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host_client.go
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276 lines (253 loc) · 5.79 KB
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package zongzi
import (
"context"
"io"
"sync"
"time"
"github.com/benbjohnson/clock"
"google.golang.org/grpc"
"github.com/logbn/zongzi/internal"
)
type hostClient struct {
agent *Agent
clock clock.Clock
host Host
}
func newhostClient(a *Agent, host Host) hostClient {
return hostClient{
agent: a,
clock: clock.New(),
host: host,
}
}
func (c *hostClient) Ping(ctx context.Context) (t time.Duration, err error) {
if c.host.ID == c.agent.hostID() {
return
}
start := c.clock.Now()
_, err = c.agent.grpcClientPool.get(c.host.ApiAddress).Ping(ctx, &internal.PingRequest{})
t = c.clock.Since(start)
return
}
func (c *hostClient) ReadIndex(ctx context.Context, shardID uint64) (err error) {
if c.host.ID == c.agent.hostID() {
return
}
_, err = c.agent.grpcClientPool.get(c.host.ApiAddress).Index(ctx, &internal.IndexRequest{ShardId: shardID})
return
}
func (c *hostClient) Apply(ctx context.Context, shardID uint64, cmd []byte) (value uint64, data []byte, err error) {
var req = &internal.ApplyRequest{
ShardId: shardID,
Data: cmd,
}
var res *internal.ApplyResponse
if c.host.ID == c.agent.hostID() {
res, err = c.agent.grpcServer.Apply(ctx, req)
} else {
res, err = c.agent.grpcClientPool.get(c.host.ApiAddress).Apply(ctx, req)
}
if err != nil {
return
}
value = res.Value
data = res.Data
return
}
func (c *hostClient) Commit(ctx context.Context, shardID uint64, cmd []byte) (err error) {
var req = &internal.CommitRequest{
ShardId: shardID,
Data: cmd,
}
if c.host.ID == c.agent.hostID() {
_, err = c.agent.grpcServer.Commit(ctx, req)
} else {
_, err = c.agent.grpcClientPool.get(c.host.ApiAddress).Commit(ctx, req)
}
return
}
func (c *hostClient) Read(ctx context.Context, shardID uint64, query []byte, stale bool) (value uint64, data []byte, err error) {
var req = &internal.ReadRequest{
ShardId: shardID,
Stale: stale,
Data: query,
}
var res *internal.ReadResponse
if c.host.ID == c.agent.hostID() {
res, err = c.agent.grpcServer.Read(ctx, req)
} else {
res, err = c.agent.grpcClientPool.get(c.host.ApiAddress).Read(ctx, req)
}
if err != nil {
return
}
value = res.Value
data = res.Data
return
}
type watchServer struct {
grpc.ServerStream
ctx context.Context
results chan<- *Result
}
func newWatchServer(ctx context.Context, results chan<- *Result) *watchServer {
return &watchServer{
ctx: ctx,
results: results,
}
}
func (s *watchServer) Context() context.Context {
return s.ctx
}
func (s *watchServer) Send(res *internal.WatchResponse) error {
s.results <- &Result{
Value: res.Value,
Data: res.Data,
}
return nil
}
func (c *hostClient) Watch(ctx context.Context, shardID uint64, query []byte, results chan<- *Result, stale bool) (err error) {
var req = &internal.WatchRequest{
ShardId: shardID,
Stale: stale,
Data: query,
}
var client internal.Internal_WatchClient
if c.host.ID == c.agent.hostID() {
err = c.agent.grpcServer.Watch(req, newWatchServer(ctx, results))
} else {
client, err = c.agent.grpcClientPool.get(c.host.ApiAddress).Watch(ctx, req)
for {
res, err := client.Recv()
if err != nil {
break
}
results <- &Result{
Value: res.Value,
Data: res.Data,
}
}
}
if err != nil {
return
}
return
}
type streamServer struct {
grpc.BidiStreamingServer[internal.StreamRequest, internal.StreamResponse]
ctx context.Context
in <-chan []byte
init bool
out chan<- *Result
shardID uint64
stale bool
}
func newStreamServer(ctx context.Context, shardID uint64, in <-chan []byte, out chan<- *Result, stale bool) *streamServer {
return &streamServer{
ctx: ctx,
in: in,
out: out,
shardID: shardID,
stale: stale,
}
}
func (s *streamServer) Context() context.Context {
return s.ctx
}
func (s *streamServer) Recv() (req *internal.StreamRequest, err error) {
if !s.init {
req = &internal.StreamRequest{
RequestUnion: &internal.StreamRequest_StreamConnect{
StreamConnect: &internal.StreamConnect{
ShardId: s.shardID,
Stale: s.stale,
},
},
}
s.init = true
} else {
select {
case data := <-s.in:
req = &internal.StreamRequest{
RequestUnion: &internal.StreamRequest_StreamMessage{
StreamMessage: &internal.StreamMessage{
ShardId: s.shardID,
Data: data,
},
},
}
case <-s.ctx.Done():
err = io.EOF
return
}
}
return
}
func (s *streamServer) Send(res *internal.StreamResponse) error {
s.out <- &Result{
Value: res.Value,
Data: res.Data,
}
return nil
}
func (c *hostClient) Stream(ctx context.Context, shardID uint64, in <-chan []byte, out chan<- *Result, stale bool) (err error) {
var wg sync.WaitGroup
var client internal.Internal_StreamClient
var done = make(chan bool)
if c.host.ID == c.agent.hostID() {
err = c.agent.grpcServer.Stream(newStreamServer(ctx, shardID, in, out, stale))
} else {
client, err = c.agent.grpcClientPool.get(c.host.ApiAddress).Stream(ctx)
wg.Go(func() {
err = client.Send(&internal.StreamRequest{
RequestUnion: &internal.StreamRequest_StreamConnect{
StreamConnect: &internal.StreamConnect{
ShardId: shardID,
Stale: stale,
},
},
})
if err != nil {
return
}
for {
select {
case data := <-in:
err := client.Send(&internal.StreamRequest{
RequestUnion: &internal.StreamRequest_StreamMessage{
StreamMessage: &internal.StreamMessage{
ShardId: shardID,
Data: data,
},
},
})
if err != nil {
panic(err)
}
case <-done:
return
}
}
})
wg.Go(func() {
for {
res, err := client.Recv()
if err != nil {
if err == io.EOF {
close(done)
}
return
}
out <- &Result{
Value: res.Value,
Data: res.Data,
}
}
})
wg.Wait()
}
if err != nil {
return
}
return
}