MY GO EXAMPLES

A place to keep my go examples.

Table of Contents

• ARCHITECTURES
  • BLOCKCHAIN
  • SCRAPING
• CGO
  • C CODE
• CLIENT/SERVER
  • gRPC
  • HTTP
  • TCP/IP
• CLOUD SERVICE PROVIDERS
  • GOOGLE CLOUD PLATFORM
  • MICROSOFT AZURE
• COMMON GO
  • ERROR REPORTING
  • FLAGS
  • LOGGING
  • MY GENERIC GO TEMPLATE
  • TESTING
• CRYPTOGRAPHY
  • ASYMMETRIC CRYPTOGRAPHY
  • HASHING
  • SYMMETRIC CRYPTOGRAPHY
• DATABASES
  • NON-RELATIONAL
  • RELATIONAL
• FUNCTIONS, METHODS AND INTERFACES
  • FUNCTIONS
  • METHODS
  • INTERFACES
• GO RUNTIME
  • GOROUTINES
  • INTERACT GO RUNTIME
  • INTERACT HOST OS
• INPUT/OUTPUT
  • IO READER
  • IO WRITER
• IN-PROCESS COMMUNICATION
  • SHARED MEMORY
  • MESSAGE PASSING
• INTER-PROCESS COMMUNICATION (IPC)
  • SHARED MEMORY
  • MESSAGE PASSING
• IoT
  • RASPBERRY PI
• MODULES AND PACKAGES
  • LOCAL PACKAGES
  • REMOTE PACKAGES
• STANDARD GO PACKAGES

Documentation and Reference

• go
• go standard library
• my-go-packages
• my-go-tools
• This repos github webpage built with concourse

ARCHITECTURES

• BLOCKCHAIN

  • bitcoin-ledger

    Demonstrates a bitcoin ledger in a blockchain using the unspent transaction output model.

  • create-bitcoin-address-from-ecdsa-publickey

    Create a bitcoin address from your ecdsa public key using the crypto/ecdsa standard package.

  • single-node-blockchain-with-REST

    A simple single node sha256 blockchain with a REST JSON API (to view (GET) the blockchain and add (POST) a block).

• WEB SCRAPING

  • [web scrape twitter for ???]

CGO

• C CODE

  • simple-c-code

    A very simple example to show you how to write a c function in go.

  • simple-c-code-using-stdio

    A c function in go using stdio.h for printf.

CLIENT/SERVER

• gRPC

  • Coming soon.

• HTTP

  • Coming soon.

• TCP/IP

  • Coming soon.

CLOUD SERVICE PROVIDERS

• GOOGLE CLOUD PLATFORM

  • Coming soon.

• MICROSOFT AZURE

  • Coming soon.

COMMON GO

• ERROR REPORTING

  • error-example

  Error Handling using the standard errors standard package.

• FLAGS

  • flags

    The flag standard package makes it easy to implement command-line flag parsing.

• LOGGING

  • jeffs-logger

    Logging using my github.com/JeffDeCola/my-go-packages/golang/logger which uses the structured logging log/slog standard package.

• MY GENERIC GO TEMPLATE

  • jeffs-basic-go-template

    A simple go template with flags, logging & error handling.

• TESTING

  • Coming soon.

CRYPTOGRAPHY

• ASYMMETRIC CRYPTOGRAPHY (Great for digital signatures (verify sender) and receiving encrypted data)

  • Coming soon.

• HASHING (Great for getting fingerprints)

  • Coming soon.

• SYMMETRIC CRYPTOGRAPHY (Using the same key to encrypt and decrypt)

  • Coming soon.

DATABASES

• NON-RELATIONAL

  • Coming soon.

• RELATIONAL

  • Coming soon.

FUNCTIONS, METHODS AND INTERFACES

• FUNCTIONS

  • functions

    Using functions to calculate the area of a rectangle and circle.

  • functions-pointers-arguments

    Using functions to calculate the area of a rectangle and circle by passing pointers.

• METHODS

  • methods

    Using methods to calculate the area of a rectangle and circle.

  • methods-pointers-arguments

    Using methods to calculate the area of a rectangle and circle by passing pointers.

  • methods-pointers-receivers

    Using methods to calculate the area of a rectangle and circle by passing pointers and using pointer receivers.

• INTERFACES

  • interfaces

    Using an interface to calculate the area of a rectangle and circle.

  • interfaces-pointers-arguments

    Using an interface to calculate the area of a rectangle and circle by passing pointers.

  • interfaces-pointer-receivers

    Using an interface to calculate the area of a rectangle and circle by passing pointers and using pointer receivers.

  • shapes-package

    Using an interface to calculate and manipulate simple 2D and 3D geometric shapes.

GO RUNTIME

• GO ROUTINES

  • goroutines-multi-core

    Concurrency across multiples cores. You can play around with workers, threads, cpus/cores and nice to find the fastest performance. It will find the total number of prime numbers within a range. Lightweight goroutines are amazing.

  • goroutines-waitgroup

    Concurrency using a waitgroup (waiting for a collection of goroutines to finish).

  • goroutines-worker-pools

    Concurrency using worker pools.

• INTERACT GO RUNTIME

  • simple-go-runtime-interactions

    A few go runtime interactions using the runtime standard package.

• INTERACT HOST OS

  • simple-external-commands

    Run a few os commands using the os/exec standard package.

  • simple-os-interactions

    A few os interactions using the syscall package.

INPUT/OUTPUT

• IO READER

  • io-reader

    Read data (a stream of bytes) from a string, buffer, file, stdin and a pipe to a buffer using the io standard package.

  • io-reader-simple

    Read data (a stream of bytes) from a buffer to a buffer using the io standard package.

  • read-file

    Read a file (*os.File) to a buffer.

  • read-user-input

    Read user input (os.Stdin) to a buffer (using Read method) and string (using Fscan).

• IO WRITER

  • io-writer

    Write data (a stream of bytes) to a buffer, file, stdout and a pipe from a buffer using the io standard package.

  • io-writer-simple

    Write data (a stream of bytes) to a buffer from a buffer using the io standard package.

IN-PROCESS COMMUNICATION

• SHARED MEMORY

  • ASYNCHRONOUS

    • Coming soon.

  • SYNCHRONOUS

    • pipes-unnamed-simple

      A pipe provides a uni-directional communication channel. This is a very simple example of an unnamed pipe.

    • pipes-unnamed

      This is a more robust example of an unnamed pipe showing multiple reads.

    • pipes-unnamed-io

      This example of an unnamed pipe connects an io.Writer and io.Reader.

• MESSAGE PASSING

  • ASYNCHRONOUS

    • channels-buffered

      Buffered channels are uni-directional, asynchronous with no blocking.

  • SYNCHRONOUS

    • channels-unbuffered

      Unbuffered channels are uni-directional, synchronous with blocking.

INTER-PROCESS COMMUNICATION (IPC)

• SHARED MEMORY

  • ASYNCHRONOUS

    • Coming soon.

  • SYNCHRONOUS

    • pipes-named

      Sending data over a named-pipe (FIFO) from one process to another process.

• MESSAGE PASSING

  • OPERATING SYSTEM

    • ASYNCHRONOUS

      • message-queues

        tbd.

      • pub-sub-nats-os

        tbd.

      • tcp

        tbd.

    • SYNCHRONOUS

      • grpc-os

        tbd.

  • NETWORK

    • ASYNCHRONOUS

      • pub-sub-nats-network

        tbd.

      • tcp-ip

        tbd.

    • SYNCHRONOUS

      • grpc-network

        tbd.

      • rest

        tbd.

IoT

• RASPBERRY PI

  • blink-led-raspberry-pi-gpio-periph

    GPIO OUTPUT - Blink an LED via a Raspberry Pi GPIO using the periph.io/... packages.

  • push-button-raspberry-pi-gpio-periph

    GPIO INPUT - Push a button via a Raspberry Pi GPIO using the periph.io/... packages.

  • toggle-led-with-button-raspberry-pi-gpio-periph

    Toggle an LED with a button push via a Raspberry Pi GPIO using the periph.io/... packages.

MODULES AND PACKAGES

• LOCAL PACKAGES

  • module-with-local-package

    A go module with a local package.

• REMOTE PACKAGES

  • module-with-remote-package

    A go module with a remote (public) package.

STANDARD GO PACKAGES

• archive
  • tar
  • zip
• bufio
• bytes
• cmp
• compress
  • bzip2
  • flate
  • gzip
  • lzw
  • zlib
• container
  • heap
  • list
  • ring
• context
• crypto
  • aes - encryptfile tool, decryptfile tool
  • ecdsa - create-bitcoin-address-from-ecdsa-publickey
  • elliptic - create-bitcoin-address-from-ecdsa-publickey
  • md5 - md5-hash-file tool
  • rand - create-bitcoin-address-from-ecdsa-publickey
  • sha256 - create-bitcoin-address-from-ecdsa-publickey, sha256-hash-file tool
  • x509 - create-bitcoin-address-from-ecdsa-publickey
  • etc...
• database
  • sql
  • sql-driver
• debug
  • buildinfo
  • dwarf
  • etc...
• embed
• encoding
  • hex - create-bitcoin-address-from-ecdsa-publickey
  • pem - create-bitcoin-address-from-ecdsa-publickey
  • etc...
• errors - error-example
• expvar
• flag - flags
• fmt
• go
  • ast
  • build
  • etc...
• hash
  • adler32
  • crc32
  • crc64
  • fnv
  • maphash
• html
  • template
• image
  • color
  • color/palette
  • draw
  • gif
  • jpeg
  • png
• index
  • suffixarray
• io - io-reader, io-reader-simple, io-writer, io-writer-simple
  • fs
  • ioutil
• iter
• log
  • slog - jeffs-logger
  • syslog
• maps
• math
  • big
  • bits
  • cmplx
  • rand
  • rand/v2
• mime
  • multipart
  • quotedprintable
• net
  • http
  • http/cgi
  • etc.,,
• os
  • exec - simple-external-commands
  • signal
  • user
• path
  • filepath
• reflect - create-bitcoin-address-from-ecdsa-publickey
• regexp (syntax)
• runtime - simple-go-runtime-interactions
  • cgo
  • coverage
  • etc...
• slices
• sort
• strconv
• strings
• structs
• sync (atomic)
• syscall - simple-os-interactions
  • js
• testing
  • fstest
  • iotest
  • quick
  • slogtest
  • synctest
• text
  • scanner
  • tabwriter
  • template
  • template/parse
• time
  • tzdata
• unicode
  • utf1
  • utf8
• unique
• unsafe
• weak