Class: Bosh::Cli::BlobManager

Inherits:
Object
  • Object
show all
Defined in:
lib/cli/blob_manager.rb

Overview

In order to avoid storing large objects in git repo, release might save them in the blobstore instead. BlobManager encapsulates most of the blob operations.

Constant Summary collapse

DEFAULT_INDEX_NAME = 
"blobs.yml"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(release) ⇒ BlobManager

Returns a new instance of BlobManager.

Parameters:



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# File 'lib/cli/blob_manager.rb', line 13

def initialize(release)
  @release = release
  @index_file = File.join(@release.dir, "config", DEFAULT_INDEX_NAME)

  legacy_index_file = File.join(@release.dir, "blob_index.yml")

  if File.exists?(legacy_index_file)
    if File.exists?(@index_file)
      err("Found both new and legacy blob index, please fix it")
    end
    FileUtils.mv(legacy_index_file, @index_file)
  end

  if File.file?(@index_file)
    @index = load_yaml_file(@index_file)
  else
    @index = {}
  end

  @src_dir = File.join(@release.dir, "src")
  unless File.directory?(@src_dir)
    err("`src' directory is missing")
  end

  @storage_dir = File.join(@release.dir, ".blobs")
  unless File.directory?(@storage_dir)
    FileUtils.mkdir(@storage_dir)
  end

  @blobs_dir = File.join(@release.dir, "blobs")
  unless File.directory?(@blobs_dir)
    FileUtils.mkdir(@blobs_dir)
  end

  @blobstore = @release.blobstore
  if @blobstore.nil?
    err("Blobstore is not configured")
  end

  @new_blobs = []
  @updated_blobs = []
end

Instance Attribute Details

#new_blobs ⇒ Object (readonly)

Returns the value of attribute new_blobs.



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# File 'lib/cli/blob_manager.rb', line 10

def new_blobs
  @new_blobs
end

#updated_blobs ⇒ Object (readonly)

Returns the value of attribute updated_blobs.



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# File 'lib/cli/blob_manager.rb', line 10

def updated_blobs
  @updated_blobs
end

Instance Method Details

#add_blob(local_path, blob_path) ⇒ void

This method returns an undefined value.

Registers a file as BOSH blob

Parameters:

  • local_path (String) —

    Local file path

  • blob_path (String) —

    Blob path relative to blobs directory



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# File 'lib/cli/blob_manager.rb', line 104

def add_blob(local_path, blob_path)
  unless File.exists?(local_path)
    err("File `#{local_path}' not found")
  end

  if File.directory?(local_path)
    err("`#{local_path}' is a directory")
  end

  if blob_path[0..0] == "/"
    err("Blob path should be a relative path")
  end

  if blob_path[0..5] == "blobs/"
    err("Blob path should not start with `blobs/'")
  end

  blob_dst = File.join(@blobs_dir, blob_path)

  if File.directory?(blob_dst)
    err("`#{blob_dst}' is a directory, please pick a different path")
  end

  update = false
  if File.exists?(blob_dst)
    if file_checksum(blob_dst) == file_checksum(local_path)
      err("Already tracking the same version of `#{blob_path}'")
    end
    update = true
    FileUtils.rm(blob_dst)
  end

  FileUtils.mkdir_p(File.dirname(blob_dst))
  FileUtils.cp(local_path, blob_dst, :preserve => true)
  FileUtils.chmod(0644, blob_dst)
  if update
    say("Updated #{blob_path.make_yellow}")
  else
    say("Added #{blob_path.make_yellow}")
  end

  say("When you are done testing the new blob, please run\n" +
      "`#{"bosh upload blobs".make_green}' and commit changes.")
end

#blobs_to_upload ⇒ Array

Returns a list of blobs that need to be uploaded

Returns:

  • (Array) 


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# File 'lib/cli/blob_manager.rb', line 58

def blobs_to_upload
  @new_blobs + @updated_blobs
end

#dirty? ⇒ Boolean

Returns whether blobs directory is dirty

Returns:

  • (Boolean) —

    Boolean



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# File 'lib/cli/blob_manager.rb', line 64

def dirty?
  @new_blobs.size > 0 || @updated_blobs.size > 0
end

#download_blob(path) ⇒ Object

Downloads blob from a blobstore

Parameters:

  • path (String) —

    Downloaded blob file path



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# File 'lib/cli/blob_manager.rb', line 269

def download_blob(path)
  unless @index.has_key?(path)
    err("Unknown blob path `#{path}'")
  end

  blob = @index[path]
  size = blob["size"].to_i
  tmp_file = File.open(File.join(Dir.mktmpdir, "bosh-blob"), "w")

  download_label = "downloading"
  if size > 0
    download_label += " " + pretty_size(size)
  end

  progress_bar = Thread.new do
    loop do
      break unless size > 0
      if File.exists?(tmp_file.path)
        pct = 100 * File.size(tmp_file.path).to_f / size
        progress(path, "#{download_label} (#{pct.to_i}%)...")
      end
      sleep(0.2)
    end
  end

  progress(path, "#{download_label}...")
  @blobstore.get(blob["object_id"], tmp_file)
  tmp_file.close
  progress_bar.kill
  progress(path, "downloaded\n".make_green)

  if file_checksum(tmp_file.path) != blob["sha"]
    err("Checksum mismatch for downloaded blob `#{path}'")
  end

  tmp_file.path
end

#print_status ⇒ void

This method returns an undefined value.

Prints out blobs status



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# File 'lib/cli/blob_manager.rb', line 70

def print_status
  total_file_size = @index.inject(0) do |total, (_, entry)|
    total += entry["size"].to_i
    total
  end

  say("Total: #{@index.size}, #{pretty_size(total_file_size)}")
  process_blobs_directory

  unless dirty?
    say("No blobs to upload".make_green)
    return
  end

  nl
  say("You have some blobs that need to be uploaded:")
  @new_blobs.each do |blob|
    size = File.size(File.join(@blobs_dir, blob))
    say("%s\t%s\t%s" % ["new".make_green, blob, pretty_size(size)])
  end

  @updated_blobs.each do |blob|
    size = File.size(File.join(@blobs_dir, blob))
    say("%s\t%s\t%s" % ["new version".make_yellow, blob, pretty_size(size)])
  end

  nl
  say("When ready please run `#{"bosh upload blobs".make_green}'")
end

#process_blobs_directory ⇒ void

This method returns an undefined value.

Processes all files in blobs directory and only leaves non-symlinks. Marks blobs as dirty if there are any non-symlink files.



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# File 'lib/cli/blob_manager.rb', line 161

def process_blobs_directory
  @updated_blobs = []
  @new_blobs = []

  Dir[File.join(@blobs_dir, "**", "*")].each do |file|
    next if File.directory?(file) || File.symlink?(file)
    # We don't care about symlinks because they represent blobs
    # that are already tracked.
    # Regular files are more interesting: it's either a new version
    # of an existing blob or a completely new blob.
    path = strip_blobs_dir(file)

    if File.exists?(File.join(@src_dir, path))
      err("File `#{path}' is in both `blobs' and `src' directory.\n" +
          "Please fix release repo before proceeding")
    end

    if @index.has_key?(path)
      if file_checksum(file) == @index[path]["sha"]
        # Already have exactly the same file in the index,
        # no need to keep it around. Also handles the migration
        # scenario for people with old blobs checked out.
        local_path = File.join(@storage_dir, @index[path]["sha"])
        if File.exists?(local_path)
          FileUtils.rm_rf(file)
        else
          FileUtils.mv(file, local_path)
        end
        install_blob(local_path, path, @index[path]["sha"])
      else
        @updated_blobs << path
      end
    else
      @new_blobs << path
    end
  end
end

#process_index ⇒ void

This method returns an undefined value.

Processes blobs index, fetches any missing or mismatched blobs, establishes symlinks in blobs directory to any files present in index.



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# File 'lib/cli/blob_manager.rb', line 210

def process_index
  @index.each_pair do |path, entry|
    if File.exists?(File.join(@src_dir, path))
      err("File `#{path}' is in both blob index and src directory.\n" +
          "Please fix release repo before proceeding")
    end

    local_path = File.join(@storage_dir, entry["sha"])
    need_download = true

    if File.exists?(local_path)
      checksum = file_checksum(local_path)
      if checksum == entry["sha"]
        need_download = false
      else
        progress(path, "checksum mismatch, re-downloading...\n".make_red)
      end
    end

    if need_download
      local_path = download_blob(path)
    end

    install_blob(local_path, path, entry["sha"])
  end
end

#remove_symlinks ⇒ void

This method returns an undefined value.

Removes all symlinks from blobs directory



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# File 'lib/cli/blob_manager.rb', line 201

def remove_symlinks
  Dir[File.join(@blobs_dir, "**", "*")].each do |file|
    FileUtils.rm_rf(file) if File.symlink?(file)
  end
end

#sync ⇒ void

This method returns an undefined value.

Synchronizes the contents of blobs directory with blobs index.



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# File 'lib/cli/blob_manager.rb', line 151

def sync
  say("Syncing blobs...")
  remove_symlinks
  process_blobs_directory
  process_index
end

#upload_blob(path) ⇒ Object

Uploads blob to a blobstore, updates blobs index.

Parameters:

  • path (String) —

    Blob path relative to blobs dir



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# File 'lib/cli/blob_manager.rb', line 239

def upload_blob(path)
  blob_path = File.join(@blobs_dir, path)

  unless File.exists?(blob_path)
    err("Cannot upload blob, local file `#{blob_path}' doesn't exist")
  end

  if File.symlink?(blob_path)
    err("`#{blob_path}' is a symlink")
  end

  checksum = file_checksum(blob_path)

  progress(path, "uploading...")
  object_id = @blobstore.create(File.open(blob_path, "r"))
  progress(path, "uploaded\n".make_green)

  @index[path] = {
    "object_id" => object_id,
    "sha" => checksum,
    "size" => File.size(blob_path)
  }

  update_index
  install_blob(blob_path, path, checksum)
  object_id
end