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host_client.go
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host_client.go
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package zongzi
import (
"context"
"time"
"github.com/benbjohnson/clock"
"google.golang.org/grpc"
"github.com/logbn/zongzi/internal"
)
type HostClient interface {
Ping(ctx context.Context) (t time.Duration, err error)
ReadIndex(ctx context.Context, shardID uint64) (err error)
Apply(ctx context.Context, shardID uint64, cmd []byte) (value uint64, data []byte, err error)
Commit(ctx context.Context, shardID uint64, cmd []byte) (err error)
Read(ctx context.Context, shardID uint64, query []byte, stale bool) (value uint64, data []byte, err error)
Watch(ctx context.Context, shardID uint64, query []byte, results chan<- *Result, stale bool) (err error)
}
type hostclient struct {
agent *Agent
clock clock.Clock
hostApiAddress string
hostID string
}
func newHostClient(a *Agent, host Host) *hostclient {
return &hostclient{
agent: a,
clock: clock.New(),
hostApiAddress: host.ApiAddress,
hostID: host.ID,
}
}
func (c *hostclient) Ping(ctx context.Context) (t time.Duration, err error) {
if c.hostID == c.agent.HostID() {
return
}
start := c.clock.Now()
_, err = c.agent.grpcClientPool.get(c.hostApiAddress).Ping(ctx, &internal.PingRequest{})
t = c.clock.Since(start)
return
}
func (c *hostclient) ReadIndex(ctx context.Context, shardID uint64) (err error) {
if c.hostID == c.agent.HostID() {
return
}
_, err = c.agent.grpcClientPool.get(c.hostApiAddress).ReadIndex(ctx, &internal.ReadIndexRequest{})
return
}
func (c *hostclient) Apply(ctx context.Context, shardID uint64, cmd []byte) (value uint64, data []byte, err error) {
var res *internal.ApplyResponse
if c.hostID == c.agent.HostID() {
c.agent.log.Debugf(`gRPC HostClient Apply Local: %s`, string(cmd))
res, err = c.agent.grpcServer.Apply(ctx, &internal.ApplyRequest{
ShardId: shardID,
Data: cmd,
})
} else {
c.agent.log.Debugf(`gRPC HostClient Apply Remote: %s`, string(cmd))
res, err = c.agent.grpcClientPool.get(c.hostApiAddress).Apply(ctx, &internal.ApplyRequest{
ShardId: shardID,
Data: cmd,
})
}
if err != nil {
return
}
value = res.Value
data = res.Data
return
}
func (c *hostclient) Commit(ctx context.Context, shardID uint64, cmd []byte) (err error) {
if c.hostID == c.agent.HostID() {
c.agent.log.Debugf(`gRPC HostClient Commit Local: %s`, string(cmd))
_, err = c.agent.grpcServer.Commit(ctx, &internal.CommitRequest{
ShardId: shardID,
Data: cmd,
})
} else {
c.agent.log.Debugf(`gRPC HostClient Commit Remote: %s`, string(cmd))
_, err = c.agent.grpcClientPool.get(c.hostApiAddress).Commit(ctx, &internal.CommitRequest{
ShardId: shardID,
Data: cmd,
})
}
if err != nil {
return
}
return
}
func (c *hostclient) Read(ctx context.Context, shardID uint64, query []byte, stale bool) (value uint64, data []byte, err error) {
var res *internal.ReadResponse
if c.hostID == c.agent.HostID() {
res, err = c.agent.grpcServer.Read(ctx, &internal.ReadRequest{
ShardId: shardID,
Stale: stale,
Data: query,
})
} else {
res, err = c.agent.grpcClientPool.get(c.hostApiAddress).Read(ctx, &internal.ReadRequest{
ShardId: shardID,
Stale: stale,
Data: query,
})
}
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 client internal.Internal_WatchClient
if c.hostID == c.agent.HostID() {
err = c.agent.grpcServer.Watch(&internal.WatchRequest{
ShardId: shardID,
Stale: stale,
Data: query,
}, newWatchServer(ctx, results))
} else {
client, err = c.agent.grpcClientPool.get(c.hostApiAddress).Watch(ctx, &internal.WatchRequest{
ShardId: shardID,
Stale: stale,
Data: query,
})
for {
res, err := client.Recv()
if err != nil {
break
}
results <- &Result{
Value: res.Value,
Data: res.Data,
}
}
}
if err != nil {
return
}
return
}