Class: CouchShell::Shell

Inherits:
Object
  • Object
show all
Defined in:
lib/couch-shell/shell.rb

Overview

Starting a shell:

require "couch-shell/shell"

shell = CouchShell::Shell.new(STDIN, STDOUT, STDERR)
# returns at end of STDIN or on a quit command
shell.read_execute_loop

Defined Under Namespace

Classes: FileToUpload, Quit, ShellUserError, UndefinedVariable

Constant Summary collapse

PREDEFINED_VARS = 
[
  "uuid", "id", "rev", "idr",
  "content-type", "server"
].freeze
JSON_DOC_START_RX = 
/\A[ \t\n\r]*[\(\{]/

Instance Method Summary collapse

Constructor Details

#initialize(stdin, stdout, stderr) ⇒ Shell

Returns a new instance of Shell.



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# File 'lib/couch-shell/shell.rb', line 64

def initialize(stdin, stdout, stderr)
  @stdin = stdin
  @stdout = stdout
  @stderr = stderr
  @server_url = nil
  @pathstack = []
  @highline = HighLine.new(@stdin, @stdout)
  @responses = RingBuffer.new(10)
  @eval_context = EvalContext.new(self)
  @viewtext = nil
  @stdout.puts "couch-shell #{VERSION}"
  @username = nil
  @password = nil
end

Instance Method Details

#cd(path, get = false) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 102

def cd(path, get = false)
  old_pathstack = @pathstack.dup
  case path
  when nil
    @pathstack = []
  when ".."
    if @pathstack.empty?
      errmsg "Already at server root, can't go up."
    else
      @pathstack.pop
    end
  when %r{\A/\z}
    @pathstack = []
  when %r{\A/}
    @pathstack = []
    cd path[1..-1], false
  when %r{/}
    path.split("/").each { |elem| cd elem, false }
  else
    @pathstack << path
  end
  if get
    if request("GET", nil) != "200"
      @pathstack = old_pathstack
    end
  end
end

#command_cd(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 489

def command_cd(argstr)
  cd interpolate(argstr), false
end

#command_cg(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 493

def command_cg(argstr)
  cd interpolate(argstr), true
end

#command_cput(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 476

def command_cput(argstr)
  url = request_command_with_body("PUT", argstr)
  cd url if @responses.current(&:ok?)
end

#command_delete(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 485

def command_delete(argstr)
  request "DELETE", interpolate(argstr)
end

#command_echo(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 510

def command_echo(argstr)
  if argstr
    @stdout.puts interpolate(argstr)
  end
end

#command_editview(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 555

def command_editview(argstr)
  if @pathstack.size != 1
    raise ShellUserError, "current directory must be database"
  end
  design_name, view_name = argstr.split(/\s+/, 2)
  if design_name.nil? || view_name.nil?
    raise ShellUserError, "design and view name required"
  end
  request "GET", "_design/#{design_name}", nil, false
  return unless @responses.current(&:ok?)
  design = @responses.current.json
  view = nil
  if design.respond_to?(:views) &&
      design.views.respond_to?(view_name.to_sym)
    view = design.views.__send__(view_name.to_sym)
  end
  mapval = view && view.respond_to?(:map) && view.map
  reduceval = view && view.respond_to?(:reduce) && view.reduce
  t = Tempfile.new(["view", ".js"])
  t.puts("map")
  if mapval
    t.puts mapval
  else
    t.puts "function(doc) {\n  emit(doc._id, doc);\n}"
  end
  if reduceval || view.nil?
    t.puts
    t.puts("reduce")
    if reduceval
      t.puts reduceval
    else
      t.puts "function(keys, values, rereduce) {\n\n}"
    end
  end
  t.close
  continue?(
    "Press ENTER to edit #{view ? 'existing' : 'new'} view, " +
    "CTRL+C to cancel ")
  unless system(editor_bin!, t.path)
    raise ShellUserError, "editing command failed with exit status #{$?.exitstatus}"
  end
  text = t.open.read
  @viewtext = text
  t.close
  mapf = nil
  reducef = nil
  inmap = false
  inreduce = false
  i = 0
  text.each_line { |line|
    i += 1
    case line
    when /^map\s*(.*)$/
      unless $1.empty?
        msg "recover view text with `print viewtext'"
        raise ShellUserError, "invalid map line at line #{i}"
      end
      unless mapf.nil?
        msg "recover view text with `print viewtext'"
        raise ShellUserError, "duplicate map line at line #{i}"
      end
      inreduce = false
      inmap = true
      mapf = ""
    when /^reduce\s*(.*)$/
      unless $1.empty?
        msg "recover view text with `print viewtext'"
        raise ShellUserError, "invalid reduce line at line #{i}"
      end
      unless reducef.nil?
        msg "recover view text with `print viewtext'"
        raise ShellUserError, "duplicate reduce line at line #{i}"
      end
      inmap = false
      inreduce = true
      reducef = ""
    else
      if inmap
        mapf << line
      elsif inreduce
        reducef << line
      elsif line =~ /^\s*$/
        # ignore
      else
        msg "recover view text with `print viewtext'"
        raise ShellUserError, "unexpected content at line #{i}"
      end
    end
  }
  mapf.strip! if mapf
  reducef.strip! if reducef
  mapf = nil if mapf && mapf.empty?
  reducef = nil if reducef && reducef.empty?
  prompt_msg "View parsed, following actions would be taken:"
  if mapf && mapval.nil?
    prompt_msg " Add map function."
  elsif mapf.nil? && mapval
    prompt_msg " Remove map function."
  elsif mapf && mapval && mapf != mapval
    prompt_msg " Update map function."
  end
  if reducef && reduceval.nil?
    prompt_msg " Add reduce function."
  elsif reducef.nil? && reduceval
    prompt_msg " Remove reduce function."
  elsif reducef && reduceval && reducef != reduceval
    prompt_msg " Update reduce function."
  end
  continue? "Press ENTER to submit, CTRL+C to cancel "
  if !design.respond_to?(:views)
    design.set_attr!("views", {})
  end
  if view.nil?
    design.views.set_attr!(view_name, {})
    view = design.views.__send__(view_name.to_sym)
  end
  if mapf.nil?
    view.delete_attr!("map")
  else
    view.set_attr!("map", mapf)
  end
  if reducef.nil?
    view.delete_attr!("reduce")
  else
    view.set_attr!("reduce", reducef)
  end
  request "PUT", "_design/#{design_name}", design.to_s
  unless @responses.current(&:ok?)
    msg "recover view text with `print viewtext'"
  end
ensure
  if t
    t.close
    t.unlink
  end
end

#command_exit(argstr) ⇒ Object

Raises:



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# File 'lib/couch-shell/shell.rb', line 497

def command_exit(argstr)
  raise Quit
end

#command_expand(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 541

def command_expand(argstr)
  @stdout.puts expand(interpolate(argstr))
end

#command_format(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 524

def command_format(argstr)
  unless argstr
    errmsg "expression required"
    return
  end
  val = shell_eval(argstr)
  if val.respond_to?(:couch_shell_format_string)
    @stdout.puts val.couch_shell_format_string
  else
    @stdout.puts val
  end
end

#command_get(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 468

def command_get(argstr)
  request "GET", interpolate(argstr)
end

#command_member(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 703

def command_member(argstr)
  id, rev = nil, nil
  json = @responses.current(&:json)
  unless json && (id = json.attr_or_nil!("_id")) &&
      (rev = json.attr_or_nil!("_rev")) &&
      (@pathstack.size > 0) &&
      (@pathstack.last == id.to_s)
    raise ShellUserError,
      "`cg' the desired document first, e.g.: `cg /my_db/my_doc_id'"
  end
  # TODO: read json string as attribute name if argstr starts with double
  # quote
  attr_name, new_valstr = argstr.split(/\s+/, 2)
  unless attr_name && new_valstr
    raise ShellUserError,
      "attribute name and new value argument required"
  end
  if new_valstr == "remove"
    json.delete_attr!(attr_name)
  else
    new_val = JsonValue.parse(new_valstr)
    json.set_attr!(attr_name, new_val)
  end
  request "PUT", "?rev=#{rev}", json.to_s
end

#command_post(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 481

def command_post(argstr)
  request_command_with_body("POST", argstr)
end

#command_print(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 516

def command_print(argstr)
  unless argstr
    errmsg "expression required"
    return
  end
  @stdout.puts shell_eval(argstr)
end

#command_put(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 472

def command_put(argstr)
  request_command_with_body("PUT", argstr)
end

#command_quit(argstr) ⇒ Object

Raises:



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# File 'lib/couch-shell/shell.rb', line 501

def command_quit(argstr)
  raise Quit
end

#command_server(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 537

def command_server(argstr)
  self.server = argstr
end

#command_sh(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 545

def command_sh(argstr)
  unless argstr
    errmsg "argument required"
    return
  end
  unless system(argstr)
    errmsg "command exited with status #{$?.exitstatus}"
  end
end

#command_user(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 729

def command_user(argstr)
  prompt_msg("Password:", false)
  @password = @highline.ask(" ") { |q| q.echo = "*" }
  # we save the username only after the password was entered
  # to allow cancellation during password input
  @username = argstr
end

#command_uuids(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 505

def command_uuids(argstr)
  count = argstr ? argstr.to_i : 1
  request "GET", "/_uuids?count=#{count}"
end

#command_view(argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 692

def command_view(argstr)
  if @pathstack.size != 1
    raise ShellUserError, "current directory must be database"
  end
  design_name, view_name = argstr.split("/", 2)
  if design_name.nil? || view_name.nil?
    raise ShellUserError, "argument in the form DESIGN/VIEW required"
  end
  request "GET", "_design/#{design_name}/_view/#{view_name}"
end

#continue?(msg) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/couch-shell/shell.rb', line 270

def continue?(msg)
  prompt_msg(msg, false)
  unless @stdin.gets.chomp.empty?
    raise ShellUserError, "cancelled"
  end
end

#editor_bin! ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 463

def editor_bin!
  ENV["EDITOR"] or
    raise ShellUserError, "EDITOR environment variable not set"
end

#errmsg(str) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 139

def errmsg(str)
  @stderr.puts @highline.color(str, :red)
end

#execute(input) ⇒ Object

When the user enters something, it is passed to this method for execution. You may call if programmatically to simulate user input.

If input is nil, it is interpreted as “end of input”, raising a CouchShell::Shell::Quit exception. This exception is also raised by other commands (e.g. “exit” and “quit”). All other exceptions are caught and displayed on stderr.



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# File 'lib/couch-shell/shell.rb', line 296

def execute(input)
  begin
    execute!(input)
  rescue Quit => e
    raise e
  rescue Interrupt
    @stdout.puts
    errmsg "interrupted"
  rescue UndefinedVariable => e
    errmsg "Variable `" + e.varname + "' is not defined."
  rescue ShellUserError => e
    errmsg e.message
  rescue Exception => e
    errmsg e.message
    errmsg e.backtrace[0..5].join("\n")
  end
end

#execute!(input) ⇒ Object

Basic execute without error handling. Raises various exceptions.



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# File 'lib/couch-shell/shell.rb', line 315

def execute!(input)
  case input
  when nil
    raise Quit
  when ""
    # do nothing
  else
    command, argstr = input.split(/\s+/, 2)
    command_message = :"command_#{command.downcase}"
    if self.respond_to?(command_message)
      send command_message, argstr
    else
      errmsg "unknown command `#{command}'"
    end
  end
end

#expand(url) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 237

def expand(url)
  u = @server_url
  "#{u.scheme}://#{u.host}:#{u.port}#{full_path url}"
end

#full_path(path) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 242

def full_path(path)
  stack = []
  if path !~ %r{\A/}
    stack = @pathstack.dup
  end
  if @server_url.path && !@server_url.path.empty?
    stack.unshift @server_url.path
  end
  if path && !path.empty? && path != "/"
    stack.push path
  end
  fpath = stack.join("/")
  if fpath !~ %r{\A/}
    "/" + fpath
  else
    fpath
  end
end

#http_client_request(method, absolute_url, body) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 215

def http_client_request(method, absolute_url, body)
  file = nil
  headers = {}
  if body.kind_of?(FileToUpload)
    file_to_upload = body
    file = File.open(file_to_upload.filename, "rb")
    #body = [{'Content-Type' => file_to_upload.content_type!,
    #         :content => file}]
    body = {'upload' => file}
  elsif body && body =~ JSON_DOC_START_RX
    headers['Content-Type'] = "application/json"
  end
  hclient = HTTPClient.new
  if @username && @password
    hclient.set_auth lookup_var("server"), @username, @password
  end
  res = hclient.request(method, absolute_url, body, headers)
  Response.new(res)
ensure
  file.close if file
end

#interpolate(str) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 342

def interpolate(str)
  return nil if str.nil?
  String.new.force_encoding(str.encoding).tap { |res|
    escape = false
    dollar = false
    expr = nil
    str.each_char { |c|
      if escape
        res << c
        escape = false
        next
      elsif c == '\\'
        escape = true
      elsif c == '$'
        dollar = true
        next
      elsif c == '('
        if dollar
          expr = ""
        else
          res << c
        end
      elsif c == ')'
        if expr
          res << shell_eval(expr).to_s
          expr = nil
        else
          res << c
        end
      elsif dollar
        res << "$"
      elsif expr
        expr << c
      else
        res << c
      end
      dollar = false
    }
  }
end

#lookup_var(var) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 387

def lookup_var(var)
  case var
  when "uuid"
    command_uuids nil
    if @responses.current(&:ok?)
      json = @responses.current.json
      if json && (uuids = json.couch_shell_ruby_value!["uuids"]) &&
          uuids.kind_of?(Array) && uuids.size > 0
        uuids[0]
      else
        raise ShellUserError,
          "interpolation failed due to unkown json structure"
      end
    else
      raise ShellUserError, "interpolation failed"
    end
  when "id"
    @responses.current { |r| r.attr "id", "_id" } or
      raise ShellUserError, "variable `id' not set"
  when "rev"
    @responses.current { |r| r.attr "rev", "_rev" } or
      raise ShellUserError, "variable `rev' not set"
  when "idr"
    "#{lookup_var 'id'}?rev=#{lookup_var 'rev'}"
  when "content-type"
    @responses.current(&:content_type)
  when "server"
    if @server_url
      u = @server_url
      "#{u.scheme}://#{u.host}:#{u.port}#{u.path}"
    else
      raise ShellUserError, "variable `server' not set"
    end
  when /\Ar(\d)\z/
    i = $1.to_i
    if @responses.readable_index?(i)
      @responses[i]
    else
      raise ShellUserError, "no response index #{i}"
    end
  when /\Aj(\d)\z/
    i = $1.to_i
    if @responses.readable_index?(i)
      if @responses[i].json
        @responses[i].json
      else
        raise ShellUserError, "no json in response #{i}"
      end
    else
      raise ShellUserError, "no response index #{i}"
    end
  when "viewtext"
    @viewtext or
      raise ShellUserError, "viewtext not set"
  else
    raise UndefinedVariable.new(var)
  end
end

#msg(str, newline = true) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 130

def msg(str, newline = true)
  @stdout.print @highline.color(str, :blue)
  if newline
    @stdout.puts
  else
    @stdout.flush
  end
end

#net_http_request(method, fpath, body) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 186

def net_http_request(method, fpath, body)
  res = nil
  Net::HTTP.start(@server_url.host, @server_url.port) do |http|
    req = (case method
           when "GET"
             Net::HTTP::Get
           when "PUT"
             Net::HTTP::Put
           when "POST"
             Net::HTTP::Post
           when "DELETE"
             Net::HTTP::Delete
           else
             raise "unsupported http method: `#{method}'"
           end).new(fpath)
    if @username && @password
      req.basic_auth @username, @password
    end
    if body
      req.body = body
      if req.content_type.nil? && req.body =~ JSON_DOC_START_RX
        req.content_type = "application/json"
      end
    end
    res = Response.new(http.request(req))
  end
  res
end

#normalize_server_url(url) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 79

def normalize_server_url(url)
  return nil if url.nil?
  # remove trailing slash
  url = url.sub(%r{/\z}, '')
  # prepend http:// if scheme is omitted
  if url =~ /\A\p{Alpha}(?:\p{Alpha}|\p{Digit}|\+|\-|\.)*:/
    url
  else
    "http://#{url}"
  end
end

#print_response(res, label = "", show_body = true) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 144

def print_response(res, label = "", show_body = true)
  @stdout.print @highline.color("#{res.code} #{res.message}", :cyan)
  msg " #{label}"
  if show_body
    if res.json
      @stdout.puts res.json.format
    elsif res.body
      @stdout.puts res.body
    end
  elsif res.body
    msg "body has #{res.body.bytesize} bytes"
  end
end

#prompt_msg(msg, newline = true) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 261

def prompt_msg(msg, newline = true)
  @stdout.print @highline.color(msg, :yellow)
  if newline
    @stdout.puts
  else
    @stdout.flush
  end
end

#read ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 277

def read
  lead = @pathstack.empty? ? ">>" : @pathstack.join("/") + " >>"
  begin
    @highline.ask(@highline.color(lead, :yellow) + " ") { |q|
      q.readline = true
    }
  rescue NoMethodError
    # this is BAD, but highline 1.6.1 reacts to CTRL+D with a NoMethodError
    return nil
  end
end

#read_execute_loop ⇒ Object

Start regular shell operation, i.e. reading commands from stdin and executing them. Returns when the user issues a quit command.



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# File 'lib/couch-shell/shell.rb', line 334

def read_execute_loop
  loop {
    execute(read)
  }
rescue Quit
  msg "bye"
end

#request(method, path, body = nil, show_body = true) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 158

def request(method, path, body = nil, show_body = true)
  unless @server_url
    errmsg "Server not set - can't perform request."
    return
  end
  fpath = URI.encode(full_path(path))
  msg "#{method} #{fpath} ", false
  if @server_url.scheme != "http"
    errmsg "Protocol #{@server_url.scheme} not supported, use http."
    return
  end
  # HTTPClient and CouchDB don't work together with simple put/post
  # requests to due some Keep-alive mismatch.
  #
  # Net:HTTP doesn't support file upload streaming.
  if body.kind_of?(FileToUpload) || method == "GET"
    res = http_client_request(method, URI.encode(expand(path)), body)
  else
    res = net_http_request(method, fpath, body)
  end
  @responses << res
  rescode = res.code
  vars = ["r#{@responses.index}"]
  vars << ["j#{@responses.index}"] if res.json
  print_response res, "  vars: #{vars.join(', ')}", show_body
  res.code
end

#request_command_with_body(method, argstr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 446

def request_command_with_body(method, argstr)
  if argstr =~ JSON_DOC_START_RX
    url, bodyarg = nil, argstr
  else
    url, bodyarg= argstr.split(/\s+/, 2)
  end
  if bodyarg && bodyarg.start_with?("@")
    filename, content_type = bodyarg[1..-1].split(/\s+/, 2)
    body = FileToUpload.new(filename, content_type)
  else
    body = bodyarg
  end
  real_url = interpolate(url)
  request method, real_url, body
  real_url
end

#server=(url) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 91

def server=(url)
  if url
    @server_url = URI.parse(normalize_server_url(url))
    msg "Set server to #{lookup_var 'server'}"
    request("GET", nil)
  else
    @server_url = nil
    msg "Set server to none."
  end
end

#shell_eval(expr) ⇒ Object 



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# File 'lib/couch-shell/shell.rb', line 383

def shell_eval(expr)
  @eval_context.instance_eval(expr)
end