I'm using rbox rye gem to run some tests to verify I can ping/connect to a host and then verify that certain directories/files exist on a host and then that a specific file is being uploaded to a host.
Most of the functionality is complete but one thing is missing and that is to verify I can actually connect to the host.
I use the following method to make the host connection.
The return value of the method is a connection string object (username#rye_10.16.11.100)
def connection()
con = Rye::Box.new("#{#host}")
con
end
Later in the code I want to validate that the connection succeeded:
if ((file.connection()) == #{HOST})
puts "Connected to Host"
else
puts "Not able to connect to Host"
end
However, the test fails with the following error:
gems/rye-0.9.12/lib/rye/box.rb:408:in `==': undefined method `host' for 0:Fixnum (NoMethodError)
from test_rye.rb:99:in `<main>'
I assume that the comparrisson operator is not valid to test for the returned rbox host object.
Is there a way that I can perform that comparrisson?
Thanks
Looks like your #host variable is holding a num instead of a hostname. Looking at the source code of Rye::Box, you can see that the comparison method is comparing the hostname that you initialised it with: https://github.com/delano/rye/blob/2d9ffd6d18688cc85ec1a004e35d12d8909b5ed6/lib/rye/box.rb#L408
I would take the following steps:
Add a debugger before con = Rye::Box.new("#{#host}") to check that the #host variable is actually a string.
If it is, add a debugger before if ((file.connection()) == #{HOST}) to see what file.connection returns.
As a side note, you should change #{HOST} to #host in that last statement; that's the correct way to access the instance variable.
Hopefully that'll shed some clarity to the problem!
Related
I'm new in ruby and I can't move forward from using login cred. from a yml file for a ruby project .I have a basic yml file
login:
urls:
gmail: "https://accounts.google.com/signin"
users:
username: something
password: something_new
I've created a yml.rb with require yml ,and access the yml path & loading the file .
But I don't know how to go through users/username ... in my test.rb :( .I've added in the "it " a variable to store the yml class and at the end i'm trying with
expect data['valid_user']
expect data['login']['urls']['gmail']
expect data['login']['users']['username']
but in the terminal I receive th error "NoMethodError: undefined method `[]' for nil:NilClass "
Update
Here is my yml.rb
require 'rspec'
require 'yaml'
class YamlHelper
#env = {}
def initialize
file = "#{Dir.pwd}path of yml file"
#env = YAML.load_file(file)
end
def get_variables
#env
end
end
Here is my test.rb file
describe 'My behaviour' do
before(:each) do
#browser = Selenium::WebDriver.for :firefox
end
it 'verifies yml login' do
yaml_helper = YamlHelper.new
data = yaml_helper.get_variables
expect data['valid_user']
expect test_data['login']['urls']['gmail']
expect test_data['login']['users']['username']
expect test_data['login']['users']['password']
end
after(:each) do #browser.quit
end
Can anyone take a look ?
thanks in advance
Have a lovely day
It looks like the code is almost there. When I'm debugging this sort of thing I'll often try to distil it down to the most basic test first
Something like:
require 'yaml'
file = "#{Dir.pwd}/data.yml"
data = YAML.load_file(file)
data['valid_user']
#=> nil
data['login']['urls']['gmail']
#=> "https://accounts.google.com/signin"
data['login']['users']['username']
#=> "something"
From the above you can see there's probably a typo in your test.rb file: test_data should most likely be data. Also, your YAML file doesn't contain the valid_user key, so you probably want to remove it from the test, at least for now.
The other two keys load fine.
The error you're seeing NoMethodError: undefined method '[]' for nil:NilClass means that one of the hashes you're variables you're treating like a hash is actually nil. This sort of bug is fairly common when you're diving into nested hashes. It means one of two things:
You've correctly descended into the hash, but the data is not present in the YAML.
The data is present in the YAML, but you're not getting to it correctly.
One change you can make that will make this code a bit more resilient is to replace:
test_data['login']['users']['username']
with:
test_data.dig('login', 'users', 'username')
The latter uses dig, which delves into the data structure and tries to return the value you're after, but if it gets a nil back at any point it'll just return nil, rather than throwing an exception.
Finally, for the test you've pasted here, you don't need the before(:each) or after(:each) blocks – Selenium is only necessary for browser testing.
I have something similar.
# MAIN.RB
require 'sockets'
require_relative 'replies.rb'
hostname = 'localhost'
port = 6500
s = TCPSocket.open(hostname, port)
$connected = 0
while line = s.gets # Read lines from the socket
#DO A BUNCH OF STUFF
if line == "Hi"
reply line
end
end
s.close
Then I have the reply function in a secondary file.
# REPLIES.RB
def reply(input)
if input == "Hi"
s.write("Hello my friend.\n"
end
end
However calling on the object s from the second file does not seem to work. How would I go about making this work. I'm new to Ruby. I've searched google for the answer, but the only results I have found is with sharing variables across files. I could always do a return "Hello my friend.\n", but I rather be able to write to the socket object directly from the function in REPLIES.rb
Remember that variables are strictly local unless you expressly pass them in. This means s only exists in the main context. You can fix this by passing it in:
reply(s, line)
And on the receiving side:
def reply(s, input)
# ...
end
I'd strongly encourage you to try and indent things consistently here, this code is really out of sorts, and avoid using global variables like $connected. Using a simple self-contained class you could clean up this code considerably.
Also, don't add .rb extensions when calling require. It's implied.
I'm looking to create a role based on host name prefix and I'm running into some problems. Ruby is new to me and although I've done extensive searching for a solution, I'm still confused.
Host names look like this:
work-server-01
home-server-01
Here's what I've written:
require 'facter'
Facter.add('host_role') do
setcode do
hostname_array = Facter.value(:hostname).split('-')
first_in_array = hostname_array.first
first_in_array.each do |x|
if x =~ /^(home|work)/
role = '"#{x}" server'
end
role
end
end
I'd like to use variable interpolation within my role assignment, but I feel like using a case statement along with 'when' is incorrect. Please keep in mind that I'm new to Ruby.
Would anybody have any ideas on how I might achieve my goal?
Pattern-Matching the Hostname Fact
The following is a relatively DRY refactoring of your code:
require 'facter'
Facter.add :host_role do
setcode do
location = case Facter.value(:hostname)
when /home/ then $&
when /work/ then $&
else 'unknown'
end
'%s server' % location
end
end
Mostly, it just looks for a regex match, and assigns the value of the match to location which is then returned as part of a formatted string.
On my system the hostname doesn't match either "home" or "work", so I correctly get:
Facter.value :host_role
#=> "unknown server"
I have a file: options.rb
I open IRB and type:
require './options.rb'
#=> true
Try to call a variable in the options file such as key (yes this variable is there and the file is saved)
NameError: undefined local variable or method `key' for main:Object
from (irb):2
Why is this not working? By the way also tried to load the file as: irb -r ./options.rb
UPDATE
Also tried to do load './options.rb' which does return #=> true but this also does not work.
From the require docs:
Any constants or globals within the loaded source file will be available in the calling program’s global namespace. However, local variables will not be propagated to the loading environment.
So if in options.rb you have something like:
key = something
(i.e. key is a local in the file) then it will not be available in irb. If you make it a global (e.g. $key = 'something') or a constant (e.g. KEY = 'something') it should be available.
If you do not like global variables (as matt suggested) you might also make it an instance variable of the object irb is running on (an instance of Object available through self as ruby always has an object it is operating on) you may also assign
#key='value'
in your file which will give you access to #key in your irb-session afterwards. This will work with either require as with load, but require will only load the file if it has not already done so while load will always execute the code in the file and thus will end up overwriting the contents of your variable if it has been changed in the mean time.
Ruby is a interpreted language, so for the interpreter to notice your declarations you need to actually 'run' them, the corresponding command in irb is
load './options.rb'
Here is one method that monkey patched the Dir[] method from autotest
class Dir
class << self
alias :old_index :[]
def [](*args)
$-w, old_warn = false, $-w
old_index(*args)
ensure
$-w = old_warn
end
end
end
Could you please help by explain this line $-w, old_warn = false, $-w ?
Thanks in advance.
You can assign multiple variables to multiple values on one line in Ruby.
That line is equivalent to the following:
old_warn = $-w
$-w = false
If you were asking what the purpose was; $-w is a global variable in Ruby that points to a boolean that indicates whether or not the user passed the -w flag to the ruby executable when they ran the script. In other words, the variable indicates whether or not the script/program is currently supposed to be printing "warnings".
Essentially, the purpose of that entire block of code is to ensure that warnings are turned off before executing it's core. The old value of the warn flag is saved into a new variable; the warn flag is turned off; and then when the execution is done, the warn flag is re-set back to whatever it used to be.