leveldb | fast key-value storage library | Key Value Database library

by google C++ Version: 1.23 License: BSD-3-Clause

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | leveldb Summary

leveldb is a C++ 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 medium support. You can download it from GitHub.

LevelDB library documentation is online and bundled with the source code.

Support

Quality

Security

License

Reuse

Support

leveldb has a medium active ecosystem.

It has 32879 star(s) with 7330 fork(s). There are 1331 watchers for this library.

It had no major release in the last 12 months.

There are 194 open issues and 522 have been closed. On average issues are closed in 159 days. There are 88 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of leveldb is 1.23

Quality

leveldb has 0 bugs and 0 code smells.

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.

License

leveldb is licensed under the BSD-3-Clause License. This license is Permissive.

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

Reuse

leveldb releases are available to install and integrate.

Installation instructions, examples and code snippets are available.

It has 420 lines of code, 0 functions and 1 files.

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

Top functions reviewed by kandi - BETA

kandi's functional review helps you automatically verify the functionalities of the libraries and avoid rework.
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of leveldb

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

Trending Discussions on leveldb

truffle fails to install on MacOS High Sierra

Using C++ protobuf formatted structure in leveldb. set/get operations

Firebase won't run with iOS simulator. Flutter

How do I count files that deleted?

pip fails to find brew installed libs with M1 chip

How to install bob python toolkit with docker?

Flutter on M1: GoogleMapsBase & Flutter.h not found errors after moving to mac from windows

What's the underlying storage engine in Apache IoTDB?

Error: No named parameter with the name 'builder' Flutter macOS

Flutter app can run in Xcode and not in Android Studio

QUESTION

truffle fails to install on MacOS High Sierra

Asked 2022-Feb-28 at 10:23

I am trying to run this command on my Mac High Sierra (10.13.6) :

npm install -g truffle

But keep getting the following error:

...

ANSWER

Answered 2022-Feb-28 at 10:23

The above link indeed worked for me. I was using Node V17 (odd number) and have now switched to V16 and all working well now.

Source https://stackoverflow.com/questions/71038309

QUESTION

Using C++ protobuf formatted structure in leveldb. set/get operations

Asked 2022-Jan-17 at 02:17

I'd like to make a POC of using leveldb in order to store key-value table of different data types in protobuf format.

So far I was able to open the database file, and I also saw the get function with the following signature :

virtual Status Get(const ReadOptions& options, const Slice& key, std::string* value)=0

I understand that the value is actually refers to a binary string like vector and not regular alphanumeric string, so I guess it can fit for multi type primitives like string, uint, enum) but how can it support struct/class that represent protobuf layout in c++ ?

So this is my proto file that I'd like to store in the leveldb:

...

ANSWER

Answered 2022-Jan-17 at 02:17

You need to serialize the protobuf message into a binary string, i.e. SerilaizeToString, and use the Put method to write the binary string to LevelDB with a key.
Then you can use the Get method to retrieve the binary value with the given key, and parse the binary string to a protobuf message, i.e. ParseFromString.
Finally, you can get fields of the message.

Source https://stackoverflow.com/questions/70678772

QUESTION

Firebase won't run with iOS simulator. Flutter

Asked 2022-Jan-07 at 20:38

as I said in the title I'm not able to run iOS simulator with Firecloud. If I only add Firebase_core package to pubspec.yaml all works fine, but when I add cloud_firestore: ^3.1.5 I got this error:

P.s. With Android simulator all works fine.

Launching lib/main.dart on iPhone 13 in debug mode... Running Xcode build... Xcode build done. 9.3s Failed to build iOS app Error output from Xcode build: ↳ ** BUILD FAILED **

Xcode's output: ↳ /Users/luca/Desktop/prova/ios/Pods/gRPC-Core/third_party/upb/upb/port.c:2:10: fatal error: 'upb/port_def.inc' file not found #include "upb/port_def.inc" ^~~~~~~~~~~~~~~~~~ 1 error generated. /Users/luca/Desktop/prova/ios/Pods/gRPC-Core/third_party/upb/upb/msg.c:2:10: fatal error: 'upb/msg.h' file not found #include "upb/msg.h" ^~~~~~~~~~~ 1 error generated. note: Using new build system note: Planning note: Build preparation complete note: Building targets in dependency order /Users/luca/Desktop/prova/ios/Pods/Pods.xcodeproj: warning: The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0 to 15.2.99. (in target 'BoringSSL-GRPC' from project 'Pods') /Users/luca/Desktop/prova/ios/Pods/Pods.xcodeproj: warning: The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0 to 15.2.99. (in target 'abseil' from project 'Pods') /Users/luca/Desktop/prova/ios/Pods/Pods.xcodeproj: warning: The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0 to 15.2.99. (in target 'gRPC-Core' from project 'Pods') /Users/luca/Desktop/prova/ios/Pods/Pods.xcodeproj: warning: The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0 to 15.2.99. (in target 'gRPC-C++-gRPCCertificates-Cpp' from project 'Pods') /Users/luca/Desktop/prova/ios/Pods/Pods.xcodeproj: warning: The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0 to 15.2.99. (in target 'leveldb-library' from project 'Pods') /Users/luca/Desktop/prova/ios/Pods/Pods.xcodeproj: warning: The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0 to 15.2.99. (in target 'gRPC-C++' from project 'Pods')

Could not build the application for the simulator. Error launching application on iPhone 13.

Can anyone help me? I am stuck with this error since 2 weeks ago :S thanks to all.

...

ANSWER

Answered 2021-Dec-26 at 04:58

Add this line in your pod file

Source https://stackoverflow.com/questions/70481890

QUESTION

How do I count files that deleted?

Asked 2021-Dec-23 at 13:14

I want to make below script to count files that deleted. I tried a lot of methods with variables, but I didn't make something good. I need some help from users here.

Can anynone help to do?

Here is code:

...

ANSWER

Answered 2021-Dec-23 at 13:14

Just print the count of how many files you're going to remove before you remove them:

Source https://stackoverflow.com/questions/70454517

QUESTION

pip fails to find brew installed libs with M1 chip

Asked 2021-Dec-18 at 18:13

folks, with new M1 chip brew stores its libraries in the different location /opt/homebrew/ instead of /usr/local/.
And now when pip needs some packages installed by brew(in my case leveldb for plyvel)it's not able to find it until I use Rosetta brew version to put in the old directory: /usr/local/.
I've added eval "$(/opt/homebrew/bin/brew shellenv)" in my .zshrc to import brew-related vars and I thought it should do the thing but no lack.

Do you have any tips on how to handle this issue?

...

ANSWER

Answered 2021-Dec-16 at 07:57

I don't know whether there is a Right Way to do this, but one was is to pass the necessary compiler flags as an environment variable:

Source https://stackoverflow.com/questions/70375267

QUESTION

How to install bob python toolkit with docker?

Asked 2021-Nov-04 at 13:53

I'm trying to install bob.learn.em, but there is not any documented straightforward approach to install bob.

There are some very old resources like these to install bob:

https://hub.docker.com/r/artimi/bob

https://github.com/Artimi/bob_docker_image/blob/master/Dockerfile

But none of them can not install bob.learn.em or any latest bob packages.

I am unsuccessful while trying both pip and conda, the official document (https://www.idiap.ch/software/bob/docs/bob/docs/stable/install.html) doesn't work (at least for my system, I even tried conda in a docker container)

Is there any docker container or reproducible recipe for installing bob and bob packages like bob.learn.em?

errors inside anaconda3 container,

...

ANSWER

Answered 2021-Oct-22 at 21:17

Wrote this simple dockerfile.

Dockerfile

Source https://stackoverflow.com/questions/69665836

QUESTION

Flutter on M1: GoogleMapsBase & Flutter.h not found errors after moving to mac from windows

Asked 2021-Oct-21 at 13:22

I've been developing a flutter app on my windows machine for a while now and recently switched to a mac mini with an M1 chip. The app uses google maps but when I try to run it on an iOS device I get the following error:

...

ANSWER

Answered 2021-Oct-21 at 13:22

After spending literal days on this problem I "fixed" it but not in a way I'm proud of but it may work for someone facing the same issue.

What caused it I initially started the development on a Windows machine and then moved to an M1 Mac mini in order to test the app on the iOS simulator. I was prompted to install cocoa pods and then do a pod install. Sadly, when I run pod install, I was met with an error about an incompatible pod version and I panicked leading to me canceling the process. I then started trying out different solutions that I found here on StackOverflow but that only made things worse. These changes simply made me lose track of what the original issue was and thus, I didn't manage to recover from the mess. After applying the steps outlined below, I found out that the initial culprit was me not running a simple pod update command after the `pod install` one failed with the error mentioned below. Solution Here are the steps I followed to correct this issue:

Created a new flutter project
Copied the android & lib folders (since they weren't causing any issues) and also the pubspec.yml and .lock files.
Then, I copied the firebase-related files into the ios directory along with the SwiftDelegate since I made some changes in order to support google maps.
Once that was done, all I had to do was run pod install and when inevitably the pod dependency version issue arose, I simply run pod update and that fixed any issues I had with the pods.
Final step was to exclude the arm64 architecture from BOTH the Runner target and the Pods target and change the minimum ios version to 9.

That's it, once those things were done everything worked just fine.

Summary

To conclude, if you like me face a similar issue with pods on your first ever macOS experience, don't panick, update your pods and then you should be fine.

Source https://stackoverflow.com/questions/69608804

QUESTION

What's the underlying storage engine in Apache IoTDB?

Asked 2021-Oct-06 at 07:12

Dose the underlying storage engine in Apache IoTDB use other mature storage engine, like RocksDB, LevelDB or Cassandra? Or it implements its own storage engine from sratch?

...

ANSWER

Answered 2021-Oct-06 at 06:40

Apache IoTDB does not rely on any existing storage engine indeed. In fact, it has its own implementation for the datastore based on a newly developed file format tsfile (which is related to Apache Parquet). More information on the tsfile Format can be found here: http://iotdb.apache.org/SystemDesign/TsFile/Format.html

Also for metadata storage, Apache IoTDB relies on its own implementation of the known algorithms / concepts like BTrees, the write ahead log (WAL) or the Raft protocol (in Cluster mode).

In the following picture you see a sketch of the storage engine / architecture of Apache IoTDB taken from http://iotdb.apache.org/SystemDesign/StorageEngine/StorageEngine.html:

TL;DR: Apache IoTDB does not rely on existing projects but implements everything related to its storage engine completely new based on a binary file format for mass data storage.

Source https://stackoverflow.com/questions/69459338

QUESTION

Error: No named parameter with the name 'builder' Flutter macOS

Asked 2021-Oct-03 at 17:29

can someone please explain what to do to fix "Error: No named parameter with the name 'builder'."?

Code:

...

ANSWER

Answered 2021-Oct-03 at 17:29

I believe your parent class doesn't have a builder method, I also believe you need to use the child method and then builder inside of that.

Source https://stackoverflow.com/questions/69427176

QUESTION

Flutter app can run in Xcode and not in Android Studio

Asked 2021-Sep-29 at 15:32

As the title suggests, I simply cannot run my flutter app on Android Studio (using the IOS simulator). Somehow, if I run and fix all Xcode errors in Xcode itself, I am able to run it. However, when I try to run it in android studio a second later, many errors appear coming from the IOS build. There is no specific error log as the warning are always different. Here are some of the causes that I am suspicious of:

I updated to Xcode 13, which has a new build system.
I updated to a new Flutter version.
I updated to a new Android Studio Version (Arctic Fox).

I have tried many things, including:

...

ANSWER

Answered 2021-Sep-29 at 15:32

Solved after a month

The only truly important error was the following:

ld: building for iOS Simulator, but linking in dylib built for iOS, file '/Users/tomasward/Desktop/Fredi/ios/Pods/TwitterKit/iOS/TwitterKit.framework/TwitterKit' for architecture arm64

What is it actually saying? arm64 is an architecture used for physical devices, not for the simulator. So, I was trying to simulate an invalid architecture in a virtual device. I had read that I needed to exclude arm64 from my build settings in my target project. However, the missing step was to also exclude it from pods as follows:

Voilá!

Source https://stackoverflow.com/questions/69376391

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

Vulnerabilities

No vulnerabilities reported

Install leveldb

We use a database with a million entries. Each entry has a 16 byte key, and a 100 byte value. Values used by the benchmark compress to about half their original size.