redis-lock | Pessimistic locking using Redis | Crawler library

by mlanett Ruby Version: Current License: MIT

X-Ray Key Features Code Snippets Community Discussions(2)Vulnerabilities Install Support

kandi X-RAY | redis-lock Summary

redis-lock is a Ruby library typically used in Automation, Crawler applications. redis-lock has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Pessimistic locking using Redis

Support

Quality

Security

License

Reuse

Support

redis-lock has a low active ecosystem.

It has 108 star(s) with 31 fork(s). There are 5 watchers for this library.

It had no major release in the last 6 months.

There are 5 open issues and 5 have been closed. On average issues are closed in 374 days. There are 2 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of redis-lock is current.

Quality

redis-lock has 0 bugs and 0 code smells.

Security

redis-lock has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

redis-lock code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

redis-lock is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

redis-lock releases are not available. You will need to build from source code and install.

Installation instructions, examples and code snippets are available.

redis-lock saves you 185 person hours of effort in developing the same functionality from scratch.

It has 456 lines of code, 29 functions and 7 files.

It has medium code complexity. Code complexity directly impacts maintainability of the code.

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redis-lock Key Features

No Key Features are available at this moment for redis-lock.

redis-lock Examples and Code Snippets

No Code Snippets are available at this moment for redis-lock.

Community Discussions

Trending Discussions on redis-lock

How to avoid two concurrent API requests breaking the logic behind document validation?

redis locking: redispy vs python-redis-lock

QUESTION

How to avoid two concurrent API requests breaking the logic behind document validation?

Asked 2019-Jun-07 at 09:27

I have an API that in order to insert a new item it needs to be validated. The validation basically is a type validator(string, number, Date, e.t.c) and queries the database that checks if the "user" has an "item" in the same date, which if it does the validation is unsuccessful.

Pseudocode goes like this:

...

ANSWER

Answered 2019-Apr-11 at 10:04

You should create a composite index or a composite primary key that includes the id_user and the start_date fields. This will ensure that no documents for the same user with the same date can be created, and the database will throw an error if you'll try to do it. Composite index with mongoose

You could also use transactions. To do it, you should execute the find and the create methods inside a transaction, to ensure that no concurrent queries on the same document will be executed. Mongoose transactions tutorial

More infos

I would go with an unique composite index, that in your specific case should be something like

Source https://stackoverflow.com/questions/55629269

QUESTION

redis locking: redispy vs python-redis-lock

Asked 2018-Sep-21 at 23:04

Except that python-redis-lock module provides contextmanager for the lock object - what are the differences when compared to the lock object you get from redispy module? what is so special about python-redis-lock?

...

ANSWER

Answered 2018-Sep-21 at 23:04

I think the context manager is not the major difference here, because if you see code of redis-py Lock they have the __enter__ and __exit__ added in there.

Both the Lock's seem to use SETNX for acquiring the lock:

python-redis-lock: Github
redis-py Lock: Github

The major difference I saw in there was the way blocking the threads work.

In case of python-redis-lock they have been using BLPOP mechanism to block the thread, which to me seems like using redis's own version of blocking mechanism. Github code

Something like:

timed_out = not self._client.blpop(self._signal, blpop_timeout) and timeout

In case of redis-py they seem use time module and its sleep method to block the thread to check whether the blocking has timedout.

Something like:

Source https://stackoverflow.com/questions/52295704

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install redis-lock

Add this line to your application's Gemfile:.

Support

Fork itCreate your feature branch (git checkout -b my-new-feature)Commit your changes (git commit -am 'Added some feature')Push to the branch (git push origin my-new-feature)Create new Pull Request

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