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resources.go
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resources.go
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package rpcserver
import (
"context"
"errors"
"fmt"
"sync"
"github.com/companyzero/bisonrelay/client"
"github.com/companyzero/bisonrelay/client/clientintf"
"github.com/companyzero/bisonrelay/client/resources"
"github.com/companyzero/bisonrelay/clientrpc/types"
"github.com/companyzero/bisonrelay/rpc"
"github.com/decred/slog"
)
type ResourcesServerCfg struct {
Client *client.Client
// Log should be set to the app's logger.
Log slog.Logger
// Router on which to bind the server, to fulfill requests.
Router *resources.Router
}
type resourcesServer struct {
c *client.Client
log slog.Logger
mtx sync.Mutex
nextID uint64
requests map[uint64]chan interface{}
upstream types.ResourcesService_RequestsStreamServer
upstreamFailed chan error
}
// Fulfill attempts to fulfill a request with an upstream clientrpc client.
func (rs *resourcesServer) Fulfill(ctx context.Context, uid clientintf.UserID,
req *rpc.RMFetchResource) (*rpc.RMFetchResourceReply, error) {
user, err := rs.c.UserByID(uid)
if err != nil {
return nil, err
}
// Track this request.
c := make(chan interface{}, 1)
rs.mtx.Lock()
id := rs.nextID
rs.nextID += 1
upstream := rs.upstream
if upstream != nil {
rs.requests[id] = c
}
rs.mtx.Unlock()
// Alert handler.
if upstream == nil {
return nil, fmt.Errorf("no upstream to process resource request")
}
evnt := &types.ResourceRequestsStreamResponse{
Id: id,
Uid: uid[:],
Nick: user.Nick(),
Request: &types.RMFetchResource{
Path: req.Path,
Meta: req.Meta,
Tag: uint64(req.Tag),
Data: req.Data,
Index: req.Index,
Count: req.Count,
},
}
err = upstream.Send(evnt)
if err != nil {
rs.mtx.Lock()
delete(rs.requests, id)
rs.mtx.Unlock()
return nil, fmt.Errorf("unable to send request to upstream: %v", err)
}
// Wait for reply.
select {
case <-ctx.Done():
return nil, ctx.Err()
case res := <-c:
switch res := res.(type) {
case *rpc.RMFetchResourceReply:
return res, nil
case error:
return nil, res
default:
return nil, fmt.Errorf("unknown reply typ in req chan %T", res)
}
}
}
func (rs *resourcesServer) RequestsStream(ctx context.Context, req *types.ResourceRequestsStreamRequest, res types.ResourcesService_RequestsStreamServer) error {
rs.mtx.Lock()
if rs.upstream != nil {
rs.mtx.Unlock()
return fmt.Errorf("already have previous upstream handler")
}
rs.upstream = res
rs.mtx.Unlock()
var err error
select {
case <-ctx.Done():
err = ctx.Err()
case err = <-rs.upstreamFailed:
}
rs.mtx.Lock()
rs.upstream = nil
rs.mtx.Unlock()
return err
}
func (rs *resourcesServer) FulfillRequest(_ context.Context, res *types.FulfillResourceRequest, _ *types.FulfillResourceRequestResponse) error {
rs.mtx.Lock()
c := rs.requests[res.Id]
delete(rs.requests, res.Id)
rs.mtx.Unlock()
if c == nil {
return fmt.Errorf("request with id %d not found", res.Id)
}
if res.ErrorMsg != "" {
return errors.New(res.ErrorMsg)
}
rs.log.Infof("XXXXXXXXXXXXXXX %d", res.Response.Status)
c <- &rpc.RMFetchResourceReply{
Tag: rpc.ResourceTag(res.Response.Tag),
Status: rpc.ResourceStatus(res.Response.Status),
Meta: res.Response.Meta,
Data: res.Response.Data,
Index: res.Response.Index,
Count: res.Response.Count,
}
return nil
}
var _ types.ResourcesServiceServer = (*resourcesServer)(nil)
func (s *Server) InitResourcesService(cfg ResourcesServerCfg) error {
log := slog.Disabled
if cfg.Log != nil {
log = cfg.Log
}
rs := &resourcesServer{
c: cfg.Client,
log: log,
requests: make(map[uint64]chan interface{}),
nextID: 1,
}
if cfg.Router != nil {
cfg.Router.BindPrefixPath([]string{}, rs)
}
s.services.Bind("ResourcesService", types.ResourcesServiceDefn(), rs)
return nil
}