fix: issue snakemake#366 and snakemake#2649 (snakemake#2928)

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Allow for custom URLs (fix issues snakemake#366 and snakemake#2649).

### QC
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* [x] I confirm that:

For all wrappers added by this PR, 

* there is a test case which covers any introduced changes,
* `input:` and `output:` file paths in the resulting rule can be changed
arbitrarily,
* either the wrapper can only use a single core, or the example rule
contains a `threads: x` statement with `x` being a reasonable default,
* rule names in the test case are in
[snake_case](https://en.wikipedia.org/wiki/Snake_case) and somehow tell
what the rule is about or match the tools purpose or name (e.g.,
`map_reads` for a step that maps reads),
* all `environment.yaml` specifications follow [the respective best
practices](https://stackoverflow.com/a/64594513/2352071),
* the `environment.yaml` pinning has been updated by running
`snakedeploy pin-conda-envs environment.yaml` on a linux machine,
* wherever possible, command line arguments are inferred and set
automatically (e.g. based on file extensions in `input:` or `output:`),
* all fields of the example rules in the `Snakefile`s and their entries
are explained via comments (`input:`/`output:`/`params:` etc.),
* `stderr` and/or `stdout` are logged correctly (`log:`), depending on
the wrapped tool,
* temporary files are either written to a unique hidden folder in the
working directory, or (better) stored where the Python function
`tempfile.gettempdir()` points to (see
[here](https://docs.python.org/3/library/tempfile.html#tempfile.gettempdir);
this also means that using any Python `tempfile` default behavior
works),
* the `meta.yaml` contains a link to the documentation of the respective
tool or command,
* `Snakefile`s pass the linting (`snakemake --lint`),
* `Snakefile`s are formatted with
[snakefmt](https://github.com/snakemake/snakefmt),
* Python wrapper scripts are formatted with
[black](https://black.readthedocs.io).
* Conda environments use a minimal amount of channels, in recommended
ordering. E.g. for bioconda, use (conda-forge, bioconda, nodefaults, as
conda-forge should have highest priority and defaults channels are
usually not needed because most packages are in conda-forge nowadays).

Author: fgvieira

bio/reference/ensembl-annotation/meta.yaml

@@ -4,3 +4,5 @@ authors:
   - Johannes Köster
 output:
   - Ensemble GTF or GFF3 anotation file
+params:
+  - url: URL from where to download cache data (optional; by default is ``ftp://ftp.ensembl.org/pub``)

bio/reference/ensembl-annotation/test/Snakefile

@@ -25,6 +25,8 @@ rule get_annotation_gz:
         # branch="plants",  # optional: specify branch
     log:
         "logs/get_annotation.log",
+    params:
+        url="http://ftp.ensembl.org/pub",
     cache: "omit-software"  # save space and time with between workflow caching (see docs)
     wrapper:
         "master/bio/reference/ensembl-annotation"

bio/reference/ensembl-annotation/wrapper.py

@@ -48,17 +48,8 @@
     )
 
 
-url = "ftp://ftp.ensembl.org/pub/{branch}release-{release}/{out_fmt}/{species}/{species_cap}.{build}.{gtf_release}.{flavor}{suffix}".format(
-    release=release,
-    gtf_release=gtf_release,
-    build=build,
-    species=species,
-    out_fmt=out_fmt,
-    species_cap=species.capitalize(),
-    suffix=suffix,
-    flavor=flavor,
-    branch=branch,
-)
+url = snakemake.params.get("url", "ftp://ftp.ensembl.org/pub")
+url = f"{url}/{branch}release-{release}/{out_fmt}/{species}/{species.capitalize()}.{build}.{gtf_release}.{flavor}{suffix}"
 
 
 try:

bio/reference/ensembl-sequence/meta.yaml

@@ -2,3 +2,7 @@ name: ensembl-sequence
 description: Download sequences (e.g. genome) from ENSEMBL FTP servers, and store them in a single .fasta file.
 authors:
   - Johannes Köster
+output:
+  - fasta file
+params:
+  - url: URL from where to download cache data (optional; by default is ``ftp://ftp.ensembl.org/pub``)

bio/reference/ensembl-sequence/test/Snakefile

@@ -25,6 +25,8 @@ rule get_single_chromosome:
         # branch="plants",  # optional: specify branch
     log:
         "logs/get_genome.log",
+    params:
+        url="http://ftp.ensembl.org/pub",
     cache: "omit-software"  # save space and time with between workflow caching (see docs)
     wrapper:
         "master/bio/reference/ensembl-sequence"

bio/reference/ensembl-sequence/wrapper.py

@@ -50,8 +50,9 @@
             "invalid datatype, to select a single chromosome the datatype must be dna"
         )
 
+url = snakemake.params.get("url", "ftp://ftp.ensembl.org/pub")
 spec = spec.format(build=build, release=release)
-url_prefix = f"ftp://ftp.ensembl.org/pub/{branch}release-{release}/fasta/{species}/{datatype}/{species.capitalize()}.{spec}"
+url_prefix = f"{url}/{branch}release-{release}/fasta/{species}/{datatype}/{species.capitalize()}.{spec}"
 
 success = False
 for suffix in suffixes:

bio/reference/ensembl-variation/meta.yaml

@@ -2,3 +2,7 @@ name: ensembl-variation
 description: Download known genomic variants from ENSEMBL FTP servers, and store them in a single .vcf.gz file.
 authors:
   - Johannes Köster
+output:
+  - VCF file
+params:
+  - url: URL from where to download cache data (optional; by default is ``ftp://ftp.ensembl.org/pub``)

bio/reference/ensembl-variation/test/Snakefile

@@ -12,6 +12,8 @@ rule get_variation:
         type="all",  # one of "all", "somatic", "structural_variation"
         # chromosome="21", # optionally constrain to chromosome, only supported for homo_sapiens
         # branch="plants",  # optional: specify branch
+    params:
+        url="http://ftp.ensembl.org/pub",
     log:
         "logs/get_variation.log",
     cache: "omit-software"  # save space and time with between workflow caching (see docs)

bio/reference/ensembl-variation/wrapper.py

@@ -62,16 +62,12 @@
 
 species_filename = species if release >= 91 else species.capitalize()
 
+url = snakemake.params.get("url", "ftp://ftp.ensembl.org/pub")
 urls = [
-    "ftp://ftp.ensembl.org/pub/{branch}release-{release}/variation/vcf/{species}/{species_filename}{suffix}.vcf.gz".format(
-        release=release,
-        species=species,
-        suffix=suffix,
-        species_filename=species_filename,
-        branch=branch,
-    )
+    f"{url}/{branch}release-{release}/variation/vcf/{species}/{species_filename}{suffix}.vcf.gz"
     for suffix in suffixes
 ]
+
 names = [os.path.basename(url) for url in urls]
 
 try:

bio/vep/cache/meta.yaml

@@ -3,3 +3,10 @@ description: Download VEP cache for given species, build and release.
 url: http://www.ensembl.org/info/docs/tools/vep/index.html
 authors:
   - Johannes Köster
+output:
+  - directory to store the VEP cache
+params:
+  - url: URL from where to download cache data (optional; by default is ``ftp://ftp.ensembl.org/pub``)
+  - species: species to download cache data
+  - build: build to download cache data
+  - release: release to download cache data