restq 0.1.1

Adding arguments into the default realm

Add the argument “ls -lah” into the default realm.

> restq add "ls -lah"

If we want to refer to a group of commands we can tag a command (even if it already exists).

Tag the argument “ls -lah” with a label of ‘work’.

> restq add --tags=work "ls -lah"

Add another argument to the realm, but this time we’ll tag it with work and fun.

> restq add --tags=work,fun  pwd

Checkout the status of the realm.

> restq status
Status of realm default:
Contains 2 tags with 2 jobs
Defined queues: 0

Time to add pwd to another queue.

> restq add --queue=1 pwd
>
> restq status
Status of realm default:
Contains 2 tags with 2 jobs
Defined queues: 1, 0

Pulling (or doing a checkout) of arguments for execution

Continuation from the previous example.

Pull and execute a maximum of two arguments from the default realm. After the default time out, these arguments will be available for checkout once again.

> while read i; do eval "$i"; done < <(restq pull --count=2)
drwxr-xr-x 9 mick mick 4.0K Jul 18 08:01 .
drwxrwxr-x 9 mick mick 4.0K Jul 14 03:07 ..
drwxrwxr-x 3 mick mick 4.0K Jul 12 00:04 docs
-rw-rw-r-- 1 mick mick   72 Jul 12 00:04 MANIFEST.in
-rw-rw-r-- 1 mick mick 3.7K Jul 12 00:04 README.rst
drwxrwxr-x 2 mick mick 4.0K Jul 17 23:13 restq
-rw-rw-r-- 1 mick mick 2.1K Jul 17 19:57 setup.py
drwxrwxr-x 2 mick mick 4.0K Jul 12 00:04 tests
-rw-rw-r-- 1 mick mick  321 Jul 12 00:04 .travis.yml
/home/mick/work/restq

The argument pwd was placed into two queues. The next pull will see pwd being dequeued from queue 1.

> restq pull
pwd

Lets check the status of the pwd argument since checkout. This shows what queues a specific argument is in, what tags it has, and how long it has been since it was checked out (pulled).

> restq status arg pwd
Status of argument pwd:
Tagged with: work
queue id | (s) since dequeue
     1 | 35.22
     0 | 454.49

Time to remove pwd from our realm… We’re done with this argument and we no longer require it for execution. You will notice that the fun tag no longer exists in the realm as it was only attached to pwd.

> restq remove arg pwd
>

The default lease time for a dequeue of an argument is 600s. After this expiry time, ‘ls -lah’ will once again be available for dequeue.

> restq pull
ls -lah

How to distribute a shell script for execution

Add ‘work.sh’ script into the default realm.

> restq add --file=work.sh "chmod +x work.sh; ./work.sh"

Now when this job is dequeued using the restq cli, the path ‘./work.sh’ will be written to using the data read from the original ‘work.sh’ and the arguments will be written out to stdout.

> eval "`restq pull`"

The following is an example of a script that could be deployed across multiple machines to continuously pull and execute jobs that have been added into the default realm.

> while [ 1 ]; do
> while read i; do eval "$i"; done < <(restq pull);
> sleep 1;
> done