storj/satellite/accounting/live/redis.go

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// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.
package live
import (
"context"
"errors"
"fmt"
"net/url"
"strconv"
"strings"
"time"
"github.com/go-redis/redis/v8"
"storj.io/common/uuid"
"storj.io/storj/satellite/accounting"
)
type redisLiveAccounting struct {
client *redis.Client
}
// openRedisLiveAccounting returns a redisLiveAccounting cache instance.
//
// It returns accounting.ErrInvalidArgument if the connection address is invalid
// according to Redis.
//
// The function pings to the Redis server for verifying the connectivity but if
// it fails then it returns an instance and accounting.ErrSystemOrNetError
// because it means that Redis may not be operative at this precise moment but
// it may be in future method calls as it handles automatically reconnects.
func openRedisLiveAccounting(ctx context.Context, address string) (*redisLiveAccounting, error) {
redisurl, err := url.Parse(address)
if err != nil {
return nil, accounting.ErrInvalidArgument.New("address: invalid URL; %w", err)
}
if redisurl.Scheme != "redis" {
return nil, accounting.ErrInvalidArgument.New("address: not a redis:// formatted address")
}
q := redisurl.Query()
db := q.Get("db")
if db == "" {
return nil, accounting.ErrInvalidArgument.New("address: a database number has to be specified")
}
dbn, err := strconv.Atoi(db)
if err != nil {
return nil, accounting.ErrInvalidArgument.New("address: invalid database number %s", db)
}
client := redis.NewClient(&redis.Options{
Addr: redisurl.Host,
Password: q.Get("password"),
DB: dbn,
})
cache := &redisLiveAccounting{
client: client,
}
// ping here to verify we are able to connect to Redis with the initialized client.
if err := client.Ping(ctx).Err(); err != nil {
return cache, accounting.ErrSystemOrNetError.New("Redis ping failed: %w", err)
}
return cache, nil
}
// GetProjectStorageUsage gets inline and remote storage totals for a given
// project, back to the time of the last accounting tally.
func (cache *redisLiveAccounting) GetProjectStorageUsage(ctx context.Context, projectID uuid.UUID) (totalUsed int64, err error) {
defer mon.Task()(&ctx, projectID)(&err)
return cache.getInt64(ctx, string(projectID[:]))
}
// GetProjectBandwidthUsage returns the current bandwidth usage
// from specific project.
func (cache *redisLiveAccounting) GetProjectBandwidthUsage(ctx context.Context, projectID uuid.UUID, now time.Time) (currentUsed int64, err error) {
defer mon.Task()(&ctx, projectID, now)(&err)
return cache.getInt64(ctx, createBandwidthProjectIDKey(projectID, now))
}
// UpdateProjectBandwidthUsage increment the bandwidth cache key value.
func (cache *redisLiveAccounting) UpdateProjectBandwidthUsage(ctx context.Context, projectID uuid.UUID, increment int64, ttl time.Duration, now time.Time) (err error) {
mon.Task()(&ctx, projectID, increment, ttl, now)(&err)
// The following script will increment the cache key
// by a specific value. If the key does not exist, it is
// set to 0 before performing the operation.
// The key expiration will be set only in the first iteration.
// To achieve this we compare the increment and key value,
// if they are equal its the first iteration.
// More details on rate limiter section: https://redis.io/commands/incr
script := fmt.Sprintf(`local current
current = redis.call("incrby", KEYS[1], "%d")
if tonumber(current) == %d then
redis.call("expire",KEYS[1], %d)
end
return current
`, increment, increment, int(ttl.Seconds()))
key := createBandwidthProjectIDKey(projectID, now)
err = cache.client.Eval(ctx, script, []string{key}).Err()
if err != nil {
return accounting.ErrSystemOrNetError.New("Redis eval failed: %w", err)
}
return nil
}
// AddProjectStorageUsage lets the live accounting know that the given
satellite/accounting: refactor live accounting to hold current estimated totals live accounting used to be a cache to store writes before they are picked up during the tally iteration, after which the cache is cleared. This created a window in which users could potentially exceed the storage limit. This PR refactors live accounting to hold current estimations of space used per project. This should also reduce DB load since we no longer need to query the satellite DB when checking space used for limiting. The mechanism by which the new live accounting system works is as follows: During the upload of any segment, the size of that segment is added to its respective project total in live accounting. At the beginning of the tally iteration we record the current values in live accounting as `initialLiveTotals`. At the end of the tally iteration we again record the current totals in live accounting as `latestLiveTotals`. The metainfo loop observer in tally allows us to get the project totals from what it observed in metainfo DB which are stored in `tallyProjectTotals`. However, for any particular segment uploaded during the metainfo loop, the observer may or may not have seen it. Thus, we take half of the difference between `latestLiveTotals` and `initialLiveTotals`, and add that to the total that was found during tally and set that as the new live accounting total. Initially, live accounting was storing the total stored amount across all nodes rather than the segment size, which is inconsistent with how we record amounts stored in the project accounting DB, so we have refactored live accounting to record segment size Change-Id: Ie48bfdef453428fcdc180b2d781a69d58fd927fb
2019-10-31 17:27:38 +00:00
// project has just added spaceUsed bytes of storage (from the user's
// perspective; i.e. segment size).
func (cache *redisLiveAccounting) AddProjectStorageUsage(ctx context.Context, projectID uuid.UUID, spaceUsed int64) (err error) {
defer mon.Task()(&ctx, projectID, spaceUsed)(&err)
_, err = cache.client.IncrBy(ctx, string(projectID[:]), spaceUsed).Result()
if err != nil {
return accounting.ErrSystemOrNetError.New("Redis incrby failed: %w", err)
}
return nil
}
satellite/accounting: refactor live accounting to hold current estimated totals live accounting used to be a cache to store writes before they are picked up during the tally iteration, after which the cache is cleared. This created a window in which users could potentially exceed the storage limit. This PR refactors live accounting to hold current estimations of space used per project. This should also reduce DB load since we no longer need to query the satellite DB when checking space used for limiting. The mechanism by which the new live accounting system works is as follows: During the upload of any segment, the size of that segment is added to its respective project total in live accounting. At the beginning of the tally iteration we record the current values in live accounting as `initialLiveTotals`. At the end of the tally iteration we again record the current totals in live accounting as `latestLiveTotals`. The metainfo loop observer in tally allows us to get the project totals from what it observed in metainfo DB which are stored in `tallyProjectTotals`. However, for any particular segment uploaded during the metainfo loop, the observer may or may not have seen it. Thus, we take half of the difference between `latestLiveTotals` and `initialLiveTotals`, and add that to the total that was found during tally and set that as the new live accounting total. Initially, live accounting was storing the total stored amount across all nodes rather than the segment size, which is inconsistent with how we record amounts stored in the project accounting DB, so we have refactored live accounting to record segment size Change-Id: Ie48bfdef453428fcdc180b2d781a69d58fd927fb
2019-10-31 17:27:38 +00:00
// GetAllProjectTotals iterates through the live accounting DB and returns a map of project IDs and totals.
//
// TODO (https://storjlabs.atlassian.net/browse/IN-173): see if it possible to
// get key/value pairs with one single call.
satellite/accounting: refactor live accounting to hold current estimated totals live accounting used to be a cache to store writes before they are picked up during the tally iteration, after which the cache is cleared. This created a window in which users could potentially exceed the storage limit. This PR refactors live accounting to hold current estimations of space used per project. This should also reduce DB load since we no longer need to query the satellite DB when checking space used for limiting. The mechanism by which the new live accounting system works is as follows: During the upload of any segment, the size of that segment is added to its respective project total in live accounting. At the beginning of the tally iteration we record the current values in live accounting as `initialLiveTotals`. At the end of the tally iteration we again record the current totals in live accounting as `latestLiveTotals`. The metainfo loop observer in tally allows us to get the project totals from what it observed in metainfo DB which are stored in `tallyProjectTotals`. However, for any particular segment uploaded during the metainfo loop, the observer may or may not have seen it. Thus, we take half of the difference between `latestLiveTotals` and `initialLiveTotals`, and add that to the total that was found during tally and set that as the new live accounting total. Initially, live accounting was storing the total stored amount across all nodes rather than the segment size, which is inconsistent with how we record amounts stored in the project accounting DB, so we have refactored live accounting to record segment size Change-Id: Ie48bfdef453428fcdc180b2d781a69d58fd927fb
2019-10-31 17:27:38 +00:00
func (cache *redisLiveAccounting) GetAllProjectTotals(ctx context.Context) (_ map[uuid.UUID]int64, err error) {
defer mon.Task()(&ctx)(&err)
satellite/accounting: refactor live accounting to hold current estimated totals live accounting used to be a cache to store writes before they are picked up during the tally iteration, after which the cache is cleared. This created a window in which users could potentially exceed the storage limit. This PR refactors live accounting to hold current estimations of space used per project. This should also reduce DB load since we no longer need to query the satellite DB when checking space used for limiting. The mechanism by which the new live accounting system works is as follows: During the upload of any segment, the size of that segment is added to its respective project total in live accounting. At the beginning of the tally iteration we record the current values in live accounting as `initialLiveTotals`. At the end of the tally iteration we again record the current totals in live accounting as `latestLiveTotals`. The metainfo loop observer in tally allows us to get the project totals from what it observed in metainfo DB which are stored in `tallyProjectTotals`. However, for any particular segment uploaded during the metainfo loop, the observer may or may not have seen it. Thus, we take half of the difference between `latestLiveTotals` and `initialLiveTotals`, and add that to the total that was found during tally and set that as the new live accounting total. Initially, live accounting was storing the total stored amount across all nodes rather than the segment size, which is inconsistent with how we record amounts stored in the project accounting DB, so we have refactored live accounting to record segment size Change-Id: Ie48bfdef453428fcdc180b2d781a69d58fd927fb
2019-10-31 17:27:38 +00:00
projects := make(map[uuid.UUID]int64)
it := cache.client.Scan(ctx, 0, "*", 0).Iterator()
for it.Next(ctx) {
key := it.Val()
satellite/accounting: refactor live accounting to hold current estimated totals live accounting used to be a cache to store writes before they are picked up during the tally iteration, after which the cache is cleared. This created a window in which users could potentially exceed the storage limit. This PR refactors live accounting to hold current estimations of space used per project. This should also reduce DB load since we no longer need to query the satellite DB when checking space used for limiting. The mechanism by which the new live accounting system works is as follows: During the upload of any segment, the size of that segment is added to its respective project total in live accounting. At the beginning of the tally iteration we record the current values in live accounting as `initialLiveTotals`. At the end of the tally iteration we again record the current totals in live accounting as `latestLiveTotals`. The metainfo loop observer in tally allows us to get the project totals from what it observed in metainfo DB which are stored in `tallyProjectTotals`. However, for any particular segment uploaded during the metainfo loop, the observer may or may not have seen it. Thus, we take half of the difference between `latestLiveTotals` and `initialLiveTotals`, and add that to the total that was found during tally and set that as the new live accounting total. Initially, live accounting was storing the total stored amount across all nodes rather than the segment size, which is inconsistent with how we record amounts stored in the project accounting DB, so we have refactored live accounting to record segment size Change-Id: Ie48bfdef453428fcdc180b2d781a69d58fd927fb
2019-10-31 17:27:38 +00:00
// skip bandwidth keys
if strings.HasSuffix(key, "bandwidth") {
continue
}
projectID, err := uuid.FromBytes([]byte(key))
if err != nil {
return nil, accounting.ErrUnexpectedValue.New("cannot parse the key as UUID; key=%q", key)
}
if _, seen := projects[projectID]; seen {
continue
}
val, err := cache.getInt64(ctx, key)
if err != nil {
if accounting.ErrKeyNotFound.Has(err) {
continue
}
return nil, err
satellite/accounting: refactor live accounting to hold current estimated totals live accounting used to be a cache to store writes before they are picked up during the tally iteration, after which the cache is cleared. This created a window in which users could potentially exceed the storage limit. This PR refactors live accounting to hold current estimations of space used per project. This should also reduce DB load since we no longer need to query the satellite DB when checking space used for limiting. The mechanism by which the new live accounting system works is as follows: During the upload of any segment, the size of that segment is added to its respective project total in live accounting. At the beginning of the tally iteration we record the current values in live accounting as `initialLiveTotals`. At the end of the tally iteration we again record the current totals in live accounting as `latestLiveTotals`. The metainfo loop observer in tally allows us to get the project totals from what it observed in metainfo DB which are stored in `tallyProjectTotals`. However, for any particular segment uploaded during the metainfo loop, the observer may or may not have seen it. Thus, we take half of the difference between `latestLiveTotals` and `initialLiveTotals`, and add that to the total that was found during tally and set that as the new live accounting total. Initially, live accounting was storing the total stored amount across all nodes rather than the segment size, which is inconsistent with how we record amounts stored in the project accounting DB, so we have refactored live accounting to record segment size Change-Id: Ie48bfdef453428fcdc180b2d781a69d58fd927fb
2019-10-31 17:27:38 +00:00
}
projects[projectID] = val
}
return projects, nil
}
// Close the DB connection.
func (cache *redisLiveAccounting) Close() error {
err := cache.client.Close()
if err != nil {
return accounting.ErrSystemOrNetError.New("Redis close failed: %w", err)
}
return nil
}
func (cache *redisLiveAccounting) getInt64(ctx context.Context, key string) (_ int64, err error) {
defer mon.Task()(&ctx)(&err)
val, err := cache.client.Get(ctx, key).Bytes()
if err != nil {
if errors.Is(err, redis.Nil) {
return 0, accounting.ErrKeyNotFound.New("%q", key)
}
return 0, accounting.ErrSystemOrNetError.New("Redis get failed: %w", err)
}
intval, err := strconv.ParseInt(string(val), 10, 64)
if err != nil {
return 0, accounting.ErrUnexpectedValue.New("cannot parse the value as int64; key=%q val=%q", key, val)
}
return intval, nil
}
// createBandwidthProjectIDKey creates the bandwidth project key.
// The current month is combined with projectID to create a prefix.
func createBandwidthProjectIDKey(projectID uuid.UUID, now time.Time) string {
// Add current month as prefix
_, month, _ := now.Date()
key := append(projectID[:], byte(int(month)))
return string(key) + ":bandwidth"
}