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feat(pubsub): support kafka (apache#7032)
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,137 @@ | ||
| -- | ||
| -- Licensed to the Apache Software Foundation (ASF) under one or more | ||
| -- contributor license agreements. See the NOTICE file distributed with | ||
| -- this work for additional information regarding copyright ownership. | ||
| -- The ASF licenses this file to You under the Apache License, Version 2.0 | ||
| -- (the "License"); you may not use this file except in compliance with | ||
| -- the License. You may obtain a copy of the License at | ||
| -- | ||
| -- http://www.apache.org/licenses/LICENSE-2.0 | ||
| -- | ||
| -- Unless required by applicable law or agreed to in writing, software | ||
| -- distributed under the License is distributed on an "AS IS" BASIS, | ||
| -- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| -- See the License for the specific language governing permissions and | ||
| -- limitations under the License. | ||
| -- | ||
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| local core = require("apisix.core") | ||
| local bconsumer = require("resty.kafka.basic-consumer") | ||
| local ffi = require("ffi") | ||
| local C = ffi.C | ||
| local tostring = tostring | ||
| local type = type | ||
| local ipairs = ipairs | ||
| local str_sub = string.sub | ||
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| ffi.cdef[[ | ||
| int64_t atoll(const char *num); | ||
| ]] | ||
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| local _M = {} | ||
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| -- Handles the conversion of 64-bit integers in the lua-protobuf. | ||
| -- | ||
| -- Because of the limitations of luajit, we cannot use native 64-bit | ||
| -- numbers, so pb decode converts int64 to a string in #xxx format | ||
| -- to avoid loss of precision, by this function, we convert this | ||
| -- string to int64 cdata numbers. | ||
| local function pb_convert_to_int64(src) | ||
| if type(src) == "string" then | ||
| -- the format is #1234, so there is a small minimum length of 2 | ||
| if #src < 2 then | ||
| return 0 | ||
| end | ||
| return C.atoll(ffi.cast("char *", src) + 1) | ||
| else | ||
| return src | ||
| end | ||
| end | ||
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| -- Takes over requests of type kafka upstream in the http_access phase. | ||
| function _M.access(api_ctx) | ||
| local pubsub, err = core.pubsub.new() | ||
| if not pubsub then | ||
| core.log.error("failed to initialize pubsub module, err: ", err) | ||
| core.response.exit(400) | ||
| return | ||
| end | ||
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| local up_nodes = api_ctx.matched_upstream.nodes | ||
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| -- kafka client broker-related configuration | ||
| local broker_list = {} | ||
| for i, node in ipairs(up_nodes) do | ||
| broker_list[i] = { | ||
| host = node.host, | ||
| port = node.port, | ||
| } | ||
| end | ||
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| local client_config = {refresh_interval = 30 * 60 * 1000} | ||
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| -- load and create the consumer instance when it is determined | ||
| -- that the websocket connection was created successfully | ||
| local consumer = bconsumer:new(broker_list, client_config) | ||
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| pubsub:on("cmd_kafka_list_offset", function (params) | ||
| -- The timestamp parameter uses a 64-bit integer, which is difficult | ||
| -- for luajit to handle well, so the int64_as_string option in | ||
| -- lua-protobuf is used here. Smaller numbers will be decoded as | ||
| -- lua number, while overly larger numbers will be decoded as strings | ||
| -- in the format #number, where the # symbol at the beginning of the | ||
| -- string will be removed and converted to int64_t with the atoll function. | ||
| local timestamp = pb_convert_to_int64(params.timestamp) | ||
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| local offset, err = consumer:list_offset(params.topic, params.partition, timestamp) | ||
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| if not offset then | ||
| return nil, "failed to list offset, topic: " .. params.topic .. | ||
| ", partition: " .. params.partition .. ", err: " .. err | ||
| end | ||
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| offset = tostring(offset) | ||
| return { | ||
| kafka_list_offset_resp = { | ||
| offset = str_sub(offset, 1, #offset - 2) | ||
| } | ||
| } | ||
| end) | ||
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| pubsub:on("cmd_kafka_fetch", function (params) | ||
| local offset = pb_convert_to_int64(params.offset) | ||
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| local ret, err = consumer:fetch(params.topic, params.partition, offset) | ||
| if not ret then | ||
| return nil, "failed to fetch message, topic: " .. params.topic .. | ||
| ", partition: " .. params.partition .. ", err: " .. err | ||
| end | ||
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| -- split into multiple messages when the amount of data in | ||
| -- a single batch is too large | ||
| local messages = ret.records | ||
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| -- special handling of int64 for luajit compatibility | ||
| for _, message in ipairs(messages) do | ||
| local timestamp = tostring(message.timestamp) | ||
| message.timestamp = str_sub(timestamp, 1, #timestamp - 2) | ||
| local offset = tostring(message.offset) | ||
| message.offset = str_sub(offset, 1, #offset - 2) | ||
| end | ||
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| return { | ||
| kafka_fetch_resp = { | ||
| messages = messages, | ||
| }, | ||
| } | ||
| end) | ||
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| -- start processing client commands | ||
| pubsub:wait() | ||
| end | ||
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| return _M |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -216,7 +216,8 @@ | |
| "type": "category", | ||
| "label": "PubSub", | ||
| "items": [ | ||
| "pubsub" | ||
| "pubsub", | ||
| "pubsub/kafka" | ||
| ] | ||
| }, | ||
| { | ||
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