Class: CloudFormationTool::CloudFormation::LambdaCode

Inherits:
Object
  • Object
show all
Includes:
Storable
Defined in:
lib/cloud_formation_tool/cloud_formation/lambda_code.rb

Constant Summary

Constants included from CloudFormationTool

VERSION

Instance Method Summary collapse

Methods included from Storable

#cached_object, #make_filename, #upload

Methods included from CloudFormationTool

#aws_config, #awsas, #awscf, #awscreds, #awsec2, #awss3, #cf_bucket_name, #find_profile, #profile, #region, #s3_bucket_name

Constructor Details

#initialize(code, tpl) ⇒ LambdaCode

Returns a new instance of LambdaCode.



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# File 'lib/cloud_formation_tool/cloud_formation/lambda_code.rb', line 10

def initialize(code, tpl)
  @data = code
  @data['Url'] = @data.delete 'URL' if @data.key? 'URL' # normalize to CF convention if seeing old key
  if @data.key? 'Url'
    log "Trying Lambda code from #{@data['Url']}"
    @data['Url'] = url = tpl.resolveVal(@data['Url'])
    return unless url.is_a? String
    log "Downloading Lambda code from #{url}"
    if already_in_cache(url)
      log "Reusing remote cached object instead of downloading"
    else
      res = fetch_from_url(url)
      @s3_url = URI(upload(make_filename(url.split('.').last), res.body, mime_type: res['content-type'], gzip: false))
      log "uploaded Lambda function to #{@s3_url}"
    end
  elsif @data.key? 'Path'
    @data['Path'] = path = tpl.resolveVal(@data['Path'])
    return unless path.is_a? String
    log "Reading Lambda code from #{path}"
    path = if path.start_with? "/" then path else "#{tpl.basedir}/#{path}" end
    if File.directory?(path)
      @s3_url = URI(upload(make_filename('zip'), zip_path(path), mime_type: 'application/zip', gzip: false))
      log "uploaded Lambda function to #{@s3_url}"
    else # Convert files to ZipFile
      @data.delete 'Path'
      @data['ZipFile'] = File.read(path)
    end
  end
end

Instance Method Details

#already_in_cache(uri_str) ⇒ Object 



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# File 'lib/cloud_formation_tool/cloud_formation/lambda_code.rb', line 51

def already_in_cache(uri_str)
  limit = 10
  url = URI(uri_str)
  until url.nil?
    begin
      raise ArgumentError, 'too many HTTP redirects' if limit == 0
      Net::HTTP.start(url.host, url.port, use_ssl: true) do |http|
        request = Net::HTTP::Get.new(url)
        http.request(request) do |response|
          # handle redirects like Github likes to do
          case response
            when Net::HTTPSuccess then
              url = nil
              http.finish if check_cached(response['ETag'])
            when Net::HTTPRedirection then
              location = response['location']
              log "Cache check redirected to #{location}"
              limit = limit - 1
              response.body
              url = URI(location)
            else
              log "arg err"
              raise ArgumentError, "Error getting response: #{response}"
          end
        end
      end
    rescue IOError => e
      retry unless url.nil?
    end
  end
  !@s3_url.nil?
end

#check_cached(etag) ⇒ Object 



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# File 'lib/cloud_formation_tool/cloud_formation/lambda_code.rb', line 84

def check_cached(etag)
  etag.gsub!(/"/,'') unless etag.nil?
  o = cached_object(etag)
  if o.nil?
    false
  else
    @s3_url = URI(o.public_url)
    true
  end
end

#fetch_from_url(uri_str) ⇒ Object 



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# File 'lib/cloud_formation_tool/cloud_formation/lambda_code.rb', line 95

def fetch_from_url(uri_str)
  $__fetch_cache ||= Hash.new do |h, url|
    h[url] = fetch_from_url_real(url)
  end
  $__fetch_cache[uri_str]
end

#fetch_from_url_real(uri_str, limit = 10) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/cloud_formation_tool/cloud_formation/lambda_code.rb', line 102

def fetch_from_url_real(uri_str, limit = 10)
  raise ArgumentError, 'too many HTTP redirects' if limit == 0
  response = Net::HTTP.get_response(URI(uri_str))
  case response
  when Net::HTTPSuccess then
    response
  when Net::HTTPRedirection then
    location = response['location']
    log "redirected to #{location}"
    fetch_from_url_real(location, limit - 1)
  else
    raise CloudFormationTool::Errors::AppError, "Error downloading #{url}: #{response.value}"
  end
end

#rdir(path, prefix = '', &block) ⇒ Object 



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# File 'lib/cloud_formation_tool/cloud_formation/lambda_code.rb', line 128

def rdir path, prefix = '', &block
  ents = []
  (Dir.entries(path) - %w(. ..)).collect do |ent|
    diskpath = File.join(path,ent)
    localpath = prefix.length>0 ? File.join(prefix,ent) : ent
    if block_given?
      if File.directory? diskpath
        rdir diskpath, localpath, &block
      else
        yield localpath
      end
    end
    if File.directory? diskpath
      rdir diskpath, localpath
    else
      ent
    end
  end.flatten
end

#to_cloudformation ⇒ Object 



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# File 'lib/cloud_formation_tool/cloud_formation/lambda_code.rb', line 117

def to_cloudformation
  if @s3_url.nil?
    @data
  else
    {
      'S3Bucket' => @s3_url.hostname.split('.').first,
      'S3Key' => @s3_url.path[1..-1]
    }
  end
end

#zip_path(path) ⇒ Object 



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# File 'lib/cloud_formation_tool/cloud_formation/lambda_code.rb', line 40

def zip_path(path)
  Zip::OutputStream.write_buffer do |zf|
    rdir path do |ent|
      #log "Deflating #{ent}"
      filepath = File.join(path,ent)
      zf.put_next_entry ::Zip::Entry.new(nil, ent, nil, nil, nil, nil, nil, nil, ::Zip::DOSTime.at(File.mtime(filepath).to_i))
      zf.write File.read(filepath) 
    end
  end.string
end