bouncer/internal/store/redis/proxy_repository.go

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package redis
import (
"context"
"time"
"forge.cadoles.com/cadoles/bouncer/internal/store"
"github.com/pkg/errors"
"github.com/redis/go-redis/v9"
)
const (
keyPrefixProxy = "proxy"
)
type ProxyRepository struct {
client redis.UniversalClient
txMaxAttempts int
txRetryBaseDelay time.Duration
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}
// GetProxy implements store.ProxyRepository
func (r *ProxyRepository) GetProxy(ctx context.Context, name store.ProxyName) (*store.Proxy, error) {
key := proxyKey(name)
var proxyItem *proxyItem
err := WithRetry(ctx, r.client, key, func(ctx context.Context, tx *redis.Tx) error {
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pItem, err := r.txGetProxyItem(ctx, tx, name)
if err != nil {
return errors.WithStack(err)
}
proxyItem = pItem
return nil
}, r.txMaxAttempts, r.txRetryBaseDelay)
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if err != nil {
return nil, errors.WithStack(err)
}
proxy, err := proxyItem.ToProxy()
if err != nil {
return nil, errors.WithStack(err)
}
return proxy, nil
}
func (r *ProxyRepository) txGetProxyItem(ctx context.Context, tx *redis.Tx, name store.ProxyName) (*proxyItem, error) {
proxyItem := proxyItem{}
key := proxyKey(name)
exists, err := tx.Exists(ctx, key).Uint64()
if err != nil {
return nil, errors.WithStack(err)
}
if exists == 0 {
return nil, errors.WithStack(store.ErrNotFound)
}
if err := tx.HGetAll(ctx, key).Scan(&proxyItem.proxyHeaderItem); err != nil {
return nil, errors.WithStack(err)
}
if err := tx.HGetAll(ctx, key).Scan(&proxyItem); err != nil {
return nil, errors.WithStack(err)
}
return &proxyItem, nil
}
// CreateProxy implements store.ProxyRepository
func (r *ProxyRepository) CreateProxy(ctx context.Context, name store.ProxyName, to string, from ...string) (*store.Proxy, error) {
now := time.Now().UTC()
key := proxyKey(name)
txf := func(tx *redis.Tx) error {
exists, err := tx.Exists(ctx, key).Uint64()
if err != nil {
return errors.WithStack(err)
}
if exists > 0 {
return errors.WithStack(store.ErrAlreadyExist)
}
proxyItem := &proxyItem{
proxyHeaderItem: proxyHeaderItem{
Name: string(name),
CreatedAt: wrap(now),
UpdatedAt: wrap(now),
Weight: 0,
Revision: 0,
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Enabled: false,
},
To: to,
From: wrap(from),
}
_, err = tx.TxPipelined(ctx, func(p redis.Pipeliner) error {
p.HMSet(ctx, key, proxyItem.proxyHeaderItem)
p.HMSet(ctx, key, proxyItem)
return nil
})
if err != nil {
return errors.WithStack(err)
}
return nil
}
err := r.client.Watch(ctx, txf, key)
if err != nil {
return nil, errors.WithStack(err)
}
return &store.Proxy{
ProxyHeader: store.ProxyHeader{
Name: name,
Weight: 0,
Enabled: false,
},
To: to,
From: from,
CreatedAt: now,
UpdatedAt: now,
}, nil
}
// DeleteProxy implements store.ProxyRepository
func (r *ProxyRepository) DeleteProxy(ctx context.Context, name store.ProxyName) error {
key := proxyKey(name)
if cmd := r.client.Del(ctx, key); cmd.Err() != nil {
return errors.WithStack(cmd.Err())
}
return nil
}
// QueryProxy implements store.ProxyRepository
func (r *ProxyRepository) QueryProxy(ctx context.Context, funcs ...store.QueryProxyOptionFunc) ([]*store.ProxyHeader, error) {
opts := store.DefaultQueryProxyOptions()
for _, fn := range funcs {
fn(opts)
}
iter := r.client.Scan(ctx, 0, keyPrefixProxy+"*", 0).Iterator()
headers := make([]*store.ProxyHeader, 0)
for iter.Next(ctx) {
key := iter.Val()
proxyHeaderItem := &proxyHeaderItem{}
if err := r.client.HGetAll(ctx, key).Scan(proxyHeaderItem); err != nil {
return nil, errors.WithStack(err)
}
proxyHeader, err := proxyHeaderItem.ToProxyHeader()
if err != nil {
return nil, errors.WithStack(err)
}
if opts.Enabled != nil && proxyHeader.Enabled != *opts.Enabled {
continue
}
if opts.Names != nil && !contains(opts.Names, proxyHeader.Name) {
continue
}
headers = append(headers, proxyHeader)
}
if err := iter.Err(); err != nil {
return nil, errors.WithStack(err)
}
return headers, nil
}
// UpdateProxy implements store.ProxyRepository
func (r *ProxyRepository) UpdateProxy(ctx context.Context, name store.ProxyName, funcs ...store.UpdateProxyOptionFunc) (*store.Proxy, error) {
opts := &store.UpdateProxyOptions{}
for _, fn := range funcs {
fn(opts)
}
key := proxyKey(name)
var proxyItem proxyItem
err := WithRetry(ctx, r.client, key, func(ctx context.Context, tx *redis.Tx) error {
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item, err := r.txGetProxyItem(ctx, tx, name)
if err != nil {
return errors.WithStack(err)
}
if opts.Enabled != nil {
item.Enabled = *opts.Enabled
}
if opts.From != nil {
item.From = wrap(opts.From)
}
if opts.Weight != nil {
item.Weight = *opts.Weight
}
if opts.To != nil {
item.To = *opts.To
}
item.UpdatedAt = wrap(time.Now().UTC())
item.Revision = item.Revision + 1
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_, err = tx.TxPipelined(ctx, func(p redis.Pipeliner) error {
p.HMSet(ctx, key, item.proxyHeaderItem)
p.HMSet(ctx, key, item)
return nil
})
if err != nil {
return errors.WithStack(err)
}
proxyItem = *item
return nil
}, r.txMaxAttempts, r.txRetryBaseDelay)
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if err != nil {
return nil, errors.WithStack(err)
}
proxy, err := proxyItem.ToProxy()
if err != nil {
return nil, errors.WithStack(err)
}
return proxy, nil
}
func NewProxyRepository(client redis.UniversalClient, txMaxAttempts int, txRetryBaseDelay time.Duration) *ProxyRepository {
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return &ProxyRepository{
client: client,
txMaxAttempts: 20,
txRetryBaseDelay: txRetryBaseDelay,
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}
}
var _ store.ProxyRepository = &ProxyRepository{}
func proxyKey(name store.ProxyName) string {
return key(keyPrefixProxy, string(name))
}