在某些情况下，有些日志文本文件类json，但它的是单引号，具体格式如下，我们需要根据下列日志数据，获取正确的字段和字段类型
{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘463.36‘, ‘timestamp‘: ‘1532933162361‘}{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘463.378‘, ‘timestamp‘: ‘1532933222335‘}{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘463.38‘, ‘timestamp‘: ‘1532933348347‘}{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘463.252‘, ‘timestamp‘: ‘1532933366866‘}{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘463.31‘, ‘timestamp‘: ‘1532933372350‘}{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘463.046‘, ‘timestamp‘: ‘1532933426899‘}{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘462.806‘, ‘timestamp‘: ‘1532933432346‘}{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘462.956‘, ‘timestamp‘: ‘1532933438353‘}{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘462.954‘, ‘timestamp‘: ‘1532933456796‘}{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘462.856‘, ‘timestamp‘: ‘1532933492411‘}{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘462.776‘, ‘timestamp‘: ‘1532933564378‘}{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘462.628‘, ‘timestamp‘: ‘1532933576849‘}{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘462.612‘, ‘timestamp‘: ‘1532933588338‘}{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘462.718‘, ‘timestamp‘: ‘1532933636808‘}此时我们如果当json直接用logstash Json filter plugin来解析会如下报错
[WARN ] 2018-07-31 10:20:12.708 [Ruby-0-Thread-5@[main]>worker1: :1] json - Error parsing json {:source=>"message", :raw=>"{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘462.134‘, ‘timestamp‘: ‘1532933714371‘}", :exception=>#<LogStash::Json::ParserError: Unexpected character (‘‘‘ (code 39)): was expecting double-quote to start field name at [Source: (byte[])"{‘usdCnyRate‘: ‘6.728‘, ‘futureIndex‘: ‘462.134‘, ‘timestamp‘: ‘1532933714371‘}"; line: 1, column: 3]>}此处我认为简单的做法是替换单引号为双引号，替换过程应用了logstash mutate gsub
一定要看清楚我10-12行的写法，作用为替换字符串，14-15行为解析json。我们还需要将usdCnyRate和futureIndex转为float类型（18-21行），将timestamp转为时间类型，并重新定义一个logdate来存储（23-25行）此处用到
logstash date filter plugin
input{ ???file { ???????path => "/usr/share/logstash/wb.cond/test.log" ???????start_position => "beginning" ???????sincedb_path => "/dev/null" ???}}filter{ ???mutate { ???????gsub =>[ ???????????"message", "‘", ‘"‘ ???????] ???} ???json { ???????source => "message" ???} ???mutate { ???????convert => { ???????????"usdCnyRate" => "float" ???????????"futureIndex" => "float" ???????} ???} ???date { ???????match => [ "timestamp", "UNIX_MS" ] ???????target => "logdate" ???}}output{ ???stdout{ ???????codec=>rubydebug ???}}利用上述配置文件，我们能正确解析出日志文件的字段和类型
{ ???????"message" => "{\"usdCnyRate\": \"6.728\", \"futureIndex\": \"463.378\", \"timestamp\": \"1532933222335\"}", ????"@timestamp" => 2018-07-31T10:48:48.600Z, ??????????"host" => "logstashvm0", ??????????"path" => "/usr/share/logstash/wb.cond/test.log", ??????"@version" => "1", ???????"logdate" => 2018-07-30T06:47:02.335Z, ????"usdCnyRate" => 6.728, ?????"timestamp" => "1532933222335", ???"futureIndex" => 463.378}{ ???????"message" => "{\"usdCnyRate\": \"6.728\", \"futureIndex\": \"463.252\", \"timestamp\": \"1532933366866\"}", ????"@timestamp" => 2018-07-31T10:48:48.602Z, ??????????"host" => "logstashvm0", ??????????"path" => "/usr/share/logstash/wb.cond/test.log", ??????"@version" => "1", ???????"logdate" => 2018-07-30T06:49:26.866Z, ????"usdCnyRate" => 6.728, ?????"timestamp" => "1532933366866", ???"futureIndex" => 463.252}{ ???????"message" => "{\"usdCnyRate\": \"6.728\", \"futureIndex\": \"463.31\", \"timestamp\": \"1532933372350\"}", ????"@timestamp" => 2018-07-31T10:48:48.602Z, ??????????"host" => "logstashvm0", ??????????"path" => "/usr/share/logstash/wb.cond/test.log", ??????"@version" => "1", ???????"logdate" => 2018-07-30T06:49:32.350Z, ????"usdCnyRate" => 6.728, ?????"timestamp" => "1532933372350", ???"futureIndex" => 463.31}Logstash替换字符串，解析json数据，修改数据类型，获取日志时间
原文地址：https://www.cnblogs.com/yangwenbo214/p/9831081.html