couchrest_model/lib/couchrest/helper/file_manager.rb

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require 'digest/md5'
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module CouchRest
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class FileManager
attr_reader :db
attr_accessor :loud
LANGS = {"rb" => "ruby", "js" => "javascript"}
MIMES = {
"html" => "text/html",
"htm" => "text/html",
"png" => "image/png",
"css" => "text/css",
"js" => "test/javascript"
}
def initialize(dbname, host="http://localhost:5984")
@db = CouchRest.new(host).database(dbname)
end
def push_directory(push_dir, docid=nil)
docid ||= push_dir.split('/').reverse.find{|part|!part.empty?}
pushfiles = Dir["#{push_dir}/**/*.*"].collect do |f|
{f.split("#{push_dir}/").last => open(f).read}
end
return if pushfiles.empty?
@attachments = {}
@signatures = {}
pushfiles.each do |file|
name = file.keys.first
value = file.values.first
@signatures[name] = md5(value)
@attachments[name] = {
"data" => value,
"content_type" => MIMES[name.split('.').last]
}
end
doc = @db.get(docid) rescue nil
unless doc
say "creating #{docid}"
@db.save({"_id" => docid, "_attachments" => @attachments, "signatures" => @signatures})
return
end
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doc["signatures"] ||= {}
doc["_attachments"] ||= {}
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# remove deleted docs
to_be_removed = doc["signatures"].keys.select do |d|
!pushfiles.collect{|p| p.keys.first}.include?(d)
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end
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to_be_removed.each do |p|
say "deleting #{p}"
doc["signatures"].delete(p)
doc["_attachments"].delete(p)
end
# update existing docs:
doc["signatures"].each do |path, sig|
if (@signatures[path] == sig)
say "no change to #{path}. skipping..."
else
say "replacing #{path}"
doc["signatures"][path] = md5(@attachments[path]["data"])
doc["_attachments"][path].delete("stub")
doc["_attachments"][path].delete("length")
doc["_attachments"][path]["data"] = @attachments[path]["data"]
doc["_attachments"][path].merge!({"data" => @attachments[path]["data"]} )
end
end
# add in new files
new_files = pushfiles.select{|d| !doc["signatures"].keys.include?( d.keys.first) }
new_files.each do |f|
say "creating #{f}"
path = f.keys.first
content = f.values.first
doc["signatures"][path] = md5(content)
doc["_attachments"][path] = {
"data" => content,
"content_type" => MIMES[path.split('.').last]
}
end
begin
@db.save(doc)
rescue Exception => e
say e.message
end
end
def push_views(view_dir)
designs = {}
Dir["#{view_dir}/**/*.*"].each do |design_doc|
design_doc_parts = design_doc.split('/')
next if /^lib\..*$/.match design_doc_parts.last
pre_normalized_view_name = design_doc_parts.last.split("-")
view_name = pre_normalized_view_name[0..pre_normalized_view_name.length-2].join("-")
folder = design_doc_parts[-2]
designs[folder] ||= {}
designs[folder]["views"] ||= {}
design_lang = design_doc_parts.last.split(".").last
designs[folder]["language"] ||= LANGS[design_lang]
libs = ""
Dir["#{view_dir}/lib.#{design_lang}"].collect do |global_lib|
libs << open(global_lib).read
libs << "\n"
end
Dir["#{view_dir}/#{folder}/lib.#{design_lang}"].collect do |global_lib|
libs << open(global_lib).read
libs << "\n"
end
if design_doc_parts.last =~ /-map/
designs[folder]["views"]["#{view_name}-map"] ||= {}
designs[folder]["views"]["#{view_name}-map"]["map"] = read(design_doc, libs)
designs[folder]["views"]["#{view_name}-reduce"] ||= {}
designs[folder]["views"]["#{view_name}-reduce"]["map"] = read(design_doc, libs)
end
if design_doc_parts.last =~ /-reduce/
designs[folder]["views"]["#{view_name}-reduce"] ||= {}
designs[folder]["views"]["#{view_name}-reduce"]["reduce"] = read(design_doc, libs)
end
end
# cleanup empty maps and reduces
designs.each do |name, props|
props["views"].each do |view, funcs|
next unless view.include?("reduce")
props["views"].delete(view) unless funcs.keys.include?("reduce")
end
end
designs.each do |k,v|
create_or_update("_design/#{k}", v)
end
designs
end
def pull_views(view_dir)
prefix = "_design"
ds = db.documents(:startkey => '#{prefix}/', :endkey => '#{prefix}/ZZZZZZZZZ')
ds['rows'].collect{|r|r['id']}.each do |id|
puts directory = id.split('/').last
FileUtils.mkdir_p(File.join(view_dir,directory))
views = db.get(id)['views']
vgroups = views.keys.group_by{|k|k.sub(/\-(map|reduce)$/,'')}
vgroups.each do|g,vs|
mapname = vs.find {|v|views[v]["map"]}
if mapname
# save map
mapfunc = views[mapname]["map"]
mapfile = File.join(view_dir, directory, "#{g}-map.js") # todo support non-js views
File.open(mapfile,'w') do |f|
f.write mapfunc
end
end
reducename = vs.find {|v|views[v]["reduce"]}
if reducename
# save reduce
reducefunc = views[reducename]["reduce"]
reducefile = File.join(view_dir, directory, "#{g}-reduce.js") # todo support non-js views
File.open(reducefile,'w') do |f|
f.write reducefunc
end
end
end
end
end
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def push_app(appdir, appname)
libs = []
viewdir = File.join(appdir,"views")
attachdir = File.join(appdir,"attachments")
views, lang = read_design_views(viewdir)
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# attachments = read_attachments(attachdir)
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docid = "_design/#{appname}"
design = @db.get(docid) rescue {}
design['_id'] = docid
design['views'] = views
design['language'] = lang
@db.save(design)
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push_directory(attachdir, docid)
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# puts views.inspect
end
# Generate an application in the given directory.
# This is a class method because it doesn't depend on
# specifying a database.
def self.generate_app(app_dir)
FileUtils.mkdir_p(app_dir)
FileUtils.mkdir_p(File.join(app_dir,"attachments"))
FileUtils.mkdir_p(File.join(app_dir,"views"))
index_template = File.join(File.expand_path(File.dirname(__FILE__)), 'templates','index.html')
index_dest = File.join(app_dir,"attachments","index.html")
FileUtils.cp(index_template, index_dest)
map_template = File.join(File.expand_path(File.dirname(__FILE__)), 'templates','example-map.js')
map_dest = File.join(app_dir,"views","example-map.js")
FileUtils.cp(map_template, map_dest)
rereduce_template = File.join(File.expand_path(File.dirname(__FILE__)), 'templates','example-reduce.js')
rereduce_dest = File.join(app_dir,"views","example-reduce.js")
FileUtils.cp(rereduce_template, rereduce_dest)
end
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private
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def read_design_views(viewdir)
libs = []
language = nil
views = {}
Dir["#{viewdir}/*.*"].each do |viewfile|
view_parts = viewfile.split('/')
viewfile_name = view_parts.last
# example-map.js
viewfile_name_parts = viewfile_name.split('.')
viewfile_ext = viewfile_name_parts.last
view_name_parts = viewfile_name_parts.first.split('-')
func_type = view_name_parts.pop
view_name = view_name_parts.join('-')
contents = File.open(viewfile).read
if /^lib\..*$/.match viewfile_name
libs.push(contents)
else
views[view_name] ||= {}
language = LANGS[viewfile_ext]
views[view_name][func_type] = contents.sub(/(\/\/|#)include-lib/,libs.join("\n"))
end
end
[views, language]
end
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def say words
puts words if @loud
end
def md5 string
Digest::MD5.hexdigest(string)
end
def read(file, libs=nil)
st = open(file).read
st.sub!(/(\/\/|#)include-lib/,libs) if libs
st
end
def create_or_update(id, fields)
existing = @db.get(id) rescue nil
if existing
updated = existing.merge(fields)
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if existing != updated
say "replacing #{id}"
db.save(updated)
else
say "skipping #{id}"
end
else
say "creating #{id}"
db.save(fields.merge({"_id" => id}))
end
end
end
end