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manager.go
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manager.go
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package manager
import (
"bytes"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"log"
"net/http"
"os"
"path"
"sync"
"github.com/OpenFogStack/tinyFaaS/pkg/util"
"github.com/google/uuid"
)
const (
TmpDir = "./tmp"
)
type ManagementService struct {
id string
backend Backend
functionHandlers map[string]Handler
functionHandlersMutex sync.Mutex
rproxyListenAddress string
rproxyPort map[string]int
rproxyConfigPort int
}
type Backend interface {
Create(name string, env string, threads int, filedir string) (Handler, error)
Stop() error
}
type Handler interface {
IPs() []string
Start() error
Destroy() error
Logs() (string, error)
}
func New(id string, rproxyListenAddress string, rproxyPort map[string]int, rproxyConfigPort int, tfBackend Backend) *ManagementService {
ms := &ManagementService{
id: id,
backend: tfBackend,
functionHandlers: make(map[string]Handler),
rproxyListenAddress: rproxyListenAddress,
rproxyPort: rproxyPort,
rproxyConfigPort: rproxyConfigPort,
}
return ms
}
func (ms *ManagementService) createFunction(name string, env string, threads int, funczip []byte, subfolderPath string) (string, error) {
// only allow alphanumeric characters
if !util.IsAlphaNumeric(name) {
return "", fmt.Errorf("function name %s contains non-alphanumeric characters", name)
}
// make a uuidv4 for the function
uuid, err := uuid.NewRandom()
if err != nil {
return "", err
}
log.Println("creating function", name, "with uuid", uuid.String())
// create a new function handler
p := path.Join(TmpDir, uuid.String())
err = os.MkdirAll(p, 0777)
if err != nil {
return "", err
}
log.Println("created folder", p)
// write zip to file
zipPath := path.Join(TmpDir, uuid.String()+".zip")
err = os.WriteFile(zipPath, funczip, 0777)
if err != nil {
return "", err
}
err = util.Unzip(zipPath, p)
if err != nil {
return "", err
}
defer func() {
// remove folder
err = os.RemoveAll(p)
if err != nil {
log.Println("error removing folder", p, err)
}
err = os.Remove(zipPath)
if err != nil {
log.Println("error removing zip", zipPath, err)
}
log.Println("removed folder", p)
log.Println("removed zip", zipPath)
}()
if subfolderPath != "" {
p = path.Join(p, subfolderPath)
}
// we know this function already, destroy its current handler
if _, ok := ms.functionHandlers[name]; ok {
err = ms.functionHandlers[name].Destroy()
if err != nil {
return "", err
}
}
// create new function handler
ms.functionHandlersMutex.Lock()
defer ms.functionHandlersMutex.Unlock()
fh, err := ms.backend.Create(name, env, threads, p)
if err != nil {
return "", err
}
ms.functionHandlers[name] = fh
err = ms.functionHandlers[name].Start()
if err != nil {
return "", err
}
// tell rproxy about the new function
// curl -X POST http://localhost:80/add -d '{"name": "<name>", "ips": ["<ip1>", "<ip2>"]}'
d := struct {
FunctionName string `json:"name"`
FunctionIPs []string `json:"ips"`
}{
FunctionName: name,
FunctionIPs: fh.IPs(),
}
b, err := json.Marshal(d)
if err != nil {
return "", err
}
log.Println("telling rproxy about new function", name, "with ips", fh.IPs(), ":", d)
resp, err := http.Post(fmt.Sprintf("http://%s:%d", ms.rproxyListenAddress, ms.rproxyConfigPort), "application/json", bytes.NewBuffer(b))
if err != nil && !errors.Is(err, io.EOF) {
log.Println("error telling rproxy about new function", name, err)
return "", err
}
if resp.StatusCode != http.StatusOK {
return "", fmt.Errorf("rproxy returned status code %d", resp.StatusCode)
}
defer resp.Body.Close()
r, err := io.ReadAll(resp.Body)
if err != nil {
return "", err
}
log.Println("rproxy response:", string(r))
return name, nil
}
func (ms *ManagementService) Logs() (string, error) {
var logs string
for name := range ms.functionHandlers {
l, err := ms.LogsFunction(name)
if err != nil {
return "", err
}
logs += l
logs += "\n"
}
return logs, nil
}
func (ms *ManagementService) LogsFunction(name string) (string, error) {
fh, ok := ms.functionHandlers[name]
if !ok {
return "", fmt.Errorf("function %s not found", name)
}
return fh.Logs()
}
func (ms *ManagementService) List() []string {
list := make([]string, 0, len(ms.functionHandlers))
for name := range ms.functionHandlers {
list = append(list, name)
}
return list
}
func (ms *ManagementService) Wipe() error {
for name := range ms.functionHandlers {
log.Println("destroying function", name)
ms.Delete(name)
}
return nil
}
func (ms *ManagementService) Delete(name string) error {
fh, ok := ms.functionHandlers[name]
if !ok {
return fmt.Errorf("function %s not found", name)
}
log.Println("destroying function", name)
ms.functionHandlersMutex.Lock()
defer ms.functionHandlersMutex.Unlock()
err := fh.Destroy()
if err != nil {
return err
}
// tell rproxy about the delete function
// curl -X POST http://localhost:80 -d '{"name": "<name>"}'
d := struct {
FunctionName string `json:"name"`
}{
FunctionName: name,
}
b, err := json.Marshal(d)
if err != nil {
return err
}
log.Println("telling rproxy about deleted function", name)
resp, err := http.Post(fmt.Sprintf("http://%s:%d", ms.rproxyListenAddress, ms.rproxyConfigPort), "application/json", bytes.NewBuffer(b))
if err != nil && !errors.Is(err, io.EOF) {
return err
}
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("rproxy returned status code %d", resp.StatusCode)
}
defer resp.Body.Close()
r, err := io.ReadAll(resp.Body)
if err != nil {
return err
}
log.Println("rproxy response:", string(r))
delete(ms.functionHandlers, name)
return nil
}
func (ms *ManagementService) Upload(name string, env string, threads int, zipped string) (string, error) {
// b64 decode zip
zip, err := base64.StdEncoding.DecodeString(zipped)
if err != nil {
// w.WriteHeader(http.StatusBadRequest)
log.Println(err)
return "", err
}
// create function handler
n, err := ms.createFunction(name, env, threads, zip, "")
if err != nil {
// w.WriteHeader(http.StatusInternalServerError)
log.Println(err)
return "", err
}
// return success
// w.WriteHeader(http.StatusOK)
r := ""
for prot, port := range ms.rproxyPort {
r += fmt.Sprintf("%s://%s:%d/%s\n", prot, ms.rproxyListenAddress, port, n)
}
return r, nil
}
func (ms *ManagementService) UrlUpload(name string, env string, threads int, funcurl string, subfolder string) (string, error) {
// download url
resp, err := http.Get(funcurl)
if err != nil {
// w.WriteHeader(http.StatusBadRequest)
log.Println(err)
return "", err
}
// reading body to memory
// not the smartest thing
zip, err := io.ReadAll(resp.Body)
if err != nil {
// w.WriteHeader(http.StatusBadRequest)
log.Println(err)
return "", err
}
// create function handler
n, err := ms.createFunction(name, env, threads, zip, subfolder)
if err != nil {
// w.WriteHeader(http.StatusInternalServerError)
log.Println(err)
return "", err
}
// return success
// w.WriteHeader(http.StatusOK)
r := ""
for prot, port := range ms.rproxyPort {
r += fmt.Sprintf("%s://%s:%d/%s\n", prot, ms.rproxyListenAddress, port, n)
}
return r, nil
}
func (ms *ManagementService) Stop() error {
err := ms.Wipe()
if err != nil {
return err
}
return ms.backend.Stop()
}