class Log::Metadata

Overview

Immutable structured metadata information for logging.

See Log.context, Log.context=, Log::Context#clear, Log::Context#set, Log.with_context, and Log::Emitter.

NOTE If you'd like to format the context as JSON, remember to require "log/json".

Defined in:

log/metadata.cr

Constructors

Class Method Summary

Instance Method Summary

Instance methods inherited from class Reference

==(other : self)
==(other : JSON::Any)
==(other : YAML::Any)
==(other) ==, dup dup, hash(hasher) hash, initialize initialize, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference) : Bool
same?(other : Nil) same?, to_s(io : IO) : Nil to_s

Constructor methods inherited from class Reference

new new, unsafe_construct(address : Pointer, *args, **opts) : self unsafe_construct

Class methods inherited from class Reference

pre_initialize(address : Pointer) pre_initialize

Instance methods inherited from class Object

! : Bool !, !=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
===(other) ===, =~(other) =~, as(type : Class) as, as?(type : Class) as?, class class, dup dup, hash(hasher)
hash hash, in?(collection : Object) : Bool
in?(*values : Object) : Bool in?, inspect(io : IO) : Nil
inspect : String inspect, is_a?(type : Class) : Bool is_a?, itself itself, nil? : Bool nil?, not_nil!(message)
not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, responds_to?(name : Symbol) : Bool responds_to?, tap(&) tap, to_json(io : IO) : Nil
to_json : String to_json, to_pretty_json(indent : String = " ") : String
to_pretty_json(io : IO, indent : String = " ") : Nil to_pretty_json, to_s(io : IO) : Nil
to_s : String to_s, to_yaml(io : IO) : Nil
to_yaml : String to_yaml, try(&) try, unsafe_as(type : T.class) forall T unsafe_as

Class methods inherited from class Object

from_json(string_or_io, root : String)
from_json(string_or_io) from_json, from_yaml(string_or_io : String | IO) from_yaml

Macros inherited from class Object

class_getter(*names, &block) class_getter, class_getter!(*names) class_getter!, class_getter?(*names, &block) class_getter?, class_property(*names, &block) class_property, class_property!(*names) class_property!, class_property?(*names, &block) class_property?, class_setter(*names) class_setter, def_clone def_clone, def_equals(*fields) def_equals, def_equals_and_hash(*fields) def_equals_and_hash, def_hash(*fields) def_hash, delegate(*methods, to object) delegate, forward_missing_to(delegate) forward_missing_to, getter(*names, &block) getter, getter!(*names) getter!, getter?(*names, &block) getter?, property(*names, &block) property, property!(*names) property!, property?(*names, &block) property?, setter(*names) setter

Constructor Detail

def self.build(value : NamedTuple | Hash) : self #

Returns a Metadata with the information of the argument. Used to handle Log::Context#set and Log#Emitter.emit overloads.


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def self.build(value : Metadata) : Metadata #

Returns a Metadata with the information of the argument. Used to handle Log::Context#set and Log#Emitter.emit overloads.


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def self.new(parent : Metadata | Nil = nil, entries : NamedTuple | Hash = NamedTuple.new) #

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Class Method Detail

def self.empty : Log::Metadata #

Returns an empty Log::Metadata.

NOTE Since Log::Metadata is immutable, it's safe to share this instance.


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Instance Method Detail

def ==(other : Metadata) #

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def ==(other) #
Description copied from class Reference

Returns false (other can only be a Value here).


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def [](key : Symbol) : Value #

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def []?(key : Symbol) : Value | Nil #

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def dup : self #
Description copied from class Reference

Returns a shallow copy of this object.

This allocates a new object and copies the contents of self into it.


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def each(& : Tuple(Symbol, Value) -> ) #
Description copied from module Enumerable({Symbol, Log::Metadata::Value})

Must yield this collection's elements to the block.


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def empty? : Bool #
Description copied from module Enumerable({Symbol, Log::Metadata::Value})

Returns true if self does not contain any element.

([] of Int32).empty? # => true
([1]).empty?         # => false
[nil, false].empty?  # => false
  • #present? returns the inverse.

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def extend(other : NamedTuple | Hash) : Metadata #

Returns a Log::Metadata with all the entries of self and other. If a key is defined in both, the values in other are used.


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def fetch(key, &) #

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def hash(hasher) #
Description copied from class Reference

See Object#hash(hasher)


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def to_s(io : IO) : Nil #
Description copied from class Reference

Appends a short String representation of this object which includes its class name and its object address.

class Person
  def initialize(@name : String, @age : Int32)
  end
end

Person.new("John", 32).to_s # => #<Person:0x10a199f20>

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