/
lib.go
234 lines (207 loc) · 5.72 KB
/
lib.go
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package check_json_path
import (
"bytes"
"errors"
"fmt"
"time"
"github.com/Knetic/govaluate"
"github.com/appscode/go/flags"
"github.com/appscode/go/net/httpclient"
"github.com/appscode/searchlight/pkg/icinga"
"github.com/appscode/searchlight/plugins"
"github.com/spf13/cobra"
"gomodules.xyz/envconfig"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/util/jsonpath"
"kmodules.xyz/client-go/tools/clientcmd"
)
type plugin struct {
client corev1.SecretInterface
options options
}
var _ plugins.PluginInterface = &plugin{}
func newPlugin(client corev1.SecretInterface, opts options) *plugin {
return &plugin{client, opts}
}
func newPluginFromConfig(opts options) (*plugin, error) {
client, err := clientcmd.ClientFromContext(opts.kubeconfigPath, opts.contextName)
if err != nil {
return nil, err
}
return newPlugin(client.CoreV1().Secrets(opts.namespace), opts), nil
}
type options struct {
kubeconfigPath string
contextName string
// http url
url string
// auth secret information
secretName string
namespace string
// Check condition
warning string
critical string
// IcingaHost
host *icinga.IcingaHost
}
func (o *options) complete(cmd *cobra.Command) (err error) {
hostname, err := cmd.Flags().GetString(plugins.FlagHost)
if err != nil {
return err
}
o.host, err = icinga.ParseHost(hostname)
if err != nil {
return errors.New("invalid icinga host.name")
}
o.namespace = o.host.AlertNamespace
o.kubeconfigPath, err = cmd.Flags().GetString(plugins.FlagKubeConfig)
if err != nil {
return
}
o.contextName, err = cmd.Flags().GetString(plugins.FlagKubeConfigContext)
if err != nil {
return
}
return nil
}
func (o *options) validate() error {
if o.host.Type != icinga.TypeCluster {
return errors.New("invalid icinga host type")
}
return nil
}
type authInfo struct {
username string `envconfig:"USERNAME"`
password string `envconfig:"PASSWORD"`
token string `envconfig:"TOKEN"`
caCertData string `envconfig:"CA_CERT_DATA"`
clientCertData string `envconfig:"CLIENT_CERT_DATA"`
clientKeyData string `envconfig:"CLIENT_KEY_DATA"`
insecureSkipVerify bool `envconfig:"INSECURE_SKIP_VERIFY"`
}
func (p *plugin) getData() (interface{}, error) {
opts := p.options
var hc *httpclient.Client
hc = httpclient.Default().WithBaseURL(opts.url).WithTimeout(time.Second * 10)
if opts.secretName != "" {
secret, err := p.client.Get(opts.secretName, metav1.GetOptions{})
if err != nil {
return "", err
}
var au authInfo
err = envconfig.Load("", &au, func(key string) (string, bool) {
v, ok := secret.Data[key]
if !ok {
return "", false
}
return string(v), true
})
if err != nil {
return "", err
}
hc = hc.WithBasicAuth(au.username, au.password).WithBearerToken(au.token)
if au.caCertData != "" {
if au.clientCertData != "" && au.clientKeyData != "" {
hc = hc.WithTLSConfig([]byte(au.caCertData), []byte(au.clientCertData), []byte(au.clientKeyData))
} else {
hc = hc.WithTLSConfig([]byte(au.caCertData))
}
}
if au.insecureSkipVerify {
hc = hc.WithInsecureSkipVerify()
}
}
var respJson interface{}
resp, err := hc.Call("GET", "", nil, &respJson, true)
if err != nil {
return "", err
}
if resp.StatusCode != 200 {
return "", fmt.Errorf("invalid status_code %v", resp.StatusCode)
}
return respJson, nil
}
func (p *plugin) checkResult(response interface{}, query string) (bool, error) {
j := jsonpath.New("check")
if err := j.Parse(query); err != nil {
return false, err
}
buf := new(bytes.Buffer)
if err := j.Execute(buf, response); err != nil {
return false, err
}
expr, err := govaluate.NewEvaluableExpression(buf.String())
if err != nil {
fmt.Println(err)
return false, err
}
param := make(map[string]interface{})
for _, v := range expr.Vars() {
param[v] = v
}
res, err := expr.Evaluate(param)
if err != nil {
fmt.Println(err)
return false, err
}
v, ok := res.(bool)
return v && ok, nil
}
func (p *plugin) Check() (icinga.State, interface{}) {
opts := p.options
jsonInterface, err := p.getData()
if err != nil {
return icinga.Unknown, err
}
if opts.critical != "" {
isCritical, err := p.checkResult(jsonInterface, opts.critical)
if err != nil {
return icinga.Unknown, err
}
if isCritical {
return icinga.Critical, fmt.Sprintf("%v", opts.critical)
}
}
if opts.warning != "" {
isWarning, err := p.checkResult(jsonInterface, opts.warning)
if err != nil {
return icinga.Unknown, err
}
if isWarning {
return icinga.Warning, fmt.Sprintf("%v", opts.warning)
}
}
return icinga.OK, "response looks good"
}
const (
flagURL = "url"
)
func NewCmd() *cobra.Command {
var opts options
c := &cobra.Command{
Use: "check_json_path",
Short: "Check Json Object",
Run: func(cmd *cobra.Command, args []string) {
flags.EnsureRequiredFlags(cmd, plugins.FlagHost, flagURL)
flags.EnsureAlterableFlags(cmd, "warning", "critical")
if err := opts.complete(cmd); err != nil {
icinga.Output(icinga.Unknown, err)
}
if err := opts.validate(); err != nil {
icinga.Output(icinga.Unknown, err)
}
plugin, err := newPluginFromConfig(opts)
if err != nil {
icinga.Output(icinga.Unknown, err)
}
icinga.Output(plugin.Check())
},
}
c.Flags().StringP(plugins.FlagHost, "H", "", "Icinga host name")
c.Flags().StringVarP(&opts.url, flagURL, "u", "", "URL to get data")
c.Flags().StringVarP(&opts.secretName, "secretName", "s", "", `Kubernetes secret name`)
c.Flags().StringVarP(&opts.warning, "warning", "w", "", `Warning jsonpath query which returns [true/false]`)
c.Flags().StringVarP(&opts.critical, "critical", "c", "", `Critical jsonpath query which returns [true/false]`)
return c
}