Initial rough project skeleton (#2)

* Initial setup

* Update diagram

* Update diabram

* Delete png diagram

* Move files around.

* Initial commit of executor code

* Adding monitoring of nodes/pod utilitsation for use in executor

* Removing pre-mature addition of circleci config

* Removing unused createPod from executor/main

This is just cluttering the file and is never used (And if it was used, should never be placed here)

* Tidying file line endings

README.md

@@ -13,4 +13,12 @@ To achieve fairness between users we have implemented a Condor like algorithm to
 
 Current implementation utilises Redis to store queues of jobs. Redis streams are used for job events.
 
-![Diagram](./batch-api.png)
+![Diagram](./batch-api.svg)
+
+
+
+## Developer setup
+Run local redis 
+```
+sudo docker run --expose=6379 --network=host redis
+```

api-requests.rest

@@ -0,0 +1,12 @@
+POST http://localhost:8080/jobs HTTP/1.1
+content-type: application/json
+
+[{
+    "queue": "test",
+    "priority": 2,
+    "podSpec": {
+    }
+}]
+
+###
+

cmd/api/main.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/go-redis/redis"
+
+	"github.com/G-Research/k8s-batch/internal/model"
+	"github.com/G-Research/k8s-batch/internal/repository"
+)
+
+func main() {
+	r := gin.Default()
+	db := redis.NewClient(&redis.Options{
+		Addr:     "localhost:6379",
+		Password: "", // no password set
+		DB:       0,  // use default DB
+	})
+
+	r.POST("jobs", func(c *gin.Context) {
+		var jobs []model.JobRequest
+
+		err := c.Bind(&jobs)
+		if err != nil {
+			sendError(c, err)
+			return
+		}
+		err = repository.AddJobs(db, jobs)
+		if err != nil {
+			sendError(c, err)
+			return
+		}
+
+		c.JSON(http.StatusOK, gin.H{
+			"message": "ok",
+		})
+	})
+
+	r.GET("/ping", func(c *gin.Context) {
+		c.JSON(200, gin.H{
+			"message": "pong",
+		})
+	})
+	r.Run() // listen and serve on 0.0.0.0:8080
+}
+
+func sendError(c *gin.Context, e error) {
+	c.JSON(http.StatusBadRequest, gin.H{
+		"errorMessage": e.Error(),
+	})
+}

cmd/executor/main.go

@@ -0,0 +1,83 @@
+package main
+
+import (
+	"fmt"
+	"github.com/G-Research/k8s-batch/internal/reporter"
+	"github.com/G-Research/k8s-batch/internal/service"
+	"github.com/G-Research/k8s-batch/internal/startup"
+	"github.com/G-Research/k8s-batch/internal/submitter"
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/util/runtime"
+	"k8s.io/client-go/informers"
+	v12 "k8s.io/client-go/informers/core/v1"
+	"k8s.io/client-go/tools/cache"
+	"os"
+	"time"
+)
+
+func main() {
+	kubernetesClient, err := startup.LoadDefaultKubernetesClient()
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(-1)
+	}
+
+	//tweakOptionsFunc := func(options *metav1.ListOptions) {
+	//	options.LabelSelector = "node-role.startup.io/master"
+	//}
+	//tweakOptions := informers.WithTweakListOptions(tweakOptionsFunc)
+	//factory := informers.NewSharedInformerFactoryWithOptions(clientset, 0, tweakOptions)
+
+	podEventReporter := reporter.PodEventReporter{ KubernetesClient: kubernetesClient }
+
+	factory := informers.NewSharedInformerFactoryWithOptions(kubernetesClient, 0)
+	podWatcher := initializePodWatcher(factory, podEventReporter)
+
+	nodeWatcher := factory.Core().V1().Nodes()
+	nodeLister := nodeWatcher.Lister()
+
+	defer runtime.HandleCrash()
+	stopper := make(chan struct{})
+	defer close(stopper)
+	factory.Start(stopper)
+
+	jobSubmitter := submitter.JobSubmitter{KubernetesClient:kubernetesClient}
+
+	kubernetesAllocationService := service.KubernetesAllocationService{
+		PodLister: podWatcher.Lister(),
+		NodeLister: nodeLister,
+		JobSubmitter: jobSubmitter,
+	}
+
+	for {
+		time.Sleep(5 * time.Second)
+
+		kubernetesAllocationService.FillInSpareClusterCapacity()
+	}
+}
+
+func initializePodWatcher(factory informers.SharedInformerFactory, eventReporter reporter.PodEventReporter) v12.PodInformer {
+	podWatcher := factory.Core().V1().Pods()
+	podWatcher.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
+		AddFunc: func(obj interface{}) {
+			pod, ok := obj.(*v1.Pod)
+			if !ok {
+				return
+			}
+			eventReporter.ReportAddEvent(pod)
+		},
+
+		UpdateFunc: func(oldObj, newObj interface{}) {
+			oldPod, ok := oldObj.(*v1.Pod)
+			if !ok {
+				return
+			}
+			newPod, ok := newObj.(*v1.Pod)
+			if !ok {
+				return
+			}
+			eventReporter.ReportUpdateEvent(oldPod, newPod)
+		},
+	})
+	return podWatcher
+}

go.mod

@@ -0,0 +1,19 @@
+module github.com/G-Research/k8s-batch
+
+go 1.12
+
+require (
+	github.com/gin-gonic/gin v1.4.0
+	github.com/go-redis/redis v6.15.2+incompatible
+	github.com/imdario/mergo v0.3.7 // indirect
+	github.com/kjk/betterguid v0.0.0-20170621091430-c442874ba63a
+	github.com/oklog/ulid v1.3.1
+	golang.org/x/net v0.0.0-20190620200207-3b0461eec859 // indirect
+	golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45 // indirect
+	golang.org/x/sys v0.0.0-20190626221950-04f50cda93cb // indirect
+	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
+	k8s.io/api v0.0.0-20190620084959-7cf5895f2711
+	k8s.io/apimachinery v0.0.0-20190612205821-1799e75a0719
+	k8s.io/client-go v0.0.0-20190620085101-78d2af792bab
+	k8s.io/utils v0.0.0-20190607212802-c55fbcfc754a // indirect
+)

go.sum

@@ -0,0 +1,134 @@
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internal/model/model.go

@@ -0,0 +1,53 @@
+package model
+
+import (
+	"time"
+
+	v1 "k8s.io/api/core/v1"
+)
+
+type JobRequest struct {
+	Queue    string      `json:"queue" binding:"required"`
+	JobSetId string      `json:"jobSetId" binding:"required"`
+	Priority float64     `json:"priority"`
+	PodSpec  *v1.PodSpec `json:"podSpec" binding:"required"`
+}
+
+type JobStatus int
+
+const (
+	Queued     = iota // queued outside cluster
+	Submitting = iota // send to the cluster, no confirmation available yet
+	Pending    = iota // aknowledged by the cluster, not started yet
+	Running    = iota
+	Succeeded  = iota // job finished with exit code 0
+	Failed     = iota // failed to start or finished with non zero exit code
+	Cancelling = iota // Cancellation of job was requested
+	Cancelled  = iota
+)
+
+type Job struct {
+	Id       string
+	JobSetId string
+	Queue    string
+
+	Status    JobStatus
+	ClusterId string
+	Priority  float64
+
+	Resource ComputeResource
+	PodSpec  *v1.PodSpec
+
+	Created time.Time
+}
+
+type JobEvent struct {
+	SequenceId string
+	JobId      string
+	JobSetId   string
+	Status     JobStatus
+	Created    time.Time
+}
+
+type ComputeResource struct {
+}