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block.go
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block.go
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package model
import (
"bytes"
"context"
"encoding/json"
"net"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/clientv3/clientv3util"
"github.com/cybozu-go/coil"
"github.com/cybozu-go/log"
)
func (m etcdModel) GetMyBlocks(ctx context.Context, node string) (map[string][]*net.IPNet, error) {
resp, err := m.etcd.Get(ctx, keyBlock, clientv3.WithPrefix())
if err != nil {
return nil, err
}
ret := make(map[string][]*net.IPNet)
for _, kv := range resp.Kvs {
ba := new(coil.BlockAssignment)
err = json.Unmarshal(kv.Value, ba)
if err != nil {
return nil, err
}
blocks := ba.Nodes[node]
if len(blocks) > 0 {
t := kv.Key[len(keyBlock):]
poolName := string(t[0:bytes.IndexByte(t, '/')])
ret[poolName] = append(ret[poolName], blocks...)
}
}
return ret, nil
}
func (m etcdModel) GetAssignedBlocks(ctx context.Context) (map[string][]*net.IPNet, error) {
resp, err := m.etcd.Get(ctx, keyBlock, clientv3.WithPrefix())
if err != nil {
return nil, err
}
ret := make(map[string][]*net.IPNet)
for _, kv := range resp.Kvs {
ba := new(coil.BlockAssignment)
err = json.Unmarshal(kv.Value, ba)
if err != nil {
return nil, err
}
t := kv.Key[len(keyBlock):]
poolName := string(t[0:bytes.IndexByte(t, '/')])
for _, blocks := range ba.Nodes {
ret[poolName] = append(ret[poolName], blocks...)
}
}
return ret, nil
}
func (m etcdModel) AcquireBlock(ctx context.Context, node, poolName string) (*net.IPNet, error) {
bkeyPrefix := blockKeyPrefix(poolName)
RETRY:
gresp, err := m.etcd.Get(ctx, bkeyPrefix, clientv3.WithPrefix())
if err != nil {
return nil, err
}
if gresp.Count == 0 {
return nil, ErrNotFound
}
var ba coil.BlockAssignment
var bkey string
var rev int64
for _, kv := range gresp.Kvs {
var b coil.BlockAssignment
err = json.Unmarshal(kv.Value, &b)
if err != nil {
return nil, err
}
if len(b.FreeList) != 0 {
ba = b
bkey = string(kv.Key)
rev = kv.ModRevision
break
}
}
if len(bkey) == 0 {
return nil, ErrOutOfBlocks
}
first := ba.FreeList[0]
rest := ba.FreeList[1:]
ba.Nodes[node] = append(ba.Nodes[node], first)
ba.FreeList = rest
output, err := json.Marshal(ba)
if err != nil {
return nil, err
}
tresp, err := m.etcd.Txn(ctx).
If(clientv3.Compare(clientv3.ModRevision(bkey), "=", rev)).
Then(clientv3.OpPut(bkey, string(output))).
Commit()
if err != nil {
return nil, err
}
if !tresp.Succeeded {
goto RETRY
}
return first, nil
}
func (m etcdModel) ReleaseBlock(ctx context.Context, node, poolName string, block *net.IPNet, force bool) error {
pool, err := m.GetPool(ctx, poolName)
if err != nil {
return err
}
var subnet *net.IPNet
for _, sn := range pool.Subnets {
if sn.Contains(block.IP) {
subnet = sn
break
}
}
if subnet == nil {
return ErrNotFound
}
bkey := blockKey(poolName, subnet)
RETRY:
gresp, err := m.etcd.Get(ctx, bkey)
if err != nil {
return err
}
if gresp.Count == 0 {
log.Error("block assignment information has been lost for "+bkey, nil)
return ErrNotFound
}
rev := gresp.Kvs[0].ModRevision
var ba coil.BlockAssignment
err = json.Unmarshal(gresp.Kvs[0].Value, &ba)
if err != nil {
return err
}
err = ba.ReleaseBlock(node, block)
if err == coil.ErrBlockNotFound {
return ErrNotFound
}
if err != nil {
return err
}
output, err := json.Marshal(ba)
if err != nil {
return err
}
var thenOps []clientv3.Op
if force {
thenOps = []clientv3.Op{
clientv3.OpPut(bkey, string(output)),
clientv3.OpDelete(ipKeyPrefix(block), clientv3.WithPrefix()),
}
} else {
thenOps = []clientv3.Op{
clientv3.OpTxn(
[]clientv3.Cmp{clientv3util.KeyMissing(ipKeyPrefix(block)).WithPrefix()},
[]clientv3.Op{clientv3.OpPut(bkey, string(output))},
nil,
),
}
}
tresp, err := m.etcd.Txn(ctx).
If(clientv3.Compare(clientv3.ModRevision(bkey), "=", rev)).
Then(thenOps...).Commit()
if err != nil {
return err
}
if !tresp.Succeeded {
goto RETRY
}
return nil
}