Steps translation table

This page contains a table of demonstrative translations of step definitions into result invocations.

It is especially useful for newcomers who are not familiar with the Convenient Service DSL yet.

tip

Any combination of the in and out options described throughout this reference can be used together.

info

All the examples in this page are using service steps.

But it is also perfectly valid to use method steps in them.

The behavior of the in and out options stays the same for both cases.

info

All the examples in this page are using step directive.

But it is also perfectly valid to use and_step, not_step, and_not_step, or_step, and or_not_step in them.

The behavior of the in and out options stays the same for all the cases.

No in or out

Definition:

step AssertNodeAvailable

Translation:

def step_result
  @step_result ||= AssertNodeAvailable.result
end

One in usual method

Definitions (equivalent):

step ValidateUncastedParams,
  in: :params

step ValidateUncastedParams,
  in: [
    :params
  ]

Translation:

def step_result
  @step_result ||=
    ValidateUncastedParams.result(
      params: params
    )
end

Multiple in usual methods

Definition:

step LogRequestParams,
  in: [
    :request,
    :params
  ]

Translation:

def step_result
  @step_result ||=
    LogRequestParams.result(
      request: request,
      params: params
    )
end

One in alias method

Definitions (equivalent):

step ValidateCastedParams,
  in: {casted_params: :params}

step ValidateCastedParams,
  in: [
    {casted_params: :params}
  ]

Translation:

def step_result
  @step_result ||=
    ValidateCastedParams.result(
      casted_params: params
    )
end

Multiple in alias method

Definitions:

step AuditContent,
  in: [
    {content: :content_without_comments},
    {verbose: :debug}
  ]

Translation:

def step_result
  @step_result ||=
    AuditContent.result(
      content: content_without_comments,
      verbose: debug
    )
end

One out usual method

Definitions (equivalent):

step ReadFileContent,
  in: :path,
  out: :content

step ReadFileContent,
  in: :path,
  out: [
    :content
  ]

Translation:

def step_result
  @step_result ||=
    ReadFileContent.result(
      path: path
    )
end

def content
  step_result.data[:content]
end

Multiple out usual methods

Definition:

step CastParams,
  in: :params,
  out: [
    :original_params,
    :casted_params
  ]

Translation:

def step_result
  @step_result ||=
    CastParams.result(
      params: params
    )
end

def original_params
  step_result.data[:original_params]
end

def casted_params
  step_result.data[:casted_params]
end

One out alias method

Definitions (equivalent):

step FormatHeader,
  in: :parsed_content,
  out: {formatted_content: :formatted_header_content}

step FormatHeader,
  in: :parsed_content,
  out: [
    {formatted_content: :formatted_header_content}
  ]

Translation:

def step_result
  @step_result ||=
    FormatHeader.result(
      parsed_content: parsed_content
    )
end

def formatted_header_content
  step_result.data[:formatted_content]
end

Multiple out alias methods

Definition:

step ExtractParamsFromRequest,
  in: :request,
  out: [
    {header_params: :request_params_from_header},
    {body_params: :request_params_from_body}
  ]

Translation:

def step_result
  @step_result ||=
    ExtractParamsFromRequest.result(
      request: request
    )
end

def request_params_from_header
  step_result.data[:header_params]
end

def request_params_from_body
  step_result.data[:body_params]
end

One in raw value

Definitions (equivalent):

step AssertFeatureEnabled,
  in: {name: raw(:chat_v2)}

step AssertFeatureEnabled,
  in: [
    {name: raw(:chat_v2)}
  ]

Translation:

def step_result
  @step_result ||=
    AssertFeatureEnabled.result(
      name: :chat_v2
    )
end

Multiple in raw values

Definitions (equivalent):

step PrintShellCommand,
  in: [
    {text: raw("ls -a")}
    {stream: raw($stdout)}
  ]

Translation:

def step_result
  @step_result ||=
    PrintShellCommand.result(
      text: "ls -a",
      stream: $stdout
    )
end

info

in raw values are useful for passing values, constants, methods, etc from the class scope.

step PrintShellCommand,
  in: [
    {text: raw(display_directory_structure_command)}
    {stream: raw($stdout)}
  ]

def self.display_directory_structure_command
  "ls -a"
end

One in proc method

Definitions (equivalent):

step RemoveDirectoryRecursively,
  in: {path: ->{ "/tmp" }}

step RemoveDirectoryRecursively,
  in: [
    {path: ->{ "/tmp" }}
  ]

Translation:

def step_result
  @step_result ||=
    RemoveDirectoryRecursively.result(
      path: "/tmp"
    )
end

Multiple in proc methods

Definition:

step CreateSoftLink,
  in: [
    {source: ->{ "~/.bash_profile" }},
    {destination: ->{ "#{Dir.pwd}/bash_profile_link" }}
  ]

Translation:

def step_result
  @step_result ||=
    CreateSoftLink.result(
      source: "~/.bash_profile",
      destination: "#{Dir.pwd}/bash_profile_link"
    )
end

info

in proc methods are useful for passing values, constants, methods, etc from the instance scope.

step CreateSoftLink,
  in: [
    {source: ->{ "~/.bash_profile" }},
    {destination: ->{ generate_destination_path }}
  ]

def generate_destination_path
  "#{Dir.pwd}/bash_profile_link"
end

All-in-one example:

Definition:

ENV["API_ONLY"] = true

class UpdatePost
  include ConvenientService::Standard::Config

  PERMITTED_PARAMS = [:id, :format, :title, :description, :tags, :sources]

  attr_reader :http_string

  # ...

  step PrepareRequestObject
    in: [
      :http_string,
      {url_pattern: raw(url_pattern)},
      {role: ->{ admin? }},
      {permitted_keys: raw(PERMITTED_PARAMS)}
      {defaults: ->{ resolve_defaults_values }}
    ],
    out: [
      :params_from_path,
      :params_from_body,
      {headers: :request_headers}
    ]

  # ...

  def self.url_pattern
    /^\/rules\/(?<id>\d+)\.(?<format>\w+)$/
  end

  def admin?
    false
  end

  def resolve_defaults_values
    defaults_values = {format: "html", tags: [], sources: []}

    defaults_values[:format] = "json" if ENV["API_ONLY"]

    defaults_values
  end

  # ...
end

Translation:

ENV["API_ONLY"] = true

class UpdatePost
  include ConvenientService::Standard::Config

  PERMITTED_PARAMS = [:id, :format, :title, :description, :tags, :sources]

  attr_reader :http_string

  # ...

  def step_result
    @step_result ||= PrepareRequestObject.result(
      http_string: http_string,
      url_pattern: /^\/rules\/(?<id>\d+)\.(?<format>\w+)$/,
      role: admin?, # => false
      permitted_keys: [:id, :format, :title, :description, :tags, :sources],
      defaults: resolve_defaults_values # => {format: "json", tags: [], sources: []}
    )
  end

  def params_from_path
    step_result.data[:params_from_path]
  end

  def params_from_body
    step_result.data[:params_from_body]
  end

  def request_headers
    step_result.data[:headers]
  end

  # ...

  def self.url_pattern
    /^\/rules\/(?<id>\d+)\.(?<format>\w+)$/
  end

  def admin?
    false
  end

  def resolve_defaults_values
    defaults_values = {format: "html", tags: [], sources: []}

    defaults_values[:format] = "json" if ENV["API_ONLY"]

    defaults_values
  end

  # ...
end

note

def step_result is used to express the concept.

In reality, such a method is not generated by the Convenient Service under the hood.

It utilizes a lower-level toolset that is out of the scope of this guide.