158 lines
3.8 KiB
Ruby
158 lines
3.8 KiB
Ruby
require "pstore"
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module Pigeon
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class Storage
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def self.current
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@current ||= self.new
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end
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def self.reset
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File.delete(PIGEON_DB_PATH) if File.file?(PIGEON_DB_PATH)
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@current = nil
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end
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def get_message_by_depth(multihash, depth)
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raise "Expected string, got #{multihash.class}" unless multihash.is_a?(String) # Delete later
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# Map<[multihash(str), depth(int)], Signature>
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key = [multihash, depth].join(".")
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read { store[MESSAGE_BY_DEPTH_NS][key] }
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end
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# `nil` means "none"
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#
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def get_message_count_for(mhash)
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raise "Expected string, got #{mhash.class}" unless mhash.is_a?(String) # Delete later
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read { store[COUNT_INDEX_NS][mhash] || 0 }
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end
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def save_message(msg)
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write do
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return msg if store[MESG_NS][msg.multihash]
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insert_and_update_index(msg)
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msg
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end
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end
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def read_message(multihash)
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read { store[MESG_NS].fetch(multihash) }
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end
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def message?(multihash)
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read { store[MESG_NS].fetch(multihash, false) }
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end
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def find_all(author)
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# TODO: Ability to pass an author ID to `find-all`
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store = Pigeon::Storage.current
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all = []
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depth = -1
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last = ""
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until (last == nil) || (depth > 999999)
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last = store.get_message_by_depth(author, depth += 1)
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all.push(last) if last
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end
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return all
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end
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def set_config(key, value)
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write { store[CONF_NS][key] = value }
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end
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def delete_config(key)
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write { store[CONF_NS].delete(key) }
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end
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def get_config(key)
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read { store[CONF_NS][key] }
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end
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def set_blob(data)
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raw_digest = Digest::SHA256.digest(data)
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b64_digest = Helpers.b32_encode(raw_digest)
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multihash = [BLOB_SIGIL, b64_digest, BLOB_FOOTER].join("")
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write { store[BLOB_NS][multihash] = data }
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multihash
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end
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def get_blob(blob_multihash)
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read { store[BLOB_NS][blob_multihash] }
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end
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def add_peer(identity)
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path = Helpers.decode_multihash(identity)
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write { store[PEER_NS].add(identity) }
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identity
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end
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def remove_peer(identity)
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path = Helpers.decode_multihash(identity)
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write { store[PEER_NS].delete(identity) }
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identity
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end
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def block_peer(identity)
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remove_peer(identity)
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write { store[BLCK_NS].add(identity) }
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identity
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end
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def all_peers
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read { store[PEER_NS].to_a }
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end
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def all_blocks
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read { store[BLCK_NS].to_a }
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end
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def bootstrap
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write do
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# Wait what? Why is there a depth and count
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# index??
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store[MESSAGE_BY_DEPTH_NS] ||= {}
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store[COUNT_INDEX_NS] ||= {}
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store[BLOB_NS] ||= {}
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store[CONF_NS] ||= {}
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store[MESG_NS] ||= {}
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store[BLCK_NS] ||= Set.new
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store[PEER_NS] ||= Set.new
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end
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store
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end
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private
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def store
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if @store
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return @store
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else
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@store = PStore.new(PIGEON_DB_PATH)
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bootstrap
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end
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end
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def insert_and_update_index(message)
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pub_key = message.author.multihash
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# STEP 1: Update MESG_NS, the main storage spot.
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store[MESG_NS][message.multihash] = message
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# STEP 2: Update the "message by author and depth" index
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# this index is used to find a person's nth
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# message
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# SECURITY AUDIT: How can we be certain the message is
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# not lying about its depth?
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key = [pub_key, message.depth].join(".")
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store[MESSAGE_BY_DEPTH_NS][key] = message.multihash
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store[COUNT_INDEX_NS][pub_key] ||= 0
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store[COUNT_INDEX_NS][pub_key] += 1
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end
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def transaction(is_read_only)
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store.transaction(is_read_only) { yield }
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end
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def write(&blk); transaction(false, &blk); end
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def read(&blk); transaction(true, &blk); end
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end
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end
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