firehoseio/firehose

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lib/firehose/rack/consumer/web_socket.rb

Summary

Maintainability
A
1 hr
Test Coverage

Method subscribe has 26 lines of code (exceeds 25 allowed). Consider refactoring.
Open

          def subscribe(channel_name, last_sequence, params)
            chan_sub = Server::ChannelSubscription.new(
              channel_name,
              @ws.env,
              params: params,
Severity: Minor
Found in lib/firehose/rack/consumer/web_socket.rb - About 1 hr to fix

    Method message has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.
    Open

              def message(event)
                msg = parse_message(event)
    
                if subscriptions = msg[:multiplex_subscribe]
                  subscriptions = [subscriptions] unless subscriptions.is_a?(Array)
    Severity: Minor
    Found in lib/firehose/rack/consumer/web_socket.rb - About 25 mins to fix

    Cognitive Complexity

    Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

    A method's cognitive complexity is based on a few simple rules:

    • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
    • Code is considered more complex for each "break in the linear flow of the code"
    • Code is considered more complex when "flow breaking structures are nested"

    Further reading

    Method subscribe_multiplexed has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.
    Open

              def subscribe_multiplexed(subscriptions)
                channels = subscriptions.map{|s| s[:channel]}
                Firehose::Server.metrics.channels_subscribed_multiplexed_ws!(channels)
    
                subscriptions.each do |sub|
    Severity: Minor
    Found in lib/firehose/rack/consumer/web_socket.rb - About 25 mins to fix

    Cognitive Complexity

    Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

    A method's cognitive complexity is based on a few simple rules:

    • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
    • Code is considered more complex for each "break in the linear flow of the code"
    • Code is considered more complex when "flow breaking structures are nested"

    Further reading

    Use == if you meant to do a comparison or wrap the expression in parentheses to indicate you meant to assign in a condition.
    Open

                  if sub = @subscriptions[chan]

    This cop checks for assignments in the conditions of if/while/until.

    Example:

    # bad
    
    if some_var = true
      do_something
    end

    Example:

    # good
    
    if some_var == true
      do_something
    end

    Use == if you meant to do a comparison or wrap the expression in parentheses to indicate you meant to assign in a condition.
    Open

                if subscriptions = msg[:multiplex_subscribe]

    This cop checks for assignments in the conditions of if/while/until.

    Example:

    # bad
    
    if some_var = true
      do_something
    end

    Example:

    # good
    
    if some_var == true
      do_something
    end

    Useless assignment to variable - sequence. Use _ or _sequence as a variable name to indicate that it won't be used.
    Open

                  channel, sequence = sub[:channel]

    This cop checks for every useless assignment to local variable in every scope. The basic idea for this cop was from the warning of ruby -cw:

    assigned but unused variable - foo

    Currently this cop has advanced logic that detects unreferenced reassignments and properly handles varied cases such as branch, loop, rescue, ensure, etc.

    Example:

    # bad
    
    def some_method
      some_var = 1
      do_something
    end

    Example:

    # good
    
    def some_method
      some_var = 1
      do_something(some_var)
    end

    Unused method argument - event. If it's necessary, use _ or _event as an argument name to indicate that it won't be used. You can also write as close(*) if you want the method to accept any arguments but don't care about them.
    Open

              def close(event)

    This cop checks for unused method arguments.

    Example:

    # bad
    
    def some_method(used, unused, _unused_but_allowed)
      puts used
    end

    Example:

    # good
    
    def some_method(used, _unused, _unused_but_allowed)
      puts used
    end

    Unused method argument - event. If it's necessary, use _ or _event as an argument name to indicate that it won't be used. You can also write as open(*) if you want the method to accept any arguments but don't care about them.
    Open

              def open(event)

    This cop checks for unused method arguments.

    Example:

    # bad
    
    def some_method(used, unused, _unused_but_allowed)
      puts used
    end

    Example:

    # good
    
    def some_method(used, _unused, _unused_but_allowed)
      puts used
    end

    Use == if you meant to do a comparison or wrap the expression in parentheses to indicate you meant to assign in a condition.
    Open

                if channel_names = msg[:multiplex_unsubscribe]

    This cop checks for assignments in the conditions of if/while/until.

    Example:

    # bad
    
    if some_var = true
      do_something
    end

    Example:

    # good
    
    if some_var == true
      do_something
    end

    Unused method argument - event. If it's necessary, use _ or _event as an argument name to indicate that it won't be used. You can also write as open(*) if you want the method to accept any arguments but don't care about them.
    Open

              def open(event)

    This cop checks for unused method arguments.

    Example:

    # bad
    
    def some_method(used, unused, _unused_but_allowed)
      puts used
    end

    Example:

    # good
    
    def some_method(used, _unused, _unused_but_allowed)
      puts used
    end

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