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redischannelcache.go
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/
redischannelcache.go
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package nodedata
import (
"fmt"
"net/url"
"os"
"regexp"
"strconv"
"sync"
"time"
utils "github.com/bolt-observer/go_common/utils"
"github.com/getsentry/sentry-go"
"github.com/go-redis/redis"
"github.com/golang/glog"
)
// Lock - acquire lock
func (c *RedisChannelCache) Lock() {
// noop
}
// Unlock - release lock
func (c *RedisChannelCache) Unlock() {
// noop
}
// Get - get channel cache
func (c *RedisChannelCache) Get(name string) (string, bool) {
id := fmt.Sprintf("%s_%s", c.env, name)
err := c.client.Exists(id).Err()
if err != nil {
fmt.Fprintf(os.Stderr, "Redis Get error %v\n", err)
return "", false
}
exists := c.client.Exists(id).Val() > 0
if !exists {
return "", false
}
return c.client.Get(id).Val(), true
}
// Set - set channel cache
func (c *RedisChannelCache) Set(name string, value string) {
id := fmt.Sprintf("%s_%s", c.env, name)
status := c.client.Set(id, value, 0*time.Second)
if status.Err() != nil {
fmt.Fprintf(os.Stderr, "Redis Set error %v\n", status.Err())
}
}
// RedisChannelCache - ChannelCache implementation that stores data in redis
type RedisChannelCache struct {
client *redis.Client
env string
deferredCacheMutex sync.Mutex
deferredCache map[string]OldNewVal
}
func censorCredentials(in string) string {
var re = regexp.MustCompile(`(.*://)(.*)@(.*)`)
return re.ReplaceAllString(in, `$1[credentials]@$3`)
}
func removeQueryParams(in string) string {
u, err := url.Parse(in)
if err != nil {
return in
}
u.RawQuery = ""
return u.String()
}
// NewRedisChannelCache - construct new RedisChannelCache
func NewRedisChannelCache() *RedisChannelCache {
url := removeQueryParams(utils.GetEnvWithDefault("REDIS_URL", "redis://127.0.0.1:6379/1"))
opts, err := redis.ParseURL(url)
if err != nil {
sentry.CaptureException(err)
glog.Warningf("Redis url is bad %s %v", censorCredentials(url), err)
return nil
}
db := utils.GetEnvWithDefault("REDIS_DB", "")
if db != "" {
dbNum, err := strconv.Atoi(db)
if err != nil {
sentry.CaptureException(err)
glog.Warningf("Error parsing redis db %s %v", db, err)
} else {
opts.DB = dbNum
}
}
password := utils.GetEnvWithDefault("REDIS_PASSWORD", "")
if password != "" {
opts.Password = password
}
client := redis.NewClient(opts)
resp := &RedisChannelCache{
client: client,
env: utils.GetEnvWithDefault("ENV", "develop"),
deferredCacheMutex: sync.Mutex{},
deferredCache: make(map[string]OldNewVal),
}
if client.Info().Err() != nil {
sentry.CaptureMessage(fmt.Sprintf("Redis seems to be not usable %s %v", censorCredentials(url), err))
glog.Warningf("Redis seems to be not usable %s %v", censorCredentials(url), err)
return nil
}
return resp
}
// DeferredSet - set channel cache but do not commit it yet
func (c *RedisChannelCache) DeferredSet(name, old, new string) {
c.deferredCacheMutex.Lock()
defer c.deferredCacheMutex.Unlock()
glog.V(3).Infof("DeferredSet %s old %s new %s", name, old, new)
c.deferredCache[name] = OldNewVal{OldValue: old, NewValue: new}
}
// DeferredCommit - commit channel cache from DeferredSet
func (c *RedisChannelCache) DeferredCommit() bool {
c.Lock()
c.deferredCacheMutex.Lock()
defer c.Unlock()
defer c.deferredCacheMutex.Unlock()
for k, v := range c.deferredCache {
val, exists := c.Get(k)
if !exists || val == v.OldValue {
glog.V(3).Infof("Commit ok %s from %s to %s", k, val, v.NewValue)
c.Set(k, v.NewValue)
} else {
glog.V(3).Infof("Commit %s not same value %s vs %s", k, val, v.OldValue)
}
}
for k := range c.deferredCache {
delete(c.deferredCache, k)
}
return true
}
// DeferredRevert - revert channel cache from DeferredSet
func (c *RedisChannelCache) DeferredRevert() bool {
c.Lock()
c.deferredCacheMutex.Lock()
defer c.Unlock()
defer c.deferredCacheMutex.Unlock()
for k := range c.deferredCache {
delete(c.deferredCache, k)
}
return true
}