From 57140b80f00aab43918a3ec3276062823971dec7 Mon Sep 17 00:00:00 2001
From: Azul <azul@riseup.net>
Date: Tue, 10 Sep 2013 09:44:38 +0200
Subject: bringing over couch_changes from leap_ca including tests

---
 lib/tapicero/config.rb        | 69 +++++++++++++++++++++++++++++++++++++++++++
 lib/tapicero/couch_changes.rb | 19 ++++++++++++
 lib/tapicero/couch_stream.rb  | 25 ++++++++++++++++
 3 files changed, 113 insertions(+)
 create mode 100644 lib/tapicero/config.rb
 create mode 100644 lib/tapicero/couch_changes.rb
 create mode 100644 lib/tapicero/couch_stream.rb

(limited to 'lib/tapicero')

diff --git a/lib/tapicero/config.rb b/lib/tapicero/config.rb
new file mode 100644
index 0000000..cb22792
--- /dev/null
+++ b/lib/tapicero/config.rb
@@ -0,0 +1,69 @@
+require 'yaml'
+
+module Tapicero
+  module Config
+    extend self
+
+    attr_accessor :users_db_name
+    attr_accessor :db_prefix
+    attr_accessor :couch_connection
+
+    def self.load(base_dir, *configs)
+      configs.each do |file_path|
+        load_config find_file(base_dir, file_path)
+      end
+    end
+
+    # TODO: enable username and password
+    def couch_host
+      couch_connection[:protocol] + '://' +
+        couch_connection[:host] + ':' +
+        couch_connection[:port] + '/'
+    end
+
+    private
+
+    def load_config(file_path)
+      return unless file_path
+      puts " * Loading configuration #{file_path}"
+      load_settings YAML.load(File.read(file_path))
+    rescue NoMethodError => exc
+      STDERR.puts "ERROR in file #{file_path}"
+      exit(1)
+    end
+
+    def load_settings(hash)
+      return unless hash
+      hash.each do |key, value|
+        apply_setting(key, value)
+      end
+    end
+
+    def apply_setting(key, value)
+      if value.is_a? Hash
+        value = symbolize_keys(value)
+      end
+      self.send("#{key}=", value)
+    rescue NoMethodError => exc
+      STDERR.puts "'#{key}' is not a valid option"
+      raise exc
+    end
+
+    def self.symbolize_keys(hsh)
+      newhsh = {}
+      hsh.keys.each do |key|
+        newhsh[key.to_sym] = hsh[key]
+      end
+      newhsh
+    end
+
+    def self.find_file(base_dir, file_path)
+      return nil unless file_path
+      if defined? CWD
+        return File.expand_path(file_path, CWD)  if File.exists?(File.expand_path(file_path, CWD))
+      end
+      return File.expand_path(file_path, base_dir) if File.exists?(File.expand_path(file_path, base_dir))
+      return nil
+    end
+  end
+end
diff --git a/lib/tapicero/couch_changes.rb b/lib/tapicero/couch_changes.rb
new file mode 100644
index 0000000..2e668dc
--- /dev/null
+++ b/lib/tapicero/couch_changes.rb
@@ -0,0 +1,19 @@
+module Tapicero
+  class CouchChanges
+    def initialize(stream)
+      @stream = stream
+    end
+
+    def last_seq
+      @stream.get "_changes", :limit => 1, :descending => true do |hash|
+        return hash[:last_seq]
+      end
+    end
+
+    def follow
+      @stream.get "_changes", :feed => :continuous, :since => last_seq do |hash|
+        yield(hash)
+      end
+    end
+  end
+end
diff --git a/lib/tapicero/couch_stream.rb b/lib/tapicero/couch_stream.rb
new file mode 100644
index 0000000..96c752a
--- /dev/null
+++ b/lib/tapicero/couch_stream.rb
@@ -0,0 +1,25 @@
+require 'yajl/http_stream'
+
+module Tapicero
+  class CouchStream
+    def initialize(database_url)
+      @database_url = database_url
+    end
+
+    def get(path, options)
+      url = url_for(path, options)
+      # puts url
+      Yajl::HttpStream.get(url, :symbolize_keys => true) do |hash|
+        yield(hash)
+      end
+    end
+
+    protected
+
+    def url_for(path, options = {})
+      url = [@database_url, path].join('/')
+      url += '?' if options.any?
+      url += options.map {|k,v| "#{k}=#{v}"}.join('&')
+    end
+  end
+end
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