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add mongo driver from lua-mongo project (wip)
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云风
286
lualib/mongo.lua
Normal file
286
lualib/mongo.lua
Normal file
@@ -0,0 +1,286 @@
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local bson = require "bson"
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local socket = require "socket"
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local driver = require "mongo.driver"
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local rawget = rawget
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local assert = assert
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local bson_encode = bson.encode
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local bson_decode = bson.decode
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local empty_bson = bson_encode {}
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local mongo = {}
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mongo.null = assert(bson.null)
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mongo.maxkey = assert(bson.maxkey)
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mongo.minkey = assert(bson.minkey)
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mongo.type = assert(bson.type)
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local mongo_cursor = {}
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local cursor_meta = {
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__index = mongo_cursor,
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}
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local mongo_client = {}
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local client_meta = {
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__index = function(self, key)
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return rawget(mongo_client, key) or self:getDB(key)
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end,
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__tostring = function (self)
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local port_string
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if self.port then
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port_string = ":" .. tostring(self.port)
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else
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port_string = ""
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end
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return "[mongo client : " .. self.host .. port_string .."]"
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end,
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__gc = function(self)
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self:disconnect()
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end
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}
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local mongo_db = {}
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local db_meta = {
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__index = function (self, key)
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return rawget(mongo_db, key) or self:getCollection(key)
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end,
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__tostring = function (self)
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return "[mongo db : " .. self.name .. "]"
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end
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}
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local mongo_collection = {}
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local collection_meta = {
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__index = function(self, key)
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return rawget(mongo_collection, key) or self:getCollection(key)
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end ,
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__tostring = function (self)
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return "[mongo collection : " .. self.full_name .. "]"
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end
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}
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function mongo.client( obj )
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obj.port = obj.port or 27017
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obj.__id = 0
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obj.__sock = assert(socket.open(obj.host, obj.port),"Connect failed")
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return setmetatable(obj, client_meta)
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end
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function mongo_client:getDB(dbname)
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local db = {
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connection = self,
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name = dbname,
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full_name = dbname,
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database = false,
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__cmd = dbname .. "." .. "$cmd",
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}
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db.database = db
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return setmetatable(db, db_meta)
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end
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function mongo_client:disconnect()
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if self.__sock then
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socket.close(self.__sock)
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self.__sock = nil
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end
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end
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function mongo_client:genId()
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local id = self.__id + 1
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self.__id = id
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return id
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end
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function mongo_client:runCommand(cmd)
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if not self.admin then
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self.admin = self:getDB "admin"
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end
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return self.admin:runCommand(cmd)
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end
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local function get_reply(sock, result)
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local length = driver.length(socket.read(sock, 4))
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local reply = socket.read(sock, length)
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return reply, driver.reply(reply, result)
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end
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function mongo_db:runCommand(cmd)
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local request_id = self.connection:genId()
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local sock = self.connection.__sock
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socket.lock(sock)
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local pack = driver.query(request_id, 0, self.__cmd, 0, 1, bson_encode(cmd))
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-- todo: check send
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socket.write(sock, pack)
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local _, succ, reply_id, doc = get_reply(sock)
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socket.unlock(sock)
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assert(request_id == reply_id, "Reply from mongod error")
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-- todo: check succ
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return bson_decode(doc)
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end
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function mongo_db:getCollection(collection)
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local col = {
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connection = self.connection,
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name = collection,
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full_name = self.full_name .. "." .. collection,
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database = self.database,
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}
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self[collection] = setmetatable(col, collection_meta)
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return col
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end
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mongo_collection.getCollection = mongo_db.getCollection
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function mongo_collection:insert(doc)
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if doc._id == nil then
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doc._id = bson.objectid()
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end
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local sock = self.connection.__sock
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local pack = driver.insert(0, self.full_name, bson_encode(doc))
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-- todo: check send
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-- flags support 1: ContinueOnError
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socket.write(sock, pack)
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end
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function mongo_collection:batch_insert(docs)
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for i=1,#docs do
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if docs[i]._id == nil then
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docs[i]._id = bson.objectid()
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end
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docs[i] = bson_encode(docs[i])
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end
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local sock = self.connection.__sock
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local pack = driver.insert(0, self.full_name, docs)
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-- todo: check send
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socket.write(sock, pack)
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end
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function mongo_collection:update(selector,update,upsert,multi)
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local flags = (upsert and 1 or 0) + (multi and 2 or 0)
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local sock = self.connection.__sock
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local pack = driver.update(self.full_name, flags, bson_encode(selector), bson_encode(update))
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-- todo: check send
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socket.write(sock, pack)
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end
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function mongo_collection:delete(selector, single)
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local sock = self.connection.__sock
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local pack = driver.delete(self.full_name, single, bson_encode(selector))
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-- todo: check send
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socket.write(sock, pack)
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end
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function mongo_collection:findOne(query, selector)
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local request_id = self.connection:genId()
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local sock = self.connection.__sock
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socket.lock(sock)
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local pack = driver.query(request_id, 0, self.full_name, 0, 1, query and bson_encode(query) or empty_bson, selector and bson_encode(selector))
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-- todo: check send
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socket.write(sock, pack)
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local _, succ, reply_id, doc = get_reply(sock)
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socket.unlock(sock)
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assert(request_id == reply_id, "Reply from mongod error")
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-- todo: check succ
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return bson_decode(doc)
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end
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function mongo_collection:find(query, selector)
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return setmetatable( {
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__collection = self,
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__query = query and bson_encode(query) or empty_bson,
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__selector = selector and bson_encode(selector),
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__ptr = nil,
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__data = nil,
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__cursor = nil,
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__document = {},
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__flags = 0,
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} , cursor_meta)
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end
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function mongo_cursor:hasNext()
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if self.__ptr == nil then
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if self.__document == nil then
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return false
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end
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local conn = self.__collection.connection
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local request_id = conn:genId()
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local sock = conn.__sock
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local pack
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if self.__data == nil then
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pack = driver.query(request_id, self.__flags, self.__collection.full_name,0,0,self.__query,self.__selector)
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else
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if self.__cursor then
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pack = driver.more(request_id, self.__collection.full_name,0,self.__cursor)
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else
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-- no more
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self.__document = nil
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self.__data = nil
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return false
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end
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end
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socket.lock(sock)
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--todo: check send
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socket.write(sock, pack)
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local data, succ, reply_id, doc, cursor = get_reply(sock, self.__document)
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socket.unlock(sock)
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assert(request_id == reply_id, "Reply from mongod error")
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if succ then
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if doc then
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self.__data = data
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self.__ptr = 1
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self.__cursor = cursor
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return true
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else
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self.__document = nil
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self.__data = nil
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self.__cursor = nil
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return false
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end
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else
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self.__document = nil
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self.__data = nil
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self.__cursor = nil
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if doc then
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local err = bson_decode(doc)
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error(err["$err"])
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else
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error("Reply from mongod error")
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end
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end
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end
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return true
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end
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function mongo_cursor:next()
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if self.__ptr == nil then
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error "Call hasNext first"
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end
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local r = bson_decode(self.__document[self.__ptr])
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self.__ptr = self.__ptr + 1
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if self.__ptr > #self.__document then
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self.__ptr = nil
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end
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return r
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end
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function mongo_cursor:close()
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-- todo: warning hasNext after close
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if self.__cursor then
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local sock = self.__collection.connection.__sock
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local pack = driver.kill(self.__cursor)
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-- todo: check send
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socket.write(sock, pack)
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end
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end
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return mongo
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