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pre_clone.go
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pre_clone.go
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package client
import (
"context"
"fmt"
"sync"
p4_v1 "github.com/p4lang/p4runtime/go/p4/v1"
)
var (
cloneSessionWildcardReadChSize = 100
)
func (c *Client) InsertCloneSession(ctx context.Context, session_id uint32, packet_length int32, ports []uint32) error {
entry := &p4_v1.CloneSessionEntry{
SessionId: session_id,
PacketLengthBytes: packet_length,
}
for idx, port := range ports {
replica := &p4_v1.Replica{
EgressPort: port,
Instance: uint32(idx),
}
entry.Replicas = append(entry.Replicas, replica)
}
preEntry := &p4_v1.PacketReplicationEngineEntry{
Type: &p4_v1.PacketReplicationEngineEntry_CloneSessionEntry{
CloneSessionEntry: entry,
},
}
updateType := p4_v1.Update_INSERT
update := &p4_v1.Update{
Type: updateType,
Entity: &p4_v1.Entity{
Entity: &p4_v1.Entity_PacketReplicationEngineEntry{
PacketReplicationEngineEntry: preEntry,
},
},
}
return c.WriteUpdate(ctx, update)
}
// modify multicast group
func (c *Client) ModifyCloneSession(ctx context.Context, session_id uint32, packet_length int32, ports []uint32) error {
entry := &p4_v1.CloneSessionEntry{
SessionId: session_id,
PacketLengthBytes: packet_length,
}
for idx, port := range ports {
replica := &p4_v1.Replica{
EgressPort: port,
Instance: uint32(idx),
}
entry.Replicas = append(entry.Replicas, replica)
}
preEntry := &p4_v1.PacketReplicationEngineEntry{
Type: &p4_v1.PacketReplicationEngineEntry_CloneSessionEntry{
CloneSessionEntry: entry,
},
}
updateType := p4_v1.Update_MODIFY
update := &p4_v1.Update{
Type: updateType,
Entity: &p4_v1.Entity{
Entity: &p4_v1.Entity_PacketReplicationEngineEntry{
PacketReplicationEngineEntry: preEntry,
},
},
}
return c.WriteUpdate(ctx, update)
}
func (c *Client) DeleteCloneSession(ctx context.Context, session_id uint32) error {
entry := &p4_v1.CloneSessionEntry{
SessionId: session_id,
}
preEntry := &p4_v1.PacketReplicationEngineEntry{
Type: &p4_v1.PacketReplicationEngineEntry_CloneSessionEntry{
CloneSessionEntry: entry,
},
}
updateType := p4_v1.Update_DELETE
update := &p4_v1.Update{
Type: updateType,
Entity: &p4_v1.Entity{
Entity: &p4_v1.Entity_PacketReplicationEngineEntry{
PacketReplicationEngineEntry: preEntry,
},
},
}
return c.WriteUpdate(ctx, update)
}
// read all clone session entry
func (c *Client) ReadCloneSessionWildcard(ctx context.Context) ([]*p4_v1.CloneSessionEntry, error) {
entry := &p4_v1.PacketReplicationEngineEntry{
Type: &p4_v1.PacketReplicationEngineEntry_CloneSessionEntry{},
}
out := make([]*p4_v1.CloneSessionEntry, 0)
readEntityCh := make(chan *p4_v1.Entity, cloneSessionWildcardReadChSize)
var wg sync.WaitGroup
var err error
wg.Add(1)
go func() {
defer wg.Done()
for readEntity := range readEntityCh {
readEntry := readEntity.GetPacketReplicationEngineEntry()
if readEntry != nil {
out = append(out, readEntry.GetCloneSessionEntry())
} else if err == nil {
// only set the error if this is the first error we encounter
// dp not stop reading from the channel, as doing so would cause
// ReadEntityWildcard to block indefinitely
err = fmt.Errorf("server returned an entity which is not a mutlicastgroup entry!")
}
}
}()
if err := c.ReadEntityWildcard(ctx, &p4_v1.Entity{
Entity: &p4_v1.Entity_PacketReplicationEngineEntry{
PacketReplicationEngineEntry: entry,
},
}, readEntityCh); err != nil {
// 原样返回err,以便后续可以以GRPC的错误进行处理
// return nil, fmt.Errorf("error when reading table entries: %v", err)
return nil, err
}
wg.Wait()
if err != nil {
return nil, err
}
return out, nil
}
// read one clone session entry
func (c *Client) ReadCloneSession(ctx context.Context, session_id uint32) (*p4_v1.CloneSessionEntry, error) {
entry := &p4_v1.PacketReplicationEngineEntry{
Type: &p4_v1.PacketReplicationEngineEntry_CloneSessionEntry{
CloneSessionEntry: &p4_v1.CloneSessionEntry{
SessionId: session_id,
},
},
}
entity := &p4_v1.Entity{
Entity: &p4_v1.Entity_PacketReplicationEngineEntry{PacketReplicationEngineEntry: entry},
}
readEntity, err := c.ReadEntitySingle(ctx, entity)
if err != nil {
// 原样返回err,以便后续可以以GRPC的错误进行处理
// return nil, fmt.Errorf("error when reading multicast group entry: %v", err)
return nil, err
}
readEntry := readEntity.GetPacketReplicationEngineEntry()
if readEntry == nil {
return nil, fmt.Errorf("server returned an entity but it is not a multicast group entry! ")
}
return readEntry.GetCloneSessionEntry(), nil
}