Gin框架与《Web Development with Go》实践（五）

应用的处理函数

src/taskmanager2/controllers2

taskmanager-controller2.png

显示HTTP Errors的助手

src/taskmanager2/common2/utils.go

package common2

import (
    "encoding/json"
    "os"
    "log"

    "gopkg.in/gin-gonic/gin.v1"
    "net/http"
)

type (
    appError struct {
        Error string `json:"error"`
        Message string `json:"message"`
        HttpStatus int `json:"status"`
    }
    errorResource struct {
        Data appError `json:"data"`
    }
    ...
)

func DisplayAppError(c *gin.Context, handlerError error, message string, code int) {
    errObj := appError{
        Error:      handlerError.Error(),
        Message:    message,
        HttpStatus: code,
    }
    //log.Printf("AppError]: %s\n", handlerError)
    Error.Printf("AppError]: %s\n", handlerError)

    c.JSON(http.StatusFound, errorResource{Data: errObj})
}

...

为一个http请求的周期处理数据

src/taskmanager2/controllers2/context.go
注意：现在标准库中已有context包，日后此处再改进。

package controllers2

import (
    "gopkg.in/mgo.v2"
    "taskmanager2/common2"
)

type Context struct {
    MongoSession *mgo.Session
}

func (c *Context) Close() {
    c.MongoSession.Close()
}

func (c *Context) DbCollection(name string) *mgo.Collection {
    return c.MongoSession.DB(common2.AppConfig.Database).C(name)
}

func NewContext() *Context {
    session := common2.GetSession().Copy()
    context := &Context{
        MongoSession: session,
    }
    return context
}