I'm trying to build a Go package with the build flag -buildmode=c-shared. I'm expecting to get two files myfile.so and myfile.h. However, I'm only getting the .so file. Why is this and how can I fix it?
The full command I am running is:
go build -o myfile.so -buildmode=c-shared myfile.go
I found my "instructions" here as I am planning on calling myfile from Python.
This is my Go code:
package main
import (
"C"
"bytes"
"log"
"encoding/json"
"net/http"
)
func call_request(arg1, arg2, arg3 string) {
// simple golang code to submit a http post request
}
func main () {
}
This is a basic summary of my code, without posting my whole code. However, it may be useful to note that running the example in the link above created a .so and .h file.
As #JimB said, the issue was there was not a header file:
Updated code:
package main
import (
"C"
"bytes"
"log"
"encoding/json"
"net/http"
)
//export call_request
func call_request(arg1, arg2, arg3 string) {
// simple golang code to submit a http post request
}
func main () {
}
Related
This is newbie question. The dependencies seems to be on github, and it's pretty obvious from the import, so why run doesn't work?
Error is: no required module provides package github.com/hashicorp/go-getter
package main
import (
"context"
"fmt"
"os"
// Problem with line below, getting error: no required module provides package
getter "github.com/hashicorp/go-getter"
)
func main() {
client := &getter.Client{
Ctx: context.Background(),
//define the destination to where the directory will be stored. This will create the directory if it doesnt exist
Dst: "/tmp/gogetter",
Dir: true,
//the repository with a subdirectory I would like to clone only
Src: "github.com/hashicorp/terraform/examples/cross-provider",
Mode: getter.ClientModeDir,
//define the type of detectors go getter should use, in this case only github is needed
Detectors: []getter.Detector{
&getter.GitHubDetector{},
},
//provide the getter needed to download the files
Getters: map[string]getter.Getter{
"git": &getter.GitGetter{},
},
}
//download the files
if err := client.Get(); err != nil {
fmt.Fprintf(os.Stderr, "Error getting path %s: %v", client.Src, err)
os.Exit(1)
}
//now you should check your temp directory for the files to see if they exist
}
Create a folder somewhere called getter, then create a file
getter/getter.go:
package main
import (
"fmt"
"github.com/hashicorp/go-getter/v2"
)
func main() {
fmt.Println(getter.ErrUnauthorized)
}
Notice I didn't use a name like you specified, as it's redundant in this case. The package is already called getter [1], so you don't need to specify the same name. Then, run:
go mod init getter
go mod tidy
go build
https://pkg.go.dev/github.com/hashicorp/go-getter/v2
I am trying to build a web app with two files.
app.go and main.go are both in the same directory.
app.go
package main
import (
"database/sql"
_ "github.com/go-sql-driver/mysql"
"github.com/gorilla/mux"
)
type App struct {
Router *mux.Router
DB *sql.DB
}
func (a *App) Initialize(username, password, server, port, dbName, cacheAddr, cachePass string){
}
func (a *App) Run(addr string) {
}
main.go
package main
func main() {
a := App{}
// more code here
}
I thought my main.go file would recognize App{} but my editor is complaining that App is undeclared name
Both files are in the same main package but I am not sure what went wrong. Could anyone help me about it? Thank you!
From the comments I assume you run the following command: go run main.go. This will ONLY load code in main.go (and files included with import statements). To tell Go to load all .go files in the current directory, run the following instead:
go run .
Similarly, to tell VSCode to load alll files start it like this:
code .
I am processing a GET request in Go using fasthttp.
The query parameter test in this request is .%2A%2Ftoday%2F.%2A.
I am using POSTMAN to create the request, and the URL generated is:
http://localhost:3000/apiname/?test=.%252A%252Ftoday%252F.%252A
ctx.QueryArgs().Peek("test") gives me .*/today/.* instead of the original .%2A%2Ftoday%2F.%2A
I know I cannot partially encode/decode the request URL. Is there any way to get the original param as is?
Are you sure? I've just tested it and I'm getting the result you want.
This is the minimal working example:
package main
import (
"fmt"
"log"
"github.com/fasthttp/router"
"github.com/valyala/fasthttp"
)
func Test(ctx *fasthttp.RequestCtx) {
ctx.Response.SetBodyString(string(ctx.QueryArgs().Peek("test")))
fmt.Println(string(ctx.QueryArgs().Peek("test")))
}
func main() {
r := router.New()
r.GET("/test", Test)
log.Fatal(fasthttp.ListenAndServe("127.0.0.1:8080", r.Handler))
}
This is the command line output after the GET request:
$ go run main.go
.%2A%2Ftoday%2F.%2A
and this is the response in Postman:
I have go lang code to read some json file. It's running fine in local but I created Lambda package and uploaded the package in Lambda. It cannot read the file
import (
"context"
"fmt"
"io/ioutil"
"github.com/aws/aws-lambda-go/lambda"
)
type MyEvent struct {
Name string `json:"name"`
}
func HandleRequest(ctx context.Context, name MyEvent) (string, error) {
jsonBytes, err := ioutil.ReadFile("mappings.json")
fmt.Println(string(jsonBytes))
fmt.Println(err)
return fmt.Sprintf("Hello %s!", name.Name), nil
}
func main() {
lambda.Start(HandleRequest)
}
How to read the file from AWS Lambda? Any idea on this?
I have used your sample code and put in the zip file and also the mappings file that I used to test on AWS lambda. Link to code - https://github.com/nihanthd/stackoverflow/tree/master/lambda
Handler name in AWS lambda is trial
Test Data to trigger the function using AWS lambda event
{
"name": "Vignesh"
}
Commands used to build the executable and create the zip file
$ GOARCH=amd64 GOOS=linux go build trial.go
$ zip trial.zip trial mappings.json
I saw the similar question here. But I couldn't solve my case.
I am having project initialised with dep and added the first dependency "Echo". Now folder structure looks like this
|--server
| |--server.go
|--vendor
|--main.go
The server.go has the following code
package server
import (
"net/http"
"github.com/labstack/echo"
)
// TestController : Test controller
func TestController(c echo.Context) error {
return c.String(http.StatusOK, "Hello, World!")
}
and the main.go has
package main
import (
"github.com/labstack/echo"
"github.com/sfkshan/pos/server"
)
func main() {
e := echo.New()
e.GET("/", server.TestController)
e.Logger.Fatal(e.Start(":1323"))
}
Now vscode shows the warning
cannot use server.TestController (type
func("github.com/sfkshan/pos/vendor/github.com/labstack/echo".Context)
error) as type "github.com/labstack/echo".HandlerFunc in argument to
e.GET
I am not sure why is this happening? If I delete the vendor folder folder the error vanishes. But again after running dep ensure (in this case vendor folder gets created which is expected) the error appears again.