Class: Google::Cloud::Debugger::BreakpointManager

Inherits:
Object
  • Object
show all
Includes:
MonitorMixin
Defined in:
lib/google/cloud/debugger/breakpoint_manager.rb

Overview

BreakpointManager

Responsible for querying Stackdriver Debugger service for any active breakpoints and keep an accurate local copies of the breakpoints.

It correctly remembers which breakpoints are currently active and watched by the debugger agent, and which breakpoints are already completed. The BreakpointManager holds the record of truth for debugger breakpoints

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#agent ⇒ Google::Cloud::Debugger::Agent (readonly)

The debugger agent this tracer belongs to

Returns:



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# File 'lib/google/cloud/debugger/breakpoint_manager.rb', line 39

def agent
  @agent
end

#app_root ⇒ String (readonly)

Application root directory, in absolute file path form.

Returns:

  • (String) 


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# File 'lib/google/cloud/debugger/breakpoint_manager.rb', line 48

def app_root
  @app_root
end

#on_breakpoints_change ⇒ Method

Callback function invoked when new breakpoints are added or removed

Returns:

  • (Method) 


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# File 'lib/google/cloud/debugger/breakpoint_manager.rb', line 53

def on_breakpoints_change
  @on_breakpoints_change
end

Instance Method Details

#active_breakpoints ⇒ Array<Google::Cloud::Debugger::Breakpoint>

Get a list of all active breakpoints.

Returns:



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# File 'lib/google/cloud/debugger/breakpoint_manager.rb', line 246

def active_breakpoints
  synchronize do
    @active_breakpoints
  end
end

#all_complete? ⇒ Boolean

Check whether any active breakpoints haven't been completed yet.

Returns:

  • (Boolean) —

    True if no more active breakpoints are left. False otherwise.



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# File 'lib/google/cloud/debugger/breakpoint_manager.rb', line 257

def all_complete?
  synchronize do
    @active_breakpoints.empty?
  end
end

#breakpoint_hit(breakpoint, call_stack_bindings) ⇒ Object

Evaluates a hit breakpoint, and submit the breakpoint to Transmitter if this breakpoint is evaluated successfully.

See Snappoint#evaluate and Logpoint#evaluate for evaluation details.

Parameters:

  • breakpoint (Google::Cloud::Debugger::Breakpoint) —

    The breakpoint to be evaluated

  • call_stack_bindings (Array<Binding>) —

    An array of Ruby Binding objects, from the each frame of the call stack that leads to the triggering of the breakpoints.



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# File 'lib/google/cloud/debugger/breakpoint_manager.rb', line 153

def breakpoint_hit breakpoint, call_stack_bindings
  breakpoint.evaluate call_stack_bindings

  case breakpoint.action
  when :CAPTURE
    # Take this completed breakpoint off manager's active breakpoints
    # list, submit the breakpoint snapshot, and update Tracer's
    # breakpoints_cache.

    return unless breakpoint.complete?

    # Remove this breakpoint from active list
    mark_off breakpoint
    # Signal transmitter to submit this breakpoint
    agent.transmitter.submit breakpoint
  when :LOG
    log_logpoint breakpoint
  end
end

#breakpoints ⇒ Array<Google::Cloud::Debugger::Breakpoint>

Get a list of all breakpoints, both active and completed.

Returns:



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# File 'lib/google/cloud/debugger/breakpoint_manager.rb', line 224

def breakpoints
  synchronize do
    @active_breakpoints | @completed_breakpoints
  end
end

#clear_breakpoints ⇒ Object

Clear local breakpoints cache. Remove all active and completed breakpoints



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# File 'lib/google/cloud/debugger/breakpoint_manager.rb', line 266

def clear_breakpoints
  synchronize do
    @active_breakpoints.clear
    @completed_breakpoints.clear
  end
end

#completed_breakpoints ⇒ Array<Google::Cloud::Debugger::Breakpoint>

Get a list of all completed breakpoints.

Returns:



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# File 'lib/google/cloud/debugger/breakpoint_manager.rb', line 235

def completed_breakpoints
  synchronize do
    @completed_breakpoints
  end
end

#log_logpoint(logpoint) ⇒ Object

Assume the given logpoint is successfully evaluated, log the evaluated log message via logger

Parameters:



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# File 'lib/google/cloud/debugger/breakpoint_manager.rb', line 179

def log_logpoint logpoint
  return unless agent.logger && logpoint.evaluated_log_message

  message = "LOGPOINT: #{logpoint.evaluated_log_message}"

  case logpoint.log_level
  when :INFO
    agent.logger.info message
  when :WARNING
    agent.logger.warn message
  when :ERROR
    agent.logger.error message
  end
end

#mark_off(breakpoint) ⇒ Google::Cloud::Debugger::Breakpoint, NilClass

Mark a given active breakpoint as completed. Meaning moving it from list of active breakpoints to completed breakpoints.

Parameters:

Returns:

  • (Google::Cloud::Debugger::Breakpoint, NilClass) —

    The same breakpoint if successfully marked off as completed. Nil if this breakpoint isn't found in the list of active breakpoints or failed to mark off as completed.



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# File 'lib/google/cloud/debugger/breakpoint_manager.rb', line 206

def mark_off breakpoint
  synchronize do
    breakpoint = @active_breakpoints.delete breakpoint

    if breakpoint.nil?
      nil
    else
      @completed_breakpoints << breakpoint
      breakpoint
    end
  end
end

#sync_active_breakpoints(debuggee_id) ⇒ Boolean

Sync active breakpoints with Stackdriver Debugger service for a given debuggee application. Each request to the debugger service returns the full list of all active breakpoints. This method makes sure the local cache of active breakpoints is consistent with server breakpoints set.

Parameters:

  • debuggee_id (String) —

    Debuggee application ID

Returns:

  • (Boolean) —

    True if synced successfully; otherwise false.



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# File 'lib/google/cloud/debugger/breakpoint_manager.rb', line 85

def sync_active_breakpoints debuggee_id
  begin
    response = service.list_active_breakpoints debuggee_id, @wait_token
  rescue
    return false
  end

  return true if response.wait_expired

  @wait_token = response.next_wait_token

  server_breakpoints =
    convert_grpc_breakpoints response.breakpoints || []

  update_breakpoints server_breakpoints

  true
end

#update_breakpoints(server_breakpoints) ⇒ Object

Update the local breakpoints cache with a list of server active breakpoints. New breakpoints will be added to local cache, and deleted breakpoints will be removed from local cache.

It also correctly identifies evaluated active breakpoints from the server set of breakpoints, and does not re-add such evaluated breakpoints to the active list again.

Parameters:



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# File 'lib/google/cloud/debugger/breakpoint_manager.rb', line 116

def update_breakpoints server_breakpoints
  synchronize do
    new_breakpoints =
      filter_breakpoints server_breakpoints - breakpoints

    before_breakpoints_count = breakpoints.size

    # Remember new active breakpoints from server
    @active_breakpoints += new_breakpoints unless new_breakpoints.empty?

    # Forget old breakpoints
    @completed_breakpoints &= server_breakpoints
    @active_breakpoints &= server_breakpoints
    after_breakpoints_acount = breakpoints.size

    breakpoints_updated =
      !new_breakpoints.empty? ||
      (before_breakpoints_count != after_breakpoints_acount)

    on_breakpoints_change.call(@active_breakpoints) if
      on_breakpoints_change.respond_to?(:call) && breakpoints_updated
  end
end