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Some rename and prep for puts

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This commit is contained in:
Chad Retz 2019-02-22 15:40:55 -06:00
parent a1c1ff95ff
commit 578e8917ae
4 changed files with 89 additions and 56 deletions
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11
gun/gun.go
View File

@ -14,6 +14,7 @@ type Gun struct {
peerErrorHandler func(*ErrPeer)
peerSleepOnError time.Duration
myPeerID string
tracking Tracking
messageIDPutListeners map[string]chan<- *MessageReceived
messageIDPutListenersLock sync.RWMutex
@ -26,8 +27,17 @@ type Config struct {
PeerErrorHandler func(*ErrPeer)
PeerSleepOnError time.Duration
MyPeerID string
Tracking Tracking
}
type Tracking int
const (
TrackingRequested Tracking = iota
TrackingNothing
TrackingEverything
)
const DefaultPeerSleepOnError = 30 * time.Second
func New(ctx context.Context, config Config) (*Gun, error) {
@ -38,6 +48,7 @@ func New(ctx context.Context, config Config) (*Gun, error) {
peerErrorHandler: config.PeerErrorHandler,
peerSleepOnError: config.PeerSleepOnError,
myPeerID: config.MyPeerID,
tracking: config.Tracking,
messageIDPutListeners: map[string]chan<- *MessageReceived{},
}
// Create all the peers

117
gun/scoped.go
View File

@ -14,31 +14,33 @@ type Scoped struct {
cachedParentSoul string
cachedParentSoulLock sync.RWMutex
valueChansToListeners map[<-chan *ValueFetch]*messageIDListener
valueChansToListenersLock sync.Mutex
resultChansToListeners map[<-chan *Result]*messageIDListener
resultChansToListenersLock sync.Mutex
}
type messageIDListener struct {
id string
values chan *ValueFetch
results chan *Result
receivedMessages chan *MessageReceived
}
func newScoped(gun *Gun, parent *Scoped, field string) *Scoped {
return &Scoped{
gun: gun,
parent: parent,
field: field,
valueChansToListeners: map[<-chan *ValueFetch]*messageIDListener{},
gun: gun,
parent: parent,
field: field,
resultChansToListeners: map[<-chan *Result]*messageIDListener{},
}
}
type ValueFetch struct {
type Result struct {
// This can be a context error on cancelation
Err error
Field string
// Nil if the value doesn't exist or there's an error
Value *ValueWithState
// Nil if the value doesn't exist, exists and is nil, or there's an error
Value Value
State int64 // This can be 0 for errors or top-level value relations
ValueExists bool
// Nil when local and sometimes on error
peer *gunPeer
}
@ -53,11 +55,11 @@ func (s *Scoped) Soul(ctx context.Context) (string, error) {
s.cachedParentSoulLock.RUnlock()
if cachedParentSoul != "" {
return cachedParentSoul, nil
} else if v := s.Val(ctx); v.Err != nil {
return "", v.Err
} else if v.Value == nil {
} else if r := s.Val(ctx); r.Err != nil {
return "", r.Err
} else if !r.ValueExists {
return "", nil
} else if rel, ok := v.Value.Value.(ValueRelation); !ok {
} else if rel, ok := r.Value.(ValueRelation); !ok {
return "", ErrNotObject
} else {
s.cachedParentSoulLock.Lock()
@ -67,70 +69,79 @@ func (s *Scoped) Soul(ctx context.Context) (string, error) {
}
}
func (s *Scoped) Val(ctx context.Context) *ValueFetch {
func (s *Scoped) Put(ctx context.Context, val Value) <-chan *Result {
panic("TODO")
}
func (s *Scoped) Val(ctx context.Context) *Result {
// Try local before remote
if v := s.ValLocal(ctx); v != nil {
return v
if r := s.ValLocal(ctx); r.Err != nil || r.ValueExists {
return r
}
return s.ValRemote(ctx)
}
func (s *Scoped) ValLocal(ctx context.Context) *ValueFetch {
func (s *Scoped) ValLocal(ctx context.Context) *Result {
// If there is no parent, this is just the relation
if s.parent == nil {
return &ValueFetch{Field: s.field, Value: &ValueWithState{Value: ValueRelation(s.field)}}
return &Result{Field: s.field, Value: ValueRelation(s.field), ValueExists: true}
}
v := &ValueFetch{Field: s.field}
r := &Result{Field: s.field}
// Need parent soul for lookup
var parentSoul string
if parentSoul, v.Err = s.parent.Soul(ctx); v.Err == nil {
if v.Value, v.Err = s.gun.storage.Get(ctx, parentSoul, s.field); v.Err == ErrStorageNotFound {
return nil
if parentSoul, r.Err = s.parent.Soul(ctx); r.Err == nil {
var vs *ValueWithState
if vs, r.Err = s.gun.storage.Get(ctx, parentSoul, s.field); r.Err == ErrStorageNotFound {
r.Err = nil
} else if r.Err == nil {
r.Value, r.State, r.ValueExists = vs.Value, vs.State, true
}
}
return v
return r
}
func (s *Scoped) ValRemote(ctx context.Context) *ValueFetch {
func (s *Scoped) ValRemote(ctx context.Context) *Result {
if s.parent == nil {
return &ValueFetch{Err: ErrLookupOnTopLevel, Field: s.field}
return &Result{Err: ErrLookupOnTopLevel, Field: s.field}
}
ch := s.OnRemote(ctx)
defer s.Off(ch)
return <-ch
}
func (s *Scoped) On(ctx context.Context) <-chan *ValueFetch {
ch := make(chan *ValueFetch, 1)
func (s *Scoped) On(ctx context.Context) <-chan *Result {
ch := make(chan *Result, 1)
if s.parent == nil {
ch <- &ValueFetch{Err: ErrLookupOnTopLevel, Field: s.field}
ch <- &Result{Err: ErrLookupOnTopLevel, Field: s.field}
close(ch)
} else {
if v := s.ValLocal(ctx); v != nil {
ch <- v
if r := s.ValLocal(ctx); r.Err != nil || r.ValueExists {
ch <- r
}
go s.onRemote(ctx, ch)
}
return ch
}
func (s *Scoped) OnRemote(ctx context.Context) <-chan *ValueFetch {
ch := make(chan *ValueFetch, 1)
func (s *Scoped) OnRemote(ctx context.Context) <-chan *Result {
ch := make(chan *Result, 1)
if s.parent == nil {
ch <- &ValueFetch{Err: ErrLookupOnTopLevel, Field: s.field}
ch <- &Result{Err: ErrLookupOnTopLevel, Field: s.field}
close(ch)
} else {
go s.onRemote(ctx, ch)
}
return ch
}
func (s *Scoped) onRemote(ctx context.Context, ch chan *ValueFetch) {
func (s *Scoped) onRemote(ctx context.Context, ch chan *Result) {
if s.parent == nil {
panic("No parent")
}
// We have to get the parent soul first
parentSoul, err := s.parent.Soul(ctx)
if err != nil {
ch <- &ValueFetch{Err: ErrLookupOnTopLevel, Field: s.field}
ch <- &Result{Err: ErrLookupOnTopLevel, Field: s.field}
return
}
// Create get request
@ -142,9 +153,9 @@ func (s *Scoped) onRemote(ctx context.Context, ch chan *ValueFetch) {
// the given one so we can turn it "off". Off will close this
// chan.
msgCh := make(chan *MessageReceived)
s.valueChansToListenersLock.Lock()
s.valueChansToListeners[ch] = &messageIDListener{req.ID, ch, msgCh}
s.valueChansToListenersLock.Unlock()
s.resultChansToListenersLock.Lock()
s.resultChansToListeners[ch] = &messageIDListener{req.ID, ch, msgCh}
s.resultChansToListenersLock.Unlock()
// Listen for responses to this get
s.gun.RegisterMessageIDPutListener(req.ID, msgCh)
// TODO: only for children: s.gun.RegisterValueIDPutListener(s.id, msgCh)
@ -153,29 +164,29 @@ func (s *Scoped) onRemote(ctx context.Context, ch chan *ValueFetch) {
for {
select {
case <-ctx.Done():
ch <- &ValueFetch{Err: ctx.Err(), Field: s.field}
ch <- &Result{Err: ctx.Err(), Field: s.field}
s.Off(ch)
return
case msg, ok := <-msgCh:
if !ok {
return
}
f := &ValueFetch{Field: s.field, peer: msg.peer}
r := &Result{Field: s.field, peer: msg.peer}
// We asked for a single field, should only get that field or it doesn't exist
if n := msg.Put[parentSoul]; n != nil && n.Values[s.field] != nil {
f.Value = &ValueWithState{n.Values[s.field], n.State[s.field]}
r.Value, r.State, r.ValueExists = n.Values[s.field], n.State[s.field], true
}
// TODO: conflict resolution and defer
// TODO: dedupe
// TODO: store and cache
safeValueFetchSend(ch, f)
safeResultSend(ch, r)
}
}
}()
// Send async, sending back errors
go func() {
for peerErr := range s.gun.Send(ctx, req) {
safeValueFetchSend(ch, &ValueFetch{
safeResultSend(ch, &Result{
Err: peerErr.Err,
Field: s.field,
peer: peerErr.peer,
@ -184,17 +195,17 @@ func (s *Scoped) onRemote(ctx context.Context, ch chan *ValueFetch) {
}()
}
func (s *Scoped) Off(ch <-chan *ValueFetch) bool {
s.valueChansToListenersLock.Lock()
l := s.valueChansToListeners[ch]
delete(s.valueChansToListeners, ch)
s.valueChansToListenersLock.Unlock()
func (s *Scoped) Off(ch <-chan *Result) bool {
s.resultChansToListenersLock.Lock()
l := s.resultChansToListeners[ch]
delete(s.resultChansToListeners, ch)
s.resultChansToListenersLock.Unlock()
if l != nil {
// Unregister the chan
s.gun.UnregisterMessageIDPutListener(l.id)
// Close the message chan and the value chan
// Close the message chan and the result chan
close(l.receivedMessages)
close(l.values)
close(l.results)
}
return l != nil
}
@ -207,8 +218,8 @@ func (s *Scoped) Scoped(ctx context.Context, key string, children ...string) *Sc
return ret
}
func safeValueFetchSend(ch chan<- *ValueFetch, f *ValueFetch) {
func safeResultSend(ch chan<- *Result, r *Result) {
// Due to the fact that we may send on a closed channel here, we ignore the panic
defer func() { recover() }()
ch <- f
ch <- r
}

7
gun/storage.go
View File

@ -11,7 +11,7 @@ var ErrStorageNotFound = errors.New("Not found")
type Storage interface {
Get(ctx context.Context, parentSoul, field string) (*ValueWithState, error)
Put(ctx context.Context, parentSoul, field string, val *ValueWithState) (bool, error)
// Tracking(ctx context.Context, id string) (bool, error)
Tracking(ctx context.Context, parentSoul, field string) (bool, error)
}
type StorageInMem struct {
@ -33,3 +33,8 @@ func (s *StorageInMem) Put(ctx context.Context, parentSoul, field string, val *V
// TODO: conflict resolution state check?
return true, nil
}
func (s *StorageInMem) Tracking(ctx context.Context, parentSoul, field string) (bool, error) {
_, ok := s.values.Load(parentSoulAndField{parentSoul, field})
return ok, nil
}

10
gun/tests/gun_test.go
View File

@ -24,9 +24,15 @@ func TestGunGetSimple(t *testing.T) {
`)
// Get
g := ctx.newGunConnectedToGunJS()
defer g.Close()
// Make sure we got back the same value
f := g.Scoped(ctx, "esgopeta-test", "TestGunGetSimple", "some-key").Val(ctx)
ctx.Require.NoError(f.Err)
// Make sure we got back the same value
ctx.Require.Equal(gun.ValueString(randStr), f.Value.Value.(gun.ValueString))
ctx.Require.Equal(gun.ValueString(randStr), f.Value.(gun.ValueString))
// // Do it again TODO: make sure there are no network calls, it's all from mem
// ctx.debugf("Asking for key again")
// f = g.Scoped(ctx, "esgopeta-test", "TestGunGetSimple", "some-key").Val(ctx)
// ctx.Require.NoError(f.Err)
// ctx.Require.Equal(gun.ValueString(randStr), f.Value.Value.(gun.ValueString))
}