leveldb | LevelDB for Ruby | Key Value Database library

 by   DAddYE Ruby Version: Current License: MIT

kandi X-RAY | leveldb Summary

kandi X-RAY | leveldb Summary

leveldb is a Ruby library typically used in Database, Key Value Database applications. leveldb has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

LevelDB is a database library (C++, 350 kB) written at Google. It is an embedded database. LevelDB is a persistent ordered map. LevelDB stores keys and values in arbitrary byte arrays, and data is sorted by key. It supports batching writes, forward and backward iteration, and compression of the data via Google's Snappy compression library. Still, LevelDB is not a SQL database. (Wikipedia).
Support
    Quality
      Security
        License
          Reuse

            kandi-support Support

              leveldb has a low active ecosystem.
              It has 123 star(s) with 14 fork(s). There are 9 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 4 open issues and 9 have been closed. On average issues are closed in 58 days. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of leveldb is current.

            kandi-Quality Quality

              leveldb has 0 bugs and 0 code smells.

            kandi-Security Security

              leveldb has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              leveldb code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              leveldb is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              leveldb releases are not available. You will need to build from source code and install.
              Installation instructions are not available. Examples and code snippets are available.
              leveldb saves you 321 person hours of effort in developing the same functionality from scratch.
              It has 771 lines of code, 83 functions and 15 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed leveldb and discovered the below as its top functions. This is intended to give you an instant insight into leveldb implemented functionality, and help decide if they suit your requirements.
            • Create a new object .
            • Initializes a new batch .
            • Close the database .
            • Get the value from the database .
            • Fetch value by default
            • Move the next iterator to the next index .
            • Move the next item to the next loop .
            • Called when the error occurs .
            • Read from the input stream .
            • Reverse the first operation .
            Get all kandi verified functions for this library.

            leveldb Key Features

            No Key Features are available at this moment for leveldb.

            leveldb Examples and Code Snippets

            No Code Snippets are available at this moment for leveldb.

            Community Discussions

            QUESTION

            Cannot create HyperLedger network
            Asked 2021-Jun-07 at 16:20

            I'm trying to generate hyperledger channel, when i run it on local works without problems, but when i run on AWS ec2, i ve problems, there its my problem:

            ...

            ANSWER

            Answered 2021-Jun-07 at 16:20

            Low memory on machine, that was problem

            Source https://stackoverflow.com/questions/67873816

            QUESTION

            Where does the history for getHistoryForKey came from?
            Asked 2021-Jun-01 at 16:24

            When a Hyperledger Fabric smart contract calls getHistoryForKey it receive the updates for a particular key. I'm wondering where does this information come from? It's not stored in the world-view (levelDB, CouchDB) so it must be retrieved from the blockchain. Does the smart contract has access to blockchain? What am I missing?

            ...

            ANSWER

            Answered 2021-Jun-01 at 16:24

            There is a setting which enables the history database for peers. It is enabled by default and is a a physically separate database from world state.

            Each channel has it's own history database. The history database uses LevelDB (an embedded database) for storage.

            The history database stores key/txid/blocknum for each update. When you call GetHistoryForKey, it iterates through the history db and then retrieves the values from block storage.

            Source https://stackoverflow.com/questions/67743229

            QUESTION

            How can I export my Firestore database from a Google Storage Bucket into a Json file
            Asked 2021-Apr-26 at 22:53

            Here's the situation: I have a Firestore Database. I download it on a daily basis to a Google Cloud Storage Bucket as a backup. If I want to download it locally, I do it using this command gsutil -m cp -r gs://BUCKET_PATH "DESTINATION_PATH" and it works fine.

            MY PROBLEM: the format of the Bucket I download is LevelDB (I think). On my machine, it looks like this :

            For example, this is my /users collection in Firestore when I download it through Google Storage. In the folder, I have multiple binary files ("output-...") and a file ( here: "all_namespaces_kind_users") for metadata.

            MY GOAL: I want to be able to read my database in a json file.

            MY TRIES:

            ...

            ANSWER

            Answered 2021-Apr-26 at 22:53

            I have created a converter in Python 3 which could convert firestore export files into JSON files firestore-export-json. The package provides a simple CLI command to covert the file.

            Source https://stackoverflow.com/questions/66154067

            QUESTION

            import error after upgrade to airflow2.0.2
            Asked 2021-Apr-22 at 12:15

            Received an import error after upgrading to airflow2.0.2-python3.7 image. Package seems to be installed, not sure what is causing the issue and how to fix it. Tried to uninstalling and reinstalling the packages but that does not work either.

            ...

            ANSWER

            Answered 2021-Apr-22 at 12:15

            It's a bug (harmless) in definition of the google provider 2.2.0 in fact:

            In provider.yaml:

            airflow.providers.google.common.hooks.leveldb.LevelDBHook

            should be:

            airflow.providers.google.leveldb.hooks.LevelDBHook

            This was fixed in https://github.com/apache/airflow/pull/15453 and will be available in next version of google provider.

            Source https://stackoverflow.com/questions/67202649

            QUESTION

            Not able to write data into a leveldb file using batch
            Asked 2021-Apr-17 at 15:11

            I just started to learn level.db using the level module in node.js

            ...

            ANSWER

            Answered 2021-Apr-17 at 15:11

            From the GitHub page of leveldb here, we can see an example :

            Source https://stackoverflow.com/questions/67137981

            QUESTION

            Discord malware
            Asked 2021-Apr-13 at 10:12

            A friend of mine contacted me with a problem he has been having with Discord. Windows asks what program the code below should be run with and the default is Discord. Every time Discord is run, this chunk of code is run:

            ...

            ANSWER

            Answered 2021-Feb-18 at 04:13

            that is malware, not only a token logger but also stealing Chrome, Brave, Opera and Yandex passwords. uninstall that immediately and change all your passwords

            yt channel of creator: https://www.youtube.com/channel/UCydMtuzGQ0kFPhK2hIXFf6A

            update: ap it turns out, it also steals your ip, yay!

            Source https://stackoverflow.com/questions/66192207

            QUESTION

            symbol(s) not found for architecture armv7 flutter
            Asked 2021-Apr-03 at 06:00
             ld: symbol(s) not found for architecture armv7
                clang: error: linker command failed with exit code 1 (use -v to see invocation)
                ld: warning: dylib (/Users/Shared/store/build/ios/Release-iphoneos/abseil/absl.framework/absl) was built for newer iOS version (11.0) than being linked (10.0)
                ld: warning: dylib (/Users/Shared/store/build/ios/Release-iphoneos/gRPC-C++/grpcpp.framework/grpcpp) was built for newer iOS version (11.0) than being linked (10.0)
                ld: warning: dylib (/Users/Shared/store/build/ios/Release-iphoneos/leveldb-library/leveldb.framework/leveldb) was built for newer iOS version (11.0) than being linked (10.0)
                note: Using new build system
                note: Building targets in parallel
                note: Planning build
                note: Constructing build description
            
            Encountered error while building for device.
            
            ...

            ANSWER

            Answered 2021-Apr-03 at 06:00

            Run flutter upgrade to upgrade to most recent version of Flutter. After that, flutter clean and build again. This should solve your problem.

            Source https://stackoverflow.com/questions/66905349

            QUESTION

            Restore Back up From Hyperledger Fabric v2.0
            Asked 2021-Mar-31 at 07:43

            https://www.devprovider.com/how-to-take-backup-from-hyperledger-fabric/

            https://www.devprovider.com/how-to-restore-hyperledger-fabric-from-backup/

            I follow this 2 tutorials for back up and restore my Blockchain,I did everything the same except:

            Make back up:

            1:

            ...

            ANSWER

            Answered 2021-Mar-31 at 07:13

            according to your describe,in the tourial ,fabric version is v1.4.X,and the fabric you now use is v2.x.x,so in v1.4.x the test script is byfn.sh and in v2.x.x the test script is network.sh,these two scripts are different.

            if you want to backup a fabric network and restore,you need just backup crypto-config(organizations in v2.x.x),ledger data which obtain from /var/hyperledger/fabric of docker container,and start your orderer and peer container ,you need not create channel or join channel ,you can query and invoke chaincode.

            I have answer another question about restore fabric network,you can reference it In Hyperledger Fabric, is there a way to reuse the data of previous network?

            --------------new answer-------------------------------

            if you exec you peer chaincode invoke command in terminal,you should add this env,and you can invoke success.

            Source https://stackoverflow.com/questions/66866923

            QUESTION

            HyperLedger Fabric v2.3 Endorsement Policy did not come into action
            Asked 2021-Mar-25 at 14:48

            I was trying to test out the endorsement policy feature of Fabric with the Running a Fabric Application tutorial and I have encountered a few questions/issues.

            Instead of using LevelDB, I up the network using CouchDB by changing the command to ./network.sh up createChannel -c mychannel -ca -s couchdb. After the call to InitLedger, I manually edit asset2's "Size" field value to another random value through fauxton, accessed from http://127.0.0.1:5984/_utils/ (couchdb0, which belongs to organization 1). So at this point, asset2 has 2 different value sitting in couchdb0 and couchdb1.

            Then I invoke the UpdateAsset function in the chaincode to update asset2's value. I was expecting an error about endorsement policy is not met or something to be thrown as the different value of asset2 in couchdb0 and couchdb1 should results in different RW set.

            ...

            ANSWER

            Answered 2021-Mar-25 at 14:48

            This is working as expected. You updated the size field but not the version field. The read set check only checks the version field. It is up to the chaincode to check other fields such as asset ownership (and size, if there are business rules around that, such as size not being allowed to change in an update). The asset transfer chaincode is a trivial sample and only checks for asset existence in state database by key. So in your case chaincode execution succeeded because it passed the asset existence check, endorsements succeeded, and validation succeeded since both endorsements were over the same read set (version) and write set.

            You get the CouchDB warning because the internal CouchDB revision number was different due to your external update, but this is not a fatal problem and gets resolved by a retry (CouchDB internal revision numbers are not guaranteed to be the same across state databases since peer may update the same state multiple times, e.g. in crash recovery scenarios).

            Source https://stackoverflow.com/questions/66774735

            QUESTION

            Flutter project - XCode build failed
            Asked 2021-Feb-10 at 11:01

            I've been dealing with many problems for a few days. I updated the places I need to update in the pod file. I tried too mant methods to fix my errors. I try to delete my podfile update my podfile, i tried to pod update Firebase/Firestore.

            Then i tried to this method to run my app : Run this commands

            ...

            ANSWER

            Answered 2021-Feb-05 at 11:15

            I faced the same issue, except my iOS deployment target was set to 9.

            Navigate to the folder when you have your Runner XCode project.

            Run this command

            Source https://stackoverflow.com/questions/66058133

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

            Vulnerabilities

            No vulnerabilities reported

            Install leveldb

            You can download it from GitHub.
            On a UNIX-like operating system, using your system’s package manager is easiest. However, the packaged Ruby version may not be the newest one. There is also an installer for Windows. Managers help you to switch between multiple Ruby versions on your system. Installers can be used to install a specific or multiple Ruby versions. Please refer ruby-lang.org for more information.

            Support

            Fork itCreate your feature branch (git checkout -b my-new-feature)Commit your changes (git commit -am 'Add some feature')Push to the branch (git push origin my-new-feature)Create new Pull Request
            Find more information at:

            Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items

            Find more libraries
            CLONE
          • HTTPS

            https://github.com/DAddYE/leveldb.git

          • CLI

            gh repo clone DAddYE/leveldb

          • sshUrl

            git@github.com:DAddYE/leveldb.git

          • Stay Updated

            Subscribe to our newsletter for trending solutions and developer bootcamps

            Agree to Sign up and Terms & Conditions

            Share this Page

            share link