/
link_service.go
173 lines (143 loc) · 4.24 KB
/
link_service.go
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package service
import (
"fmt"
"io"
"net/http"
"os"
"strconv"
httptransport "github.com/go-kit/kit/transport/http"
"github.com/gorilla/mux"
"github.com/opentracing/opentracing-go"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/uber/jaeger-client-go"
jeagerconfig "github.com/uber/jaeger-client-go/config"
"github.com/the-gigi/delinkcious/pkg/db_util"
lm "github.com/the-gigi/delinkcious/pkg/link_manager"
"github.com/the-gigi/delinkcious/pkg/link_manager_events"
"github.com/the-gigi/delinkcious/pkg/log"
om "github.com/the-gigi/delinkcious/pkg/object_model"
sgm "github.com/the-gigi/delinkcious/pkg/social_graph_client"
)
type EventSink struct {
}
type linkManagerMiddleware func(om.LinkManager) om.LinkManager
func (s *EventSink) OnLinkAdded(username string, link *om.Link) {
//log.Println("Link added")
}
func (s *EventSink) OnLinkUpdated(username string, link *om.Link) {
//log.Println("Link updated")
}
func (s *EventSink) OnLinkDeleted(username string, url string) {
//log.Println("Link deleted")
}
// createTracer returns an instance of Jaeger Tracer that samples
// 100% of traces and logs all spans to stdout.
func createTracer(service string) (opentracing.Tracer, io.Closer) {
cfg := &jeagerconfig.Configuration{
ServiceName: service,
Sampler: &jeagerconfig.SamplerConfig{
Type: "const",
Param: 1,
},
Reporter: &jeagerconfig.ReporterConfig{
LogSpans: true,
},
}
logger := jeagerconfig.Logger(jaeger.StdLogger)
tracer, closer, err := cfg.NewTracer(logger)
if err != nil {
panic(fmt.Sprintf("ERROR: cannot create tracer: %v\n", err))
}
return tracer, closer
}
func Run() {
dbHost, dbPort, err := db_util.GetDbEndpoint("link")
if err != nil {
log.Fatal(err)
}
store, err := lm.NewDbLinkStore(dbHost, dbPort, "postgres", "postgres")
if err != nil {
log.Fatal(err)
}
sgHost := os.Getenv("SOCIAL_GRAPH_MANAGER_SERVICE_HOST")
if sgHost == "" {
sgHost = "localhost"
}
sgPort := os.Getenv("SOCIAL_GRAPH_MANAGER_SERVICE_PORT")
if sgPort == "" {
sgPort = "9090"
}
port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
maxLinksPerUserStr := os.Getenv("MAX_LINKS_PER_USER")
if maxLinksPerUserStr == "" {
maxLinksPerUserStr = "10"
}
maxLinksPerUser, err := strconv.ParseInt(maxLinksPerUserStr, 10, 64)
if err != nil {
log.Fatal(err)
}
socialGraphClient, err := sgm.NewClient(fmt.Sprintf("%s:%s", sgHost, sgPort))
if err != nil {
log.Fatal(err)
}
natsHostname := os.Getenv("NATS_CLUSTER_SERVICE_HOST")
natsPort := os.Getenv("NATS_CLUSTER_SERVICE_PORT")
natsUrl := ""
var eventSink om.LinkManagerEvents
if natsHostname != "" {
natsUrl = natsHostname + ":" + natsPort
eventSink, err = link_manager_events.NewEventSender(natsUrl)
if err != nil {
log.Fatal(err)
}
} else {
eventSink = &EventSink{}
}
// Create a logger
logger := log.NewLogger("link manager")
// Create a tracer
tracer, closer := createTracer("link-manager")
defer closer.Close()
// Create the service implementation
svc, err := lm.NewLinkManager(store, socialGraphClient, natsUrl, eventSink, maxLinksPerUser)
if err != nil {
log.Fatal(err)
}
// Hook up the logging middleware to the service and the logger
svc = newLoggingMiddleware(logger)(svc)
// Hook up the metrics middleware
svc = newMetricsMiddleware()(svc)
// Hook up the tracing middleware
svc = newTracingMiddleware(tracer)(svc)
getLinksHandler := httptransport.NewServer(
makeGetLinksEndpoint(svc),
decodeGetLinksRequest,
encodeResponse,
)
addLinkHandler := httptransport.NewServer(
makeAddLinkEndpoint(svc),
decodeAddLinkRequest,
encodeResponse,
)
updateLinkHandler := httptransport.NewServer(
makeUpdateLinkEndpoint(svc),
decodeUpdateLinkRequest,
encodeResponse,
)
deleteLinkHandler := httptransport.NewServer(
makeDeleteLinkEndpoint(svc),
decodeDeleteLinkRequest,
encodeResponse,
)
r := mux.NewRouter()
r.Methods("GET").Path("/links").Handler(getLinksHandler)
r.Methods("POST").Path("/links").Handler(addLinkHandler)
r.Methods("PUT").Path("/links").Handler(updateLinkHandler)
r.Methods("DELETE").Path("/links").Handler(deleteLinkHandler)
r.Methods("GET").Path("/metrics").Handler(promhttp.Handler())
logger.Log("msg", "*** listening on ***", "port", port)
log.Fatal(http.ListenAndServe(":"+port, r))
}