GoでZabbixを爆速にしたかった

package main

import (
    "C"
    "errors"
    "log"
    "strings"

    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/credentials"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/service/ec2"
    "github.com/joho/godotenv"
    g2z "gopkg.in/cavaliercoder/g2z.v3"
)

// main ... 共有ライブラリなので通常は実行されない
func main() {
    panic("THIS_SHOULD_NEVER_HAPPEN")
}

// env_load ... pathに存在する.envを読み込み環境変数にマッピング
func env_load(path string) {
    err := godotenv.Load(path)
    if err != nil {
        log.Fatalf("Error loading .env file in %v.\n", path)
    }
}

// init ... 共有ライブラリ読み込み時に実行される
func init() {
    env_load("/etc/zabbix/aws.env") // AWS_ACCESS_KEY_IDとAWS_SECRET_ACCESS_KEYの値を参照
    g2z.RegisterStringItem("go.echo", "Hello World", Echo)
    g2z.RegisterStringItem("go.ec2_name2id", "error", Ec2Name2Id)
}

// Echo ... 引数の値を全て連結して返す
func Echo(req *g2z.AgentRequest) (string, error) {
    return strings.Join(req.Params, " "), nil
}

// Ec2Name2Id ... EC2インスタンスのタグ名からインスタンスIDを取得
func Ec2Name2Id(req *g2z.AgentRequest) (string, error) {
    if len(req.Params) != 1 {
        return "", errors.New("can use only 1 argument(s).")
    }

    sess, err := session.NewSession(&aws.Config{
        Credentials: credentials.NewEnvCredentials(),
    })
    if err != nil {
        return "error", err
    }

    svc := ec2.New(
        sess,
        aws.NewConfig().
            WithRegion("ap-northeast-1").
                WithLogLevel(
                    aws.LogDebugWithRequestRetries |
                    aws.LogDebugWithRequestErrors  |
                    aws.LogDebugWithHTTPBody,
                ),
    )

    params := &ec2.DescribeInstancesInput{
        Filters: []*ec2.Filter{
            &ec2.Filter{
                Name: aws.String("tag:Name"),
                Values: []*string{
                    aws.String(req.Params[0]),
                },
            },
        },
    }

    res, err2 := svc.DescribeInstances(params)
    if err2 != nil {
        return "error", err2
    }

    for _, r := range res.Reservations {
        for _, i := range r.Instances {
            return *i.InstanceId, nil
        }
    }
    return "empty", nil
}

version: 0.2

phases:
  install:
    commands:
      - wget https://github.com/Masterminds/glide/releases/download/v0.13.1/glide-v0.13.1-linux-amd64.tar.gz
      - tar xvf glide-v0.13.1-linux-amd64.tar.gz
      - install -o root -g root -m 0755 linux-amd64/glide /usr/local/bin/glide
  pre_build:
    commands:
      - /usr/local/bin/glide install
  build:
    commands:
      - GOOS=linux GOARCH=amd64 go build -buildmode=c-shared -o mod_zabbix_go.so main.go

artifacts:
  files:
    - 'mod_zabbix_go.so'
  discard-paths: no

+ LoadModulePath=/var/lib/zabbixsrv/modules
+ LoadModule=mod_zabbix_go.so

systemctl restart zabbix-agent.service

$ zabbix_get -s localhost -k 'go.echo[hello, ntrv]'
hello ntrv # OK!!
$ zabbix_get -s localhost -k 'go.ec2_name2id[ntrv-test]'

zabbix_get [24960]: Timeout while executing operation # i-xxxxxxと返ってくることを期待していた...