firehol/netdata

// SPDX-License-Identifier: GPL-3.0-or-later

package varnish

import (
    "context"
    "fmt"
    "os/exec"
    "strconv"
    "time"

    "github.com/netdata/netdata/go/plugins/logger"
    "github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/dockerhost"
)

type varnishstatBinary interface {
    statistics() ([]byte, error)
}

func newVarnishstatExecBinary(binPath string, cfg Config, log *logger.Logger) varnishstatBinary {
    return &varnishstatExec{
        Logger:       log,
        binPath:      binPath,
        timeout:      cfg.Timeout.Duration(),
        instanceName: cfg.InstanceName,
    }
}

type varnishstatExec struct {
    *logger.Logger

    binPath      string
    timeout      time.Duration
    instanceName string
}

func (e *varnishstatExec) statistics() ([]byte, error) {
    ctx, cancel := context.WithTimeout(context.Background(), e.timeout)
    defer cancel()

    cmd := exec.CommandContext(ctx, e.binPath, "varnishstat-stats", "--instanceName", e.instanceName)
    e.Debugf("executing '%s'", cmd)

    bs, err := cmd.Output()
    if err != nil {
        return nil, fmt.Errorf("error on '%s': %v", cmd, err)
    }

    return bs, nil
}

func newVarnishstatDockerExecBinary(cfg Config, log *logger.Logger) varnishstatBinary {
    return &varnishstatDockerExec{
        Logger:       log,
        timeout:      cfg.Timeout.Duration(),
        instanceName: cfg.InstanceName,
        container:    cfg.DockerContainer,
    }
}

type varnishstatDockerExec struct {
    *logger.Logger

    timeout      time.Duration
    instanceName string
    container    string
}

func (e *varnishstatDockerExec) statistics() ([]byte, error) {
    ctx, cancel := context.WithTimeout(context.Background(), e.timeout)
    defer cancel()

    timeS := strconv.Itoa(max(int(e.timeout.Seconds()), 1))

    args := []string{"-1", "-t", timeS}
    if e.instanceName != "" {
        args = append(args, "-n", e.instanceName)
    }

    return dockerhost.Exec(ctx, e.container, "varnishstat", args...)
}