semlogger/lib/semlogger.rb

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require 'json'
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class Object
def to_semlogger
[self.class.name.to_sym, self.respond_to?( :serializable_hash) ? self.serializable_hash : self ]
end
end
class Exception
def to_semlogger
[:exception] + super
end
end
class String
def to_semlogger
[:String, self]
end
end
%w[Numeric FalseClass TrueClass NilClass].each do |cl|
Object.const_get( cl).class_eval do
def to_semlogger
[:const, self]
end
end
end
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class Semlogger < ::Logger
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class CustomType
attr_accessor :logger
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def initialize name, *obj
@name, @obj = name.to_s.to_sym, obj
end
def to_semlogger
[@name] + @obj
end
def add severity, progname = nil, &block
@logger.add severity, self, progname = nil, &block
end
::Semlogger::Severity.constants.each do |severity|
module_eval "def #{severity.downcase}( *a, &e) add #{::Semlogger::Severity.const_get severity}, *a, &e end", __FILE__, __LINE__
end
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end
attr_accessor :logdev, :level, :progname
class <<self
attr_accessor :progname
def custom( *a) CustomType.new *a end
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end
def custom *a
r = CustomType.new *a
r.logger = self
r
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end
@@progname = nil
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def initialize logdev = nil, *a, &e
case logdev
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when String, nil then logdev = ::Semlogger::Writer.new logdev
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end
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@progname = a[0] || @@progname
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@level, @data, @tags, @logdev = DEBUG, {}, [], logdev
end
def tagged *tags, &e
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@tags += tags
tags = tags.size
yield
ensure
tags.times { @tags.pop }
end
def add severity, message = nil, progname = nil, &block
severity ||= UNKNOWN
if @logdev.nil? or severity < @level
return true
end
progname ||= @progname
if message.nil?
if block_given?
message = yield
else
message = progname
progname = @progname
end
end
@logdev.add severity, Time.new, progname, format_data( @data), format_tags( @tags), format_msg( message)
end
def format_msg msg
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msg = msg.to_semlogger
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case msg
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when Array then msg
else [msg.class.name.to_sym, msg.inspect]
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end
end
def format_obj obj
case obj
when Proc then obj.call
else obj
end
end
def format_tags tags
tags = tags ? tags.dup : []
tags.map &method( :format_obj)
end
def format_data data
data = data ? data.dup : {}
data.each {|k,v| data[k] = format_obj v }
end
def data data, &e
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return @data unless e
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@data.update data
keys = data.keys
yield
ensure
keys.each &data.method( :delete)
end
def caller &e
data caller: Kernel.method(:caller), &e
end
def thread &e
data thread: Proc.new { Thread.current.object_id }, &e
end
end
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require 'semlogger/rotate'
require 'semlogger/multiplex'
require 'semlogger/rack'
require 'semlogger/filter'
require 'semlogger/writer'