@maiha maiha maiha

@maiha maiha / 0.25.md
Last active Jun 27, 2018
Crystal breaking changes
View 0.25.md

std

JSON

  • JSON::Type is moved to JSON::Any::Type
-  def [](key) : YAML::Type
+  def [](key) : YAML::Any::Type
@maiha maiha / 1.duck-typing-ok.md
Last active Jun 22, 2018
View 1.duck-typing-ok.md

[OK] 1.rb

require "json"

def convert_to_json(obj)
  obj.to_json
end

p convert_to_json(1)   # => "1"
p convert_to_json("x") # => "\"x\""
@maiha maiha / 0.kafkaのexactly once.md
Last active Apr 4, 2018
kafka-1.0-exactly-once
View 0.kafkaのexactly once.md

情報

概要

  • kafka-0.11 で導入された idempotent producer によって同一パーティション内の冪等性を保証
  • produce request v3 で導入された transaction 機能により、複数メッセージのアトミック処理を保証

チートシート（擬似コード）

@maiha maiha / 1.CompositeLogger.cr
Last active Dec 6, 2017
View 1.CompositeLogger.cr
class CompositeLogger
def initialize(@loggers : Array(Logger) = loggers)
end
macro method_missing(call)
@loggers.each do |logger|
logger.{{call}}
end
end
end
@maiha maiha / crystal-orm.md
Last active Apr 1, 2018
https://github.com/veelenga/awesome-crystal#ormodm-extensions
View crystal-orm.md

active_record.cr - Active Record pattern implementation

  • ⚠️ activity last commit is 1 year ago
  • MySQL driver : libmysql(C API)
  • ✅ agnostic FREE
  • ✅ define fields simple
  • ✅ table name supports camel class name
  • ⬜️ model level query lacks first, count
  • ❌ low level adapter hard to access
  • ⬜️ relations
  • ⚠️ multibytes can't set charset in default (needs monkey patch)
@maiha maiha / sbt-sonatype.md
Last active Nov 22, 2017
SBTでcross-buildingしてmavenにあげようとしたらエラーになった時の作業メモ
View sbt-sonatype.md

+ で全バージョン一気にやって欲しい

> + sonatypeRelease
[info] Setting version to 2.12.4
[info] Reapplying settings...
[info] Set current project to http-mock (in build file:/home/maiha/git/maiha/http-mock/)
[info] Nexus repository URL: https://oss.sonatype.org/service/local
[info] Reading staging repository profiles...
[error] Multiple repositories are found:
@maiha maiha / b.union.md
Last active Nov 8, 2017
complex return value in crystal
View b.union.md

implementation

enum Pcap::NextError
  EOF     = -2 # EOF or pcap_breakloop
  ERROR   = -1 #
  TIMEOUT =  0 # should be continued
end

class Pcap::Capture
@maiha maiha / 銀座のランチ.md
Last active Jul 10, 2017
View 銀座のランチ.md

アタックリスト

  • 牛庵（別）
  • びっくりうどん
  • 親子丼（◯勝）
  • 天丼（インズ）
  • 韓国料理（検校）
@maiha maiha / GaleraとGRのレプリケーションの違い.md
Last active Jul 15, 2018
Galera vs. Group Replication
View GaleraとGRのレプリケーションの違い.md
@maiha maiha / 0.md
Last active Jun 21, 2017
practical migrating guide to crystal-0.20.4
View 0.md