/
main.go
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/
main.go
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package main
import (
"context"
"fmt"
"net/http"
"os"
"strconv"
"time"
"github.com/elastic/go-elasticsearch/v8"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
"go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.7.0"
"github.com/fluxninja/aperture/playground/resources/demo-app/app"
"github.com/fluxninja/aperture/v2/pkg/log"
)
type (
rabbitMQEnvVar string
elasticsearchEnvVar string
pgsqlEnvVar string
)
const (
rabbitMQEnabledEnvVar rabbitMQEnvVar = "SIMPLE_SERVICE_RABBITMQ_ENABLED"
rabbitMQHostEnvVar rabbitMQEnvVar = "SIMPLE_SERVICE_RABBITMQ_HOST"
rabbitMQPortEnvVar rabbitMQEnvVar = "SIMPLE_SERVICE_RABBITMQ_PORT"
rabbitMQUsernameEnvVar rabbitMQEnvVar = "SIMPLE_SERVICE_RABBITMQ_USERNAME"
rabbitMQPasswordEnvVar rabbitMQEnvVar = "SIMPLE_SERVICE_RABBITMQ_PASSWORD"
elasticsearchEnabledEnvVar elasticsearchEnvVar = "SIMPLE_SERVICE_ELASTICSEARCH_ENABLED"
elasticsearchHostEnvVar elasticsearchEnvVar = "SIMPLE_SERVICE_ELASTICSEARCH_HOST"
elasticsearchPortEnvVar elasticsearchEnvVar = "SIMPLE_SERVICE_ELASTICSEARCH_PORT"
elasticsearchUsernameEnvVar elasticsearchEnvVar = "SIMPLE_SERVICE_ELASTICSEARCH_USERNAME"
elasticsearchPasswordEnvVar elasticsearchEnvVar = "SIMPLE_SERVICE_ELASTICSEARCH_PASSWORD"
pgsqlEnabledEnvVar pgsqlEnvVar = "SIMPLE_SERVICE_PGSQL_ENABLED"
pgsqlHostEnvVar pgsqlEnvVar = "SIMPLE_SERVICE_PGSQL_HOST"
pgsqlPortEnvVar pgsqlEnvVar = "SIMPLE_SERVICE_PGSQL_PORT"
pgsqlUserEnvVar pgsqlEnvVar = "SIMPLE_SERVICE_PGSQL_USER"
pgsqlPasswordEnvVar pgsqlEnvVar = "SIMPLE_SERVICE_PGSQL_PASSWORD"
)
func main() {
hostname := hostnameFromEnv()
port := portFromEnv()
envoyPort := envoyPortFromEnv()
concurrency := concurrencyFromEnv()
latency := latencyFromEnv()
rejectRatio := rejectRatioFromEnv()
cpuLoadPercentage := cpuLoadPercentageFromEnv()
// RabbitMQ related setup
rabbitMQURL := ""
if rabbitMQFromEnv(rabbitMQEnabledEnvVar) == "true" {
rabbitMQHost := rabbitMQFromEnv(rabbitMQHostEnvVar)
rabbitMQPort := rabbitMQFromEnv(rabbitMQPortEnvVar)
rabbitMQUsername := rabbitMQFromEnv(rabbitMQUsernameEnvVar)
rabbitMQPassword := rabbitMQFromEnv(rabbitMQPasswordEnvVar)
rabbitMQURL = "amqp://" + rabbitMQUsername + ":" + rabbitMQPassword + "@" + rabbitMQHost + ":" + rabbitMQPort + "/"
}
// Elasticsearch related setup
elaticsearchConfig := elasticsearch.Config{}
if elasticsearchFromEnv(elasticsearchEnabledEnvVar) == "true" {
elasticsearchHost := elasticsearchFromEnv(elasticsearchHostEnvVar)
elasticsearchPort := elasticsearchFromEnv(elasticsearchPortEnvVar)
elasticsearchUserName := elasticsearchFromEnv(elasticsearchUsernameEnvVar)
elasticsearchPassword := elasticsearchFromEnv(elasticsearchPasswordEnvVar)
elaticsearchConfig = elasticsearch.Config{
Addresses: []string{
"http://" + elasticsearchHost + ":" + elasticsearchPort,
},
Transport: &http.Transport{
MaxIdleConnsPerHost: 1,
MaxIdleConns: 1,
MaxConnsPerHost: 1000,
DisableKeepAlives: true,
},
DiscoverNodesOnStart: true,
DiscoverNodesInterval: 60 * time.Second,
Username: elasticsearchUserName,
Password: elasticsearchPassword,
}
}
// PostgreSQL related setup
pgsqlURL := ""
if pgsqlFromEnv(pgsqlEnabledEnvVar) == "true" {
pgsqlHost := pgsqlFromEnv(pgsqlHostEnvVar)
pgsqlPort := pgsqlFromEnv(pgsqlPortEnvVar)
pgsqlUser := pgsqlFromEnv(pgsqlUserEnvVar)
pgsqlPassword := pgsqlFromEnv(pgsqlPasswordEnvVar)
pgsqlURL = fmt.Sprintf("postgres://%v:%v@%v:%v/%v?sslmode=disable", pgsqlUser, pgsqlPassword, pgsqlHost, pgsqlPort, pgsqlUser)
}
// We do not necessarily need tracing providers (just propagators), but lets
// do them anyway to have a "more realistic" otel usage
// exporter, err := stdouttrace.New(stdouttrace.WithPrettyPrint())
// if err != nil {
// log.Panic().Err(err).Msgf("Failed to set up exporter: %v", err)
// }
tp := trace.NewTracerProvider(
// trace.WithBatcher(exporter),
trace.WithResource(newResource()),
)
defer func() {
if err := tp.Shutdown(context.Background()); err != nil {
log.Fatal().Err(err).Msg("Failed to shutdown tracer")
}
}()
otel.SetTracerProvider(tp)
// Setup Propagators
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
))
service := app.NewSimpleService(hostname, port, envoyPort, rabbitMQURL, elaticsearchConfig, pgsqlURL, concurrency, latency, rejectRatio, cpuLoadPercentage)
err := service.Run()
if err != nil {
log.Error().Err(err).Send()
}
}
func rabbitMQFromEnv(envVar rabbitMQEnvVar) string {
value := os.Getenv(string(envVar))
if value == "" {
switch envVar {
case rabbitMQEnabledEnvVar:
return "false"
case rabbitMQHostEnvVar:
return "localhost"
case rabbitMQPortEnvVar:
return "5672"
case rabbitMQUsernameEnvVar:
return "user"
case rabbitMQPasswordEnvVar:
return ""
default:
return ""
}
}
return value
}
func elasticsearchFromEnv(envVar elasticsearchEnvVar) string {
value := os.Getenv(string(envVar))
if value == "" {
switch envVar {
case elasticsearchEnabledEnvVar:
return "false"
case elasticsearchHostEnvVar:
return "localhost"
case elasticsearchPortEnvVar:
return "9200"
case elasticsearchUsernameEnvVar:
return "elastic"
case elasticsearchPasswordEnvVar:
return ""
default:
return ""
}
}
return value
}
func pgsqlFromEnv(envVar pgsqlEnvVar) string {
value := os.Getenv(string(envVar))
if value == "" {
switch envVar {
case pgsqlEnabledEnvVar:
return "false"
case pgsqlHostEnvVar:
return "localhost"
case pgsqlPortEnvVar:
return "5432"
case pgsqlUserEnvVar:
return "postgres"
case pgsqlPasswordEnvVar:
return ""
default:
return ""
}
}
return value
}
func envoyPortFromEnv() int {
portValue, exists := os.LookupEnv("ENVOY_EGRESS_PORT")
if !exists {
// We do not use manually configured envoy proxy
return -1
}
envoyPort, err := strconv.Atoi(portValue)
if err != nil {
log.Panic().Err(err).Msg("Failed converting ENVOY_EGRESS_PORT value")
}
return envoyPort
}
func portFromEnv() int {
port, err := strconv.Atoi(os.Getenv("SIMPLE_SERVICE_PORT"))
if err != nil {
log.Panic().Err(err).Msg("Failed converting SIMPLE_SERVICE_PORT")
}
return port
}
func hostnameFromEnv() string {
return os.Getenv("HOSTNAME")
}
func concurrencyFromEnv() int {
concurrencyValue, exists := os.LookupEnv("SIMPLE_SERVICE_CONCURRENCY")
if !exists {
return 10
}
concurrency, err := strconv.Atoi(concurrencyValue)
if err != nil {
log.Panic().Err(err).Msg("Failed converting SIMPLE_SERVICE_CONCURRENCY")
}
return concurrency
}
func latencyFromEnv() time.Duration {
latencyValue, exists := os.LookupEnv("SIMPLE_SERVICE_LATENCY")
if !exists {
return time.Millisecond * 50
}
latency, err := time.ParseDuration(latencyValue)
if err != nil {
log.Panic().Err(err).Msg("Failed converting SIMPLE_SERVICE_LATENCY")
}
return latency
}
func rejectRatioFromEnv() float64 {
rejectRatioValue, exists := os.LookupEnv("SIMPLE_SERVICE_REJECT_RATIO")
if !exists {
return 0.05
}
rejectRatio, err := strconv.ParseFloat(rejectRatioValue, 64)
if err != nil {
log.Panic().Err(err).Msg("Failed converting SIMPLE_SERVICE_REJECT_RATIO")
}
return rejectRatio
}
func cpuLoadPercentageFromEnv() int {
loadCPUValue, exists := os.LookupEnv("SIMPLE_SERVICE_CPU_LOAD")
if !exists {
return 0
}
loadCPUI64, err := strconv.ParseInt(loadCPUValue, 10, 32)
if err != nil {
log.Panic().Err(err).Msg("Failed converting SIMPLE_SERVICE_CPU_LOAD")
}
loadCPU := int(loadCPUI64)
if loadCPU < 0 || loadCPU > 100 {
log.Panic().Msg("SIMPLE_SERVICE_CPU_LOAD must be between 0 and 100")
}
return loadCPU
}
// newResource returns a resource describing this application.
func newResource() *resource.Resource {
r, _ := resource.Merge(
resource.Default(),
resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceNameKey.String("demoapp"),
semconv.ServiceVersionKey.String("v0.1.0"),
attribute.String("environment", "demo"),
),
)
return r
}