forked from openfaas/faas-netes
/
deploy.go
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/
deploy.go
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// Copyright (c) Alex Ellis 2017. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
package handlers
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"regexp"
"github.com/openfaas/faas/gateway/requests"
apiv1 "k8s.io/api/core/v1"
v1 "k8s.io/api/core/v1"
v1beta1 "k8s.io/api/extensions/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/client-go/kubernetes"
)
const DefaultFunctionNamespace string = "default"
// ValidateDeployRequest validates that the service name is valid for Kubernetes
func ValidateDeployRequest(request *requests.CreateFunctionRequest) error {
var validDNS = regexp.MustCompile(`^[a-zA-Z\-]+$`)
matched := validDNS.MatchString(request.Service)
if matched {
return nil
}
return fmt.Errorf("(%s) must be a valid DNS entry for service name", request.Service)
}
// MakeDeployHandler creates a handler to create new functions in the cluster
func MakeDeployHandler(functionNamespace string, clientset *kubernetes.Clientset) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
body, _ := ioutil.ReadAll(r.Body)
request := requests.CreateFunctionRequest{}
err := json.Unmarshal(body, &request)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
return
}
if err := ValidateDeployRequest(&request); err != nil {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte(err.Error()))
return
}
deploymentSpec := makeDeploymentSpec(request)
deploy := clientset.Extensions().Deployments(functionNamespace)
_, err = deploy.Create(deploymentSpec)
if err != nil {
log.Println(err)
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
return
}
log.Println("Created deployment - " + request.Service)
service := clientset.Core().Services(functionNamespace)
serviceSpec := makeServiceSpec(request)
_, err = service.Create(serviceSpec)
if err != nil {
log.Println(err)
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
return
}
log.Println("Created service - " + request.Service)
log.Println(string(body))
w.WriteHeader(http.StatusAccepted)
}
}
func makeDeploymentSpec(request requests.CreateFunctionRequest) *v1beta1.Deployment {
envVars := buildEnvVars(request)
deploymentSpec := &v1beta1.Deployment{
TypeMeta: metav1.TypeMeta{
Kind: "Deployment",
APIVersion: "extensions/v1beta1",
},
ObjectMeta: metav1.ObjectMeta{
Name: request.Service,
},
Spec: v1beta1.DeploymentSpec{
Replicas: int32p(1),
Strategy: v1beta1.DeploymentStrategy{
Type: v1beta1.RollingUpdateDeploymentStrategyType,
RollingUpdate: &v1beta1.RollingUpdateDeployment{
MaxUnavailable: &intstr.IntOrString{
Type: intstr.Int,
IntVal: int32(0),
},
MaxSurge: &intstr.IntOrString{
Type: intstr.Int,
IntVal: int32(1),
},
},
},
RevisionHistoryLimit: int32p(10),
Template: apiv1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Name: request.Service,
Labels: map[string]string{
"faas_function": request.Service,
// "uid": fmt.Sprintf("%d", time.Now().Nanosecond()),
},
},
Spec: apiv1.PodSpec{
Containers: []apiv1.Container{
{
Name: request.Service,
Image: request.Image,
Ports: []apiv1.ContainerPort{
{ContainerPort: int32(8080), Protocol: v1.ProtocolTCP},
},
Env: envVars,
Resources: apiv1.ResourceRequirements{
Limits: apiv1.ResourceList{
//v1.ResourceCPU: resource.MustParse("100m"),
//v1.ResourceMemory: resource.MustParse("256Mi"),
},
},
ImagePullPolicy: v1.PullAlways,
},
},
RestartPolicy: v1.RestartPolicyAlways,
DNSPolicy: v1.DNSClusterFirst,
},
},
},
}
return deploymentSpec
}
func makeServiceSpec(request requests.CreateFunctionRequest) *v1.Service {
serviceSpec := &v1.Service{
TypeMeta: metav1.TypeMeta{
Kind: "Service",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: request.Service,
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
Selector: map[string]string{"faas_function": request.Service},
Ports: []v1.ServicePort{
{
Protocol: v1.ProtocolTCP,
Port: 8080,
TargetPort: intstr.IntOrString{
Type: intstr.Int,
IntVal: int32(8080),
},
},
},
},
}
return serviceSpec
}
func buildEnvVars(request requests.CreateFunctionRequest) []v1.EnvVar {
envVars := []v1.EnvVar{}
if len(request.EnvProcess) > 0 {
envVar := v1.EnvVar{
Name: "fprocess",
Value: request.EnvProcess,
}
envVars = append(envVars, envVar)
}
for k, v := range request.EnvVars {
if len(request.EnvProcess) > 0 {
envVar := v1.EnvVar{
Name: k,
Value: v,
}
envVars = append(envVars, envVar)
}
}
return envVars
}
func int32p(i int32) *int32 {
return &i
}