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create.go
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create.go
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// Copyright 2016 Red Hat, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/fsnotify/fsnotify"
"github.com/muter3000/funktion/pkg/funktion"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
)
const (
flowExtension = ".flow.yml"
)
type createFunctionCmd struct {
createCmdCommon
name string
runtime string
source string
file string
watch bool
debug bool
apply bool
functionsOnly bool
envVars []string
configMaps map[string]*v1.ConfigMap
}
func init() {
RootCmd.AddCommand(newApplyCmd())
RootCmd.AddCommand(newCreateCmd())
}
func newApplyCmd() *cobra.Command {
p := &createFunctionCmd{
apply: true,
}
cmd := &cobra.Command{
Use: "apply -f FILENAME",
Short: "applies one or more resources from a file, directory or URL",
Long: `This command will apply (create or update) one or more resources from a file, directory or URL`,
Run: func(cmd *cobra.Command, args []string) {
p.cmd = cmd
err := createKubernetesClient(cmd, p.kubeConfigPath, &p.kubeclient, &p.namespace)
if err != nil {
handleError(err)
return
}
handleError(p.createFromFile())
},
}
cmd.AddCommand(newCreateFunctionCmd())
cmd.AddCommand(newCreateFlowCmd())
f := cmd.Flags()
p.setupCommonFlags(f)
return cmd
}
func newCreateCmd() *cobra.Command {
p := &createFunctionCmd{}
cmd := &cobra.Command{
Use: "create -f FILENAME",
Short: "creates one or more resources from the command line, a file, directory or URL",
Long: `This command will create one or more resources from the command one, a file, directory or URL`,
Run: func(cmd *cobra.Command, args []string) {
p.cmd = cmd
err := createKubernetesClient(cmd, p.kubeConfigPath, &p.kubeclient, &p.namespace)
if err != nil {
handleError(err)
return
}
handleError(p.createFromFile())
},
}
cmd.AddCommand(newCreateFunctionCmd())
cmd.AddCommand(newCreateFlowCmd())
f := cmd.Flags()
p.setupCommonFlags(f)
return cmd
}
func newCreateFunctionCmd() *cobra.Command {
p := &createFunctionCmd{}
cmd := &cobra.Command{
Use: "fn [flags]",
Short: "creates a new function",
Long: `This command will create a new function resource`,
Run: func(cmd *cobra.Command, args []string) {
p.cmd = cmd
err := createKubernetesClient(cmd, p.kubeConfigPath, &p.kubeclient, &p.namespace)
if err != nil {
handleError(err)
return
}
handleError(p.createFunctionFromCLI())
},
}
f := cmd.Flags()
f.StringVarP(&p.name, "name", "n", "", "the name of the function to create")
f.StringVarP(&p.source, "source", "s", "", "the source code of the function to create")
f.StringVarP(&p.runtime, "runtime", "r", "nodejs", "the runtime to use. e.g. 'nodejs'")
p.setupCommonFlags(f)
return cmd
}
func (p *createFunctionCmd) createFromFile() error {
file := p.file
var err error
if len(file) == 0 {
return fmt.Errorf("No file argument specified!")
}
var matches []string
if isExistingDir(file) {
files, err := ioutil.ReadDir(file)
if err != nil {
return err
}
matches = []string{}
for _, fi := range files {
if !fi.IsDir() {
matches = append(matches, filepath.Join(file, fi.Name()))
}
}
} else {
matches, err = filepath.Glob(file)
if err != nil {
return fmt.Errorf("Could not parse pattern %s due to %v", file, err)
} else if len(matches) == 0 {
fmt.Printf("No files exist matching the name: %s\n", file)
fmt.Println("Please specify a file name that exists or specify the directory containing functions")
return fmt.Errorf("No suitable source file: %s", file)
}
}
for _, file := range matches {
err = p.applyFile(file)
if err != nil {
return err
}
}
if err == nil && p.watch {
p.watchFiles()
}
return err
}
func (p *createFunctionCmd) setupCommonFlags(f *pflag.FlagSet) {
f.StringArrayVarP(&p.envVars, "env", "e", []string{}, "pass one or more environment variables using the form NAME=VALUE")
f.StringVar(&p.kubeConfigPath, "kubeconfig", "", "the directory to look for the kubernetes configuration")
f.StringVar(&p.namespace, "namespace", "", "the namespace to create the resource")
f.BoolVarP(&p.watch, "watch", "w", false, "whether to keep watching the files for changes to the function source code")
f.BoolVarP(&p.debug, "debug", "d", false, "enable debugging for the function?")
f.StringVarP(&p.file, "file", "f", "", "the file name that contains the source code for the function to create")
}
func (p *createFunctionCmd) createFunctionFromCLI() error {
p.functionsOnly = true
listOpts, err := funktion.CreateFunctionListOptions()
if err != nil {
return err
}
file := p.file
if len(file) > 0 {
return p.createFromFile()
} else {
kubeclient := p.kubeclient
cms := kubeclient.ConfigMaps(p.namespace)
resources, err := cms.List(*listOpts)
if err != nil {
return err
}
p.configMaps = map[string]*v1.ConfigMap{}
for _, resource := range resources.Items {
p.configMaps[resource.Name] = &resource
}
name := nameFromFile(file, p.name)
if len(name) == 0 {
name, err = p.generateName()
if err != nil {
return err
}
}
update := p.configMaps[name] != nil
cm, err := p.createFunction(name)
if err != nil {
return err
}
message := "created"
if update {
_, err = cms.Update(cm)
message = "updated"
} else {
_, err = cms.Create(cm)
}
if err == nil {
fmt.Printf("Function %s %s\n", name, message)
}
}
if err == nil && p.watch {
p.watchFiles()
}
return err
}
func (p *createFunctionCmd) watchFiles() {
files := p.file
if len(files) == 0 {
return
}
fmt.Println("Watching files: ", files)
fmt.Println("Please press Ctrl-C to terminate")
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Fatal(err)
}
defer watcher.Close()
matches, err := filepath.Glob(files)
if err == nil {
if len(matches) == 0 {
// TODO could we watch for folder?
log.Fatal("No files match pattern ", files)
return
}
} else {
matches = []string{files}
}
for _, file := range matches {
err = watcher.Add(file)
if err != nil {
log.Fatal(err)
}
}
for {
select {
case event := <-watcher.Events:
if event.Op&fsnotify.Rename == fsnotify.Rename {
// if a file is renamed (e.g. IDE may do that) we no longer get any more events
// so lets add the files again to be sure
if isExistingFile(event.Name) {
err = watcher.Add(event.Name)
if err != nil {
fmt.Printf("Failed to watch file %s due to %v\n", event.Name, err)
}
}
}
err = p.applyFile(event.Name)
if err != nil {
fmt.Printf("Failed to apply function file %s due to %v\n", event.Name, err)
}
case err := <-watcher.Errors:
log.Println("error:", err)
}
}
}
func isExistingFile(name string) bool {
s, err := os.Stat(name)
if err != nil {
return false
}
return s.Mode().IsRegular()
}
func isExistingDir(name string) bool {
s, err := os.Stat(name)
if err != nil {
return false
}
return s.Mode().IsDir()
}
func (p *createFunctionCmd) applyFile(fileName string) error {
if !isExistingFile(fileName) {
return nil
}
source, err := loadFileSource(fileName)
if err != nil || len(source) == 0 {
// ignore errors or blank source
return nil
}
if !p.functionsOnly {
if strings.HasSuffix(fileName, flowExtension) {
return p.applyFlow(fileName, source)
}
}
runtime, err := p.findRuntimeFromFileName(fileName)
if err != nil {
fmt.Printf("Failed to find runtime for file %s due to %v", fileName, err)
}
if len(runtime) == 0 {
return nil
}
listOpts, err := funktion.CreateFunctionListOptions()
if err != nil {
return err
}
name := nameFromFile(fileName, "")
if len(name) == 0 {
return fmt.Errorf("Could not generate a function name!")
}
kubeclient := p.kubeclient
cms := kubeclient.ConfigMaps(p.namespace)
resources, err := cms.List(*listOpts)
if err != nil {
return err
}
var old *v1.ConfigMap = nil
for _, resource := range resources.Items {
if resource.Name == name {
old = &resource
break
}
}
defaultLabels := map[string]string{}
abs, err := filepath.Abs(fileName)
if err == nil && len(abs) > 0 {
folderName := convertToSafeLabelValue(filepath.Base(filepath.Dir(abs)))
if len(folderName) > 0 {
defaultLabels[funktion.ProjectLabel] = folderName
}
}
cm, err := p.createFunctionFromSource(name, source, runtime, defaultLabels)
if err != nil {
return err
}
message := "created"
if old != nil {
oldSource := old.Data[funktion.SourceProperty]
if source == oldSource && cm.Data[funktion.EnvVarsProperty] == old.Data[funktion.EnvVarsProperty] {
// source not changed so lets not update!
return nil
}
_, err = cms.Update(cm)
message = "updated"
} else {
_, err = cms.Create(cm)
}
if err == nil {
log.Println("Function", name, message)
}
return err
}
// findRuntimeFromFileName returns the runtime to use for the given file name
// or an empty string if the file does not map to a runtime function source file
func (p *createFunctionCmd) findRuntimeFromFileName(fileName string) (string, error) {
// TODO we may want to use a cache and watch the runtimes to minimise API churn here on runtimes...
listOpts, err := funktion.CreateRuntimeListOptions()
if err != nil {
return "", err
}
kubeclient := p.kubeclient
cms := kubeclient.ConfigMaps(p.namespace)
resources, err := cms.List(*listOpts)
if err != nil {
return "", err
}
ext := strings.TrimPrefix(filepath.Ext(fileName), ".")
for _, resource := range resources.Items {
data := resource.Data
if data != nil {
extensions := data[funktion.FileExtensionsProperty]
if len(extensions) > 0 {
values := strings.Split(extensions, ",")
for _, value := range values {
if ext == value {
return resource.Name, nil
}
}
}
}
}
return "", nil
}
// returns the name of the resource to use given the fileName and the configured name
// if there is a configured name we will use that otherwise we will use the file name
// without the extension
func nameFromFile(fileName, configuredName string) string {
if len(configuredName) != 0 {
return convertToSafeResourceName(configuredName)
}
if len(fileName) == 0 {
return ""
}
_, name := filepath.Split(fileName)
ext := filepath.Ext(name)
l := len(ext)
if l > 0 {
name = name[0 : len(name)-l]
}
return convertToSafeResourceName(name)
}
func (p *createFunctionCmd) generateName() (string, error) {
prefix := "function"
counter := 1
for {
name := prefix + strconv.Itoa(counter)
if p.configMaps[name] == nil {
return name, nil
}
counter++
}
}
func (p *createFunctionCmd) createFunction(name string) (*v1.ConfigMap, error) {
source := p.source
if len(source) == 0 {
file := p.file
if len(file) == 0 {
return nil, fmt.Errorf("No function source code or file name supplied! You must specify either -s or -f flags")
}
var err error
source, err = loadFileSource(file)
if err != nil {
return nil, err
}
}
runtime := p.runtime
if len(runtime) == 0 {
return nil, fmt.Errorf("No runtime supplied! Please pass `-n nodejs` or some other valid runtime")
}
err := p.checkRuntimeExists(runtime)
if err != nil {
return nil, err
}
defaultLabels := map[string]string{}
return p.createFunctionFromSource(name, source, runtime, defaultLabels)
}
func (p *createFunctionCmd) createFunctionFromSource(name, source, runtime string, extraLabels map[string]string) (*v1.ConfigMap, error) {
labels := map[string]string{
funktion.KindLabel: funktion.FunctionKind,
funktion.RuntimeLabel: runtime,
}
for k, v := range extraLabels {
if labels[k] == "" {
labels[k] = v
}
}
data := map[string]string{
funktion.SourceProperty: source,
}
if p.debug {
data[funktion.DebugProperty] = "true"
}
if len(p.envVars) > 0 {
data[funktion.EnvVarsProperty] = strings.Join(p.envVars, "\n")
}
cm := &v1.ConfigMap{
ObjectMeta: v1.ObjectMeta{
Name: name,
Labels: labels,
},
Data: data,
}
return cm, nil
}
func loadFileSource(fileName string) (string, error) {
data, err := ioutil.ReadFile(fileName)
if err != nil {
return "", err
}
source := string(data)
return source, nil
}
func (p *createFunctionCmd) checkRuntimeExists(name string) error {
listOpts, err := funktion.CreateRuntimeListOptions()
if err != nil {
return err
}
cms, err := p.kubeclient.ConfigMaps(p.namespace).List(*listOpts)
if err != nil {
return err
}
for _, resource := range cms.Items {
if resource.Name == name {
return nil
}
}
return fmt.Errorf("No runtime exists called `%s`", name)
}