Rename env vars per Morph spec

Must start with MORPH_

README.md

@@ -25,9 +25,9 @@ According to the principle of _one codebase, many deploys_, this scraper is [con
 
 |Name|Purpose|Default|Required?|
 |------------------|-----------------------------------------|----------|
-|SCRAPER_DELAY     |Minimum delay in seconds between HTTP requests to the server.|10|No|
-|SCRAPER_USER_AGENT|User agent string sent as an HTTP request header.|_None_|Yes|
-|SCRAPER_LOG_LEVEL |Controls the level of detail in the output logs according to [Ruby's `Logger` class](https://ruby-doc.org/stdlib-2.1.0/libdoc/logger/rdoc/Logger.html) constants.|1 _(Logger::INFO)_|No|
+|MORPH_DELAY     |Minimum delay in seconds between HTTP requests to the server.|10|No|
+|MORPH_USER_AGENT|User agent string sent as an HTTP request header.|_None_|Yes|
+|MORPH_LOG_LEVEL |Controls the level of detail in the output logs according to [Ruby's `Logger` class](https://ruby-doc.org/stdlib-2.1.0/libdoc/logger/rdoc/Logger.html) constants.|1 _(Logger::INFO)_|No|
 
 ## Running
 

scraper.rb

@@ -17,13 +17,13 @@ def crawl_delay
   sleep DELAY_S
 end
 
-DELAY_S = ENV['SCRAPER_DELAY'].to_f || 10 # seconds. Conservatively slow by default. Scrapes approx 360 pages per hour.
-USER_AGENT = ENV['SCRAPER_USER_AGENT']
+DELAY_S = ENV['MORPH_DELAY'].to_f || 10 # seconds. Conservatively slow by default. Scrapes approx 360 pages per hour.
+USER_AGENT = ENV['MORPH_USER_AGENT']
 DATE_REGEX = /\d{2}-\d{2}-\d{4}/
 
 $stdout.sync = true # Flush output buffer after every write so log messages appear immediately.
 logger = Logger.new($stdout)
-logger.level = ENV['SCRAPER_LOG_LEVEL'].to_i || Logger::INFO
+logger.level = ENV['MORPH_LOG_LEVEL'].to_i || Logger::INFO
 logger.info "Scraper starts. Let's do this."
 logger.info "Delay between requests is #{DELAY_S} seconds."
 logger.info "User agent is: #{USER_AGENT}"