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settings.go
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settings.go
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package main
import (
"fmt"
"os"
"strings"
"github.com/op/go-logging"
"golang.org/x/net/websocket"
"github.com/microscaling/microscaling/config"
"github.com/microscaling/microscaling/demand"
"github.com/microscaling/microscaling/engine"
"github.com/microscaling/microscaling/engine/localEngine"
"github.com/microscaling/microscaling/engine/serverEngine"
"github.com/microscaling/microscaling/monitor"
"github.com/microscaling/microscaling/scheduler"
"github.com/microscaling/microscaling/scheduler/docker"
"github.com/microscaling/microscaling/scheduler/kubernetes"
"github.com/microscaling/microscaling/scheduler/marathon"
"github.com/microscaling/microscaling/scheduler/toy"
)
type settings struct {
schedulerType string
sendMetrics bool
monitorTypes string
microscalingAPI string
userID string
pullImages bool
dockerHost string
demandEngine string
marathonAPI string
config string
kubeConfig string
kubeNamespace string
configData string
}
func initLogging() {
// The MSS_LOG_DEBUG environment variable controls what logging is output
// By default the log level is INFO for all components
// Adding a component name to MSS_LOG_DEBUG makes its logging level DEBUG
// In addition, if "detail" is included in the environment variable details of the process ID and file name / line number are included in the logs
// MSS_LOG_DEBUG="all" - turn on DEBUG for all components
// MSS_LOG_DEBUG="mssapi,detail" - turn on DEBUG for the api package, and use the detailed logging format
basicLogFormat := logging.MustStringFormatter(`%{color}%{level:.4s} %{time:15:04:05.000}: %{color:reset} %{message}`)
detailLogFormat := logging.MustStringFormatter(`%{color}%{level:.4s} %{time:15:04:05.000} %{pid} %{shortfile}: %{color:reset} %{message}`)
logComponents := getEnvOrDefault("MSS_LOG_DEBUG", "none")
if strings.Contains(logComponents, "detail") {
logging.SetFormatter(detailLogFormat)
} else {
logging.SetFormatter(basicLogFormat)
}
logBackend := logging.NewLogBackend(os.Stdout, "", 0)
logging.SetBackend(logBackend)
var components = []string{"mssagent", "mssapi", "mssconfig", "mssdemand", "mssengine", "mssmetric", "mssscheduler", "msstarget", "mssutils"}
for _, component := range components {
if strings.Contains(logComponents, component) || strings.Contains(logComponents, "all") {
logging.SetLevel(logging.DEBUG, component)
} else {
logging.SetLevel(logging.INFO, component)
}
}
}
func getSettings() settings {
var st settings
st.schedulerType = getEnvOrDefault("MSS_SCHEDULER", "DOCKER")
st.microscalingAPI = getEnvOrDefault("MSS_API_ADDRESS", "app.microscaling.com")
st.userID = getEnvOrDefault("MSS_USER_ID", "5k5gk")
st.sendMetrics = (getEnvOrDefault("MSS_SEND_METRICS_TO_API", "true") == "true")
st.monitorTypes = getEnvOrDefault("MSS_MONITOR", "SERVER")
st.pullImages = (getEnvOrDefault("MSS_PULL_IMAGES", "true") == "true")
st.dockerHost = getEnvOrDefault("DOCKER_HOST", "unix:///var/run/docker.sock")
st.demandEngine = getEnvOrDefault("MSS_DEMAND_ENGINE", "LOCAL")
st.marathonAPI = getEnvOrDefault("MSS_MARATHON_API", "http://localhost:8080")
st.config = getEnvOrDefault("MSS_CONFIG", "SERVER")
st.configData = getEnvOrDefault("MSS_CONFIG_DATA", "")
// To run locally set kube config location. Otherwise uses the built in cluster config.
st.kubeConfig = getEnvOrDefault("MSS_KUBE_CONFIG", "")
st.kubeNamespace = getEnvOrDefault("MSS_KUBE_NAMESPACE", "default")
return st
}
func getScheduler(st settings, demandUpdate chan struct{}) (scheduler.Scheduler, error) {
var s scheduler.Scheduler
switch st.schedulerType {
case "DOCKER":
log.Info("Scheduling with Docker remote API")
s = docker.NewScheduler(st.pullImages, st.dockerHost)
case "MARATHON":
log.Info("Scheduling with Mesos / Marathon")
s = marathon.NewScheduler(st.marathonAPI, demandUpdate)
case "ECS":
return nil, fmt.Errorf("Scheduling with ECS not yet supported. Tweet with hashtag #MicroscaleECS if you'd like us to add this next!")
case "KUBERNETES":
log.Info("Scheduling with Kubernetes")
s = kubernetes.NewScheduler(st.kubeConfig, st.kubeNamespace, demandUpdate)
case "NOMAD":
return nil, fmt.Errorf("Scheduling with Nomad not yet supported. Tweet with hashtag #MicroscaleNomad if you'd like us to add this next!")
case "TOY":
log.Info("Scheduling with toy scheduler")
s = toy.NewScheduler()
default:
return nil, fmt.Errorf("Bad value for MSS_SCHEDULER: %s", st.schedulerType)
}
if s == nil {
return nil, fmt.Errorf("No scheduler")
}
return s, nil
}
func getTasks(st settings) (tasks *demand.Tasks, err error) {
var c config.Config
tasks = new(demand.Tasks)
// Get the tasks that have been configured by this user
switch st.config {
case "FILE":
return nil, fmt.Errorf("Config file not yet supported")
case "SERVER":
c = config.NewServerConfig(st.microscalingAPI)
case "HARDCODED":
c = config.NewHardcodedConfig()
case "LABEL":
switch st.schedulerType {
case "DOCKER":
// Gets labels for the configured image from the MicroBadger API
c = config.NewLabelConfig(st.microscalingAPI)
case "KUBERNETES":
// Gets the image from the k8s deployment and the labels from the MicroBadger API
c = config.NewKubeLabelConfig(st.microscalingAPI, st.kubeConfig, st.kubeNamespace)
default:
return nil, fmt.Errorf("Label config not supported for scheduler: %s", st.config)
}
case "ENVVAR":
c = config.NewEnvVarConfig(st.configData)
default:
return nil, fmt.Errorf("Bad value for MSS_CONFIG: %s", st.config)
}
t, maxContainers, err := c.GetApps(st.userID)
tasks.MaxContainers = maxContainers
// For now pass the whole environment to all containers.
globalEnv := os.Environ()
for _, task := range t {
task.Env = globalEnv
log.Debugf("%+v", task)
}
tasks.Tasks = t
if err != nil {
log.Errorf("Error getting tasks: %v", err)
}
return tasks, err
}
func getDemandEngine(st settings, ws *websocket.Conn) (e engine.Engine, err error) {
switch st.demandEngine {
case "LOCAL":
log.Info("Calculate demand locally")
e = localEngine.NewEngine()
case "SERVER":
log.Info("Get demand from server")
e = serverEngine.NewEngine(ws)
default:
return nil, fmt.Errorf("Bad value for MSS_DEMAND_ENGINE: %s", st.demandEngine)
}
return e, nil
}
func getMonitors(st settings, ws *websocket.Conn) (m []monitor.Monitor) {
// Monitor is where we send results & output. There might be more than one so we return a list
if strings.Contains(st.monitorTypes, "SERVER") {
log.Info("Server is a monitor")
ms := monitor.NewServerMonitor(ws, st.userID)
m = append(m, ms)
}
return
}
func getEnvOrDefault(name string, defaultValue string) string {
v := os.Getenv(name)
if v == "" {
v = defaultValue
}
return v
}