/
base_scraper.py
451 lines (398 loc) · 15.1 KB
/
base_scraper.py
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from abc import ABC, abstractmethod
from copy import deepcopy
from typing import Dict, List, Optional, Set, Tuple
from .utilities.reader import Read
from .utilities.sources import Sources
from hdx.utilities.dictandlist import dict_of_lists_add
from hdx.utilities.typehint import ListTuple
class BaseScraper(ABC):
"""Base scraper class for scrapers to inherit
Args:
name (str): Name of scraper
datasetinfo (Dict): Information about dataset
headers (Dict[str, Tuple]): Headers to be oytput at each level_name
source_configuration (Dict): Configuration for sources. Defaults to empty dict (use defaults).
reader (str): Reader to use. Defaults to "" (datasetinfo reader falling back on name).
"""
population_lookup = {}
def __init__(
self,
name: str,
datasetinfo: Dict,
headers: Dict[str, Tuple],
source_configuration: Dict = {},
reader: str = "",
) -> None:
self.name = name
if reader:
self.reader = reader
else:
self.reader = datasetinfo.get("reader", name)
self.setup(headers, source_configuration)
self.datasetinfo = deepcopy(datasetinfo)
self.errors_on_exit = None
self.can_fallback = True
def setup(
self,
headers: Dict[str, Tuple],
source_configuration: Dict = {},
) -> None:
"""Initialise member variables including name and headers which is of form:
{"national": (("School Closure",), ("#impact+type",)), ...},
Args:
headers (Dict[str, Tuple]): Headers to be output at each level_name
source_configuration (Dict): Configuration for sources. Defaults to empty dict (use defaults).
Returns:
None
"""
self.headers = headers
self.initialise_values_sources(source_configuration)
self.has_run = False
self.fallbacks_used = False
self.source_urls = set()
self.population_key = None
def initialise_values_sources(
self,
source_configuration: Dict = {},
) -> None:
"""
Create values and sources member variables for inheriting scrapers to populate.
values will be of form:
{"national": ({"AFG": 1.2, "PSE": 1.4}, {"AFG": 123, "PSE": 241}, ...})}
sources will be of form:
{"national": [("#food-prices", "2022-07-15", "WFP", "https://data.humdata.org/dataset/global-wfp-food-prices"), ...]
Args:
source_configuration (Dict): Configuration for sources. Defaults to empty dict (use defaults).
Returns:
None
"""
self.values: Dict[str, Tuple] = {
level: tuple({} for _ in value[0])
for level, value in self.headers.items()
}
self.sources: Dict[str, List] = {level: [] for level in self.headers}
self.source_configuration = deepcopy(source_configuration)
def get_reader(self, name: Optional[str] = None):
"""Get reader given name if provided or using name member variable if
not.
Args:
name (str): Name of scraper
Returns:
None
"""
if not name:
name = self.reader
reader = Read.get_reader(name)
return reader
def get_headers(self, level: str) -> Optional[Tuple[Tuple]]:
"""
Get headers for a particular level_name like national or subnational. Will be
of form: (("School Closure",), ("#impact+type",))
Args:
level (str): Level to get like national, subnational or single
Returns:
Optional[Tuple[Tuple]]: Scraper headers or None
"""
return self.headers.get(level)
def get_values(self, level: str) -> Optional[Tuple]:
"""
Get values for a particular level_name like national or subnational. Will be of
form: ({"AFG": 1.2, "PSE": 1.4}, {"AFG": 123, "PSE": 241}, ...})}
Args:
level (str): Level for which to get headers
Returns:
Optional[Tuple]: Scraper values or None
"""
return self.values.get(level)
def add_sources(self) -> None:
"""
Adds sources for a particular level_name
Returns:
None
"""
if self.source_configuration.get("no_sources", False):
return
if self.datasetinfo.get("no_sources", False):
return
should_overwrite_sources = self.datasetinfo.get(
"should_overwrite_sources"
)
if should_overwrite_sources is not None:
self.source_configuration[
"should_overwrite_sources"
] = should_overwrite_sources
source = self.datasetinfo["source"]
if isinstance(source, str):
source = {"default_source": source}
source_url = self.datasetinfo["source_url"]
if isinstance(source_url, str):
source_url = {"default_url": source_url}
Sources.standardise_datasetinfo_source_date(self.datasetinfo)
if not any(
key in self.source_configuration
for key in ("suffix_attribute", "admin_sources")
):
for level in self.headers:
self.sources[level] = [
(
hxltag,
Sources.get_hxltag_source_date(
self.datasetinfo, hxltag, fallback=True
),
source.get(hxltag, source["default_source"]),
source_url.get(hxltag, source_url["default_url"]),
)
for hxltag in self.headers[level][1]
]
return
for level in self.headers:
self.sources[level] = []
def add_source(hxltag, suffix_attribute):
hxltag_suffix = f"{hxltag}+{suffix_attribute.lower()}"
source_suffix = f"CUSTOM_{suffix_attribute}"
out_date = Sources.get_hxltag_source_date(
self.datasetinfo, hxltag_suffix
)
if not out_date:
out_date = Sources.get_hxltag_source_date(
self.datasetinfo, source_suffix
)
if not out_date:
out_date = Sources.get_hxltag_source_date(
self.datasetinfo, hxltag, fallback=True
)
out_source = source.get(hxltag_suffix)
if not out_source:
out_source = source.get(source_suffix)
if not out_source:
out_source = source.get(hxltag)
if not out_source:
out_source = source["default_source"]
out_url = source_url.get(hxltag_suffix)
if not out_url:
out_url = source_url.get(source_suffix)
if not out_url:
out_url = source_url.get(hxltag)
if not out_url:
out_url = source_url["default_url"]
self.sources[level].append(
(
hxltag_suffix,
out_date,
out_source,
out_url,
)
)
for i, hxltag in enumerate(self.headers[level][1]):
suffix_attribute = self.source_configuration.get(
"suffix_attribute"
)
if suffix_attribute:
add_source(hxltag, suffix_attribute)
continue
values = self.get_values(level)[i]
admin_sources = self.source_configuration.get(
"admin_sources", False
)
if not admin_sources:
raise ValueError("Invalid source configuration!")
admin_mapping = self.source_configuration.get("admin_mapping")
if len(values) == 1 and next(iter(values)) == "value":
if admin_mapping:
out_adm = admin_mapping.get(level)
else:
out_adm = level
if out_adm:
add_source(hxltag, out_adm)
continue
out_adms = []
for adm in values.keys():
if admin_mapping:
out_adm = admin_mapping.get(adm)
if out_adm and out_adm not in out_adms:
out_adms.append(out_adm)
else:
out_adms.append(adm)
for out_adm in out_adms:
add_source(hxltag, out_adm)
def add_hxltag_source(
self,
hxltag: str,
datasetinfo: Optional[Dict] = None,
key: Optional[str] = None,
) -> None:
"""
Adds source identified by HXL hashtag under a particular key.
Args:
hxltag (str): HXL hashtag to use for source
datasetinfo (Optional[Dict]): Information about dataset. Defaults to None (use self.datasetinfo).
key (Optional[str]): Key under which to add source. Defaults to None (use scraper name).
Returns:
None
"""
if datasetinfo is None:
datasetinfo = self.datasetinfo
date = Sources.get_hxltag_source_date(
datasetinfo, hxltag, fallback=True
)
if key is None:
key = self.name
dict_of_lists_add(
self.sources,
key,
(
hxltag,
date,
datasetinfo["source"],
datasetinfo["source_url"],
),
)
def add_hxltag_sources(
self,
hxltags: ListTuple[str],
datasetinfo: Optional[Dict] = None,
key: Optional[str] = None,
suffix_attributes: Optional[ListTuple] = None,
) -> None:
"""
Adds sources identified by HXL hashtags under a particular key.
Args:
hxltags (ListTuple[str]): HXL hashtags to use for sources
datasetinfo (Optional[Dict]): Information about dataset. Defaults to None (use self.datasetinfo).
key (Optional[str]): Key under which to add source. Defaults to None (use scraper name).
suffix_attributes (Optional[ListTuple]): List of suffix attributes to append to HXL hashtags eg. iso3 codes
Returns:
None
"""
for hxltag in hxltags:
if suffix_attributes is None:
self.add_hxltag_source(hxltag, datasetinfo, key)
else:
for suffix_attribute in suffix_attributes:
self.add_hxltag_source(
f"{hxltag}+{suffix_attribute.lower()}",
datasetinfo,
key,
)
def get_sources(self, level: str) -> Optional[List[Tuple]]:
"""
Get values for a particular level_name like national or subnational. Will be of
form:
[("#food-prices", "2022-07-15", "WFP", "https://data.humdata.org/dataset/global-wfp-food-prices"), ...]
Args:
level (str): Level to get like national, subnational or single
Returns:
Optional[List[Tuple]]: Scraper sources or None
"""
return self.sources.get(level)
def add_source_urls(self) -> None:
"""
Add source urls from the datasetinfo member variable
Returns:
None
"""
source_url = self.datasetinfo.get("source_url")
if source_url:
if isinstance(source_url, str):
self.source_urls.add(source_url)
else:
for url in source_url.values():
self.source_urls.add(url)
def get_source_urls(self) -> Set[str]:
"""
Get source urls
Returns:
Set[str]: Source urls
"""
return self.source_urls
def get_hapi_dataset_metadata(self) -> Optional[Dict]:
"""
Get HAPI dataset metadata
Returns:
Optional[Dict]: HAPI dataset metadata
"""
return self.datasetinfo.get("hapi_dataset_metadata")
def get_hapi_resource_metadata(self) -> Optional[Dict]:
"""
Get HAPI resource metadata
Returns:
Optional[Dict]: HAPI resource metadata
"""
hapi_resource_metadata = self.datasetinfo.get("hapi_resource_metadata")
if not hapi_resource_metadata:
return None
if "is_hxl" in hapi_resource_metadata:
return hapi_resource_metadata
reader = self.get_reader()
filename = self.datasetinfo.get("filename")
file_prefix = self.datasetinfo.get("file_prefix", self.name)
if filename:
kwargs = {"filename": filename}
else:
kwargs = {"file_prefix": file_prefix}
hxl_info = reader.hxl_info_hapi_resource_metadata(
hapi_resource_metadata,
**kwargs,
)
is_hxl = False
if hxl_info:
for sheet in hxl_info.get("sheets", ()):
if sheet["is_hxlated"]:
is_hxl = True
break
hapi_resource_metadata["is_hxl"] = is_hxl
return self.datasetinfo.get("hapi_resource_metadata")
def add_population(self) -> None:
"""
Add population data by looking for the #population HXL hashtag among the
headers and pulling out the associated values
Returns:
None
"""
for level in self.headers:
try:
population_index = self.headers[level][1].index("#population")
except ValueError:
population_index = None
if population_index is not None:
values = self.values[level][population_index]
if len(values) == 1 and "value" in values:
values = (
(
self.datasetinfo.get("population_key") or level,
values["value"],
),
)
else:
values = values.items()
for key, value in values:
try:
valint = int(value)
self.population_lookup[key] = valint
except (TypeError, ValueError):
pass
@abstractmethod
def run(self) -> None:
"""
Run scraper. Must be overridden.
Returns:
None
"""
def run_after_fallbacks(self) -> None:
"""
Executed after fallbacks are used. Can be overridden if needed.
Returns:
None
"""
def pre_run(self) -> None:
"""
Executed before running. Can be overridden if needed.
Returns:
None
"""
def post_run(self) -> None:
"""
Executed after running. Can be overridden if needed.
Returns:
None
"""