將 Tomcat access log 記錄到 MongoDB 的插件：Tomcat Mongo Access Log

Tomcat Mongo Access Log 是一個將 Tomcat access log 記錄到 MongoDB 的插件。

使用方式和Tomcat自帶的AccessLogValve基本一致，只需要簡單配置就能夠實現將日志存入到mongodb的功能。

例子（替換掉server.xml中原來的AccessLogValve配置）：

<!--
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
       prefix="localhost_access_log." suffix=".txt"
      pattern="%h %l %u %t &quot;%r&quot; %s %b" />
-->
<Valve 
    className="chanjarster.tomcat.valves.MongoAccessLogValve" 
    uri="mongodb://url/to/mongodb"
    pattern="all" />

Attributes

MongoAccessLogValve supports the following configuration attributes of AccessLogValve :

1. condition
2. resolveHosts
3. conditionIf
4. excludes
5. pattern. A little different from AccessLogValve, see below
6. requestAttributesEnabled

And some attributes differs from AccessLogValve:

Collection Indexes

While it's hard to determine which fields should be indexed, but MongoAccessLogVavle provide the following indexes when it creates the Collection, so the query performance is not guaranteed. May be it's better to determine how to create index by yourself.

{ sessionId : 1}
{ datetime : -1}
{ user : 1}
{ statusCode : 1}
{ elapsedSeconds : 1}
{ elapsedMilliseconds : 1}
{ bytesSent : 1}
{ url : 1}
{ method : 1}

{ url : 1, datetime : -1}

{ user : 1, statusCode : 1}
{ user : 1, datetime : -1}
{ user : 1, sessionId : 1, statusCode : 1, datetime : -1}
{ user : 1, sessionId : 1, url : 1, statusCode : 1, datetime : -1}

{ sessionId : 1, datetime : -1}
{ sessionId : 1, statusCode : 1}
{ sessionId : 1, statusCode : 1, datetime : -1}
{ sessionId : 1, url : 1, statusCode : 1, datetime : -1}

Patterns

All the pattern of AccessLogValve are supported while MongoAccessLogValve save them in a JSON form.

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