# I am the Watcher. I am your guide through this vast new twtiverse.
# 
# Usage:
#     https://watcher.sour.is/api/plain/users              View list of users and latest twt date.
#     https://watcher.sour.is/api/plain/twt                View all twts.
#     https://watcher.sour.is/api/plain/mentions?uri=:uri  View all mentions for uri.
#     https://watcher.sour.is/api/plain/conv/:hash         View all twts for a conversation subject.
# 
# Options:
#     uri     Filter to show a specific users twts.
#     offset  Start index for quey.
#     limit   Count of items to return (going back in time).
# 
# twt range = 1 1
# self = https://watcher.sour.is/conv/rza4vca
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代碼精讀 LevelDB 布隆濾波器**
簡介--布隆濾波器 BloomFilter 是一種常用的「使用少量字節數判斷鍵值存在性」的手段。其大致原理爲：使用多個哈希函數，對同一個鍵值做哈希運行，並將其哈希值取模設置比特數值。當給定一個鍵值時，如果計算上述多個哈希函數，存在一個哈希值對應的比特位爲零，則說明該鍵值不存在。從上可以發現，BloomFilter 常用於判斷鍵的不存在性。由於哈希碰撞的原因，可能存在假陽性 (False Posit ⌘ Read more