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server_client.go
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server_client.go
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package copper
import (
"fmt"
"net"
)
type serverClient struct {
owner *server
conn RawConn
failure error
allowChanges bool
subscriptions map[int64]*serverSubscription
published map[int64]*localEndpoint
pubWatchers map[*serverServiceChangesStream]struct{}
}
var _ lowLevelServer = &serverClient{}
func newServerClient(s *server, conn net.Conn, allowChanges bool) *serverClient {
c := &serverClient{
owner: s,
allowChanges: allowChanges,
subscriptions: make(map[int64]*serverSubscription),
published: make(map[int64]*localEndpoint),
pubWatchers: make(map[*serverServiceChangesStream]struct{}),
}
c.conn = NewRawConn(conn, c, true)
s.clientwg.Add(1)
go c.serve()
return c
}
func (c *serverClient) handleRequestRLockedWith(client Stream, endpoint endpointReference) error {
for {
status := endpoint.handleRequestRLocked(func(remote Stream) handleRequestStatus {
passthruBoth(client, remote)
return handleRequestStatusDone
}, client.Closed())
switch status {
case handleRequestStatusDone:
return nil
case handleRequestStatusRetry:
// an attempt failed early and may be retried
continue
case handleRequestStatusNoRoute:
// request failed or couldn't be routed
return ENOROUTE
case handleRequestStatusOverCapacity:
// there is not enough capacity to handle the request
return EOVERCAPACITY
default:
return fmt.Errorf("unhandled request status: %d", status)
}
}
}
func (c *serverClient) ServeCopper(stream Stream) error {
return rpcWrapServer(stream, c)
}
func (c *serverClient) closeWithErrorLocked(err error) {
if c.failure == nil {
c.failure = err
c.conn.Close()
for targetID, sub := range c.subscriptions {
delete(c.subscriptions, targetID)
sub.unsubscribeLocked()
}
for targetID, endpoint := range c.published {
delete(c.published, targetID)
endpoint.unpublishLocked()
}
for cs := range c.pubWatchers {
cs.stopLocked()
}
}
}
func (c *serverClient) serve() {
defer c.owner.clientwg.Done()
<-c.conn.Done()
err := c.conn.Err()
c.owner.mu.Lock()
defer c.owner.mu.Unlock()
delete(c.owner.clients, c)
c.closeWithErrorLocked(err)
}
func (c *serverClient) handleNewStream(targetID int64, stream Stream) error {
c.owner.mu.RLock()
defer c.owner.mu.RUnlock()
if c.failure != nil {
return c.failure
}
if sub := c.subscriptions[targetID]; sub != nil {
// This is a subscription
return c.handleRequestRLockedWith(stream, sub)
}
if pub := c.owner.pubByTarget[targetID]; pub != nil {
// This is a direct connection
return c.handleRequestRLockedWith(stream, pub)
}
return ENOTARGET
}
func (c *serverClient) subscribe(settings SubscribeSettings) (int64, error) {
c.owner.mu.Lock()
defer c.owner.mu.Unlock()
if c.failure != nil {
return 0, c.failure
}
sub, err := c.owner.subscribeLocked(settings)
if err != nil {
return 0, err
}
c.subscriptions[sub.targetID] = sub
return sub.targetID, nil
}
func (c *serverClient) getEndpoints(targetID int64) ([]Endpoint, error) {
c.owner.mu.RLock()
defer c.owner.mu.RUnlock()
if c.failure != nil {
return nil, c.failure
}
sub := c.subscriptions[targetID]
if sub == nil {
return nil, fmt.Errorf("target %d is not subscribed", targetID)
}
return sub.getEndpointsRLocked(), nil
}
func (c *serverClient) streamEndpoints(targetID int64) (EndpointChangesStream, error) {
return nil, EUNSUPPORTED
}
func (c *serverClient) unsubscribe(targetID int64) error {
c.owner.mu.Lock()
defer c.owner.mu.Unlock()
if c.failure != nil {
return c.failure
}
sub := c.subscriptions[targetID]
if sub == nil {
return fmt.Errorf("target %d is not subscribed", targetID)
}
delete(c.subscriptions, targetID)
sub.unsubscribeLocked()
return nil
}
func (c *serverClient) publish(targetID int64, name string, settings PublishSettings) error {
c.owner.mu.Lock()
defer c.owner.mu.Unlock()
if c.failure != nil {
return c.failure
}
if !c.allowChanges {
return fmt.Errorf("publishing is not allowed")
}
if old := c.published[targetID]; old != nil && old.pub != nil {
return fmt.Errorf("target %d is already published as %q", targetID, old.pub.name)
}
if settings.Concurrency == 0 {
return fmt.Errorf("publishing with concurrency=0 is not alloswed")
}
key := localEndpointKey{
client: c,
targetID: targetID,
}
endpoint, err := c.owner.publishLocked(name, key, settings)
if err != nil {
return fmt.Errorf("target %d cannot be published: %s", targetID, err)
}
c.published[targetID] = endpoint
return nil
}
func (c *serverClient) unpublish(targetID int64) error {
c.owner.mu.Lock()
defer c.owner.mu.Unlock()
if c.failure != nil {
return c.failure
}
endpoint := c.published[targetID]
if endpoint == nil {
return fmt.Errorf("target %d is not published", targetID)
}
delete(c.published, targetID)
err := endpoint.unpublishLocked()
if err != nil {
return fmt.Errorf("target %d cannot be unpublished: %s", targetID, err)
}
delete(c.published, targetID)
return nil
}
func (c *serverClient) setRoute(name string, routes ...Route) error {
c.owner.mu.Lock()
defer c.owner.mu.Unlock()
if c.failure != nil {
return c.failure
}
if !c.allowChanges {
return fmt.Errorf("setting routes is not allowed")
}
return c.owner.setRouteLocked(name, routes)
}
func (c *serverClient) listRoutes() ([]string, error) {
c.owner.mu.RLock()
defer c.owner.mu.RUnlock()
if c.failure != nil {
return nil, c.failure
}
names := make([]string, 0, len(c.owner.routeByName))
for name := range c.owner.routeByName {
names = append(names, name)
}
return names, nil
}
func (c *serverClient) lookupRoute(name string) ([]Route, error) {
c.owner.mu.RLock()
defer c.owner.mu.RUnlock()
if c.failure != nil {
return nil, c.failure
}
if r := c.owner.routeByName[name]; r != nil {
return r.routes, nil
}
return nil, nil
}
func (c *serverClient) streamServices() (ServiceChangesStream, error) {
c.owner.mu.Lock()
defer c.owner.mu.Unlock()
if c.failure != nil {
return nil, c.failure
}
cs := newServerServiceChangesStream(c.owner, c)
return cs, nil
}