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Ruby-API.md

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Ruby API

The following objects exist in Oxidized.

Input

  • gets config from nodes
  • must implement 'connect', 'get', 'cmd'
  • 'ssh', 'telnet', 'ftp', and 'tftp' implemented

Output

  • stores config
  • must implement 'store' (may implement 'fetch')
  • 'git' and 'file' (store as flat ascii) implemented

Source

  • gets list of nodes to poll
  • must implement 'load'
  • source can have 'name', 'model', 'group', 'username', 'password', 'input', 'output', 'prompt' for each device.
    • name - name of the device
    • model - model to use ('ios', 'junos', etc).The model is loaded dynamically by the first node of that model type. (Also default in config file)
    • input - method to acquire config, loaded dynamically as needed (Also default in config file)
    • output - method to store config, loaded dynamically as needed (Also default in config file)
    • prompt - prompt used for node (Also default in config file, can be specified in model too)
  • 'sql', 'csv' and 'http' (supports any format with single entry per line, like router.db)

Model

At the top level

A model may use several methods at the top level in the class. cfg is executed in input/output/source context. cmd is executed within an instance of the model.

cfg

cfg may be called with a list of methods (:ssh, :telnet) and a block with zero parameters. Calling cfg registers the given access methods and calling it at least once is required for a model to work.

The block may contain commands to change some behaviour for the given methods (e.g. calling post_login to disable the pager).

Supports monkey patching.

cmd

Is used to specify commands that should be executed on a model in order to gather its configuration. It can be called with:

  • Just a string
  • A string and a block
  • :all and a block
  • :secret and a block

The block takes a single parameter cfg containing the output of the command being processed.

Calling cmd with just a string will emit the output of the command given in that string as configuration.

Calling cmd with a string and a block will pass the output of the given command to the block, then emit its return value (that must be a string) as configuration.

Calling cmd with :all and a block will pass all command output through this block before emitting it. This is useful if some cleanup is required of the output of all commands.

Calling cmd with :secret and a block will pass all configuration to the given block before emitting it to hide secrets if secret hiding is enabled. The block should replace any secrets with '<hidden>' and return the resulting string.

Execution order is :all, :secret, and lastly the command specific block, if given.

Supports monkey patching.

comment

Called with a single string containing the string to prepend for comments in emitted configuration for this model.

If not specified the default of '# ' will be used (note the trailing space).

prompt

Is called with a regular expression that is used to detect when command output ends after a command has been executed.

If not specified, a default of /^([\w.@-]+[#>]\s?)$/ is used.

expect

Called with a regular expression and a block. The block takes two parameters: the regular expression, and the data containing the match.

The passed data is replaced by the return value of the block.

expect can be used to, for example, strip escape sequences from output before it's further processed.

Supports monkey patching.

At the second level

The following methods are available:

comment

Used inside cmd invocations. Comments out every line in the passed string and returns the result.

password

Used inside cfg invocations to specify the regular expression used to detect the password prompt. If not specified, the default of /^Password/ is used.

post_login

Used inside cfg invocations to specify commands to run once Oxidized has logged in to the device. Takes one argument that is either a block (taking zero parameters) or a string containing a command to execute.

This allows post_login to be used for any model-specific items prior to running the regular commands. This could include disabling the output pager or timestamp outputs that would cause constant differences.

Supports monkey patching.

pre_logout

Used to specify commands to run before Oxidized closes the connection to the device. Takes one argument that is either a block (taking zero parameters) or a string containing a command to execute.

This allows pre_logout to be used to 'undo' any changes that may have been needed via post_login (restore pager output, etc.)

Supports monkey patching.

send

Usually used inside expect or blocks passed to post_login/pre_logout. Takes a single parameter: a string to be sent to the device.

Monkey patching

Several model blocks accept behavior-modifying arguments that make monkey patching existing blocks easier. This is primarily useful when a user-supplied model aims to override or extend existing behavior of a model included in Oxidized.

This functionality is supported by cfg, cmd, pre_*, post_*, and expect blocks.

clear: true

Resets the existing block, allowing the user to completely override its contents.

prepend: true

Ensures that the contents of the block are prepended, rather than appended (the default) to an existing block.

String convenience methods

Since configuration processing tasks are occasionally similar across models, Oxidized provides an extended String class with the intention of providing convenience methods and eliminating code duplication.

cut_tail

Returns a multi-line string without the last line, or an empty string if only a single line was present.

cut_head

Returns a multi-line string without the first line, or an empty string if only a single line was present.

cut_both

Returns a multi-line string without the first and last lines, or an empty string if fewer than three lines were present.