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Articles hosted on my blog

Home Page: https://blog.depado.eu

License: MIT License

Go 92.09% Makefile 1.13% Dockerfile 2.44% HTML 4.33%

articles ci-cd golang stuff

articles's Issues

First Article

This is the comment issue for the First Article article.

Setting up Caddy Server on Debian

This is the comment issue for the Setting up Caddy Server on Debian article.

DialogFlow : A complete guide

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Handle Dynamic Subdomains with Flask and Nginx

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about your GO program checklist

Hi,

viper can be replaced by the simplest github.com/namsral/flag if you don't need a config file (config files are evil, see 12 factors)
dep is "deprecated", use modules
cobra have a strong application layout which makes your go code far less readable
you forgot to add metrics (using the prometheus endpoint and github.com/prometheus/client_golang/prometheus). This is useful if your application is not a commandline tool
you forgot to add tracing, which can also be helpful if it's not a commandline. Opentracing, Jaeger, Zipkin... or Opencensu which offer all of the above plus many other things

I would have commented on the blog directly, but your oauth tool against Github is requesting read and write to all my public repos, which is not going to happen.

Gorm Gotchas

This is the comment issue for the Gorm Gotchas article.

Smallblog Cheatsheet

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Closeable time ticker and multiple receivers in Go

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Dining Philosophers : Rust vs Go

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Interesting Projects

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Scaffold a Flask Project

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Embedding resources with rice.go in a Gin project

This is the comment issue for the Embedding resources with rice.go in a Gin project article.

Buffer-less Multipart POST in Golang

This is the comment issue for the Buffer-less Multipart POST in Golang article.

QOR Admin Tutorial

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CI/CD with Drone, Kubernetes and Helm - Part 3

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Copy files and directories in Go

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Cuite Playlists

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CI/CD with Drone, Kubernetes and Helm - Part 1

This is the comment issue for the CI/CD with Drone, Kubernetes and Helm - Part 1 article.

gin-validation for an array of struct

Hi @depado ,
Greetings, I saw your blog for gin-validation and it helped in my use case.
But I am unable to use it if the validation is done on an array of struct.

My sample code

package main

import (
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"reflect"
	"strings"

	"github.com/gin-gonic/gin"
	"github.com/gin-gonic/gin/binding"
	"github.com/go-playground/validator/v10"
)

type User struct {
	Email string `json:"email" form:"e-mail" binding:"required"`
	Name  string `json:"name" binding:"required"`
}

func main() {
	route := gin.Default()
	if v, ok := binding.Validator.Engine().(*validator.Validate); ok {
		v.RegisterTagNameFunc(func(fld reflect.StructField) string {
			name := strings.SplitN(fld.Tag.Get("json"), ",", 2)[0]
			if name == "-" {
				return ""
			}
			return name
		})
	}
	route.POST("/user", validateUser)
	route.Run(":8085")
}
func validateUser(c *gin.Context) {
	var u []User
	if err := c.ShouldBindJSON(&u); err == nil {
		c.JSON(http.StatusOK, gin.H{"message": "User validation successful."})
	} else {
		fmt.Println(err)
		var verr validator.ValidationErrors
		var jsErr *json.UnmarshalTypeError

		if errors.As(err, &verr) {
			c.JSON(http.StatusBadRequest, gin.H{"errors": Descriptive(verr)})
			return
		} else if errors.As(err, &jsErr) {
			c.JSON(http.StatusBadRequest, gin.H{"errors": MarshalErr(*jsErr)})
			return
		}
	}
}

func Simple(verr validator.ValidationErrors) map[string]string {
	errs := make(map[string]string)
	for _, f := range verr {
		err := f.ActualTag()

		if f.Param() != "" {
			err = fmt.Sprintf("%s=%s", err, f.Param())
		}
		errs[f.Field()] = err + "," + f.Kind().String()
		fmt.Println(errs)
	}
	return errs

}

type ValidationError struct {
	Field  string `json:"field"`
	Type   string `json:"type"`
	Reason string `json:"reason"`
}
func MarshalErr(jsErr json.UnmarshalTypeError) ValidationError {
	errs := ValidationError{}
	errs.Field=jsErr.Field
	errs.Reason="invalid type"
	errs.Type=jsErr.Type.String()
	return errs
}
func Descriptive(verr validator.ValidationErrors) []ValidationError {
	errs := []ValidationError{}

	for _, f := range verr {
		fmt.Println(f)
		err := f.ActualTag()
		if f.Param() != "" {
			err = fmt.Sprintf("%s=%s", err, f.Param())
		}
		errs = append(errs, ValidationError{Field: f.Field(), Reason: err, Type: f.Type().Name()})
	}

	return errs
}

Test Input

curl --location --request POST 'http://localhost:8085/user' \
--header 'content-type: application/json' \
--data-raw '[
    {
        "email": "[email protected]",
        "name": "Me"
    },
    {
        "email": "[email protected]"
    }
]'

Expected output

"errors": [
        {
            "field": "name",
            "type": "string",
            "reason": "required"
        }
    ]

Can you please help me with it.

Smallblog Documentation

This is the comment issue for the Smallblog Documentation article.

Dialogflow Webhook, Golang and Protobuf

This is the comment issue for the Dialogflow Webhook, Golang and Protobuf article.

Gin Validation Errors Handling

This is the comment issue for the Gin Validation Errors Handling article.

DialogFlow : A complete guide with webhook

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Cheap Open-Source Stack

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Writing a markov-chain IRC bot in Go

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Smallblog Update & Capabilities

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CI/CD with Drone, Kubernetes and Helm - Part 2

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Cheap Open-Source Stack

This is the comment issue for the Cheap Open-Source Stack article.

How to do gin-validation for an array of struct

Hi @depado ,
Greetings, I saw your blog for gin-validation and it helped in my use case.
But I am unable to use it if the validation is done on an array of struct.

My sample code

package main

import (
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"reflect"
	"strings"

	"github.com/gin-gonic/gin"
	"github.com/gin-gonic/gin/binding"
	"github.com/go-playground/validator/v10"
)

type User struct {
	Email string `json:"email" form:"e-mail" binding:"required"`
	Name  string `json:"name" binding:"required"`
}

func main() {
	route := gin.Default()
	if v, ok := binding.Validator.Engine().(*validator.Validate); ok {
		v.RegisterTagNameFunc(func(fld reflect.StructField) string {
			name := strings.SplitN(fld.Tag.Get("json"), ",", 2)[0]
			if name == "-" {
				return ""
			}
			return name
		})
	}
	route.POST("/user", validateUser)
	route.Run(":8085")
}
func validateUser(c *gin.Context) {
	var u []User
	if err := c.ShouldBindJSON(&u); err == nil {
		c.JSON(http.StatusOK, gin.H{"message": "User validation successful."})
	} else {
		fmt.Println(err)
		var verr validator.ValidationErrors
		var jsErr *json.UnmarshalTypeError

		if errors.As(err, &verr) {
			c.JSON(http.StatusBadRequest, gin.H{"errors": Descriptive(verr)})
			return
		} else if errors.As(err, &jsErr) {
			c.JSON(http.StatusBadRequest, gin.H{"errors": MarshalErr(*jsErr)})
			return
		}
	}
}

func Simple(verr validator.ValidationErrors) map[string]string {
	errs := make(map[string]string)
	for _, f := range verr {
		err := f.ActualTag()

		if f.Param() != "" {
			err = fmt.Sprintf("%s=%s", err, f.Param())
		}
		errs[f.Field()] = err + "," + f.Kind().String()
		fmt.Println(errs)
	}
	return errs

}

type ValidationError struct {
	Field  string `json:"field"`
	Type   string `json:"type"`
	Reason string `json:"reason"`
}
func MarshalErr(jsErr json.UnmarshalTypeError) ValidationError {
	errs := ValidationError{}
	errs.Field=jsErr.Field
	errs.Reason="invalid type"
	errs.Type=jsErr.Type.String()
	return errs
}
func Descriptive(verr validator.ValidationErrors) []ValidationError {
	errs := []ValidationError{}

	for _, f := range verr {
		fmt.Println(f)
		err := f.ActualTag()
		if f.Param() != "" {
			err = fmt.Sprintf("%s=%s", err, f.Param())
		}
		errs = append(errs, ValidationError{Field: f.Field(), Reason: err, Type: f.Type().Name()})
	}

	return errs
}

Test Input

curl --location --request POST 'http://localhost:8085/user' \
--header 'content-type: application/json' \
--data-raw '[
    {
        "email": "[email protected]",
        "name": "Me"
    },
    {
        "email": "[email protected]"
    }
]'

Expected output

"errors": [
        {
            "field": "name",
            "type": "string",
            "reason": "required"
        }
    ]

Can you please help me with it.

Mistune Syntax Highlighter, MathJax support and centered images

This is the comment issue for the Mistune Syntax Highlighter, MathJax support and centered images article.

Execute a function periodically using a wrapper in Python

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Checklist for Go projects

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Rendering the TOC with Blackfriday

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Some Go snippets I find useful

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Small and secure Docker images for Go

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Play a distant audio stream using Go and Gstreamer

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Small Example : How to use the scrape library in Go

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