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MoonScript与ElasticSearch客户端

6 months ago 0

作者:糖果

从Github上看,有一位叫做Dhaval Kapil老师完成了ElasticSearch for Lua的工作,另一位来自阿根廷的叫做Cristian Haunsen的老师,完成了ElasticSearch for Lapis的客户端程序写作工作,dhavalkapil还有一个博客可以访问:dhavalkapil.com

这次实验的目标,是测试一下本地直接运行ES for Lua,然后在Lapis中访问ES,我们的日志在ES,可以用Lua,也可以用Python完成ES的访问工作, Python没有问题,Lua就看这个实验了。

测试代码,如下:

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local elasticsearch = require "elasticsearch"

local client = elasticsearch.client{
    hosts = {
      { -- Ignoring any of the following hosts parameters is allowed.
        -- The default shall be set
        protocol = "http",
        host = "localhost",
        port = 9200
      }
    },
    -- Optional parameters
    params = {
      pingTimeout = 2
    }
}

-- Will connect to default host/port
local client = elasticsearch.client()

local data, err = client:info()

Full list of params(全参数列表):

  1. pingTimeout : The timeout of a connection for ping and sniff request. Default is 1.
  2. selector : The type of selection strategy to be used. Default is RoundRobinSelector.
  3. connectionPool : The type of connection pool to be used. Default is StaticConnectionPool.
  4. connectionPoolSettings : The connection pool settings,
  5. maxRetryCount : The maximum times to retry if a particular connection fails.
  6. logLevel : The level of logging to be done. Default is warning.

Getting info of elasticsearch server(取得ES服务器信息)

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local data, err = client:info()

Index a document(创建索引文档)

Everything is represented as a lua table.(一切皆为Lua Table)

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local data, err = client:index{
  index = "my_index",
  type = "my_type",
  id = "my_doc",
  body = {
    my_key = "my_param"
  }
}

Get a document(取得文档)

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data, err = client:get{
  index = "my_index",
  type = "my_type",
  id = "my_doc"
}

Delete a document(删除文档)

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data, err = client:delete{
  index = "my_index",
  type = "my_type",
  id = "my_doc"
}

Searching a document (检索文档)

You can search a document using either query string:(使有查询字符进行检索)

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data, err = client:search{
  index = "my_index",
  type = "my_type",
  q = "my_key:my_param"
}

Or either a request body:(或是请求体)

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data, err = client:search{
  index = "my_index",
  type = "my_type",
  body = {
    query = {
      match = {
        my_key = "my_param"
      }
    }
  }
}

Update a document(更新文档)

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data, err = client:update{
  index = "my_index",
  type = "my_type",
  id = "my_doc",
  body = {
    doc = {
      my_key = "new_param"
    }
  }
}

其实MoonScript for ElasticSearch的库是一个纯正的MoonScript实现,但从Readme中描述 是没显明的看是用MoonScript实现,不防抽出的MoonScript核心实现,贴出来看一下:

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client = elasticsearch.client {
    hosts: config.elasticsearch.hosts and parse_hosts_config(config.elasticsearch.hosts) or {
        {
            protocol: "http"
            host: "127.0.0.1"
            port: 9200
        }
    },
    params: {
        -- Should return a table with { status, statusCode, body }
        preferred_engine: (method, uri, params, body, timeout) ->
            http = require "resty.http"
            httpc = http.new!
            args = { :method, :body, headers: { ["Content-Type"]: "application/json" } }
            res, err = httpc\request_uri(uri, args)

            if not res
                ngx.say("failed to request: ", err)
                return

            response = {}
            response.code = res.status
            response.statusCode = res.status
            response.body = res.body
            return response
    }
}
{
  :interpolate_query, :client
}

API封装以外,用的还是"resty.http"调用,这里有一个疑问,resty.http和simple.http是 不是同一个部件?

原文

lapis-elasticsearch

PS:本文测式用代码都来自至官方ES-LUA的Github的Readme。


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