nf_core.utils

Common utility functions for the nf-core python package.

classnf_core.utils.GitHub_API_Session

Bases: CachedSession

Class to provide a single session for interacting with the GitHub API for a run. Inherits the requests_cache.CachedSession and adds additional functionality, such as automatically setting up GitHub authentication if we can.

get(url, **kwargs)

Initialise the session if we haven’t already, then call the superclass get method.

lazy_init()

Initialise the object.

Only do this when it’s actually being used (due to global import)

log_content_headers(request, post_data=None)

Try to dump everything to the console, useful when things go wrong.

request_retry(url, post_data=None)

Try to fetch a URL, keep retrying if we get a certain return code.

Used in nf-core sync code because we get 403 errors: too many simultaneous requests See https://github.com/nf-core/tools/issues/911

safe_get(url)

Run a GET request, raise a nice exception with lots of logging if it fails.

setup_github_auth(auth=None)

Try to automatically set up GitHub authentication

classnf_core.utils.Pipeline(wf_path)

Bases: object

Object to hold information about a local pipeline.

• Parameters: path (str) – The path to the nf-core pipeline directory.

conda_config

The parsed conda configuration file content (environment.yml).

• Type: dict

conda_package_info

The conda package(s) information, based on the API requests to Anaconda cloud.

• Type: dict

nf_config

The Nextflow pipeline configuration file content.

• Type: dict

files

A list of files found during the linting process.

• Type: list

git_sha

The git sha for the repo commit / current GitHub pull-request ($GITHUB_PR_COMMIT)

• Type: str

minNextflowVersion

The minimum required Nextflow version to run the pipeline.

• Type: str

wf_path

Path to the pipeline directory.

• Type: str

pipeline_name

The pipeline name, without the nf-core tag, for example hlatyping.

• Type: str

schema_obj

A PipelineSchema object

• Type: obj

_fp(fn)

Convenience function to get full path to a file in the pipeline

_list_files()

Get a list of all files in the pipeline

_load()

Run core load functions

_load_conda_environment()

Try to load the pipeline environment.yml file, if it exists

_load_pipeline_config()

Get the nextflow config for this pipeline

Once loaded, set a few convienence reference class attributes

nf_core.utils.anaconda_package(dep, dep_channels=None)

Query conda package information.

Sends a HTTP GET request to the Anaconda remote API.

• Parameters:
  • dep (str) – A conda package name.
  • dep_channels (list) – list of conda channels to use
• Raises:
  • A LookupError**,** if the connection fails or times out or gives an unexpected status code –
  • A ValueError**,** if the package name can not be found (**404**) –

nf_core.utils.check_if_outdated(current_version=None, remote_version=None, source_url='https://nf-co.re/tools_version')

Check if the current version of nf-core is outdated

nf_core.utils.custom_yaml_dumper()

Overwrite default PyYAML output to make Prettier YAML linting happy

nf_core.utils.determine_base_dir(directory='.')

nf_core.utils.fetch_wf_config(wf_path, cache_config=True)

Uses Nextflow to retrieve the the configuration variables from a Nextflow workflow.

• Parameters:
  • wf_path (str) – Nextflow workflow file system path.
  • cache_config (bool) – cache configuration or not (def. True)
• Returns: Workflow configuration settings.
• Return type: dict

nf_core.utils.file_md5(fname)

Calculates the md5sum for a file on the disk.

• Parameters: fname (str) – Path to a local file.

nf_core.utils.get_biocontainer_tag(package, version)

Given a bioconda package and version, looks for Docker and Singularity containers using the biocontaineres API, e.g.: https://api.biocontainers.pro/ga4gh/trs/v2/tools/{tool}/versions/{tool}-{version} Returns the most recent container versions by default.

• Raises:
  • A LookupError**,** if the connection fails or times out or gives an unexpected status code –
  • A ValueError**,** if the package name can not be found (**404**) –

nf_core.utils.get_first_available_path(directory, paths)

nf_core.utils.get_repo_releases_branches(pipeline, wfs)

Fetches details of a nf-core workflow to download.

• Parameters:
  • pipeline (str) – GitHub repo username/repo
  • wfs – A nf_core.list.Workflows() object, where get_remote_workflows() has been called.
• Returns: Array of releases, Array of branches
• Return type: wf_releases, wf_branches (tuple)
• Raises: LockupError**,** if the pipeline can not be found. –

nf_core.utils.is_file_binary(path)

Check file path to see if it is a binary file

nf_core.utils.is_pipeline_directory(wf_path)

Checks if the specified directory have the minimum required files (‘main.nf’, ‘nextflow.config’) for a pipeline directory

• Parameters: wf_path (str) – The directory to be inspected
• Raises: UserWarning – If one of the files are missing

nf_core.utils.is_relative_to(path1, path2)

Checks if a path is relative to another.

Should mimic Path.is_relative_to which not available in Python < 3.9

path1 (Path | str): The path that could be a subpath path2 (Path | str): The path the could be the superpath

nf_core.utils.load_tools_config(directory='.')

Parse the nf-core.yml configuration file

Look for a file called either .nf-core.yml or .nf-core.yaml

Also looks for the deprecated file .nf-core-lint.yml/yaml and issues a warning that this file will be deprecated in the future

Returns the loaded config dict or False, if the file couldn’t be loaded

nf_core.utils.nextflow_cmd(cmd)

Run a Nextflow command and capture the output. Handle errors nicely

nf_core.utils.parse_anaconda_licence(anaconda_response, version=None)

Given a response from the anaconda API using anaconda_package, parse the software licences.

Returns: Set of licence types

nf_core.utils.pip_package(dep)

Query PyPI package information.

Sends a HTTP GET request to the PyPI remote API.

• Parameters: dep (str) – A PyPI package name.
• Raises:
  • A LookupError**,** if the connection fails or times out –
  • A ValueError**,** if the package name can not be found –

nf_core.utils.plural_es(list_or_int)

Return a ‘es’ if the input is not one or has not the length of one.

nf_core.utils.plural_s(list_or_int)

Return an s if the input is not one or has not the length of one.

nf_core.utils.plural_y(list_or_int)

Return ‘ies’ if the input is not one or has not the length of one, else ‘y’.

nf_core.utils.poll_nfcore_web_api(api_url, post_data=None)

Poll the nf-core website API

Takes argument api_url for URL

Expects API reponse to be valid JSON and contain a top-level ‘status’ key.

nf_core.utils.prompt_pipeline_release_branch(wf_releases, wf_branches)

Prompt for pipeline release / branch

• Parameters:
  • wf_releases (array) – Array of repo releases as returned by the GitHub API
  • wf_branches (array) – Array of repo branches, as returned by the GitHub API
• Returns: Selected release / branch name
• Return type: choice (str)

nf_core.utils.prompt_remote_pipeline_name(wfs)

Prompt for the pipeline name with questionary

• Parameters: wfs – A nf_core.list.Workflows() object, where get_remote_workflows() has been called.
• Returns: GitHub repo - username/repo
• Return type: pipeline (str)
• Raises: AssertionError**,** if pipeline cannot be found –

nf_core.utils.rich_force_colors()

Check if any environment variables are set to force Rich to use coloured output

nf_core.utils.setup_nfcore_dir()

Creates a directory for files that need to be kept between sessions

Currently only used for keeping local copies of modules repos

nf_core.utils.setup_requests_cachedir()

Sets up local caching for faster remote HTTP requests.

Caching directory will be set up in the user’s home directory under a .config/nf-core/cache_* subdir.

Uses requests_cache monkey patching. Also returns the config dict so that we can use the same setup with a Session.

nf_core.utils.sort_dictionary(d)

Sorts a nested dictionary recursively

nf_core.utils.strip_ansi_codes(string, replace_with='')

Strip ANSI colouring codes from a string to return plain text.

From Stack Overflow: https://stackoverflow.com/a/14693789/713980

nf_core.utils.validate_file_md5(file_name, expected_md5hex)

Validates the md5 checksum of a file on disk.

• Parameters:
  • file_name (str) – Path to a local file.
  • expected (str) – The expected md5sum.
• Raises: IOError**,** if the md5sum does not match the remote sum. –

nf_core.utils.wait_cli_function(poll_func, refresh_per_second=20)

Display a command-line spinner while calling a function repeatedly.

Keep waiting until that function returns True

• Parameters:
  • poll_func (function) – Function to call
  • refresh_per_second (int) – Refresh this many times per second. Default: 20.
• Returns: None. Just sits in an infite loop until the function returns True.