/
main.go
130 lines (114 loc) · 3.41 KB
/
main.go
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// Copyright (c) Ultraviolet
// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
"encoding/json"
"fmt"
"log"
"log/slog"
"github.com/mdlayher/vsock"
"github.com/ultravioletrs/cocos/agent"
"github.com/ultravioletrs/cocos/agent/api"
agentgrpc "github.com/ultravioletrs/cocos/agent/api/grpc"
"github.com/ultravioletrs/cocos/agent/events"
"github.com/ultravioletrs/cocos/internal"
agentlogger "github.com/ultravioletrs/cocos/internal/logger"
"github.com/ultravioletrs/cocos/internal/server"
grpcserver "github.com/ultravioletrs/cocos/internal/server/grpc"
"github.com/ultravioletrs/cocos/manager"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc"
"google.golang.org/grpc/reflection"
)
const (
svcName = "agent"
defSvcGRPCPort = "7002"
)
func main() {
ctx, cancel := context.WithCancel(context.Background())
g, ctx := errgroup.WithContext(ctx)
cfg, err := readConfig()
if err != nil {
log.Fatalf("failed to read agent configuration from vsock %s", err.Error())
}
conn, err := vsock.Dial(vsock.Host, manager.ManagerVsockPort, nil)
if err != nil {
log.Fatal(err)
}
defer conn.Close()
var level slog.Level
if err := level.UnmarshalText([]byte(cfg.AgentConfig.LogLevel)); err != nil {
log.Println(err)
return
}
handler := agentlogger.NewProtoHandler(conn, &slog.HandlerOptions{Level: level})
logger := slog.New(handler)
eventSvc, err := events.New(svcName, cfg.ID, manager.ManagerVsockPort)
if err != nil {
log.Printf("failed to create events service %s", err.Error())
return
}
defer eventSvc.Close()
svc := newService(ctx, logger, eventSvc, cfg)
grpcServerConfig := server.Config{
Port: cfg.AgentConfig.Port,
Host: cfg.AgentConfig.Host,
CertFile: cfg.AgentConfig.CertFile,
KeyFile: cfg.AgentConfig.KeyFile,
ServerCAFile: cfg.AgentConfig.ServerCAFile,
ClientCAFile: cfg.AgentConfig.ClientCAFile,
AttestedTLS: cfg.AgentConfig.AttestedTls,
}
registerAgentServiceServer := func(srv *grpc.Server) {
reflection.Register(srv)
agent.RegisterAgentServiceServer(srv, agentgrpc.NewServer(svc))
}
gs := grpcserver.New(ctx, cancel, svcName, grpcServerConfig, registerAgentServiceServer, logger, &svc)
g.Go(func() error {
return gs.Start()
})
g.Go(func() error {
return server.StopHandler(ctx, cancel, logger, svcName, gs)
})
if err := g.Wait(); err != nil {
logger.Error(fmt.Sprintf("%s service terminated: %s", svcName, err))
}
}
func newService(ctx context.Context, logger *slog.Logger, eventSvc events.Service, cmp agent.Computation) agent.Service {
svc := agent.New(ctx, logger, eventSvc, cmp)
svc = api.LoggingMiddleware(svc, logger)
counter, latency := internal.MakeMetrics(svcName, "api")
svc = api.MetricsMiddleware(svc, counter, latency)
return svc
}
func readConfig() (agent.Computation, error) {
l, err := vsock.Listen(manager.VsockConfigPort, nil)
if err != nil {
return agent.Computation{}, err
}
defer l.Close()
conn, err := l.Accept()
if err != nil {
return agent.Computation{}, err
}
defer conn.Close()
b := make([]byte, 1024)
n, err := conn.Read(b)
if err != nil {
return agent.Computation{}, err
}
ac := agent.Computation{
AgentConfig: agent.AgentConfig{},
}
if err := json.Unmarshal(b[:n], &ac); err != nil {
return agent.Computation{}, err
}
if ac.AgentConfig.LogLevel == "" {
ac.AgentConfig.LogLevel = "info"
}
if ac.AgentConfig.Port == "" {
ac.AgentConfig.Port = defSvcGRPCPort
}
return ac, nil
}