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server.go
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server.go
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package server
import (
"context"
"fmt"
"net/http"
"os"
"time"
"google.golang.org/grpc/credentials/insecure"
"github.com/dictyBase/graphql-server/internal/app/middleware"
"github.com/dictyBase/graphql-server/internal/authentication"
"github.com/dictyBase/graphql-server/internal/graphql/dataloader"
"github.com/dictyBase/graphql-server/internal/graphql/generated"
"github.com/dictyBase/graphql-server/internal/graphql/resolver"
"github.com/dictyBase/graphql-server/internal/registry"
"github.com/dictyBase/graphql-server/internal/repository/redis"
"github.com/go-chi/cors"
"google.golang.org/grpc"
"github.com/99designs/gqlgen/graphql/handler"
"github.com/99designs/gqlgen/graphql/playground"
"github.com/go-chi/chi"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
// RunGraphQLServer starts the GraphQL backend
func RunGraphQLServer(cltx *cli.Context) error {
nreg := registry.NewRegistry()
err := establishGrpcConnnections(cltx, nreg)
if err != nil {
return cli.NewExitError(err.Error(), 2)
}
addEndpoints(cltx, nreg)
err = initRedis(cltx, nreg)
if err != nil {
return cli.NewExitError(err.Error(), 2)
}
log := getLogger(cltx)
router := chi.NewRouter()
// initialize the dataloaders, add middlewares, run the server etc...
dl := dataloader.NewRetriever()
s := resolver.NewResolver(nreg, dl, log)
crs := getCORS(cltx.StringSlice("allowed-origin"))
router.Use(crs.Handler)
authMdw, err := middleware.NewJWTAuth(
cltx.String("jwks-uri"),
cltx.String("jwt-audience"),
cltx.String("issuer"),
)
if err != nil {
return cli.NewExitError(
fmt.Sprintf("error in creating jwt auth middleware %s", err),
2,
)
}
router.Use(authMdw.JwtHandler)
router.Use(dataloader.DataloaderMiddleware(nreg))
execSchema := generated.NewExecutableSchema(generated.Config{Resolvers: s})
srv := handler.NewDefaultServer(execSchema)
router.Handle("/", playground.Handler("GraphQL playground", "/graphql"))
router.Handle("/graphql", srv)
log.Debugf("connect to port 8080 for GraphQL playground")
hsrv := &http.Server{
Addr: ":8080",
ReadTimeout: 10 * time.Second,
WriteTimeout: 10 * time.Second,
Handler: router,
}
log.Fatal(hsrv.ListenAndServe())
return nil
}
func establishGrpcConnnections(
ctx *cli.Context,
nreg registry.Registry,
) error {
for key, val := range nreg.ServiceMap() {
conn, err := connectToGrpcService(ctx, key)
if err != nil {
return fmt.Errorf("error in connecting to grpc service %s", key)
}
nreg.AddAPIConnection(val, conn)
}
return nil
}
func connectToGrpcService(
ctx *cli.Context,
key string,
) (*grpc.ClientConn, error) {
host := ctx.String(fmt.Sprintf("%s-grpc-host", key))
port := ctx.String(fmt.Sprintf("%s-grpc-port", key))
grpcCtx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()
conn, err := grpc.DialContext(
grpcCtx,
fmt.Sprintf("%s:%s", host, port),
[]grpc.DialOption{
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithBlock(),
}...,
)
if err != nil {
return nil, fmt.Errorf("cannot connect to grpc microservice %s", err)
}
return conn, nil
}
func addEndpoints(ctx *cli.Context, nreg registry.Registry) {
nreg.AddAPIEndpoint(registry.PUBLICATION, ctx.String("publication-api"))
nreg.AddAPIEndpoint(registry.ORGANISM, ctx.String("organism-api"))
nreg.AddAuthClient(
registry.AUTH,
authentication.NewClient(&authentication.LogtoClientParams{
URL: ctx.String("auth-api-endpoint"),
AppID: ctx.String("app-id"),
AppSecret: ctx.String("app-secret"),
APIResource: ctx.String("api-resource"),
Key: "AUTHTOKEN",
TokenCache: nreg.GetRedisRepository(registry.REDISREPO),
}),
)
}
func initRedis(ctx *cli.Context, nreg registry.Registry) error {
radd := fmt.Sprintf(
"%s:%s",
ctx.String("redis-master-service-host"),
ctx.String("redis-master-service-port"),
)
cache, err := redis.NewCache(radd)
if err != nil {
return fmt.Errorf("cannot create redis cache: %v", err)
}
nreg.AddRepository(registry.REDISREPO, cache)
return nil
}
func getCORS(origins []string) *cors.Cors {
origins = append(origins, "http://localhost:*")
origins = append(origins, "https://dictybase.dev")
origins = append(origins, "https://dictybase.dev/")
origins = append(origins, "https://dictybase.dev*")
return cors.New(cors.Options{
AllowedOrigins: origins,
AllowedMethods: []string{"GET", "POST", "OPTIONS"},
AllowCredentials: true,
AllowedHeaders: []string{"*"},
})
}
func getLogger(c *cli.Context) *logrus.Entry {
log := logrus.New()
log.Out = os.Stderr
switch c.GlobalString("log-format") {
case "text":
log.Formatter = &logrus.TextFormatter{
TimestampFormat: "02/Jan/2006:15:04:05",
}
case "json":
log.Formatter = &logrus.JSONFormatter{
TimestampFormat: "02/Jan/2006:15:04:05",
}
}
lvl := c.GlobalString("log-level")
switch lvl {
case "debug":
log.Level = logrus.DebugLevel
case "warn":
log.Level = logrus.WarnLevel
case "error":
log.Level = logrus.ErrorLevel
case "fatal":
log.Level = logrus.FatalLevel
case "panic":
log.Level = logrus.PanicLevel
}
return logrus.NewEntry(log)
}