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一文教会你如何使用 iLogtail SPL 处理日志

off999 2025-01-21 20:37 35 浏览 0 评论

随着流式处理的发展,出现了越来越多的工具和语言,使得数据处理变得更加高效、灵活和易用。在此背景下,SLS 推出了 SPL(SLS Processing Language) 语法,以此统一查询、端上处理、数据加工等的语法,保证了数据处理的灵活性。iLogtail 作为日志、时序数据采集器,在 2.0 版本中,全面支持了 SPL 。本文对处理插件进行了梳理,介绍了如何编写 SPL 语句,从插件处理模式迁移到 2.0 版本的 SPL 处理模式,帮助用户实现更加灵活的端上数据处理。

SPL




Cloud Native

iLogtail 一共支持 3 种处理模式。

  • 原生插件模式:由 C++ 实现的原生插件,性能最强。
  • 拓展插件模式:由 Go 实现的拓展插件,提供了丰富的生态,足够灵活。
  • SPL 模式:随着 iLogtail 2.0 在 C++ 处理插件中支持了 SPL 的处理能力,对数据处理能力带来了很大的提升,兼顾性能与灵活性。用户只需要编写 SPL 语句,即可以利用 SPL 的计算能力,完成对数据的处理。SPL 语法可以参考:https://help.aliyun.com/zh/sls/user-guide/spl-syntax/


特点

开发门槛

原生插件

  • C++ 实现
  • 性能高,资源开销极低
  • 较完善的算子能力
  • C++,开发门槛中等
  • 可灵活定制

扩展插件

  • Golang 实现
  • 较高的性能,资源开销低
  • 较完善的算子能力
  • Golang,开发门槛低
  • 可灵活定制

SPL

  • C++ 实现
  • 性能高,资源开销低
  • 全面的算子能力
  • 灵活组合
  • 暂未开源,但是通过语法可解决大部分问题,免去编码。

总的来说,iLogtail 2.0 + SPL 主要有以下的优势:

  1. 统一数据处理语言:对于同样一种格式的数据,用户可以在不同场景中使用同一种语言进行处理,提高了数据处理的效率
  2. 查询处理更高效:SPL 对弱结构化数据友好,同时 SPL 主要算子由 C++ 实现,接近 iLogtail 1.X 版本的原生性能
  3. 丰富的工具和函数:SPL 提供了丰富的内置函数和算子,用户可以更加灵活地进行组合
  4. 简单易学:SPL 属于一种低代码语言,用户可以快速上手,日志搜索、处理一气呵成

接下来,本文将介绍如何用灵活的 SPL 语句,实现其他两种处理模式相同的处理能力。

原生插件对比




Cloud Native


正则解析

根据正则提取提取字段。输入 Nginx 格式:

127.0.0.1 - - [07/Jul/2022:10:43:30 +0800] "POST /PutData?Category=YunOsAccountOpLog" 0.024 18204 200 37 "-" "aliyun-sdk-java"
原有插件:enable: true

inputs:

  - Type: input_file

    FilePaths: 

      - /workspaces/ilogtal/debug/simple.log

processors:

  - Type: processor_parse_regex_native

    SourceKey: content

    Regex: ([\d\.]+) \S+ \S+ \[(\S+) \S+\] \"(\w+) ([^\\"]*)\" ([\d\.]+) (\d+) (\d+) (\d+|-) \"([^\\"]*)\" \"([^\\"]*)\"

    Keys:

      - ip

      - time

      - method

      - url

      - request_time

      - request_length

      - status

      - length

      - ref_url

      - browser

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
SPL:enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | parse-regexp content, '([\d\.]+) \S+ \S+ \[(\S+) \S+\] \"(\w+) ([^\\"]*)\" ([\d\.]+) (\d+) (\d+) (\d+|-) \"([^\\"]*)\" \"([^\\"]*)\"' as ip, time, method, url, request_time, request_length, status, length, ref_url, browser

      | project-away content

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
输出:{

    "ip": "127.0.0.1",

    "time": "07/Jul/2022:10:43:30",

    "method": "POST",

    "url": "/PutData?Category=YunOsAccountOpLog",

    "request_time": "0.024",

    "request_length": "18204",

    "status": "200",

    "length": "37",

    "ref_url": "-",

    "browser": "aliyun-sdk-java",

    "__time__": "1713184059"

}


分隔符解析

根据分隔符分隔提取字段,输入:

127.0.0.1,07/Jul/2022:10:43:30 +0800,POST,PutData Category=YunOsAccountOpLog,0.024,18204,200,37,-,aliyun-sdk-java
原有插件:enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_parse_delimiter_native

    SourceKey: content

    Separator: ","

    Quote: '"'

    Keys:

      - ip

      - time

      - method

      - url

      - request_time

      - request_length

      - status

      - length

      - ref_url

      - browser

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
SPL:enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | parse-csv content as ip, time, method, url, request_time, request_length, status, length, ref_url, browser

      | project-away content

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
输出:{

    "ip": "127.0.0.1",

    "time": "07/Jul/2022:10:43:30 +0800",

    "method": "POST",

    "url": "PutData?Category=YunOsAccountOpLog",

    "request_time": "0.024",

    "request_length": "18204",

    "status": "200",

    "length": "37",

    "ref_url": "-",

    "browser": "aliyun-sdk-java",

    "__time__": "1713231487"

}


Json 解析

解析 json 格式日志,输入:

{"url": "POST /PutData?Category=YunOsAccountOpLog HTTP/1.1","ip": "10.200.98.220",

    "user-agent": "aliyun-sdk-java",

    "request": "{\"status\":\"200\",\"latency\":\"18204\"}",

    "time": "07/Jul/2022:10:30:28",

    "__time__": "1713237315"

}
原有插件:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_parse_json_native

    SourceKey: content

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
SPL:enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | parse-json content

      | project-away content

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
输出:{    "url": "POST /PutData?Category=YunOsAccountOpLog HTTP/1.1",

    "ip": "10.200.98.220",

    "user-agent": "aliyun-sdk-java",

    "request": "{\"status\":\"200\",\"latency\":\"18204\"}",

    "time": "07/Jul/2022:10:30:28",

    "__time__": "1713237315"

}


正则解析+时间解析

根据正则表达式解析字段,并将其中的一个字段解析成日志时间,输入:

127.0.0.1,07/Jul/2022:10:43:30 +0800,POST,PutData Category=YunOsAccountOpLog,0.024,18204,200,37,-,aliyun-sdk-java
原有插件:enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_parse_regex_native

    SourceKey: content

    Regex: ([\d\.]+) \S+ \S+ \[(\S+) \S+\] \"(\w+) ([^\\"]*)\" ([\d\.]+) (\d+) (\d+) (\d+|-) \"([^\\"]*)\" \"([^\\"]*)\"

    Keys:

      - ip

      - time

      - method

      - url

      - request_time

      - request_length

      - status

      - length

      - ref_url

      - browser

  - Type: processor_parse_timestamp_native

    SourceKey: time

    SourceFormat: '%Y-%m-%dT%H:%M:%S'

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
SPL:enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      * 

      | parse-regexp content, '([\d\.]+) \S+ \S+ \[(\S+)\] \"(\w+) ([^\\"]*)\" ([\d\.]+) (\d+) (\d+) (\d+|-) \"([^\\"]*)\" \"([^\\"]*)\"' as ip, time, method, url, request_time, request_length, status, length, ref_url, browser

      | extend ts=date_parse(time, '%Y-%m-%d %H:%i:%S')

      | extend __time__=cast(to_unixtime(ts) as INTEGER)

      | project-away ts

      | project-away content

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
输出:{

    "ip": "127.0.0.1",

    "time": "07/Jul/2022:10:43:30 +0800",

    "method": "POST",

    "url": "PutData?Category=YunOsAccountOpLog",

    "request_time": "0.024",

    "request_length": "18204",

    "status": "200",

    "length": "37",

    "ref_url": "-",

    "browser": "aliyun-sdk-java",

    "__time__": "1713231487"

}


正则解析+过滤

根据正则表达式解析字段,并根据解析后的字段值过滤日志。输入:

127.0.0.1 - - [07/Jul/2022:10:43:30 +0800] "POST /PutData?Category=YunOsAccountOpLog" 0.024 18204 200 37 "-" "aliyun-sdk-java"
127.0.0.1 - - [07/Jul/2022:10:44:30 +0800] "Get /PutData?Category=YunOsAccountOpLog" 0.024 18204 200 37 "-" "aliyun-sdk-java"
原有插件:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_parse_regex_native

    SourceKey: content

    Regex: ([\d\.]+) \S+ \S+ \[(\S+) \S+\] \"(\w+) ([^\\"]*)\" ([\d\.]+) (\d+) (\d+) (\d+|-) \"([^\\"]*)\" \"([^\\"]*)\"

    Keys:

      - ip

      - time

      - method

      - url

      - request_time

      - request_length

      - status

      - length

      - ref_url

      - browser

  - Type: processor_filter_regex_native

    FilterKey:

      - method

      - status

    FilterRegex:

      - ^(POST|PUT)$

      - ^200$

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
SPL:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | parse-regexp content, '([\d\.]+) \S+ \S+ \[(\S+) \S+\] \"(\w+) ([^\\"]*)\" ([\d\.]+) (\d+) (\d+) (\d+|-) \"([^\\"]*)\" \"([^\\"]*)\"' as ip, time, method, url, request_time, request_length, status, length, ref_url, browser

      | project-away content

      | where regexp_like(method, '^(POST|PUT)#39;) and regexp_like(status, '^200#39;)

flushers:

  - Type: flusher_stdout

    OnlyStdout: true输出:
{
    "ip": "127.0.0.1",
    "time": "07/Jul/2022:10:43:30",
    "method": "POST",
    "url": "/PutData?Category=YunOsAccountOpLog",
    "request_time": "0.024",
    "request_length": "18204",
    "status": "200",
    "length": "37",
    "ref_url": "-",
    "browser": "aliyun-sdk-java",
    "__time__": "1713238839"
}


脱敏

将日志中的敏感信息脱敏。输入:

{"account":"1812213231432969","password":"04a23f38"}
原有插件:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_desensitize_native

    SourceKey: content

    Method: const

    ReplacingString: "******"

    ContentPatternBeforeReplacedString: 'password":"'

    ReplacedContentPattern: '[^"]+'

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
SPL:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | parse-regexp content, 'password":"(\S+)"' as password

      | extend content=replace(content, password, '******')

flushers:

  - Type: flusher_stdout

    OnlyStdout: true输出:
{

    "content": "{\"account\":\"1812213231432969\",\"password\":\"******\"}",

    "__time__": "1713239305"

}

拓展插件对比




Cloud Native


添加字段

在输出结果中添加字段,输入:

this is a test log
原有插件:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_add_fields

    Fields:

      service: A

    IgnoreIfExist: false

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
SPL:enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | extend service='A'

flushers:

  - Type: flusher_stdout

    OnlyStdout: true


输出:
{

    "content": "this is a test log",

    "service": "A",

    "__time__": "1713240293"

}


Json 解析+丢弃字段

解析 json 并删除解析后的指定字段。输入:

{"key1": 123456, "key2": "abcd"}
原有插件:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_parse_json_native

    SourceKey: content

  - Type: processor_drop

    DropKeys: 

      - key1

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
SPL:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | parse-json content

      | project-away content

      | project-away key1

flushers:

  - Type: flusher_stdout

    OnlyStdout: true输出:
{    "key2": "abcd",
    "__time__": "1713245944"
}


Json 解析+重命名字段

解析 json 并重命名解析后的字段。输入:

{"key1": 123456, "key2": "abcd"}
原有插件:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_parse_json_native

    SourceKey: content

  - Type: processor_rename

    SourceKeys:

      - key1

    DestKeys:

      - new_key1

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
SPL:enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | parse-json content

      | project-away content

      | project-rename new_key1=key1

flushers:

  - Type: flusher_stdout

    OnlyStdout: true输出:
{

    "new_key1": "123456",

    "key2": "abcd",

    "__time__": "1713249130"

}


Json 解析+过滤日志

解析 json 并根据字段条件过滤日志。输入:

{"ip": "10.**.**.**", "method": "POST", "browser": "aliyun-sdk-java"}
{"ip": "10.**.**.**", "method": "POST", "browser": "chrome"}
{"ip": "192.168.**.**", "method": "POST", "browser": "aliyun-sls-ilogtail"}
原有插件:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_parse_json_native

    SourceKey: content

  - Type: processor_filter_regex

    Include:

      ip: "10\\..*"

      method: POST

    Exclude:

      browser: "aliyun.*"

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
SPL:enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | parse-json content

      | project-away content

      | where regexp_like(ip, '10\..*') and regexp_like(method, 'POST') and not regexp_like(browser, 'aliyun.*')

flushers:

  - Type: flusher_stdout

    OnlyStdout: true输出:
{

    "ip": "10.**.**.**",

    "method": "POST",

    "browser": "chrome",

    "__time__": "1713246645"

}


Json 解析+字段值映射处理

解析 json 并根据字段值的不同,映射为不同的值。输入:

{"_ip_":"192.168.0.1","Index":"900000003"}
{"_ip_":"255.255.255.255","Index":"3"}
原有插件:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_parse_json_native

    SourceKey: content

  - Type: processor_dict_map

    MapDict:

      "127.0.0.1": "LocalHost-LocalHost"

      "192.168.0.1": "default login"

    SourceKey: "_ip_"

    DestKey: "_processed_ip_"

    Mode: "overwrite"

    HandleMissing": true

    Missing: "Not Detected"

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
SPL:enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | parse-json content

      | project-away content

      | extend _processed_ip_= 

      CASE 

        WHEN _ip_ = '127.0.0.1' THEN 'LocalHost-LocalHost' 

        WHEN _ip_ = '192.168.0.1' THEN 'default login' 

        ELSE 'Not Detected'

      END

flushers:

  - Type: flusher_stdout

    OnlyStdout: true输出:
{

    "_ip_": "192.168.0.1",

    "Index": "900000003",

    "_processed_ip_": "default login",

    "__time__": "1713259557"

}


字符串替换

替换日志中的指定字符串。输入:

hello,how old are you? nice to meet you
原有插件:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_string_replace

    SourceKey: content

    Method: const

    Match: "how old are you?"

    ReplaceString: ""

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
SPL:enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | extend content=replace(content, 'how old are you?', '')

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
输出:{    "content": "hello, nice to meet you",

    "__time__": "1713260499"

}


数据编码与解码

Base64

对日志进行 Base64 加密。输入:

this is a test log
原有插件:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_base64_encoding

    SourceKey: content

    NewKey: content1

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
SPL:enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | extend content1=to_base64(cast(content as varbinary))

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
输出:{    "content": "this is a test log",

    "content1": "dGhpcyBpcyBhIHRlc3QgbG9n",

    "__time__": "1713318724"

}

MD5

对日志进行 MD5 加密。输入:

hello,how old are you? nice to meet you
原有插件:enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_string_replace

    SourceKey: content

    Method: const

    Match: "how old are you?"

    ReplaceString: ""

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
SPL:enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | extend content1=lower(to_hex(md5(cast(content as varbinary))))

flushers:

  - Type: flusher_stdout

    OnlyStdout: true输出:
{

    "content": "this is a test log",

    "content1": "4f3c93e010f366eca78e00dc1ed08984",

    "__time__": "1713319673"

}

新增能力项




Cloud Native


数学计算

输入:4。SPL:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | extend val = cast(content as double)

      | extend power_test = power(val, 2)

      | extend round_test = round(val)

      | extend sqrt_test = sqrt(val)

flushers:

  - Type: flusher_stdout

    OnlyStdout: true输出:
{

    "content": "4",

    "power_test": 16.0,

    "round_test": 4.0,

    "sqrt_test": 2.0,

    "val": 4.0,

    "__time__": "1713319673"

}


URL 计算

URL 编码解码

输入:

https://homenew.console.aliyun.com/home/dashboard/ProductAndService

SPL:

enable: true
inputs:
  - Type: input_file
    FilePaths:
      - /workspaces/ilogtail/debug/simple.log
processors:
  - Type: processor_spl
    Script: |
      *
      | extend encoded = url_encode(content)
      | extend decoded = url_decode(encoded)
flushers:
  - Type: flusher_stdout
    OnlyStdout: true

输出:

{

    "content": "https://homenew.console.aliyun.com/home/dashboard/ProductAndService",

    "decoded": "https://homenew.console.aliyun.com/home/dashboard/ProductAndService",

    "encoded": "https%3A%2F%2Fhomenew.console.aliyun.com%2Fhome%2Fdashboard%2FProductAndService",

    "__time__": "1713319673"

}

URL 提取

输入:

https://sls.console.aliyun.com:443/lognext/project/dashboard-all/logsearch/nginx-demo?accounttraceid=d6241a173f88471c91d3405cda010ff5ghdw

SPL:

enable: true
inputs:
  - Type: input_file
    FilePaths:
      - /workspaces/ilogtail/debug/simple.log
processors:
  - Type: processor_spl
    Script: |
      *
      | extend host = url_extract_host(content)
      | extend query = url_extract_query(content)
      | extend path = url_extract_path(content) 
      | extend protocol = url_extract_protocol(content) 
      | extend port = url_extract_port(content) 
      | extend param = url_extract_parameter(content, 'accounttraceid')
flushers:
  - Type: flusher_stdout
    OnlyStdout: true

输出:

{

    "content": "https://sls.console.aliyun.com:443/lognext/project/dashboard-all/logsearch/nginx-demo?accounttraceid=d6241a173f88471c91d3405cda010ff5ghdw",

    "host": "sls.console.aliyun.com",

    "param": "d6241a173f88471c91d3405cda010ff5ghdw",

    "path": "/lognext/project/dashboard-all/logsearch/nginx-demo",

    "port": "443",

    "protocol": "https",

    "query": "accounttraceid=d6241a173f88471c91d3405cda010ff5ghdw",

    "__time__": "1713319673"

}


比较&逻辑运算符

输入:
{"num1": 199, "num2": 10, "num3": 9}
SPL:
enable: true

inputs:

  - Type: input_file

    FilePaths:

      - /workspaces/ilogtail/debug/simple.log

processors:

  - Type: processor_spl

    Script: |

      *

      | parse-json content

      | extend compare_result = cast(num1 as double) > cast(num2 as double) AND cast(num2 as double) > cast(num3 as double)

flushers:

  - Type: flusher_stdout

    OnlyStdout: true
输出:{    "compare_result": "true",

    "content": "{\"num1\": 199, \"num2\": 10, \"num3\": 9}",

    "num1": "199",

    "num2": "10",

    "num3": "9",

    "__time__": "1713319673"

}


其他

更多能力请参考:https://help.aliyun.com/zh/sls/user-guide/function-overview

欢迎大家补充更多 iLogtail SPL 实践案例!

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