/
server.go
175 lines (155 loc) · 5.19 KB
/
server.go
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package gateway
import (
"context"
"fmt"
"io/ioutil"
"log"
"net/http"
"time"
"github.com/firstcontributions/backend/internal/gateway/configs"
"github.com/firstcontributions/backend/internal/gateway/csrf"
"github.com/firstcontributions/backend/internal/gateway/models/redis"
"github.com/firstcontributions/backend/internal/gateway/session"
graphqlschema "github.com/firstcontributions/backend/internal/graphql/schema"
"github.com/firstcontributions/backend/internal/models/issuesstore/githubstore"
storymongo "github.com/firstcontributions/backend/internal/models/storiesstore/mongo"
usermongo "github.com/firstcontributions/backend/internal/models/usersstore/mongo"
"github.com/firstcontributions/backend/internal/storemanager"
"github.com/gorilla/mux"
"github.com/gorilla/securecookie"
"github.com/graph-gophers/graphql-go"
"github.com/graph-gophers/graphql-go/relay"
otelgraphql "github.com/graph-gophers/graphql-go/trace/otel"
"github.com/rs/cors"
"go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/exporters/jaeger"
"go.opentelemetry.io/otel/sdk/resource"
tracesdk "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.10.0"
)
// Server encapsulates the connection objects and configs for
// the gateway server
type Server struct {
*configs.Config
SessionManager *session.Manager
CookieManager *securecookie.SecureCookie
Router *mux.Router
CSRFManager *csrf.Manager
Store *storemanager.Store
}
// NewServer returns an instance of server
func NewServer() *Server {
return &Server{
Config: &configs.Config{},
}
}
// Init will initialise configs, connections etc.
func (s *Server) Init() error {
var err error
if err := s.DecodeEnv(); err != nil {
return fmt.Errorf("could not initialize config, Error: %w", err)
}
s.SessionManager = session.NewManager(
redis.NewSessionStore(
*s.RedisConfig.Host,
*s.RedisConfig.Port,
*s.RedisConfig.Password,
time.Duration(*s.SessionTTLDays)*time.Hour*24,
),
)
s.CSRFManager = csrf.NewManager(
redis.NewCSRFStore(
*s.RedisConfig.Host,
*s.RedisConfig.Port,
*s.RedisConfig.Password,
time.Duration(*s.CSRFTTLSeconds)*time.Second,
),
)
s.CookieManager = securecookie.New([]byte(*s.HashKey), []byte(*s.BlockKey))
ctx := context.Background()
userStore, err := usermongo.NewUsersStore(ctx, *s.Config.MongoURL)
if err != nil {
return err
}
storyStore, err := storymongo.NewStoriesStore(ctx, *s.Config.MongoURL)
if err != nil {
return err
}
s.Store = storemanager.NewStore(githubstore.NewGitHubStore(*s.GithubConfig), storyStore, userStore)
if err := s.InitRoutes(); err != nil {
return err
}
return nil
}
func (s *Server) InitRoutes() error {
r := mux.NewRouter()
r.Use(otelmux.Middleware("gateway"))
r.HandleFunc("/v1/auth/redirect", s.AuthRedirect)
r.HandleFunc("/v1/auth/callback", s.AuthCallback)
schema, err := s.GetGraphqlSchema()
if err != nil {
return err
}
r.Handle("/v1/graphql", s.HandleSession(&relay.Handler{Schema: schema}))
r.Handle("/v1/session", s.HandleSession(s.SessionHandler()))
s.Router = r
return nil
}
func (s *Server) ListenAndServe() error {
log.Printf("listening at :%s", *s.Port)
c := cors.New(cors.Options{
AllowedOrigins: []string{"https://explorer.opensource.forum", "https://opensource.forum", "http://opensource.forum", "https://www.opensource.forum"},
AllowCredentials: true,
})
tp, err := tracerProvider()
if err != nil {
log.Fatal(err)
}
// Register our TracerProvider as the global so any imported
// instrumentation in the future will default to using it.
otel.SetTracerProvider(tp)
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
// Cleanly shutdown and flush telemetry when the application exits.
defer func(ctx context.Context) {
// Do not make the application hang when it is shutdown.
ctx, cancel = context.WithTimeout(ctx, time.Second*5)
defer cancel()
if err := tp.Shutdown(ctx); err != nil {
log.Fatal(err)
}
}(ctx)
return http.ListenAndServe(":"+*s.Port, c.Handler(s.Router))
}
func (s *Server) GetGraphqlSchema() (*graphql.Schema, error) {
schema, err := ioutil.ReadFile("./assets/schema.graphql")
if err != nil {
return nil, err
}
resolver := &graphqlschema.Resolver{}
opts := []graphql.SchemaOpt{graphql.UseFieldResolvers(), graphql.Tracer(otelgraphql.DefaultTracer())}
return graphql.MustParseSchema(string(schema), resolver, opts...), nil
}
func tracerProvider() (*tracesdk.TracerProvider, error) {
// Create the Jaeger exporter
exp, err := jaeger.New(jaeger.WithAgentEndpoint())
if err != nil {
return nil, err
}
tp := tracesdk.NewTracerProvider(
// Always be sure to batch in production.
tracesdk.WithBatcher(exp),
// Record information about this application in a Resource.
tracesdk.WithResource(resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceNameKey.String("gateway"),
attribute.String("environment", "prod"),
attribute.Int64("ID", 1),
)),
)
return tp, nil
}