眠気.jl

投稿=不定期

Juliaでスクレイピング 1/m

JuliaでGETとかしたい(with HTTP.jl)

動機

元ネタのJulia本の方だと、英語のwikiなので,日本語もやってみたくなった

目標

JuliaでJuliaの日本語wikiを読む
つまり、ここに行って、中身取得してくる

作業環境

今回の環境(前回同様)

julia> versioninfo()
Julia Version 1.1.0
...

やってみる

julia>
(v1.1) pkg> add HTTP
julia> edit("first_http.jl")

次の様に編集する

using HTTP

Julia言語のページ☆😺☆="https://ja.wikipedia.org/wiki/Julia_(%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%9F%E3%83%B3%E3%82%B0%E8%A8%80%E8%AA%9E)"
ja_wiki = HTTP.get(Julia言語のページ☆😺☆)
println(ja_wiki)
println(typeof(ja_wiki))
println(fieldnames(typeof(ja_wiki)))

実行してみると,

shell> julia http.jl
HTTP.Messages.Response:
"""
HTTP/1.1 200 OK
Date: Tue, 26 Feb 2019 10:48:28 GMT
Content-Type: text/html; charset=UTF-8
...(ここすごい長いので略)
<!DOCTYPE html>
<html class="client-nojs" lang="ja" dir="ltr">
<head>
<meta charset="UTF-8"/>
<title>Julia (プログラミング言語) - Wikipedia</title>
<script>document.documentElement.className = document.documentElement.className.replace( /(^|\s)client-nojs(\s|$)/, "$1client-js$2" );</script>
<script>(window.RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgCanonicalNamespace":"","wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"Julia_(プログラミング言語)","wgTitle":"Julia (プログラミング言語)","wgCurRevisionId":71653479,"wgRevisionId":71653479,"wgArticleId":2911591,"wgIsArticle":true,"wgIsRedirect":false,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgCategories":["ウィキペディアとウィキデータで異なる公式ウェブサイト","FLOSS関連のスタブ項目","オブジェクト指向言語","数値線形代数","並列コンピューティング","プログラミング言語","Linux向け数値解析ソフ
77561-byte body
"""
HTTP.Messages.Response
(:version, :status, :headers, :body, :request)

と帰ってくる
HTTP.Messages.Responseという形で帰ってくることがわかる
(fieldnames=filedの名前をタプルでとってくる関数)
body以外を順番に見る,次のように書き換えてから実行

using HTTP

Julia言語のページ☆😺☆="https://ja.wikipedia.org/wiki/Julia_(%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%9F%E3%83%B3%E3%82%B0%E8%A8%80%E8%AA%9E)"
ja_wiki = HTTP.get(Julia言語のページ☆😺☆)
println(ja_wiki)

println(ja_wiki.version)
println(ja_wiki.status)
println(ja_wiki.headers)
#println(ja_wiki.body)
println(ja_wiki.request)

すると

HTTP.Messages.Response:
"""
HTTP/1.1 200 OK
Date: Tue, 26 Feb 2019 11:16:51 GMT
Content-Type: text/html; charset=UTF-8
Content-Length: 77561
Connection: keep-alive
Server: mw1268.eqiad.wmnet
X-Content-Type-Options: nosniff
P3P: CP="This is not a P3P policy! See https://ja.wikipedia.org/wiki/%E7%89%B9%E5%88%A5:CentralAutoLogin/P3P for more info."
X-Powered-By: HHVM/3.18.6-dev
Content-language: ja
Last-Modified: Sun, 24 Feb 2019 18:56:33 GMT
Backend-Timing: D=116477 t=1551045681198724
Vary: Accept-Encoding,Cookie,Authorization,X-Seven
X-Varnish: 491791512 489799321, 1005959020, 232551754, 72497187 690231799
Via: 1.1 varnish (Varnish/5.1), 1.1 varnish (Varnish/5.1), 1.1 varnish (Varnish/5.1), 1.1 varnish (Varnish/5.1)
Age: 51391
X-Cache: cp1085 hit/9, cp2012 pass, cp5007 miss, cp5009 hit/35
X-Cache-Status: hit-front
Server-Timing: cache;desc="hit-front"
Strict-Transport-Security: max-age=106384710; includeSubDomains; preload
Set-Cookie: WMF-Last-Access=26-Feb-2019;Path=/;HttpOnly;secure;Expires=Sat, 30 Mar 2019 00:00:00 GMT
Set-Cookie: WMF-Last-Access-Global=26-Feb-2019;Path=/;Domain=.wikipedia.org;HttpOnly;secure;Expires=Sat, 30 Mar 2019 00:00:00 GMT
X-Analytics: ns=0;page_id=2911591;https=1;nocookies=1
X-Client-IP: 111.239.190.1
Cache-Control: private, s-maxage=0, max-age=0, must-revalidate
Set-Cookie: GeoIP=JP:13:Tokyo:35.70:139.67:v4; Path=/; secure; Domain=.wikipedia.org
Accept-Ranges: bytes

<!DOCTYPE html>
<html class="client-nojs" lang="ja" dir="ltr">
<head>
<meta charset="UTF-8"/>
<title>Julia (プログラミング言語) - Wikipedia</title>
<script>document.documentElement.className = document.documentElement.className.replace( /(^|\s)client-nojs(\s|$)/, "$1client-js$2" );</script>
<script>(window.RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgCanonicalNamespace":"","wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"Julia_(プログラミング言語)","wgTitle":"Julia (プログラミング言語)","wgCurRevisionId":71653479,"wgRevisionId":71653479,"wgArticleId":2911591,"wgIsArticle":true,"wgIsRedirect":false,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgCategories":["ウィキペディアとウィキデータで異なる公式ウェブサイト","FLOSS関連のスタブ項目","オブジェクト指向言語","数値線形代数","並列コンピューティング","プログラミング言語","Linux向け数値解析ソフ�
⋮
77561-byte body
"""
1.1.0
200
Pair{SubString{String},SubString{String}}["Date"=>"Tue, 26 Feb 2019 11:16:51 GMT", "Content-Type"=>"text/html; charset=UTF-8", "Content-Length"=>"77561", "Connection"=>"keep-alive", "Server"=>"mw1268.eqiad.wmnet", "X-Content-Type-Options"=>"nosniff", "P3P"=>"CP=\"This is not a P3P policy! See https://ja.wikipedia.org/wiki/%E7%89%B9%E5%88%A5:CentralAutoLogin/P3P for more info.\"", "X-Powered-By"=>"HHVM/3.18.6-dev", "Content-language"=>"ja", "Last-Modified"=>"Sun, 24 Feb 2019 18:56:33 GMT", "Backend-Timing"=>"D=116477 t=1551045681198724", "Vary"=>"Accept-Encoding,Cookie,Authorization,X-Seven", "X-Varnish"=>"491791512 489799321, 1005959020, 232551754, 72497187 690231799", "Via"=>"1.1 varnish (Varnish/5.1), 1.1 varnish (Varnish/5.1), 1.1 varnish (Varnish/5.1), 1.1 varnish (Varnish/5.1)", "Age"=>"51391", "X-Cache"=>"cp1085 hit/9, cp2012 pass, cp5007 miss, cp5009 hit/35", "X-Cache-Status"=>"hit-front", "Server-Timing"=>"cache;desc=\"hit-front\"", "Strict-Transport-Security"=>"max-age=106384710; includeSubDomains; preload", "Set-Cookie"=>"WMF-Last-Access=26-Feb-2019;Path=/;HttpOnly;secure;Expires=Sat, 30 Mar 2019 00:00:00 GMT", "Set-Cookie"=>"WMF-Last-Access-Global=26-Feb-2019;Path=/;Domain=.wikipedia.org;HttpOnly;secure;Expires=Sat, 30 Mar 2019 00:00:00 GMT", "X-Analytics"=>"ns=0;page_id=2911591;https=1;nocookies=1", "X-Client-IP"=>"111.239.190.1", "Cache-Control"=>"private, s-maxage=0, max-age=0, must-revalidate", "Set-Cookie"=>"GeoIP=JP:13:Tokyo:35.70:139.67:v4; Path=/; secure; Domain=.wikipedia.org", "Accept-Ranges"=>"bytes"]
HTTP.Messages.Request:
"""
GET /wiki/Julia_(%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%9F%E3%83%B3%E3%82%B0%E8%A8%80%E8%AA%9E) HTTP/1.1
Host: ja.wikipedia.org
Content-Length: 0

"""

と帰ってくる,bodyを見てみると

HTTP.Messages.Response:
"""
HTTP/1.1 200 OK
Date: Tue, 26 Feb 2019 11:20:59 GMT
Content-Type: text/html; charset=UTF-8
Content-Length: 77561
Connection: keep-alive
Server: mw1268.eqiad.wmnet
X-Content-Type-Options: nosniff
P3P: CP="This is not a P3P policy! See https://ja.wikipedia.org/wiki/%E7%89%B9%E5%88%A5:CentralAutoLogin/P3P for more info."
X-Powered-By: HHVM/3.18.6-dev
Content-language: ja
Last-Modified: Sun, 24 Feb 2019 18:56:33 GMT
Backend-Timing: D=116477 t=1551045681198724
Vary: Accept-Encoding,Cookie,Authorization,X-Seven
X-Varnish: 491791512 489799321, 1005959020, 232551754, 84021737 690231799
Via: 1.1 varnish (Varnish/5.1), 1.1 varnish (Varnish/5.1), 1.1 varnish (Varnish/5.1), 1.1 varnish (Varnish/5.1)
Age: 51639
X-Cache: cp1085 hit/9, cp2012 pass, cp5007 miss, cp5009 hit/37
X-Cache-Status: hit-front
Server-Timing: cache;desc="hit-front"
Strict-Transport-Security: max-age=106384710; includeSubDomains; preload
Set-Cookie: WMF-Last-Access=26-Feb-2019;Path=/;HttpOnly;secure;Expires=Sat, 30 Mar 2019 00:00:00 GMT
Set-Cookie: WMF-Last-Access-Global=26-Feb-2019;Path=/;Domain=.wikipedia.org;HttpOnly;secure;Expires=Sat, 30 Mar 2019 00:00:00 GMT
X-Analytics: ns=0;page_id=2911591;https=1;nocookies=1
X-Client-IP: 111.239.190.1
Cache-Control: private, s-maxage=0, max-age=0, must-revalidate
Set-Cookie: GeoIP=JP:13:Tokyo:35.70:139.67:v4; Path=/; secure; Domain=.wikipedia.org
Accept-Ranges: bytes

<!DOCTYPE html>
<html class="client-nojs" lang="ja" dir="ltr">
<head>
<meta charset="UTF-8"/>
<title>Julia (プログラミング言語) - Wikipedia</title>
<script>document.documentElement.className = document.documentElement.className.replace( /(^|\s)client-nojs(\s|$)/, "$1client-js$2" );</script>
<script>(window.RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgCanonicalNamespace":"","wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"Julia_(プログラミング言語)","wgTitle":"Julia (プログラミング言語)","wgCurRevisionId":71653479,"wgRevisionId":71653479,"wgArticleId":2911591,"wgIsArticle":true,"wgIsRedirect":false,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgCategories":["ウィキペディアとウィキデータで異なる公式ウェブサイト","FLOSS関連のスタブ項目","オブジェクト指向言語","数値線形代数","並列コンピューティング","プログラミング言語","Linux向け数値解析ソフ�
⋮
77561-byte body
"""
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...(略)
]

となり,取得は出来ている模様

感想

課題が2つ浮かんだので、良かった

1.fieldsnameでとったfieldに:がつく問題(これがなければforで回せた)

eg):status,:body これ:を取りたい

2.bodyで取得したUInt8配列を文字列に直したい

楽しかった

参考にしたURL,書籍

Julia Programming Projects: Learn Julia 1.x by building apps for data analysis, visualization, machine learning, and the web (English Edition)