Unit: Golang Hello world example can not work

[lth2015]

When I use the nginx/unit project as my LoadBalancer component, I want use golang programming language to make a plugin tool. According to the official document, I config/make unit source code and go build my program, then use http put command to update the config:

{
    "listeners": {
        "*:8500": {
            "application": "go_chat_app"
        }
    },

    "applications": {
        "go_chat_app": {
            "type": "go",
            "working_directory": "/tmp",
            "executable": "/tmp/unit-go"
        }
    }
}

```bash

curl -X PUT -d @go.json --unix-socket /var/run/control.unit.sock http://localhost/

After start unit service, I can't see the unit-go child process in `ps` commond, but I see the 8500 port is listing by unit router process:

```bash
#netstat -anpt | grep 8500
tcp        0      0 0.0.0.0:8500            0.0.0.0:*               LISTEN      12798/unit: router

```bash

ps auxf

root 12795 0.0 0.0 16224 952 ? Ss 5月25 0:00 unit: main [/usr/sbin/unitd --log /var/log/unitd.log --pid /run/unitd.pid]
nobody 12797 0.0 0.0 26468 976 ? S 5月25 0:00 _ unit: controller
nobody 12798 0.0 0.0 174076 932 ? Sl 5月25 0:00 _ unit: router

and my golang code:
```golang
package main

import (
    "fmt"
    "net/http"
    "nginx/unit"
)

func handler(w http.ResponseWriter, r *http.Request) {
    w.Header().Add("Content-Type", "text/plain");

    fmt.Fprintf(w, "Method : %s\n", r.Method)
    fmt.Fprintf(w, "URL    : %s\n", r.URL.Path)
    fmt.Fprintf(w, "Host   : %s\n", r.Host)
}

func main() {
    http.HandleFunc("/", handler)
    unit.ListenAndServe("8000", nil)
}

go.json:

{
    "listeners": {
        "*:8500": {
            "application": "go_chat_app"
        }
    },

    "applications": {
        "go_chat_app": {
            "type": "go",
            "working_directory": "/tmp",
            "executable": "/tmp/unit-go"
        }
    }
}

Anybody has same problem?

[lth2015]

When I curl localhost:8500, it returns "Read header timeout" error.

[mar0x]

Please provide more information about your environment: OS version, golang version, configure command line options to reproduce the issue.

[lth2015]

Thank you very much~
Here is my environment Info:
OS version: CentOS 7
Kernel version: 3.10.0-693.2.2.el7.x86_64
Golang version: go1.9.5 linux/amd64

Configure commands:
Firstly: ./config
Then: ./config go
Then: make all
Finally: make go-install

My directory:
~/unit
├── full.json
├── get.sh
├── go.json
├── put.sh
├── src
│   ├── nginx
│   │   └── unit
│   └── unit
│   ├── auto
│   ├── build
│   ├── CHANGES
│   ├── configure
│   ├── docs
│   ├── LICENSE
│   ├── Makefile
│   ├── NOTICE
│   ├── pkg
│   ├── README
│   ├── sbin
│   ├── src
│   └── test
├── unit
└── unit.go

GOPATH: ~/unit

[lth2015]

This problem is also posted on stackoverflow-Can not find unit-go child process in nginx unit, curl request timeout, welcoming everyone to join the discussion~

[mar0x]

I've tried to reproduce your issue and failed with it. Sorry.
Let's ensure we using same version, same commands etc. This is my sequence of commands:

$ cd $HOME
$ script $HOME/unit-i126.log
$ rm -rf $HOME/unit-i126 && mkdir -p $HOME/unit-i126/src
$ cd $HOME/unit-i126/src
$ git clone https://github.com/nginx/unit.git
$ cp unit/pkg/rpm/rpmbuild/SOURCES/unit.example-go-app ../go-app.go
$ cp unit/pkg/rpm/rpmbuild/SOURCES/unit.example-go-config ../go-app.json
$ cd unit
$ export GOPATH=$HOME/unit-i126
$ ./configure
$ ./configure go
$ make -s all
$ make go-install
$ ./build/unitd
$ cd $HOME/unit-i126
$ go build go-app.go
$ cp go-app /tmp/
$ curl -X PUT -d @go-app.json --unix-socket src/unit/control.unit.sock http://localhost/
$ curl http://localhost:8500/
$ kill `cat src/unit/unit.pid`
$ exit

Please stop any running version of unit and carefully execute this commands line by line. In case of any issues, let me know and attach $HOME/unit-i126.log and $HOME/unit-i126/src/unit/unit.log files.

[VBart]

@lth2015 What Unit version are you trying to run? Please, note that currently supported version is 1.1 and all the instructions are valid for it.

[lth2015]

@mar0x thank you very much! It's works! may be I use a different version of unit by yum install unit and service unitd start.
@VBart thank you~

I will write a document to show how to can run unit-go step-by-step, thank you all guys~