Me and a few friends are writing a server using golang (revel) and had a database implemented just a few weeks ago. Then suddenly everything just stopped working and the go compiler can't find my import files. That includes EmptyPlugin as well as RegisterPlugin.
We are all pretty new so this is probably a pretty simple fix. I have checked my github.com/robfig/revel folder, and there is no file called EmptyPlugin. But that is probably a misunderstanding from my side :P.
By commenting the lines revel.EmptyPlugin and revel.RegisterPlugin(DbPlugin{}) everything works as it should.
package controllers
import (
"database/sql"
"fmt"
_ "github.com/bmizerany/pq"
"github.com/robfig/revel"
"log"
"time"
//"strconv"
)
type DbPlugin struct {
revel.EmptyPlugin
}
func init() {
revel.RegisterPlugin(DbPlugin{})
}
var db *sql.DB
var err error
You appear to compiling using the latest and recently updated version of Revel: https://github.com/robfig/revel.
However, it appears that your code was written for this older version of Revel: https://github.com/robfig/revel/tree/dev.
Update your code to the latest version of Revel.
Related
package common
import (
"github.com/dgrijalva/jwt-go"
)
type Claims struct {
UserId uint
jwt.StandardClaims
}
Above is my code. Today, after using the gin and gorm framework normally, I created a new jwt.go file in the common package. When I run the main function, golang prompts an error (undefined: jwt) in the last line, but in the go.mod file, I am prompted that I have downloaded "github. com/dgrijalva/jwt-go".
I tried to get github.com/dgrijalva/jwt-go and import go get - u github.com/golang-jwt/jwt again, but neither of the two methods worked
How can I serve swagger-ui-dist in Cloud Function with Go?
Out of Cloud Functions environment I would do:
package main
import (
"fmt"
"net/http"
)
func main() {
fs := http.FileServer(http.Dir("./swagger-ui-dist"))
http.Handle("/swaggerui/", http.StripPrefix("/swaggerui/", fs))
http.ListenAndServe(":8080", nil)
}
But since Cloud functions use a normal function as handler using the Standard http.HanlderFunc interface I don't know how to make it work.
I have tried to simulate this scenario to do my tests with http.ServeFile, but didn't work. Seems like is not downloading all the contents of the folder.
package main
import (
"fmt"
"net/http"
)
func cloudFunctionHandler(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, "./swagger-ui-dist")
}
func main() {
http.HanldeFunc("/swaggerui/", handler)
http.ListenAndServe(":8080", nil)
}
I tried it in several way and it worked locally with the same behavior as Cloud Function (same function signature), but it didn't work after deployment on Cloud Functions.
I understood why. In fact Buildpack (the tools develped by Google for building a container without a Dockerfile, and now in the CNCF sandbox) compiles the .go file and copy the binary to the final container layer. All the other files/directory are omitted. Thus, it can't work!
I recommend you to use Cloud Run (same underlying platform as Cloud Functions, and in some cases, cheaper. I wrote an article on this)
The other solution is to use a not compiled language such as NodeJS or Python.
It is actually possible in three ways (that I know):
Serve the static files from a CDN. E.g. from http://cdnjs.cloudflare.com/ajax/libs/swagger-ui/3.40.0/
Host the static files yourself on a different endpoint
Add the static files to the root folder of your cloud function. These will be packaged together with your code and therefore be available when deployed
(I went for option 3)
For options 2 and 3 you have to override the folder that swaggerui uses for its static assets. How you do this depends on how you configure the swagger ui.
In my case I was using the flask_restx Python package to generate the swagger.json and serve the swaggerui. So I monkeypatched like so:
from flask_restx.apidoc import apidoc
apidoc.static_folder = '<MY STATIC FOLDER PATH' # e.g. os.path.abspath('static/swaggerui')
Also, you need to copy the files from the swaggerui library to your function's root directory before running gcloud function deploy ....
I copy the static folder from flask_restx to my function's root directory during my CI pipeline.
Hope this helps anyone!
I am fairly new to the Go programming language and completely new to the Go SDK from AWS. I am trying to use a service but I have a strange problem where the types defined by the imported service are found, but the functions of the service are undefined.
This question is not about using the particular service, but just how to correctly import it. My code:
package auth
import (
"log"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/cognitoidentityprovider"
)
func SignUpTest() {
input := cognitoidentityprovider.SignUpInput{
Username: aws.String("example#mail.com"),
Password: aws.String("test1234"),
}
_, err := cognitoidentityprovider.SignUp(&input)
if err != nil {
log.Fatal(err)
}
}
I get the following error when running go build:
auth/signup.go:18:12: undefined: cognitoidentityprovider.SignUp
The autocomplete in my IDE also states that it can find the cognitoidentityprovider.SingUpInput struct, but it is unable to find the cognitoidentityprovider.SignUp function.
I use Go 1.10.1 on WSL Ubuntu. I use DEP 0.4.1 for package management. I verified that the AWS SDK is available in the vendor folder and that the cognitoidentityprovider package is available (the SignUp) function is also there.
What am I missing here?
The error says it all. cognitoidentityprovider.SignUp isn't defined, because there is no symbol SignUp exported by the cognitoidentityprovider package.
I'm not really sure what you want to do instead, since I'm not familiar with that SDK, but you're trying to call a function that doesn't exist. I suggest re-examining the documentation or example you're following. You've probably made a simple mistake.
You seem to be confused by the CognitoIdentityProvider.SignUp instance method. But as that's an instance method, and not an exported function, it requires an instance of a CognitoIdentityProvider first:
cip := cognitoidentityprovider.New( ... )
_, err := cip.SignUp(input)
How can i access the device system in gomobile?
Is there a way to interact with the native libs?
Like this:
package xy
import(
"Foundation"// ios libraray
)
// Do some stuff with the Foundation package
func Test(){
}
Yes. Take a look at Reverse Bindings here; https://godoc.org/golang.org/x/mobile/cmd/gobind
To summarise, you import the Android/ObjectiveC library and are good to go.
The example they give;
import "ObjC/Foundation/NSDate
d := NSDate.Date()
I followed creating a basic web app with go, I created the folder with name myApp. In myApp have main.go and public folder(in public have index.html), here is my content in main.go:
package main
import "net/http"
import "github.com/russross/blackfriday"
func main() {
http.HandleFunc("/markdown", GenerateMarkdown)
http.Handle("/", http.FileServer(http.Dir("public")))
http.ListenAndServe(":8080", nil)
}
func GenerateMarkdown(rw http.ResponseWriter, r *http.Request) {
markdown := blackfriday.MarkdownCommon([]byte(r.FormValue("body")))
rw.Write(markdown)
}
I started server and go to http://localhost:8080/ but it doesn't link to index.html. Can anyone explain why it doesn't render index.html file. I'm a newbie in Golang.
This was answered in the comments, so here is a summary for completeness or something.
The code presented in the question produced the expected results after the actual build->run->test->repeat process was clarified for OP. Points of clarification were as follows:
After using go build to compile the binary, the program isn't running yet. Be sure to actually execute the binary before trying to connect to the server.
If it's necessary to make changes, stop the server, run go build again, then run the new binary.
As a side note, gin is a tool that tries to automate this process by rebuilding and launching your program each time you save the file.