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ntu_course_crawler.rb
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ntu_course_crawler.rb
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# 國立臺灣大學
# 課程查詢網址：https://nol.ntu.edu.tw/nol/coursesearch/search_result.php
module CourseCrawler::Crawlers
class NtuCourseCrawler < CourseCrawler::Base
include ::CourseCrawler::DSL
DAYS = {
"一" => 1,
"二" => 2,
"三" => 3,
"四" => 4,
"五" => 5,
"六" => 6,
"日" => 7,
}
PERIODS = {
"0" => 1,
"1" => 2,
"2" => 3,
"3" => 4,
"4" => 5,
"5" => 6,
"6" => 7,
"7" => 8,
"8" => 9,
"9" => 10,
"10" => 11,
"A" => 12,
"B" => 13,
"C" => 14,
"D" => 15
}
def initialize year: current_year, term: current_term, update_progress: nil, after_each: nil, params: nil
@search_url = "http://nol.ntu.edu.tw/nol/coursesearch/search_result.php"
@base_url = "http://nol.ntu.edu.tw/nol/coursesearch/"
@year = year || current_year
@term = term || current_term
@update_progress_proc = update_progress
@after_each_proc = after_each
@encoding = 'big5'
end
def courses details: false, max_detail_count: 20_000
@courses = []
@threads = []
@failures = []
# 重設進度
@update_progress_proc.call(progress: 0.0) if @update_progress_proc
visit @search_url
puts "post search_url: #{@year-1911} - #{@term}"
visit "#{@search_url}?cstype=1¤t_sem=#{@year-1911}-#{@term}"
# pool = Thread.pool(ENV['MAX_THREADS'] && ENV['MAX_THREADS'].to_i || 25)
pages_param = @doc.xpath('//select[@name="jump"]//@value').map(&:value).uniq
@courses_processed_count = 0
@courses_count = @doc.css('table[cellpadding="4"] tbody tr td font[color="#CC0033"]').text.to_i
# @total_page_count = pages_param.count
puts "total pages: #{pages_param.count}"
done_page_count = 0
pages_param.each do |query|
# pool.process(query) do
sleep(1) until (
@threads.delete_if { |t| !t.status }; # remove dead (ended) threads
@threads.count < (ENV['MAX_THREADS'] || 25)
)
@threads << Thread.new do
# puts "get page url"
retry_count = 0; success = false
begin
r = RestClient.get "#{@search_url}#{query}"
rescue Exception => e
@failures << "#{@search_url}#{query}"
next
end
# puts "parse page"
doc = Nokogiri::HTML(r.force_encoding(@encoding))
# row_count = doc.xpath('/html/body/table[4]//tr[position()>1]').count
# puts "row_count: #{row_count}"
# @total_row_count += row_count
doc.xpath('/html/body/table[4]//tr[position()>1]').each do |row|
datas = row.css('td')
course_days = []
course_periods = []
course_locations = []
# results = [["一", "12", "請洽系所辦"], ["四", "12", "請洽系所辦"]]
results = datas[11] && datas[11].text.scan(/(?<d>[#{DAYS.keys.join}])(?<p>([#{PERIODS.keys.join}],?)+)(\((?<loc>[^\)]+)\))/)
results.each do |re|
re[1].split(",").each do |p|
course_days << DAYS[re[0]]
course_periods << PERIODS[p]
course_locations << re[2]
end
end
name = datas[4] && power_strip(datas[4].text)
lecturer = datas[9] && power_strip(datas[9].text)
department = datas[1] && power_strip(datas[1].text)
url = nil || datas[4] && !datas[4].css('a').empty? && URI.encode("#{@base_url}#{datas[4].css('a')[0][:href]}")
id = datas[6] && power_strip(datas[6].text).gsub(/\s/, '')
class_code= datas[3] && power_strip(datas[3].text)
department_code = url ? Hash[URI.decode_www_form(URI.encode url)]["dpt_code"] : nil
number = datas[2] && power_strip(datas[2].text)
code = [@year, @term, id, number, department_code, class_code].join('-')
course = {
year: @year,
term: @term,
serial: datas[0] && power_strip(datas[0].text),
department: department,
department_code: department_code,
number: number,
code: code,
class_code: class_code,
name: name,
credits: datas[5] && datas[5].text.to_i,
general_code: id,
required: datas[8] && datas[8].text.include?('必'),
lecturer: lecturer,
day_1: course_days[0],
day_2: course_days[1],
day_3: course_days[2],
day_4: course_days[3],
day_5: course_days[4],
day_6: course_days[5],
day_7: course_days[6],
day_8: course_days[7],
day_9: course_days[8],
period_1: course_periods[0],
period_2: course_periods[1],
period_3: course_periods[2],
period_4: course_periods[3],
period_5: course_periods[4],
period_6: course_periods[5],
period_7: course_periods[6],
period_8: course_periods[7],
period_9: course_periods[8],
location_1: course_locations[0],
location_2: course_locations[1],
location_3: course_locations[2],
location_4: course_locations[3],
location_5: course_locations[4],
location_6: course_locations[5],
location_7: course_locations[6],
location_8: course_locations[7],
location_9: course_locations[8],
url: url
}
@courses << course
# callbacks
@after_each_proc.call(course: course) if @after_each_proc
# update the progress
@update_progress_proc.call( progress: @courses_processed_count.to_f / @courses_count.to_f) if @update_progress_proc
@courses_processed_count += 1
# puts "done: #{@courses_processed_count}"
# puts "total_row_count: #{@total_row_count}"
end # each tr row
# @processed_page_count += 1
done_page_count += 1
# print "#{done_page_count}\n"
set_progress "#{done_page_count} / #{pages_param.count}"
print "#{done_page_count} / #{pages_param.count}\n"
# puts "processed_page_count: #{@processed_page_count} / #{@total_page_count}"
end # Thread.new do
end # pages_param.each
# pool.shutdown
ThreadsWait.all_waits(*@threads)
puts "done #{@courses.count} courses!"
@courses
end # def course
def power_strip str
str.strip.gsub(/^[ |\s]*|[ |\s]*$/,'')
end
end
end