/
daemon.go
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/
daemon.go
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package mnemosyned
import (
"context"
"database/sql"
"errors"
"fmt"
"io"
"net"
"net/http"
"net/http/pprof"
"net/url"
"strings"
"sync"
"testing"
"time"
otgrpc "github.com/opentracing-contrib/go-grpc"
"github.com/opentracing/opentracing-go"
"github.com/piotrkowalczuk/mnemosyne/internal/cache"
"github.com/piotrkowalczuk/mnemosyne/internal/cluster"
"github.com/piotrkowalczuk/mnemosyne/internal/constant"
"github.com/piotrkowalczuk/mnemosyne/internal/service/postgres"
"github.com/piotrkowalczuk/mnemosyne/internal/storage"
storagepq "github.com/piotrkowalczuk/mnemosyne/internal/storage/postgres"
"github.com/piotrkowalczuk/mnemosyne/mnemosynerpc"
"github.com/piotrkowalczuk/promgrpc/v3"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"go.uber.org/zap"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/health"
"google.golang.org/grpc/health/grpc_health_v1"
)
// DaemonOpts it is constructor argument that can be passed to
// the NewDaemon constructor function.
type DaemonOpts struct {
Version string
IsTest bool
SessionTTL time.Duration
SessionTTC time.Duration
TLS bool
TLSCertFile string
TLSKeyFile string
Storage string
PostgresAddress string
PostgresTable string
PostgresSchema string
Logger *zap.Logger
RPCOptions []grpc.ServerOption
RPCListener net.Listener
DebugListener net.Listener
ClusterListenAddr string
ClusterSeeds []string
TracingAgentAddress string
}
// TestDaemonOpts set of options that are used with TestDaemon instance.
type TestDaemonOpts struct {
StoragePostgresAddress string
}
// Daemon represents single daemon instance that can be run.
type Daemon struct {
opts *DaemonOpts
done chan struct{}
serverOptions []grpc.ServerOption
clientOptions []grpc.DialOption
postgres *sql.DB
logger *zap.Logger
server *grpc.Server
storage storage.Storage
rpcListener net.Listener
debugListener net.Listener
tracerCloser io.Closer
lock sync.Mutex
}
// NewDaemon allocates new daemon instance using given options.
func NewDaemon(opts *DaemonOpts) (*Daemon, error) {
d := &Daemon{
done: make(chan struct{}),
opts: opts,
logger: opts.Logger,
serverOptions: opts.RPCOptions,
rpcListener: opts.RPCListener,
debugListener: opts.DebugListener,
}
if err := d.setPostgresConnectionParameters(); err != nil {
return nil, err
}
if d.opts.SessionTTL == 0 {
d.opts.SessionTTL = storage.DefaultTTL
}
if d.opts.SessionTTC == 0 {
d.opts.SessionTTC = storage.DefaultTTC
}
if d.opts.Storage == "" {
d.opts.Storage = storage.EnginePostgres
}
if d.opts.PostgresTable == "" {
d.opts.PostgresTable = "session"
}
if d.opts.PostgresSchema == "" {
d.opts.PostgresSchema = "mnemosyne"
}
return d, nil
}
// TestDaemon returns address of fully started in-memory daemon and closer to close it.
func TestDaemon(t *testing.T, opts TestDaemonOpts) (net.Addr, io.Closer) {
l, err := net.Listen("tcp", "127.0.0.1:0") // any available address
if err != nil {
t.Fatalf("mnemosyne daemon tcp listener setup error: %s", err.Error())
}
d, err := NewDaemon(&DaemonOpts{
IsTest: true,
ClusterListenAddr: l.Addr().String(),
Logger: zap.L(),
PostgresAddress: opts.StoragePostgresAddress,
PostgresTable: "session",
PostgresSchema: "mnemosyne",
RPCListener: l,
})
if err != nil {
t.Fatalf("mnemosyne daemon cannot be instantiated: %s", err.Error())
}
if err := d.Run(); err != nil {
t.Fatalf("mnemosyne daemon start error: %s", err.Error())
}
return d.Addr(), d
}
// Run starts daemon and all services within.
func (d *Daemon) Run() (err error) {
var (
cl *cluster.Cluster
tracer opentracing.Tracer
)
if cl, err = initCluster(d.logger, d.opts.ClusterListenAddr, d.opts.ClusterSeeds...); err != nil {
return
}
if err = d.initStorage(d.logger, d.opts.PostgresTable, d.opts.PostgresSchema); err != nil {
return
}
interceptor := promgrpc.NewInterceptor(promgrpc.InterceptorOpts{})
if d.opts.TracingAgentAddress != "" {
if tracer, d.tracerCloser, err = initJaeger(
constant.Subsystem,
d.opts.ClusterListenAddr,
d.opts.TracingAgentAddress,
d.logger.Named("tracer"),
); err != nil {
return
}
d.logger.Info("tracing enabled", zap.String("agent_address", d.opts.TracingAgentAddress))
} else {
tracer = opentracing.NoopTracer{}
}
d.clientOptions = []grpc.DialOption{
// User agent is required for example to determine if incoming request is internal.
grpc.WithUserAgent(fmt.Sprintf("%s:%s", constant.Subsystem, d.opts.Version)),
grpc.WithStatsHandler(interceptor),
grpc.WithDialer(interceptor.Dialer(func(addr string, timeout time.Duration) (net.Conn, error) {
return net.DialTimeout("tcp", addr, timeout)
})),
grpc.WithUnaryInterceptor(unaryClientInterceptors(
interceptor.UnaryClient(),
otgrpc.OpenTracingClientInterceptor(tracer)),
),
grpc.WithStreamInterceptor(interceptor.StreamClient()),
}
d.serverOptions = []grpc.ServerOption{
grpc.StatsHandler(interceptor),
grpc.UnaryInterceptor(unaryServerInterceptors(
otgrpc.OpenTracingServerInterceptor(tracer),
errorInterceptor(d.logger),
interceptor.UnaryServer(),
)),
}
if d.opts.TLS {
servCreds, err := credentials.NewServerTLSFromFile(d.opts.TLSCertFile, d.opts.TLSKeyFile)
if err != nil {
return err
}
d.serverOptions = append(d.serverOptions, grpc.Creds(servCreds))
clientCreds, err := credentials.NewClientTLSFromFile(d.opts.TLSCertFile, "")
if err != nil {
return err
}
d.clientOptions = append(d.clientOptions, grpc.WithTransportCredentials(clientCreds))
} else {
d.clientOptions = append(d.clientOptions, grpc.WithInsecure())
}
d.server = grpc.NewServer(d.serverOptions...)
cache := cache.New(5*time.Second, constant.Subsystem)
mnemosyneServer, err := newSessionManager(sessionManagerOpts{
addr: d.opts.ClusterListenAddr,
cluster: cl,
logger: d.logger,
storage: d.storage,
ttc: d.opts.SessionTTC,
cache: cache,
tracer: tracer,
})
if err != nil {
return err
}
mnemosynerpc.RegisterSessionManagerServer(d.server, mnemosyneServer)
grpc_health_v1.RegisterHealthServer(d.server, health.NewServer())
if !d.opts.IsTest {
prometheus.DefaultRegisterer.Register(d.storage.(storage.InstrumentedStorage))
prometheus.DefaultRegisterer.Register(cache)
prometheus.DefaultRegisterer.Register(mnemosyneServer)
prometheus.DefaultRegisterer.Register(interceptor)
promgrpc.RegisterInterceptor(d.server, interceptor)
}
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
if err = cl.Connect(ctx, d.clientOptions...); err != nil {
return err
}
go func() {
d.logger.Info("rpc server is running", zap.String("address", d.rpcListener.Addr().String()))
if err := d.server.Serve(d.rpcListener); err != nil {
if err == grpc.ErrServerStopped {
d.logger.Info("grpc server has been stopped")
return
}
if !strings.Contains(err.Error(), "use of closed network connection") {
d.logger.Error("rpc server failure", zap.Error(err))
}
}
}()
if d.debugListener != nil {
go func() {
d.logger.Info("debug server is running", zap.String("address", d.debugListener.Addr().String()))
mux := http.NewServeMux()
mux.Handle("/debug/pprof/", http.HandlerFunc(pprof.Index))
mux.Handle("/debug/pprof/cmdline", http.HandlerFunc(pprof.Cmdline))
mux.Handle("/debug/pprof/profile", http.HandlerFunc(pprof.Profile))
mux.Handle("/debug/pprof/symbol", http.HandlerFunc(pprof.Symbol))
mux.Handle("/debug/pprof/trace", http.HandlerFunc(pprof.Trace))
mux.Handle("/metrics", promhttp.HandlerFor(prometheus.DefaultGatherer, promhttp.HandlerOpts{}))
mux.Handle("/healthz", &livenessHandler{
livenessResponse: livenessResponse{
Version: d.opts.Version,
},
logger: d.logger,
})
mux.Handle("/healthr", &readinessHandler{
livenessResponse: livenessResponse{
Version: d.opts.Version,
},
logger: d.logger,
postgres: d.postgres,
cluster: cl,
})
if err := http.Serve(d.debugListener, mux); err != nil {
d.logger.Error("debug server failure", zap.Error(err))
}
}()
}
go mnemosyneServer.cleanup(d.done)
return
}
// Close implements io.Closer interface.
func (d *Daemon) Close() (err error) {
d.done <- struct{}{}
d.server.GracefulStop()
if d.postgres != nil {
if err = d.postgres.Close(); err != nil {
return
}
}
if d.debugListener != nil {
if err = d.debugListener.Close(); err != nil {
return
}
}
if d.tracerCloser != nil {
if err = d.tracerCloser.Close(); err != nil {
return
}
}
return nil
}
// Addr returns net.Addr that rpc service is listening on.
func (d *Daemon) Addr() net.Addr {
return d.rpcListener.Addr()
}
func (d *Daemon) initStorage(l *zap.Logger, table, schema string) (err error) {
switch d.opts.Storage {
case storage.EngineInMemory:
return errors.New("in memory storage is not implemented yet")
case storage.EnginePostgres:
d.postgres, err = postgres.Init(
d.opts.PostgresAddress,
postgres.Opts{
Logger: d.logger,
},
)
if err != nil {
return
}
if d.storage, err = storage.Init(storagepq.NewStorage(storagepq.StorageOpts{
Namespace: constant.Subsystem,
Schema: schema,
Table: table,
Conn: d.postgres,
TTL: d.opts.SessionTTL,
}), d.opts.IsTest); err != nil {
return
}
l.Info("postgres storage initialized", zap.String("schema", schema), zap.String("table", table))
return
case storage.EngineRedis:
return errors.New("redis storage is not implemented yet")
default:
return errors.New("unknown storage engine")
}
}
func (d *Daemon) setPostgresConnectionParameters() error {
u, err := url.Parse(d.opts.PostgresAddress)
if err != nil {
return err
}
v := u.Query()
v.Set("timezone", "utc")
u.RawQuery = v.Encode()
d.opts.PostgresAddress = u.String()
return nil
}