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mdb_service.go
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mdb_service.go
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package remote
import (
"context"
"net"
"strconv"
"sync"
"time"
"github.com/evergreen-ci/lru"
"github.com/evergreen-ci/mrpc"
"github.com/evergreen-ci/mrpc/mongowire"
"github.com/evergreen-ci/mrpc/shell"
"github.com/mongodb/grip"
"github.com/mongodb/grip/message"
"github.com/mongodb/grip/recovery"
"github.com/mongodb/jasper"
"github.com/mongodb/jasper/options"
"github.com/mongodb/jasper/util"
"github.com/pkg/errors"
)
type mdbService struct {
mrpc.Service
manager jasper.Manager
cache *lru.Cache
cacheOpts options.Cache
cacheMutex sync.RWMutex
}
// StartMDBService wraps an existing Jasper manager in a MongoDB wire protocol
// service and starts it. The caller is responsible for closing the connection
// using the returned jasper.CloseFunc.
func StartMDBService(ctx context.Context, m jasper.Manager, addr net.Addr) (util.CloseFunc, error) {
host, p, err := net.SplitHostPort(addr.String())
if err != nil {
return nil, errors.Wrapf(err, "invalid address '%s'", addr)
}
port, err := strconv.Atoi(p)
if err != nil {
return nil, errors.Wrap(err, "port is not a number")
}
baseSvc, err := shell.NewShellService(host, port)
if err != nil {
return nil, errors.Wrap(err, "creating base service")
}
svc := &mdbService{
Service: baseSvc,
manager: m,
cache: lru.NewCache(),
cacheOpts: options.Cache{
PruneDelay: jasper.DefaultCachePruneDelay,
MaxSize: jasper.DefaultMaxCacheSize,
},
}
if err := svc.registerHandlers(); err != nil {
return nil, errors.Wrap(err, "registering handlers")
}
cctx, ccancel := context.WithCancel(context.Background())
go func() {
defer func() {
grip.Error(recovery.HandlePanicWithError(recover(), nil, "running wire service"))
}()
grip.Notice(svc.Run(cctx))
}()
go svc.pruneCache(cctx)
return func() error { ccancel(); return nil }, nil
}
func (s *mdbService) registerHandlers() error {
for name, handler := range map[string]mrpc.HandlerFunc{
// jasper.Manager commands
ManagerIDCommand: s.managerID,
CreateProcessCommand: s.managerCreateProcess,
ListCommand: s.managerList,
GroupCommand: s.managerGroup,
GetProcessCommand: s.managerGetProcess,
ClearCommand: s.managerClear,
CloseCommand: s.managerClose,
WriteFileCommand: s.managerWriteFile,
// jasper.Process commands
InfoCommand: s.processInfo,
RunningCommand: s.processRunning,
CompleteCommand: s.processComplete,
WaitCommand: s.processWait,
SignalCommand: s.processSignal,
RegisterSignalTriggerIDCommand: s.processRegisterSignalTriggerID,
RespawnCommand: s.processRespawn,
TagCommand: s.processTag,
GetTagsCommand: s.processGetTags,
ResetTagsCommand: s.processResetTags,
// Manager commands
ConfigureCacheCommand: s.configureCache,
DownloadFileCommand: s.downloadFile,
DownloadMongoDBCommand: s.downloadMongoDB,
GetLogStreamCommand: s.getLogStream,
GetBuildloggerURLsCommand: s.getBuildloggerURLs,
SignalEventCommand: s.signalEvent,
SendMessagesCommand: s.sendMessages,
// jasper.LoggingCache commands
LoggingCacheCreateCommand: s.loggingCacheCreate,
LoggingCacheGetCommand: s.loggingCacheGet,
LoggingCacheRemoveCommand: s.loggingCacheRemove,
LoggingCacheCloseAndRemoveCommand: s.loggingCacheCloseAndRemove,
LoggingCacheClearCommand: s.loggingCacheClear,
LoggingCachePruneCommand: s.loggingCachePrune,
LoggingCacheLenCommand: s.loggingCacheLen,
} {
if err := s.RegisterOperation(&mongowire.OpScope{
Type: mongowire.OP_COMMAND,
Command: name,
}, handler); err != nil {
return errors.Wrapf(err, "registering handler for command '%s'", name)
}
}
return nil
}
func (s *mdbService) pruneCache(ctx context.Context) {
defer func() {
err := recovery.HandlePanicWithError(recover(), nil, "pruning cache")
if ctx.Err() != nil || err == nil {
return
}
go s.pruneCache(ctx)
}()
s.cacheMutex.RLock()
timer := time.NewTimer(s.cacheOpts.PruneDelay)
s.cacheMutex.RUnlock()
for {
select {
case <-timer.C:
s.cacheMutex.RLock()
if !s.cacheOpts.Disabled {
grip.Error(message.WrapError(s.cache.Prune(s.cacheOpts.MaxSize, nil, false), "pruning cache"))
}
timer.Reset(s.cacheOpts.PruneDelay)
s.cacheMutex.RUnlock()
case <-ctx.Done():
return
}
}
}