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#!/usr/bin/env ruby
# Parses a file descriptor log as produced by Passenger,
# and display the file descriptors that are still open
# according to the log.
class ParserApp
Agent = Struct.new(:name, :fds)
Entry = Struct.new(:source, :purpose)
def initialize(path)
@io = File.open(path, "r")
@agents = {}
end
def close
@io.close
end
def analyze
@lineno = 1
while !@io.eof?
line = @io.readline.strip
pid, source, message = parse_line(line)
case message
when /^Starting agent: (.+)$/
agent_name = $1
if (old_pid = find_agent(agent_name))
warn "#{agent_name} restarted"
@agents.delete(old_pid)
end
@agents[pid] = Agent.new(agent_name, {})
when /^File descriptor opened: (.+)/
fd = $1.to_i
if agent = @agents[pid]
if agent.fds.has_key?(fd)
warn "FD #{fd} already opened"
end
agent.fds[fd] = Entry.new(source)
else
warn "No agent information about #{pid}"
end
when /^File descriptor closed: (.+)/
fd = $1.to_i
if agent = @agents[pid]
if agent.fds.has_key?(fd)
agent.fds.delete(fd)
else
warn "FD #{fd} not opened"
end
else
warn "No agent information about #{pid}"
end
when /^File descriptor purpose: (.+?): (.+)/
fd = $1.to_i
purpose = $2
if agent = @agents[pid]
if entry = agent.fds[fd]
entry.purpose = purpose
else
warn "FD #{fd} not opened"
end
else
warn "No agent information about #{pid}"
end
end
@lineno += 1
end
rescue EOFError
end
def report
@agents.each_pair do |pid, agent|
puts
puts "#{pid}: #{agent.name}"
puts("-" * 80)
agent.fds.keys.sort.each do |fd|
entry = agent.fds[fd]
printf "%-5d %-30s %s\n", fd, entry.source, entry.purpose
end
end
end
private
def parse_line(line)
if line =~ /^\[ (.+?) \]: (.+)/
info = $1
message = $2
fragments = info.split(" ")
pid = fragments[2].sub(/\/.*/, '')
source = fragments.last
[pid, source, message]
else
nil
end
end
def find_agent(name)
@agents.each_pair do |pid, agent|
if agent.name == name
return pid
end
end
nil
end
def warn(message)
STDERR.puts "Warning:#{@lineno}: #{message}"
end
end
app = ParserApp.new(ARGV[0])
app.analyze
app.report
app.close