Logs Data Platform - Tail

This tool allows you to display the logs pushed in Logs Data Platform in real time. More infos on Logs Data Platform and how to obtain the stream uri: https://docs.ovh.com/gb/en/logs-data-platform/ldp-tail/

Installation

To install cli, simply run:

$ go install github.com/ovh/ldp-tail@latest

Usage

ldp-tail --address <URI>

Demo

ldp-tail --address wss://gra1.logs.ovh.com/tail/?tk=demo --pattern "{{ .short_message }}"

Parameters

Server
- address URI of the websocket
Filtering
- match Display only messages matching the condition. Example: _method=verifyPassword. You may specify an operator like: _method.begin=verify or negate its meaning like: _method.not.begin=verify. Available operators are:
  - present The field is present
  - begin The field begins with the value
  - contain The field contains the value
  - lt The field is less than the value
  - le The field is less than or equal to the value
  - eq The field is equal to the value
  - ge The field is greater than or equal to the value
  - gt The field is greater than the value
  - regex The field match the regular expression
Formatting
- raw Display raw JSON message instead of parsing it
- format Display messages using a pre-defined format. Valid values:
  - logrus Display messages like Logrus for messages sent with Graylog Hook for Logrus
  - logrus-color Display colored messages like Logrus for messages sent with Graylog Hook for Logrus
- pattern Template to apply on each message to display it. Default: {{._appID}}> {{.short_message}}. Custom available functions are:
  - color Set text color. Available colors are: green white yellow red blue magenta cyan
  - bColor Set background color. Available colors are: green white yellow red blue magenta cyan
  - noColor Disable text and background color
  - date Transform a timestamp in a human readable date. Default format is 2006-01-02 15:04:05 but can be customized with the second optional argument
  - join Concatenates strings passed in argument with the first argument used as separator
  - concat Concatenates strings passed in argument
  - duration Transform a value in a human readable duration. First argument must be a parsable number. The second argument is the multiplier coefficient to be applied based on nanoseconds. Ex: 1000000 if the value is in milliseconds.
  - int Converts a string or a number to an int64
  - float Converts a string to float64
  - string Converts a value to a string
  - get Return the value under the key passed in the second argument of the map passed first argument. Useful for accessing keys containing a period. Ex: {{ get . "foo.bar" }}
  - column Formats input into multiple columns. Columns are delimited with the characters supplied in the first argument. Ex: "{{ column " | " (date .timestamp) (concat ._method " " ._path ) ._httpStatus_int }}
  - begin Return true if the first argument begins with the second
  - contain Return true if the second argument is within the first
  - level Transform a Gelf/Syslog level value (0-7) to a syslog severity keyword
Config
- config Config file loaded before parsing parameters, so parameters will override the values in the config file (except for match where parameters will add more criteria instead of replacing them). The config file use the TOML file format. The structure of the configuration file is:

Address string
Match   []{
    Key      string
    Operator string
    Value    interface{}
    Not      bool
}
Pattern string
Raw     bool

Exemple:

Address = "wss://gra1.logs.ovh.com/tail/?tk=demo"
Pattern = "{{date .timestamp}}: {{if ne ._title \"\"}}[ {{._title}} ] {{end}}{{ .short_message }}"

Contributing

You've developed a new cool feature? Fixed an annoying bug? We'd be happy to hear from you! Make sure to read CONTRIBUTING.md before.

License

This work is under the BSD license, see the LICENSE file for details.