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appdynamics.go

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package hooks

import (

"encoding/json"

"errors"

"fmt"

"io"

"io/ioutil"

"os"

"path/filepath"

"sort"

"strings"

"github.com/cloudfoundry/libbuildpack"

"regexp"

)

type Command interface {

Execute(string, io.Writer, io.Writer, string, ...string) error

}

type AppdynamicsHook struct {

libbuildpack.DefaultHook

Log *libbuildpack.Logger

Command Command

}

type Plan struct {

Credentials Credential `json:"credentials"`

}

type Credential struct {

ControllerHost string `json:"host-name"`

ControllerPort string `json:"port"`

SslEnabled bool `json:"ssl-enabled"`

AccountAccessKey string `json:"account-access-key"`

AccountName string `json:"account-name"`

}

type VcapApplication struct {

ApplicationName string `json:"application_name"`

ApplicationId string `json:"application_id"`

}

func (h AppdynamicsHook) getEnv(key, fallback string) string {

if value, ok := os.LookupEnv(key); ok {

return value

}

return fallback

}

func (h AppdynamicsHook) GenerateAppdynamicsScript(envVars map[string]string) string {

var envKeys []string

for k := range envVars {

envKeys = append(envKeys, k)

}

sort.Strings(envKeys) // unnecessary but just to be deterministic for tests

scriptContents := "# Autogenerated Appdynamics Script\n"

for _, envKey := range envKeys {

envStr := fmt.Sprintf("export %s=%s", envKey, envVars[envKey])

scriptContents += "\n" + envStr

}

return scriptContents

}

func (h AppdynamicsHook) GenerateStartUpCommand(startCommand string) (string, error) {

webCommands := strings.SplitN(startCommand, ":", 2)

if len(webCommands) != 2 {

return "", errors.New("improper format found in Procfile")

}

return fmt.Sprintf("web: pyagent run -- %s", webCommands[1]), nil

}

func (h AppdynamicsHook) RewriteProcFile(procFilePath string) error {

startCommand, err := ioutil.ReadFile(procFilePath)

if err != nil {

return fmt.Errorf("Error reading file %s: %v", procFilePath, err)

}

newCommand, err := h.GenerateStartUpCommand(string(startCommand))

if err != nil {

return err

}

if err := ioutil.WriteFile(procFilePath, []byte(newCommand), 0666); err != nil {

return fmt.Errorf("Error writing file %s: %v", procFilePath, err)

}

return nil

}

func (h AppdynamicsHook) RewriteRequirementsFile(stager *libbuildpack.Stager) error {

h.Log.BeginStep("Rewriting Requirements file with appdynamics package")

reqFile := filepath.Join(stager.BuildDir(), "requirements.txt")

writeFlag := os.O_APPEND | os.O_WRONLY

packageName := "\n" + "appdynamics"

if exists, err := libbuildpack.FileExists(reqFile); err != nil {

return err

} else if !exists {

h.Log.Info("Requirements file not found creating one with appdynamics packages")

writeFlag = os.O_CREATE | os.O_WRONLY

packageName = "appdynamics"

}

f, err := os.OpenFile(reqFile, writeFlag, 0666)

if err != nil {

panic(err)

}

defer f.Close()

if _, err = f.WriteString(packageName); err != nil {

panic(err)

}

fileContents, _ := ioutil.ReadFile(f.Name())

h.Log.Info(string(fileContents))

return nil

}

func (h AppdynamicsHook) RewriteProcFileWithAppdynamics(stager *libbuildpack.Stager) error {

h.Log.BeginStep("Rewriting ProcFile to start with Appdynamics")

file := filepath.Join(stager.BuildDir(), "Procfile")

if exists, _ := libbuildpack.FileExists(file); exists {

if err := h.RewriteProcFile(file); err != nil {

return err

}

fileContents, _ := ioutil.ReadFile(file)

h.Log.Info(string(fileContents))

} else {

h.Log.Info("Cannot find Procfile, skipping this step!")

}

return nil

}

func (h AppdynamicsHook) CreateAppDynamicsEnv(stager *libbuildpack.Stager, environmentVars map[string]string) error {

scriptContents := h.GenerateAppdynamicsScript(environmentVars)

h.Log.BeginStep("Writing Appdynamics Environment")

h.Log.Debug(scriptContents)

return stager.WriteProfileD("appdynamics.sh", scriptContents)

}

func (h AppdynamicsHook) BeforeCompile(stager *libbuildpack.Stager) error {

if os.Getenv("APPD_AGENT") != "" {

// APPD_AGENT is set => multibuildpack is used to configure appdynamics agent. Do nothing.

return nil

}

// Some env var or something that lets us know that we are using app dynamics?

vcapServices := os.Getenv("VCAP_SERVICES")

services := make(map[string][]Plan)

err := json.Unmarshal([]byte(vcapServices), &services)

if err != nil {

h.Log.Debug("Could not unmarshall VCAP_SERVICES JSON exiting")

return nil

}

var appdServiceName string

for serviceName := range services {

if match, err := regexp.MatchString("app(-)?dynamics", serviceName); err != nil {

return nil

} else if match {

appdServiceName = serviceName

h.Log.Warning("[DEPRECATION WARNING]:")

h.Log.Warning("Please use AppDynamics extension buildpack for Python Application instrumentation")

h.Log.Warning("for more details: https://docs.pivotal.io/partners/appdynamics/multibuildpack.html")

break

}

}

if appdServiceName == "" {

return nil

}

h.Log.BeginStep("Setting up Appdynamics")

val := services[appdServiceName]

appdynamicsPlan := val[0].Credentials

vcapApplication := os.Getenv("VCAP_APPLICATION")

application := VcapApplication{}

err = json.Unmarshal([]byte(vcapApplication), &application)

if err != nil {

h.Log.Debug("Could not unmarshall VCAP_APPLICATION JSON")

}

sslFlag := "off"

if appdynamicsPlan.SslEnabled {

sslFlag = "on"

}

appdEnv := map[string]string{

"APPD_APP_NAME": h.getEnv("APPD_APP_NAME", application.ApplicationName),

"APPD_TIER_NAME": h.getEnv("APPD_TIER_NAME", application.ApplicationName),

"APPD_NODE_NAME": h.getEnv("APPD_NODE_NAME", application.ApplicationName),

"APPD_CONTROLLER_HOST": appdynamicsPlan.ControllerHost,

"APPD_CONTROLLER_PORT": appdynamicsPlan.ControllerPort,

"APPD_ACCOUNT_ACCESS_KEY": appdynamicsPlan.AccountAccessKey,

"APPD_ACCOUNT_NAME": appdynamicsPlan.AccountName,

"APPD_SSL_ENABLED": sslFlag,

}

if err := h.RewriteRequirementsFile(stager); err != nil {

h.Log.Error("Could not write requirements file with Appdynamics packages: %v", err)

return err

}

if err := h.CreateAppDynamicsEnv(stager, appdEnv); err != nil {

h.Log.Error("Could not create Appdynamics environment: %v", err)

return err

}

if err := h.RewriteProcFileWithAppdynamics(stager); err != nil {

h.Log.Error("Could not rewrite procfile with Appdynamics start command: %v", err)

return err

}

return nil

}

func init() {

logger := libbuildpack.NewLogger(os.Stdout)

command := &libbuildpack.Command{}

libbuildpack.AddHook(AppdynamicsHook{

Log: logger,

Command: command,

})

}