nitter/src/redis_cache.nim

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# SPDX-License-Identifier: AGPL-3.0-only
import asyncdispatch, times, strutils, tables, hashes
import redis, redpool, flatty, supersnappy
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import types, api
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const
redisNil = "\0\0"
baseCacheTime = 60 * 60
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var
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pool: RedisPool
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rssCacheTime: int
listCacheTime*: int
# flatty can't serialize DateTime, so we need to define this
proc toFlatty*(s: var string, x: DateTime) =
s.toFlatty(x.toTime().toUnix())
proc fromFlatty*(s: string, i: var int, x: var DateTime) =
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var unix: int64
s.fromFlatty(i, unix)
x = fromUnix(unix).utc()
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proc setCacheTimes*(cfg: Config) =
rssCacheTime = cfg.rssCacheTime * 60
listCacheTime = cfg.listCacheTime * 60
proc migrate*(key, match: string) {.async.} =
pool.withAcquire(r):
let hasKey = await r.get(key)
if hasKey == redisNil:
let list = await r.scan(newCursor(0), match, 100000)
r.startPipelining()
for item in list:
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discard await r.del(item)
await r.setk(key, "true")
discard await r.flushPipeline()
proc initRedisPool*(cfg: Config) {.async.} =
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try:
pool = await newRedisPool(cfg.redisConns, cfg.redisMaxConns,
host=cfg.redisHost, port=cfg.redisPort,
password=cfg.redisPassword)
await migrate("flatty", "*:*")
await migrate("snappyRss", "rss:*")
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await migrate("userBuckets", "p:*")
await migrate("profileDates", "p:*")
pool.withAcquire(r):
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# optimize memory usage for profile ID buckets
await r.configSet("hash-max-ziplist-entries", "1000")
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except OSError:
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stdout.write "Failed to connect to Redis.\n"
stdout.flushFile
quit(1)
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template pidKey(name: string): string = "pid:" & $(hash(name) div 1_000_000)
template profileKey(name: string): string = "p:" & name
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template listKey(l: List): string = "l:" & l.id
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proc get(query: string): Future[string] {.async.} =
pool.withAcquire(r):
result = await r.get(query)
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proc setEx(key: string; time: int; data: string) {.async.} =
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pool.withAcquire(r):
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discard await r.setEx(key, time, data)
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proc cache*(data: List) {.async.} =
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await setEx(data.listKey, listCacheTime, compress(toFlatty(data)))
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proc cache*(data: PhotoRail; name: string) {.async.} =
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await setEx("pr:" & toLower(name), baseCacheTime, compress(toFlatty(data)))
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proc cache*(data: Profile) {.async.} =
if data.username.len == 0 or data.id.len == 0: return
let name = toLower(data.username)
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pool.withAcquire(r):
r.startPipelining()
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discard await r.setEx(name.profileKey, baseCacheTime, compress(toFlatty(data)))
discard await r.setEx("i:" & data.id , baseCacheTime, data.username)
discard await r.hSet(name.pidKey, name, data.id)
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discard await r.flushPipeline()
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proc cacheProfileId*(username, id: string) {.async.} =
if username.len == 0 or id.len == 0: return
let name = toLower(username)
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pool.withAcquire(r):
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discard await r.hSet(name.pidKey, name, id)
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proc cacheRss*(query: string; rss: Rss) {.async.} =
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let key = "rss:" & query
pool.withAcquire(r):
r.startPipelining()
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discard await r.hSet(key, "rss", rss.feed)
discard await r.hSet(key, "min", rss.cursor)
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discard await r.expire(key, rssCacheTime)
discard await r.flushPipeline()
proc getProfileId*(username: string): Future[string] {.async.} =
let name = toLower(username)
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pool.withAcquire(r):
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result = await r.hGet(name.pidKey, name)
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if result == redisNil:
result.setLen(0)
proc getCachedProfile*(username: string; fetch=true): Future[Profile] {.async.} =
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let prof = await get("p:" & toLower(username))
if prof != redisNil:
result = fromFlatty(uncompress(prof), Profile)
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elif fetch:
result = await getProfile(username)
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proc getCachedProfileUsername*(userId: string): Future[string] {.async.} =
let username = await get("i:" & userId)
if username != redisNil:
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result = username
else:
let profile = await getProfileById(userId)
result = profile.username
await cache(profile)
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proc getCachedPhotoRail*(name: string): Future[PhotoRail] {.async.} =
if name.len == 0: return
let rail = await get("pr:" & toLower(name))
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if rail != redisNil:
result = fromFlatty(uncompress(rail), PhotoRail)
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else:
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result = await getPhotoRail(name)
await cache(result, name)
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proc getCachedList*(username=""; slug=""; id=""): Future[List] {.async.} =
let list = if id.len == 0: redisNil
else: await get("l:" & id)
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if list != redisNil:
result = fromFlatty(uncompress(list), List)
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else:
if id.len > 0:
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result = await getGraphList(id)
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else:
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result = await getGraphListBySlug(username, slug)
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await cache(result)
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proc getCachedRss*(key: string): Future[Rss] {.async.} =
let k = "rss:" & key
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pool.withAcquire(r):
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result.cursor = await r.hGet(k, "min")
if result.cursor.len > 2:
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result.feed = await r.hGet(k, "rss")
else:
result.cursor.setLen 0