Setup local Athens for proper go mod

There is a project called Athens for proxying all your go mod downloads. How to use it locally. 1. Create the following files and directories: a. /Users/d.bolgov/.ssh-athens/storage — empty directory to cache go modules b. /Users/d.bolgov/.ssh-athens/.netrc — if you prefer using .netrc

machine github.com
    login [yourlogin]
    password [yourpassword]

machine github.com

password [yourpassword]

c. /Users/d.bolgov/.ssh-athens/gitconfig/.gitconfig — if you want to substitue some urls. I personally …

Port forwarding with kubectl

If you want some kubernetes pod to forward all the traffic to you local machine, you can do this: 1. get pod id with

kubectl --kubeconfig <config> get po -lapp=<pod_label_app> -Lversion,cfg,infra-cfg

1	kubectl --kubeconfig <config> get po -lapp=<pod_label_app> -Lversion,cfg,infra-cfg

2. forward exact port from it to you localhost with

kubectl --kubeconfig <config> port-forward <pod-id> localhost_port:pod_port

1	kubectl --kubeconfig <config> port-forward <pod-id> localhost_port:pod_port

And you can request you localhost to reach pod on selected port.

Installing protobuf tools on MacOS

Installing protoc

brew install protobuf

1	brew install protobuf

Or follow different instructions. Installing grpc_cli Option 1. Easy way.

brew tap grpc/grpc
brew install --with-plugins grpc

1 2	brew tap grpc/grpc brew install --with-plugins grpc

It is described here — https://github.com/grpc/homebrew-grpc. Option 2. Hard way — using cmake and make. NOT RECOMMENDED.

brew install autoconf automake libtool shtool cmake

git clone -b $(curl -L https://grpc.io/release) https://github.com/grpc/grpc
cd grpc
git submodule update --init

mkdir -p cmake/build
cd cmake/build
cmake ../..
make

gRPC_INSTALL=ON make install
# and continue accordgin to https://github.com/grpc/grpc/blob/master/BUILDING.md

brew install autoconf automake libtool shtool cmake

git clone -b $(curl -L https://grpc.io/release) https://github.com/grpc/grpc

cd grpc

git submodule update --init

mkdir -p cmake/build

cd cmake/build

cmake ../..

make

gRPC_INSTALL=ON make install

# and continue accordgin to https://github.com/grpc/grpc/blob/master/BUILDING.md

Or follow these instructions

Pros and cons of DynamoDB

What the author suggests is to use it in cases when there are not so many writes to DB and where eventual consistency is fine for the app. The writes are pretty expensive after all and could lead to problems with eventual consistency. And the main issue from my side is that DynamoDB is a …

Nice talk about concurrency in Go

Another good talk. It’s not only about channels, but also about atomics and patterns around ti. https://www.youtube.com/watch?v=YEKjSzIwAdA

How to choose a partition key for DynamoDB

Here’s an article about how to do it right: https://aws.amazon.com/blogs/database/choosing-the-right-dynamodb-partition-key/. The main ideas — partition key should have a good cardinality, but at the same time it should be queried easily as all the queries to DynamoDB should start with PartitionKey=…, as they are hashes.

Checking restart problems with mysql on centos

You probable installed MySQL with a help of article like this — https://phoenixnap.com/kb/how-to-install-mysql-on-centos-7 So your mysql is controlled by systemctl. Check current status — sudo systemctl status mysqld. Start service — sudo systemctl start mysqld Logs for systemctl are here — sudo journalctl -xe Logs for mysql can be found here — /var/log/mysqld.log. Configs are …

DynamoDB videos list

AWS decided to start a series of videos on DynamoDB usage. First 5 episodes were published on Youtube, and I made a playlist for them: https://www.youtube.com/playlist?list=PLfgkuLYEOvGN95-dbdS_mT4bktQjkw2aT

Debugging site in chrome from android device

Download platform tools from here — https://developer.android.com/studio/releases/platform-tools.html. Run ADB with command

./adb start-server
# when you finished, stop it with
# ./adb kill-server

./adb start-server

# when you finished, stop it with

# ./adb kill-server

Configure your phone according to this article — https://developer.android.com/studio/debug/dev-options.html (for my specific it is https://www.syncios.com/android/how-to-debug-xiaomi-mi-max-mix.html). Connect your phone to the computer with USB cable. Follow instructions from here — https://developers.google.com/web/tools/chrome-devtools/remote-debugging. When finished, stop ADB and turn off all the developer features on your …

Make your bot for telegram using go

It’s really not that difficult. Here are the docs: https://core.telegram.org/bots https://core.telegram.org/bots/api Here is a simple library in go for telegram — https://github.com/go-telegram-bot-api/telegram-bot-api/ (too simple, from my point of view, does not cover all functionality, but okay). And here is a skeletton for making your bots if you want it as just standalone binary — https://github.com/nezorflame/example-telegram-bot/