {}, {}", &job.processor, e);
}
}
Ok(processors)
})
}

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jobs-executor/Cargo.toml Normal file
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@ -0,0 +1,7 @@
[package]
name = "jobs-executor"
version = "0.1.0"
authors = ["asonix <asonix@asonix.dog>"]
edition = "2018"
[dependencies]

7
jobs-executor/src/lib.rs Normal file
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#[cfg(test)]
mod tests {
#[test]
fn it_works() {
assert_eq!(2 + 2, 4);
}
}

20
jobs-tokio/Cargo.toml Normal file
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@ -0,0 +1,20 @@
[package]
name = "jobs-tokio"
version = "0.1.0"
authors = ["asonix <asonix@asonix.dog>"]
edition = "2018"
[dependencies]
futures = "0.1"
lmdb = "0.8"
log = "0.4"
tokio = "0.1"
tokio-threadpool = "0.1"
[dependencies.jobs-core]
version = "0.1"
path = "../jobs-core"
[dependencies.kv]
version = "0.6"
features = ["bincode-value"]

110
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#[macro_use]
extern crate log;
mod storage;
use std::path::{Path, PathBuf};
use futures::{
future::poll_fn,
sync::mpsc::{channel, Receiver, SendError, Sender},
Future, Sink, Stream,
};
use jobs_core::{JobInfo, Processor, Processors};
use tokio_threadpool::blocking;
use crate::storage::Storage;
pub struct ProcessorHandle {
spawner: Sender<JobInfo>,
}
impl ProcessorHandle {
pub fn queue(
&self,
job: JobInfo,
) -> impl Future<Item = Sender<JobInfo>, Error = SendError<JobInfo>> {
self.spawner.clone().send(job)
}
}
fn setup_kv(db_path: PathBuf) -> impl Future<Item = Storage, Error = ()> {
tokio::fs::create_dir_all(db_path.clone())
.map_err(|e| error!("Failed to create db directory: {}", e))
.and_then(move |_| {
poll_fn(move || {
let path = db_path.clone();
blocking(move || {
Storage::init(0, path).map_err(|e| error!("Error initializing db, {}", e))
})
.map_err(|e| error!("Error in blocking, {}", e))
})
})
.and_then(|res| res)
}
pub struct JobRunner {
processors: Processors,
receiver: Receiver<JobInfo>,
sender: Sender<JobInfo>,
db_path: PathBuf,
}
impl JobRunner {
pub fn new<P: AsRef<Path>>(db_path: P) -> Self {
let (tx, rx) = channel::<JobInfo>(100);
JobRunner {
processors: Default::default(),
receiver: rx,
sender: tx,
db_path: db_path.as_ref().to_owned(),
}
}
pub fn register_processor<P>(&mut self, processor: P)
where
P: Processor + Send + Sync + 'static,
{
self.processors.register_processor(processor);
}
fn runner(self) -> impl Future<Item = (), Error = ()> {
let JobRunner {
processors,
receiver,
sender,
db_path,
} = self;
let _ = sender;
let _ = db_path;
// tokio::spawn(setup_kv(db_path));
receiver
.fold(processors, |mut processors, job| {
processors.queue(job);
Box::new(processors.turn())
})
.map(|_| ())
}
pub fn spawn(self) -> ProcessorHandle {
let spawner = self.sender.clone();
tokio::spawn(self.runner());
ProcessorHandle { spawner }
}
}
#[cfg(test)]
mod tests {
#[test]
fn it_works() {
assert_eq!(2 + 2, 4);
}
}

223
jobs-tokio/src/storage.rs Normal file
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@ -0,0 +1,223 @@
use std::{
path::PathBuf,
sync::{Arc, RwLock},
};
use jobs_core::JobInfo;
use kv::{bincode::Bincode, Config, Error, Manager, Serde, Store, ValueBuf};
use lmdb::Error as LmdbError;
/// Set the status of a job when storing it
pub enum JobStatus {
/// Job should be queued
Pending,
/// Job is running
Running,
/// Job has failed
Failed,
}
pub struct Storage {
runner_id: usize,
store: Arc<RwLock<Store>>,
}
impl Storage {
pub fn new(runner_id: usize, store: Arc<RwLock<Store>>) -> Self {
Storage { runner_id, store }
}
pub fn init(runner_id: usize, path: PathBuf) -> Result<Self, Error> {
let mut manager = Manager::new();
let mut cfg = Config::default(path);
// Create our buckets
for bucket in Storage::buckets().iter() {
cfg.bucket(bucket, None);
}
let handle = manager.open(cfg)?;
Ok(Storage::new(runner_id, handle))
}
pub fn get_new_id(&self) -> Result<usize, Error> {
let store = self.store.write()?;
let bucket = store.bucket::<&str, ValueBuf<Bincode<usize>>>(Some(Storage::id_store()))?;
let mut txn = store.write_txn()?;
let mut other_runner_id = 0;
loop {
let lock_value = Bincode::to_value_buf(self.runner_id)?;
match txn.set_no_overwrite(&bucket, "id-lock", lock_value) {
Ok(_) => break,
Err(e) => {
match txn.get(&bucket, "id-lock") {
Ok(other_id) => {
let other_id = other_id.inner()?.to_serde();
if other_runner_id != other_id {
other_runner_id = other_id;
info!("Id lock held by runner {}", other_id);
}
}
Err(e) => match e {
Error::NotFound => continue,
e => return Err(e),
},
}
match e {
Error::LMDB(lmdb) => match lmdb {
LmdbError::KeyExist => continue,
e => return Err(Error::LMDB(e)),
},
e => return Err(e),
}
}
}
}
let id = match txn.get(&bucket, "current-id") {
Ok(id) => id.inner()?.to_serde(),
Err(e) => match e {
Error::NotFound => 1,
_ => return Err(e),
},
};
let new_id = id + 1;
let new_id_value = Bincode::to_value_buf(new_id)?;
txn.set(&bucket, "current-id", new_id_value)?;
txn.del(&bucket, "id-lock")?;
txn.commit()?;
Ok(new_id)
}
pub fn store_job(&self, mut job: JobInfo, status: JobStatus) -> Result<(), Error> {
let job_id = match job.id() {
Some(id) => id,
None => {
let id = self.get_new_id()?;
job.set_id(id);
id
}
};
let job_value = Bincode::to_value_buf(job)?;
{
let store = self.store.write()?;
let bucket =
store.bucket::<&str, ValueBuf<Bincode<JobInfo>>>(Some(Storage::job_store()))?;
let mut txn = store.write_txn()?;
txn.set(&bucket, &job_id.to_string(), job_value)?;
txn.commit()?;
}
match status {
JobStatus::Pending => self.queue_job(job_id)?,
JobStatus::Running => self.run_job(job_id)?,
JobStatus::Failed => self.fail_job(job_id)?,
}
Ok(())
}
fn queue_job(&self, id: usize) -> Result<(), Error> {
self.add_job_to(id, Storage::job_queue())?;
self.delete_job_from(id, Storage::job_failed())?;
self.delete_job_from(id, Storage::job_running())?;
Ok(())
}
fn fail_job(&self, id: usize) -> Result<(), Error> {
self.add_job_to(id, Storage::job_failed())?;
self.delete_job_from(id, Storage::job_queue())?;
self.delete_job_from(id, Storage::job_running())?;
Ok(())
}
fn run_job(&self, id: usize) -> Result<(), Error> {
self.add_job_to(id, Storage::job_running())?;
self.delete_job_from(id, Storage::job_queue())?;
self.delete_job_from(id, Storage::job_failed())?;
Ok(())
}
fn add_job_to(&self, id: usize, bucket_name: &str) -> Result<(), Error> {
let store = self.store.write()?;
let bucket = store.bucket::<&str, ValueBuf<Bincode<usize>>>(Some(bucket_name))?;
let mut txn = store.write_txn()?;
txn.set(
&bucket,
&id.to_string(),
Bincode::to_value_buf(self.runner_id)?,
);
txn.commit()?;
Ok(())
}
fn delete_job_from(&self, id: usize, bucket_name: &str) -> Result<(), Error> {
let store = self.store.write()?;
let bucket = store.bucket::<&str, ValueBuf<Bincode<usize>>>(Some(bucket_name))?;
let mut txn = store.write_txn()?;
match txn.del(&bucket, &id.to_string()) {
Ok(_) => (),
Err(e) => match e {
Error::NotFound => (),
e => return Err(e),
},
}
txn.commit()?;
Ok(())
}
fn buckets() -> [&'static str; 5] {
[
Storage::id_store(),
Storage::job_store(),
Storage::job_queue(),
Storage::job_failed(),
Storage::job_running(),
]
}
fn id_store() -> &'static str {
"id-store"
}
fn job_store() -> &'static str {
"job-store"
}
fn job_queue() -> &'static str {
"job-queue"
}
fn job_failed() -> &'static str {
"job-failed"
}
fn job_running() -> &'static str {
"job-running"
}
}

183
src/lib.rs
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@ -1,183 +0,0 @@
#[macro_use]
extern crate failure;
extern crate futures;
#[macro_use]
extern crate log;
extern crate serde;
#[macro_use]
extern crate serde_derive;
extern crate serde_json;
use std::collections::{HashMap, VecDeque};
use failure::Error;
use futures::future::{Future, IntoFuture};
use serde::{de::DeserializeOwned, ser::Serialize};
use serde_json::Value;
#[derive(Debug, Fail)]
pub enum JobError {
#[fail(display = "Error performing job: {}", _0)]
Processing(Error),
#[fail(display = "Could not make JSON value from processable")]
Json,
#[fail(display = "No processor available for job")]
MissingProcessor,
}
pub trait Processable: DeserializeOwned + Serialize {
fn processor(&self) -> &'static str;
}
pub trait Processor {
fn name(&self) -> &'static str;
fn process(&self, processable: Value) -> Box<Future<Item = (), Error = Error> + Send>;
}
#[derive(Deserialize, Serialize)]
pub struct JobInfo {
args: Value,
retry_count: usize,
}
impl JobInfo {
fn increment(mut self) -> Self {
self.retry_count += 1;
self
}
}
#[derive(Deserialize, Serialize)]
pub struct Jobs {
inner: HashMap<String, VecDeque<JobInfo>>,
}
impl Jobs {
fn queue<P>(&mut self, processable: P) -> Result<(), JobError>
where
P: Processable + 'static,
{
let processor = processable.processor().to_owned();
let v = serde_json::to_value(processable).map_err(|_| JobError::Json)?;
let queue = self.inner.entry(processor).or_insert(VecDeque::new());
queue.push_back(JobInfo {
args: v,
retry_count: 0,
});
Ok(())
}
fn requeue(&mut self, name: &str, job: JobInfo) {
let queue = self.inner.entry(name.to_owned()).or_insert(VecDeque::new());
queue.push_back(job.increment());
}
}
impl Default for Jobs {
fn default() -> Self {
Jobs {
inner: Default::default(),
}
}
}
pub struct Processors {
inner: HashMap<String, Box<Processor + Send + Sync + 'static>>,
jobs: Option<Jobs>,
max_retries: usize,
}
impl Processors {
pub fn new() -> Self {
Default::default()
}
pub fn max_retries(&mut self, max_retries: usize) -> &mut Self {
self.max_retries = max_retries;
self
}
pub fn register_processor<P>(&mut self, processor: P)
where
P: Processor + Send + Sync + 'static,
{
self.inner
.insert(processor.name().to_owned(), Box::new(processor));
}
pub fn queue<P>(&mut self, processable: P) -> Result<(), JobError>
where
P: Processable + 'static,
{
if let Some(ref mut jobs) = self.jobs {
jobs.queue(processable)?;
}
Ok(())
}
pub fn process(
mut self,
name: String,
job: JobInfo,
) -> impl Future<Item = Self, Error = JobError> {
let jobs = self.jobs.take().unwrap();
let processor = self.inner.remove(&name);
processor
.ok_or(JobError::MissingProcessor)
.into_future()
.and_then(move |processor| process(self, jobs, processor, job, name))
}
}
impl Default for Processors {
fn default() -> Self {
Processors {
inner: Default::default(),
jobs: Default::default(),
max_retries: 5,
}
}
}
fn process(
mut processors: Processors,
mut jobs: Jobs,
processor: Box<Processor + Send + Sync + 'static>,
job: JobInfo,
name: String,
) -> impl Future<Item = Processors, Error = JobError> {
let args = job.args.clone();
let local_name = name.clone();
let local_name_2 = name.clone();
let fut = processor.process(args).then(move |res| match res {
Ok(_) => Ok(info!("Job completed, {}", name)),
Err(e) => {
error!("Job errored, {}, {}", name, e);
Err(e)
}
});
processors.inner.insert(local_name, processor);
fut.then(move |res| {
if let Err(e) = res {
if job.retry_count < processors.max_retries {
jobs.requeue(&local_name_2, job);
} else {
error!("Job failed permanently, {}, {}", &local_name_2, e);
}
}
processors.jobs = Some(jobs);
Ok(processors)
})
}