def convert_tables_to_json(csv_folder: Path, output_folder: Path, **tqdm_kwargs) -> Iterable[Path]:
# Convert all CSV files to JSON using values format
map_iter = list(csv_folder.glob("**/*.csv"))
map_opts = dict(total=len(map_iter), desc="Converting to JSON", **tqdm_kwargs)
map_func = partial(_try_json_covert, get_schema(), csv_folder, output_folder)
return list(pbar(map(map_func, map_iter), **map_opts))
def publish_location_breakouts(
tables_folder: Path,
output_folder: Path,
use_table_names: List[str] = None) -> List[Path]:
"""
Breaks out each of the tables in `tables_folder` based on location key, and writes them into
subdirectories of `output_folder`.
Arguments:
tables_folder: Directory containing input CSV files.
output_folder: Output path for the resulting location data.
"""
# Default to a known list of tables to use when none is given
map_iter = _get_tables_in_folder(tables_folder, use_table_names
or V2_TABLE_LIST)
# Break out each table into separate folders based on the location key
_logger.log_info(f"Breaking out tables {[x.stem for x in map_iter]}")
map_func = partial(table_breakout,
output_folder=output_folder,
breakout_column="location_key")
return list(
pbar(map(map_func, map_iter),
desc="Breaking out tables",
total=len(map_iter)))
def _test_join_all(self, how_mem: str, how_pandas: str):
# Create a custom function used to read tables casting to the expected schema
read_table_ = partial(read_table, schema=SCHEMA, low_memory=False)
# Test joining the index table with every other table
left = SRC / "test" / "data" / "index.csv"
for right in pbar([*(SRC / "test" / "data").glob("*.csv")],
leave=False):
if left.name == right.name:
continue
left_columns = get_table_columns(left)
right_columns = get_table_columns(right)
if not "date" in right_columns:
self._test_join_pair(read_table_, SCHEMA, left, right, ["key"],
how_mem, how_pandas)
if "date" in left_columns and not "date" in right_columns:
self._test_join_pair(read_table_, SCHEMA, left, right, ["key"],
how_mem, how_pandas)
if "date" in left_columns and "date" in right_columns:
self._test_join_pair(read_table_, SCHEMA, left, right,
["key", "date"], how_mem, how_pandas)
def publish_location_aggregates(
breakout_folder: Path,
output_folder: Path,
location_keys: Iterable[str],
use_table_names: List[str] = None,
**tqdm_kwargs,
) -> List[Path]:
"""
This method joins *all* the tables for each location into a main.csv table.
Arguments:
tables_folder: Directory containing input CSV files.
output_folder: Output path for the resulting location data.
location_keys: List of location keys to do aggregation for.
"""
# Create a main.csv file for each of the locations in parallel
map_iter = list(location_keys)
_logger.log_info(f"Aggregating outputs for {len(map_iter)} location keys")
map_opts = dict(total=len(map_iter),
desc="Creating location subsets",
**tqdm_kwargs)
map_func = partial(
_aggregate_location_breakouts,
breakout_folder,
output_folder,
use_table_names=use_table_names,
)
return list(pbar(map(map_func, map_iter), **map_opts))
def _process_state(data: DataFrame) -> DataFrame:
data["date"] = data["date"].apply(lambda x: str(x)[:10])
data["subregion2_code"] = data["fips_code"].apply(
lambda x: numeric_code_as_string(x, 5))
data["key"] = "US_" + data["state"] + "_" + data["subregion2_code"]
data.drop(
columns=[
"subregion2_code",
"state",
"fips_code",
"county",
"report_date_window_end",
"report_date_window_start",
],
inplace=True,
)
# Make sure the data is properly sorted, since we need to compute diffs
data.sort_values(["key", "date"], inplace=True)
# Get a mapping between rolling average column names and their daily counterparts
col_prefixes = (
"new_cases",
"new_deaths",
"new_test_results_reported",
"admissions_covid_confirmed",
)
rolling_suffix = "_7_day_rolling_average"
rolling_columns_map = {
col + rolling_suffix: col.replace(rolling_suffix, "")
for col in col_prefixes
}
# Seed the daily versions of the columns with empty values
for name in rolling_columns_map.values():
data[name] = None
# Convert the rolling average columns to daily values one key at a time
# This can probably be done with some clever grouping function instead, but iteratively is
# fast enough and it works reliably.
for key in pbar(data["key"].unique(),
desc="Computing daily values from rolling means"):
mask = data["key"] == key
for col, name in rolling_columns_map.items():
subset = data.loc[mask, col].dropna()
data.loc[subset.index, name] = recover_from_rolling_mean(subset, 7)
# Get rid of unnecessary columns now that we have the daily values
data.drop(columns=rolling_columns_map.keys(), inplace=True)
return table_rename(
data,
{
"new_cases": "new_confirmed",
"new_deaths": "new_deceased",
"new_test_results_reported": "new_tested",
"admissions_covid_confirmed": "new_hospitalized",
},
)
def parse(self, sources: Dict[str, str], aux: Dict[str, DataFrame],
**parse_opts) -> DataFrame:
# Get all the weather stations with data up until last month from inventory
year = int(parse_opts.get("year")) if "year" in parse_opts else None
cur_date = datetime.date(year, 12,
31) if year else datetime.date.today()
min_date = (cur_date - datetime.timedelta(days=30)).strftime("%Y%m%d")
stations = read_file(
sources["inventory"]).rename(columns={
"LAT": "lat",
"LON": "lon",
"ELEV(M)": "elevation"
})
stations = stations[stations.END > int(min_date)]
stations["id"] = stations["USAF"] + stations["WBAN"].apply(
lambda x: f"{x:05d}")
# Open the station data as a compressed file
station_cache = dict()
with tarfile.open(sources["gsod"], mode="r:gz") as stations_tar:
# Build the station cache by decompressing all files in memory
map_iter = stations_tar.getmembers()
map_func = partial(_extract_station, stations_tar)
map_opts = dict(desc="Decompressing", total=len(map_iter))
for station_item in pbar(map(map_func, map_iter), **map_opts):
station_cache.update(station_item)
# Get all the POI from metadata and go through each key
keep_columns = ["key", "latitude", "longitude"]
metadata = read_file(sources["geography"])[keep_columns].dropna()
# Only use keys present in the metadata table
metadata = metadata.merge(aux["metadata"])[keep_columns]
# Convert all coordinates to radians
stations["lat"] = stations["lat"].apply(math.radians)
stations["lon"] = stations["lon"].apply(math.radians)
metadata["lat"] = metadata["latitude"].apply(math.radians)
metadata["lon"] = metadata["longitude"].apply(math.radians)
# Use a manager to handle memory accessed across processes
manager = Manager()
station_cache = manager.dict(station_cache)
# Make sure the stations and the cache are sent to each function call
map_func = partial(_process_location, station_cache, stations)
# We don't care about the index while iterating over each metadata item
map_iter = (record for _, record in metadata.iterrows())
# Bottleneck is network so we can use lots of threads in parallel
records = process_map(map_func, map_iter, total=len(metadata))
return concat(records)
def copy_tables(tables_folder: Path, public_folder: Path) -> None:
"""
Copy tables as-is from the tables folder into the public folder.
Arguments:
tables_folder: Input folder where all CSV files exist.
public_folder: Output folder where the CSV files will be copied to.
"""
for output_file in pbar([*tables_folder.glob("*.csv")], desc="Copy tables"):
shutil.copy(output_file, public_folder / output_file.name)
def publish_subset_latest(tables_folder: Path,
output_folder: Path,
key: str = "location_key",
**tqdm_kwargs) -> List[Path]:
"""
This method outputs the latest record by date per location key for each of the input tables.
Arguments:
tables_folder: Directory containing input CSV files.
output_folder: Output path for the resulting data.
key: Column name to group by.
"""
agg_table_name = "aggregated"
# Create a latest subset version for each of the tables in parallel
map_iter = [
table for table in tables_folder.glob("*.csv")
if table.stem != agg_table_name
]
_logger.log_info(f"Computing latest subset for {len(map_iter)} tables")
map_opts = dict(total=len(map_iter),
desc="Creating latest subsets",
**tqdm_kwargs)
map_func = partial(_grouped_subset_latest, output_folder, group_column=key)
for table in pbar(map(map_func, map_iter), **map_opts):
yield table
# Use a temporary directory for intermediate files
with temporary_directory() as workdir:
latest_dates_table = workdir / "dates.csv"
latest_dates_map = _latest_date_by_group(output_folder, group_by=key)
with open(latest_dates_table, "w") as fh:
fh.write("location_key,date\n")
for location_key, date in latest_dates_map.items():
fh.write(f"{location_key},{date}\n")
join_table_paths = [latest_dates_table]
tables_in = (table for table in output_folder.glob("*.csv")
if table.stem in V3_TABLE_LIST)
for table_file in tables_in:
table_columns = get_table_columns(table_file)
if "date" not in table_columns:
join_table_paths.append(table_file)
else:
tmp_file = workdir / table_file.name
table_rename(table_file, tmp_file, {"date": None})
join_table_paths.append(tmp_file)
# Join them all into a single file for the aggregate version
output_agg = output_folder / f"{agg_table_name}.csv"
table_merge(join_table_paths, output_agg, on=[key], how="OUTER")
yield output_agg
def create_table_subsets(main_table_path: Path, output_path: Path) -> Iterable[Path]:
# Create subsets with each known key
yield from _subset_grouped_key(main_table_path, output_path, desc="Grouped key subsets")
# Create a subfolder to store the latest row for each key
latest_path = output_path / "latest"
latest_path.mkdir(parents=True, exist_ok=True)
# Create a subset with the latest known day of data for each key
map_opts = dict(desc="Latest subset")
map_func = partial(_grouped_subset_latest, latest_path)
map_iter = list(output_path.glob("*.csv")) + [main_table_path]
yield from pbar(map(map_func, map_iter), **map_opts)
def parse_dataframes(self, dataframes: Dict[str, DataFrame],
aux: Dict[str, DataFrame], **parse_opts) -> DataFrame:
data = table_rename(
dataframes[0],
{
"Country Name": "country_name",
"Country Code": "3166-1-alpha-3",
"Indicator Name": "indicator_name",
"Indicator Code": "indicator_code",
},
drop=False,
)
# Ensure all columns are of str type
data.columns = list(map(str, data.columns))
data = data.merge(aux["worldbank_indicators"]).merge(
aux["country_codes"])
data = data.drop(
columns=["country_name", "3166-1-alpha-2", "3166-1-alpha-3"])
indicators = parse_opts.get(
"indicators", {code: code
for code in data.indicator_code.values})
min_year = int(parse_opts.get("min_year", 2015))
data = data[data.indicator_code.isin(indicators.values())]
# Index data by indicator code for performance optimization
keys = data.key.unique()
indexed = {
key: data[data.key == key].set_index("indicator_code")
for key in keys
}
# There is probably a fancy pandas function to this more efficiently but this works for now
map_func = partial(self._process_record, indexed, indicators, min_year)
records = list(
pbar(map(map_func, keys),
desc="WorldBank Indicators",
total=len(keys)))
# Some countries are better described as subregions
data = DataFrame.from_records(records)
data.loc[data.key == "MF", "key"] = "FR_MF"
# Return all records in DataFrame form
return data
def parse(self, sources: List[str], aux: Dict[str, DataFrame],
**parse_opts):
data = None
with zipfile.ZipFile(sources[0]) as zipped:
data = zipped.read("WDIData.csv")
data = read_csv(BytesIO(data))
assert data is not None
data = data.rename(
columns={
"Country Code": "3166-1-alpha-3",
"Indicator Name": "indicator_name",
"Indicator Code": "indicator_code",
})
data = data.merge(aux["worldbank_indicators"]).merge(
aux["country_codes"])
data = data.drop(
columns=["Country Name", "3166-1-alpha-2", "3166-1-alpha-3"])
indicators = parse_opts.get(
"indicators", {code: code
for code in data.indicator_code.values})
min_year = int(parse_opts.get("min_year", 2015))
data = data[data.indicator_code.isin(indicators.values())]
# Index data by indicator code for performance optimization
keys = data.key.unique()
indexed = {
key: data[data.key == key].set_index("indicator_code")
for key in keys
}
# There is probably a fancy pandas function to this more efficiently but this works for now
map_func = partial(self._process_record, indexed, indicators, min_year)
records = list(
pbar(map(map_func, keys),
desc="WorldBank Indicators",
total=len(keys)))
# Some countries are better described as subregions
data = DataFrame.from_records(records)
data.loc[data.key == "MF", "key"] = "FR_MF"
# Return all records in DataFrame form
return data
def merge_location_breakout_tables(tables_folder: Path,
output_path: Path) -> None:
"""
Build a flat view of all tables combined, joined by <key> or <key, date>. This function
requires for all the location breakout tables to be present under `tables_folder`.
Arguments:
tables_folder: Input directory where all CSV files exist.
output_path: Output directory for the resulting main.csv file.
"""
# Use only the aggregated main tables
table_paths = list(sorted(tables_folder.glob("**/*.csv")))
# Concatenate all the individual breakout tables together
_logger.log_info(
f"Concatenating {len(table_paths)} location breakout tables")
table_concat(pbar(table_paths, desc="Concatenating tables"), output_path)
def _subset_grouped_key(main_table_path: Path,
output_folder: Path,
desc: str = None) -> Iterable[Path]:
""" Outputs a subsets of the table with only records with a particular key """
# Read the header of the main file to get the columns
with open(main_table_path, "r") as fd:
header = next(fd)
# Do a first sweep to get the number of keys so we can accurately report progress
key_set = set()
for line in read_lines(main_table_path, skip_empty=True):
key, data = line.split(",", 1)
key_set.add(key)
# We make use of the main table being sorted by <key, date> and do a linear sweep of the file
# assuming that once the key changes we won't see it again in future lines
key_folder: Path = None
current_key: str = None
file_handle: TextIO = None
progress_bar = pbar(total=len(key_set), desc=desc)
for idx, line in enumerate(read_lines(main_table_path, skip_empty=True)):
key, data = line.split(",", 1)
# Skip the header line
if idx == 0:
continue
# When the key changes, close the previous file handle and open a new one
if current_key != key:
if file_handle:
file_handle.close()
if key_folder:
yield key_folder / "main.csv"
current_key = key
key_folder = output_folder / key
key_folder.mkdir(exist_ok=True)
file_handle = (key_folder / "main.csv").open("w")
file_handle.write(f"{header}")
progress_bar.update(1)
file_handle.write(f"{key},{data}")
# Close the last file handle and we are done
file_handle.close()
progress_bar.close()
def test_convert_csv_to_json_records(self):
for json_convert_method in (
_convert_csv_to_json_records_fast,
_convert_csv_to_json_records_slow,
):
with temporary_directory() as workdir:
for csv_file in pbar([*(SRC / "test" / "data").glob("*.csv")],
leave=False):
json_output = workdir / csv_file.name.replace(
"csv", "json")
json_convert_method(SCHEMA, csv_file, json_output)
with json_output.open("r") as fd:
json_obj = json.load(fd)
json_df = DataFrame(data=json_obj["data"],
columns=json_obj["columns"])
csv_test_file = workdir / json_output.name.replace(
"json", "csv")
export_csv(json_df, csv_test_file, schema=SCHEMA)
_compare_tables_equal(self, csv_file, csv_test_file)
data = read_file(f"{URL_OUTPUTS_PROD}/{v2_name}.csv")
rename_columns = {
col: snake_to_camel_case(col)
for col in data.columns
}
export_csv(data.rename(columns=rename_columns),
public_folder / f"{v1_name}.csv")
# Create the v1 forecast.csv file
export_csv(
build_forecast(read_file(public_folder / "data_minimal.csv")),
public_folder / "data_forecast.csv",
)
# Convert all v1 CSV files to JSON using record format
for csv_file in pbar([*(public_folder).glob("*.csv")],
desc="V1 JSON conversion"):
data = read_file(csv_file, low_memory=False)
json_path = str(csv_file).replace("csv", "json")
data.to_json(json_path, orient="records")
# Create the v2 folder
v2_folder = public_folder / "v2"
v2_folder.mkdir(exist_ok=True, parents=True)
# Download the v2 tables which can fit under 100MB
for table_name in pbar(
(
"by-age",
"by-sex",
"demographics",
"economy",
def wikidata_property(
prop: str,
entities: List[str],
query_template: str = _WD_QUERY,
logger: ErrorLogger = ErrorLogger(),
offset: int = 0,
**tqdm_kwargs,
) -> Any:
"""
Query a single property from Wikidata, and return all entities which are part of the provided
list which contain that property.
Arguments:
prop: Wikidata property, for example P1082 for population.
entities: List of Wikidata identifiers to query the desired property.
query: [Optional] SPARQL query used to retrieve `prop`.
logger: [Optional] ErrorLogger instance to use for logging.
offset: [Optional] Number of items to skip in the result set.
Returns:
Iterable[Tuple[str, Any]]: Iterable of <Wikidata ID, property value>
"""
# Time to wait before retry in case of failure
wait_time = _INIT_WAIT_TIME
# Build the query from template
tpl = query_template + " LIMIT {limit} OFFSET {offset}"
query = tpl.format(prop=prop, limit=_LIMIT, offset=offset)
# Keep trying request until succeeds, or _max_retries is reached
for i in range(_MAX_RETRIES):
response = None
try:
start_time = time.monotonic()
params = {"query": query, "format": "json"}
req_opts = dict(headers=_REQUEST_HEADER,
params=params,
timeout=_WD_TIMEOUT)
response = requests.get(_WD_URL, **req_opts)
elapsed_time = time.monotonic() - start_time
log_opts = dict(status=response.status_code,
url=_WD_URL,
time=elapsed_time,
**params)
logger.log_info(f"Wikidata SPARQL server response", **log_opts)
data = response.json()
# Return the first binding available (there should be only one)
for item in pbar(data["results"]["bindings"], **tqdm_kwargs):
pid = item["pid"]["value"].split("/")[-1]
if pid in entities:
yield pid, item["prop"]["value"]
# Unless we got `_LIMIT` results, keep adding offset until we run our of results
if len(data["results"]["bindings"]) == _LIMIT:
yield from wikidata_property(
prop,
entities,
query_template=query_template,
logger=logger,
offset=offset + _LIMIT,
**tqdm_kwargs,
)
# If no exceptions were thrown, we have reached the end
logger.log_info(f"Wikidata SPARQL results end reached")
return
except Exception as exc:
# If we have reached the error limit, log and re-raise the error
if i + 1 >= _MAX_RETRIES:
msg = response.text if response is not None else "Unknown error"
logger.log_error(msg,
exc=exc,
traceback=traceback.format_exc())
raise exc
# Use exponential backoff in case of error
logger.log_info(
f"({i + 1}) Request error. Retry in {wait_time} seconds...",
exc=exc)
time.sleep(wait_time)
wait_time *= 2
def main():
# Create the folder which will be published
public_folder = SRC / ".." / "output" / "public"
public_folder.mkdir(exist_ok=True, parents=True)
# Create the v1 data.csv file
main_table = read_file(f"{URL_OUTPUTS_PROD}/main.csv", low_memory=False)
data = main_table[main_table.aggregation_level < 2]
rename_columns = {
"date": "Date",
"key": "Key",
"country_code": "CountryCode",
"country_name": "CountryName",
"subregion1_code": "RegionCode",
"subregion1_name": "RegionName",
"total_confirmed": "Confirmed",
"total_deceased": "Deaths",
"latitude": "Latitude",
"longitude": "Longitude",
"population": "Population",
}
data = data[rename_columns.keys()].rename(columns=rename_columns)
data = data.dropna(subset=["Confirmed", "Deaths"], how="all")
data = data.sort_values(["Date", "Key"])
export_csv(data, public_folder / "data.csv")
# Create the v1 data_minimal.csv file
export_csv(data[["Date", "Key", "Confirmed", "Deaths"]], public_folder / "data_minimal.csv")
# Create the v1 data_latest.csv file
latest = main_table[main_table.aggregation_level < 2]
latest = latest.sort_values("date").groupby("key").last().reset_index()
latest = latest[rename_columns.keys()].rename(columns=rename_columns)
latest = latest.dropna(subset=["Confirmed", "Deaths"], how="all")
latest = latest.sort_values(["Key", "Date"])
export_csv(latest, public_folder / "data_latest.csv")
# Create the v1 weather.csv file
weather = read_file(f"{URL_OUTPUTS_PROD}/weather.csv")
weather = weather[weather.key.apply(lambda x: len(x.split("_")) < 3)]
weather = weather.rename(columns={"noaa_distance": "distance", "noaa_station": "station"})
rename_columns = {col: snake_to_camel_case(col) for col in weather.columns}
export_csv(weather.rename(columns=rename_columns), public_folder / "weather.csv")
# Create the v1 mobility.csv file
mobility = read_file(f"{URL_OUTPUTS_PROD}/mobility.csv")
mobility = mobility[mobility.key.apply(lambda x: len(x.split("_")) < 3)]
mobility = drop_na_records(mobility, ["date", "key"])
rename_columns = {
col: snake_to_camel_case(col).replace("Mobility", "") for col in mobility.columns
}
export_csv(mobility.rename(columns=rename_columns), public_folder / "mobility.csv")
# Create the v1 CSV files which only require simple column mapping
v1_v2_name_map = {"response": "oxford-government-response"}
for v1_name, v2_name in v1_v2_name_map.items():
data = read_file(f"{URL_OUTPUTS_PROD}/{v2_name}.csv")
rename_columns = {col: snake_to_camel_case(col) for col in data.columns}
export_csv(data.rename(columns=rename_columns), public_folder / f"{v1_name}.csv")
# Create the v1 forecast.csv file
export_csv(
build_forecast(read_file(public_folder / "data_minimal.csv")),
public_folder / "data_forecast.csv",
)
# Convert all v1 CSV files to JSON using record format
for csv_file in pbar([*(public_folder).glob("*.csv")], desc="V1 JSON conversion"):
data = read_file(csv_file, low_memory=False)
json_path = str(csv_file).replace("csv", "json")
data.to_json(json_path, orient="records")
# Create the v2 folder
v2_folder = public_folder / "v2"
v2_folder.mkdir(exist_ok=True, parents=True)
# Download the v2 tables which can fit under 100MB
for table_name in pbar(
(
"by-age",
"by-sex",
"demographics",
"economy",
"epidemiology",
"geography",
"health",
"hospitalizations",
"index",
"mobility",
"oxford-government-response",
"weather",
"worldbank",
"worldpop",
),
desc="V2 download",
):
for ext in ("csv", "json"):
with tempfile.NamedTemporaryFile() as tmp:
tmp_path = Path(tmp.name)
download(f"{URL_OUTPUTS_PROD}/{table_name}.{ext}", tmp)
# Check that the output is less than 100 MB before copying it to the output folder
if tmp_path.stat().st_size < 100 * 1000 * 1000:
shutil.copyfile(tmp_path, v2_folder / f"{table_name}.{ext}")
def parse(self, sources: Dict[str, str], aux: Dict[str, DataFrame],
**parse_opts) -> DataFrame:
# Use a manager to handle memory accessed across processes
manager = Manager()
# Get all the weather stations with data up until last month from inventory
today = datetime.date.today()
min_date = (today - datetime.timedelta(days=30)).strftime("%Y%m%d")
stations = read_file(
sources["inventory"]).rename(columns={
"LAT": "lat",
"LON": "lon",
"ELEV(M)": "elevation"
})
stations = stations[stations.END > int(min_date)]
stations["id"] = stations["USAF"] + stations["WBAN"].apply(
lambda x: f"{x:05d}")
# Open the station data as a compressed file
with tarfile.open(sources["gsod"], mode="r:gz") as stations_tar:
# Build the station cache by decompressing all files in memory
station_cache = manager.dict()
for member in pbar(stations_tar.getmembers(),
desc="Decompressing"):
if not member.name.endswith(".csv"):
continue
# Read the records from the provided station
data = read_file(
stations_tar.extractfile(member),
file_type="csv",
usecols=_COLUMN_MAPPING.keys(),
).rename(columns=_COLUMN_MAPPING)
# Fix data types
data["noaa_station"] = data["noaa_station"].astype(str)
data["rainfall"] = data["rainfall"].apply(conv_dist)
data["snowfall"] = data["snowfall"].apply(conv_dist)
data["dew_point"] = data["dew_point"].apply(conv_temp)
for temp_type in ("average", "minimum", "maximum"):
col = f"{temp_type}_temperature"
data[col] = data[col].apply(conv_temp)
# Compute the relative humidity from the dew point and average temperature
data["relative_humidity"] = data.apply(
lambda x: relative_humidity(x["average_temperature"], x[
"dew_point"]),
axis=1)
station_cache[member.name.replace(".csv", "")] = data
# Get all the POI from metadata and go through each key
keep_columns = ["key", "latitude", "longitude"]
metadata = read_file(sources["geography"])[keep_columns].dropna()
# Only use keys present in the metadata table
metadata = metadata.merge(aux["metadata"])[keep_columns]
# Convert all coordinates to radians
stations["lat"] = stations["lat"].apply(math.radians)
stations["lon"] = stations["lon"].apply(math.radians)
metadata["lat"] = metadata["latitude"].apply(math.radians)
metadata["lon"] = metadata["longitude"].apply(math.radians)
# Make sure the stations and the cache are sent to each function call
map_func = partial(_process_location, station_cache, stations)
# We don't care about the index while iterating over each metadata item
map_iter = (record for _, record in metadata.iterrows())
# Bottleneck is network so we can use lots of threads in parallel
records = process_map(map_func, map_iter, total=len(metadata))
return concat(records)
def make_main_table(tables_folder: Path, output_path: Path) -> None:
"""
Build a flat view of all tables combined, joined by <key> or <key, date>.
Arguments:
tables_folder: Input folder where all CSV files exist.
Returns:
DataFrame: Flat table with all data combined.
"""
# Use a temporary directory for intermediate files
with TemporaryDirectory() as workdir:
workdir = Path(workdir)
# Merge all output files into a single table
keys_table_path = workdir / "keys.csv"
keys_table = read_file(tables_folder / "index.csv", usecols=["key"])
export_csv(keys_table, keys_table_path)
print("Created keys table")
# Add a date to each region from index to allow iterative left joins
max_date = (datetime.datetime.now() +
datetime.timedelta(days=1)).date().isoformat()
date_list = [
date.date().isoformat()
for date in date_range("2020-01-01", max_date)
]
date_table_path = workdir / "dates.csv"
export_csv(DataFrame(date_list, columns=["date"]), date_table_path)
print("Created dates table")
# Create a temporary working table file which can be used during the steps
temp_file_path = workdir / "main.tmp.csv"
table_cross_product(keys_table_path, date_table_path, temp_file_path)
print("Created cross product table")
# Add all the index columns to seed the main table
main_table_path = workdir / "main.csv"
table_join(temp_file_path, tables_folder / "index.csv", ["key"],
main_table_path)
print("Joined with table index")
non_dated_columns = set(get_table_columns(main_table_path))
for table_file_path in pbar([*tables_folder.glob("*.csv")],
desc="Make main table"):
table_name = table_file_path.stem
if table_name not in EXCLUDE_FROM_MAIN_TABLE:
table_columns = get_table_columns(table_file_path)
if "date" in table_columns:
join_on = ["key", "date"]
else:
join_on = ["key"]
# Keep track of columns which are not indexed by date
non_dated_columns = non_dated_columns | set(table_columns)
# Iteratively perform left outer joins on all tables
table_join(main_table_path, table_file_path, join_on,
temp_file_path)
shutil.move(temp_file_path, main_table_path)
print(f"Joined with table {table_name}")
# Drop rows with null date or without a single dated record
# TODO: figure out a memory-efficient way to do this
# Ensure that the table is appropriately sorted ans write to output location
table_sort(main_table_path, output_path)
print("Sorted main table")
