troggle/parsers/logbooks.py

import os
import re
import sys
import time

from datetime import date, datetime
from pathlib import Path
from random import randint

from django.conf import settings
from django.template.defaultfilters import slugify

from parsers.people import GetPersonExpeditionNameLookup, load_people_expos
from troggle.core.models.caves import GetCaveLookup, LogbookEntry, PersonTrip
from troggle.core.models.troggle import DataIssue, Expedition
from troggle.core.utils import get_process_memory

"""
Parses and imports logbooks in all their wonderful confusion
   See detailed explanation of the complete process:
    https://expo.survex.com/handbook/computing/logbooks-parsing.html
"""
todo = """
- Most of the time is during the database writing (6s out of 8s).

- this is a slow and uncertain function too:  cave = getCaveByReference(caveRef)

- pre-compile all the heavily used regular expressions !

- profile the code to find bad repetitive things, of which there are many.

- attach or link a DataIssue to an individual expo (logbook) so that it can be found and deleted

- replace explicit 1970 date with a constant EPOCH

- rewrite to use generators rather than storing everything intermediate in lists - to reduce memory impact.
  
- We should ensure logbook.html is utf-8 and stop this crap:             
            file_in = open(logbookfile,'rb')
            txt = file_in.read().decode("latin1")
            

- use Fixtures https://docs.djangoproject.com/en/4.1/ref/django-admin/#django-admin-loaddata to cache
data for old logbooks? Not worth it..

"""
MAX_LOGBOOK_ENTRY_TITLE_LENGTH = 200
BLOG_PARSER_SETTINGS = { # no default, must be explicit
    #  "2022": ("ukcavingblog.html", "parser_blog"), # now folded in to logbooks.html
    #  "2019": ("ukcavingblog.html", "parser_blog"), # now folded in to logbooks.html
    #  "2018": ("ukcavingblog.html", "parser_blog"), # now folded in to logbooks.html
    #  "2017": ("ukcavingblog.html", "parser_blog"), # now folded in to logbooks.html
}
DEFAULT_LOGBOOK_FILE = "logbook.html"
DEFAULT_LOGBOOK_PARSER = "parser_html"
# All years now (Jan.2023) use the default value for Logbook parser
# dont forget to update expoweb/pubs.htm to match. 1982 left as reminder of expected format.
LOGBOOK_PARSER_SETTINGS = {
    "1982": ("logbook.html", "parser_html"),
}

ENTRIES = {
    "2022": 90,
    "2019": 55,
    "2018": 95,
    "2017": 74,
    "2016": 86,
    "2015": 80,
    "2014": 66,
    "2013": 52,
    "2012": 76,
    "2011": 71,
    "2010": 22,
    "2009": 53,
    "2008": 49,
    "2007": 113,
    "2006": 60,
    "2005": 55,
    "2004": 76,
    "2003": 42,
    "2002": 31,
    "2001": 49,
    "2000": 54,
    "1999": 79,
    "1998": 43,
    "1997": 53,
    "1996": 95,
    "1995": 42,
    "1994": 32,
    "1993": 41,
    "1992": 62,
    "1991": 39,
    "1990": 87,
    "1989": 63,
    "1988": 61,
    "1987": 34,
    "1985": 24,
    "1984": 32,
    "1983": 52,
    "1982": 42,
}

logentries = []  # the entire logbook for one year is a single object: a list of entries
noncaveplaces = ["travel", "Journey", "Loser Plateau", "UNKNOWN", "plateau", "base camp", "basecamp", "top camp", "topcamp"]

def set_trip_id(year, seq):
    tid = f"{year}_s{seq:02d}"
    return tid

rx_tripperson = re.compile(r"(?i)<u>(.*?)</u>$")
rx_round_bracket = re.compile(r"[\(\[].*?[\)\]]")

def GetTripPersons(trippeople, expedition, logtime_underground, tid=None):
    res = []
    author = None
    # print(f'# {tid}')
    # print(f" -  {tid} '{trippeople}'  ")

    for tripperson in re.split(r",|\+|&amp;|&(?!\w+;)| and ", trippeople):
        tripperson = tripperson.strip()
        # mul = re.match(r"(?i)<u>(.*?)</u>$", tripperson)
        mul = rx_tripperson.match(tripperson)
        if mul:
            tripperson = mul.group(1).strip()
        if tripperson and tripperson[0] != "*":
            tripperson = re.sub(rx_round_bracket, "", tripperson).strip()

            # these aliases should be moved to people.py GetPersonExpeditionNameLookup(expedition)
            if tripperson == "Wiggy":
                tripperson = "Phil Wigglesworth"
            if tripperson == "Animal":
                tripperson = "Mike Richardson"
            if tripperson == "MikeTA":
                tripperson = "Mike Richardson"
            if tripperson == "CavingPig":
                tripperson = "Elaine Oliver"
            if tripperson == "nobrotson":
                tripperson = "Rob Watson"
            if tripperson == "Tinywoman":
                tripperson = "Nadia"
            if tripperson == "tcacrossley":
                tripperson = "Tom Crossley"
            if tripperson == "Samouse1":
                tripperson = "Todd Rye"

            personyear = GetPersonExpeditionNameLookup(expedition).get(tripperson.lower())
            if not personyear:
                message = f" ! - {expedition.year} No name match for: '{tripperson}' in entry {tid=} for this expedition year."
                print(message)
                DataIssue.objects.create(parser="logbooks", message=message)
            res.append((personyear, logtime_underground))
            if mul:
                author = personyear
    if not author:
        if not res:
            return "", 0
        author = res[-1][0]  # the previous valid person and a time of 0 hours

    # print(f" -  {tid}  [{author.person}] '{res[0][0].person}'...")
    return res, author

def tidy_time_underground(logtime_underground):
    # Nasty hack, must tidy this up..
    if logtime_underground:
        try:
            logtime_underground = float(logtime_underground)
        except:
            # print(f"logtime_underground = {logtime_underground}")
            tu_match = re.match(r"(T/U:\s*)?(\d+[.]?\d*).*", logtime_underground)
            if tu_match:
                # print(f"logtime_underground = {tu_match.group(2)}")
                logtime_underground = float(tu_match.group(2))
            else:
                logtime_underground = 0
    else:
        logtime_underground = 0
    return logtime_underground

def tidy_trip_persons(trippeople, expedition, logtime_underground, tid):
    try:
        trippersons, author = GetTripPersons(trippeople, expedition, logtime_underground, tid=tid)
        # print(f" - {author} - {logtime_underground}")
    except:
        message = f" ! - {expedition.year} Skipping logentry: {title} - GetTripPersons FAIL"
        DataIssue.objects.create(parser="logbooks", message=message)
        print(message)
        # raise
        return

    if not author:
        message = f" ! - {expedition.year} Warning: logentry: {title} - no expo member author for entry '{tid}'"
        DataIssue.objects.create(parser="logbooks", message=message)
        print(message)
        
    return trippersons, author
    
def tidy_trip_cave(place):
    #  GetCaveLookup() need to work  better. None of this data is *used* though?
    # 'tripcave' is converted to a string doing this, which renders as the cave slug.
 
    lplace = place.lower()
    cave = None
    if lplace not in noncaveplaces:
        cave = GetCaveLookup().get(lplace)

    return cave

def tidy_trip_image_urls(text, date):
    y = str(date)[:4]

    text = text.replace(' src="', f' src="/years/{y}/')
    text = text.replace(" src='", f" src='/years/{y}/")

    text = text.replace(f' src="/years/{y}//years/{y}/', f' src="/years/{y}/')
    text = text.replace(f" src='/years/{y}//years/{y}/", f" src='/years/{y}/")

    text = text.replace("\t", "")
    text = text.replace("\n\n\n", "\n\n")
    return text

def tidy_tid(tid, title):

    if tid is not None:
        return tid

    # print(f"!    {title=} ")
    tid = str(randint(1000, 9999)) + "_" + slugify(title)[:10].replace("-", "_")    
    return tid
    
def store_entry_into_database(date, place, tripcave, title, text, trippersons, author, expedition, logtime_underground, tid):
    """saves a single logbook entry and related persontrips
    Does NOT save the expeditionday_id  - all NULLs. why? Because we are deprecating expeditionday !
    """
    
    # gets the current ExpeditionDay, and saves it as an object attached to 
    # the expedition, but does not attach it to the logbook entry. Why ?
    
    # expedition.get_expedition_day(date)

    nonLookupAttribs = {
        "place": place,
        "text": text,
        "expedition": expedition,
        "time_underground": logtime_underground,
        "cave_slug": str(tripcave),
        "slug": tid,
    }
    lookupAttribs = {"date": date, "title": title}
    lbo = LogbookEntry.objects.create(**nonLookupAttribs, **lookupAttribs)
    
    for tripperson, time_underground in trippersons:
        lookupAttribs = {"personexpedition": tripperson, "logbook_entry": lbo}
        nonLookupAttribs = {"time_underground": time_underground, "is_logbook_entry_author": (tripperson == author)}
        pt = PersonTrip.objects.create(**nonLookupAttribs, **lookupAttribs)
        
def parser_date(tripdate, year):
    """Interprets dates in the expo logbooks and returns a correct datetime.date object"""
    dummydate = date(1970, 1, 1) # replace with _EPOCH
    month = 1
    day = 1
    # message = f" ! - Trying to parse date in logbook: {tripdate} - {year}"
    # print(message)
    try:
        mdatestandard = re.match(r"(\d\d\d\d)-(\d\d)-(\d\d)", tripdate)
        mdategoof = re.match(r"(\d\d?)/0?(\d)/(20|19)?(\d\d)", tripdate)
        if mdatestandard:
            if not (mdatestandard.group(1) == year):
                message = f" ! - Bad date (year) in logbook: {tripdate} - {year}"
                DataIssue.objects.create(parser="logbooks", message=message)
                return dummydate
            else:
                year, month, day = int(mdatestandard.group(1)), int(mdatestandard.group(2)), int(mdatestandard.group(3))
        elif mdategoof:
            if not (not mdategoof.group(3) or mdategoof.group(3) == year[:2]):
                message = " ! - Bad date mdategoof.group(3) in logbook: " + tripdate + " - " + mdategoof.group(3)
                DataIssue.objects.create(parser="logbooks", message=message)
                return dummydate
            else:
                yadd = int(year[:2]) * 100
                day, month, year = int(mdategoof.group(1)), int(mdategoof.group(2)), int(mdategoof.group(4)) + yadd
        else:
            year = 1970 # replace with _EPOCH
            message = f" ! - Bad date in logbook: {tripdate} - {year}"
            DataIssue.objects.create(parser="logbooks", message=message)

        return date(year, month, day)
    except:
        message = f" ! - Failed to parse date in logbook: {tripdate} - {year}"
        DataIssue.objects.create(parser="logbooks", message=message)
        return datetime.date(1970, 1, 1) # replace with _EPOCH


def parser_html(year, expedition, txt, seq=""):
    """This uses some of the more obscure capabilities of regular expressions,
    see https://docs.python.org/3/library/re.html

    You can't see it here, but a round-trip export-then-import will move
    the endmatter up to the frontmatter. This made sense when translating
    from parser_html_01 format logfiles, believe me.
    """
    logentries = []
    dupl = {}

    # extract front material and stash for later use when rebuilding from list of entries
    headmatch = re.match(r"(?i)(?s).*<body[^>]*>(.*?)<hr.*", txt)
    headpara = headmatch.groups()[0].strip()

    # print(f" - headpara:\n'{headpara}'")
    if len(headpara) > 0:
        frontpath = Path(settings.EXPOWEB, "years", year, "frontmatter.html")
        with open(frontpath, "w") as front:
            front.write(headpara + "\n")

    # extract END material and stash for later use when rebuilding from list of entries
    endmatch = re.match(r"(?i)(?s).*<hr\s*/>([\s\S]*?)(?=</body)", txt)
    endpara = endmatch.groups()[0].strip()

    # print(f" - endpara:\n'{endpara}'")
    if len(endpara) > 0:
        endpath = Path(settings.EXPOWEB, "years", year, "endmatter.html")
        with open(endpath, "w") as end:
            end.write(endpara + "\n")

    tripparas = re.findall(r"<hr\s*/>([\s\S]*?)(?=<hr)", txt)
    logbook_entry_count = 0
    for trippara in tripparas:
        logbook_entry_count += 1
        tid = set_trip_id(year, logbook_entry_count)
        # print(f' - new tid:{tid} lbe count: {logbook_entry_count}')

        s = re.match(
            r"""(?x)(?:\s*<div\sclass="tripdate"\sid=".*?">.*?</div>\s*<p>)?  # second date
                            \s*(?:<a\s+id="(.*?)"\s*/>\s*</a>)?
                            \s*<div\s+class="tripdate"\s*(?:id="(.*?)")?>(.*?)</div>(?:<p>)?
                            \s*<div\s+class="trippeople">\s*(.*?)</div>
                            \s*<div\s+class="triptitle">\s*(.*?)</div>
                            ([\s\S]*?)
                            \s*(?:<div\s+class="timeug">\s*(.*?)</div>)?
                            \s*$
                     """,
            trippara,
        )
        if s:
            tripid, tripid1, tripdate, trippeople, triptitle, triptext, tu = s.groups()
        else:  # allow title and people to be swapped in order
            msg = f" !- {year} Can't parse:{logbook_entry_count} '{trippara[:50]}'..."
            print(msg)
            DataIssue.objects.create(parser="logbooks", message=msg)

            s2 = re.match(
                r"""(?x)(?:\s*<div\sclass="tripdate"\sid=".*?">.*?</div>\s*<p>)?  # second date
                                \s*(?:<a\s+id="(.*?)"\s*/>\s*</a>)?
                                \s*<div\s+class="tripdate"\s*(?:id="(.*?)")?>(.*?)</div>(?:<p>)?
                                \s*<div\s+class="triptitle">\s*(.*?)</div>
                                \s*<div\s+class="trippeople">\s*(.*?)</div>
                                ([\s\S]*?)
                                \s*(?:<div\s+class="timeug">\s*(.*?)</div>)?
                                \s*$
                         """,
                trippara,
            )
            if s2:
                tripid, tripid1, tripdate, triptitle, trippeople, triptext, tu = s2.groups()
            else:
                # if not re.search(r"Rigging Guide", trippara):
                msg = f" !- Logbook. Can't parse entry on 2nd pass:{logbook_entry_count} '{trippara[:50]}'..."
                print(msg)
                DataIssue.objects.create(parser="logbooks", message=msg)
                continue

        ldate = parser_date(tripdate.strip(), year)
        triptitles = triptitle.split(" - ")
        if len(triptitles) >= 2:
            place = triptitles[0]
        else:
            place = "UNKNOWN"
        tripcontent = re.sub(r"</p>", "", triptext)
        tripcontent = re.sub(r"<p>", "<br /><br />", tripcontent).strip()

        triptitle = triptitle.strip()
        # triptitle must be unique for a given date. We fix this here.
        check = (ldate, triptitle)
        if check in dupl:
            dupl[check] += 1
            triptitle = f"{triptitle} #{dupl[check]}"
            print(f"  - {triptitle} -- {date}")
        else:
            dupl[check] = 1
            
        tu = tidy_time_underground(tu)
        trippersons, author = tidy_trip_persons(trippeople, expedition, tu, tid)
        tripcave = tidy_trip_cave(place)
        tripcontent = tidy_trip_image_urls(tripcontent, date)
        tid = tidy_tid(tid, triptitle)
   
        entrytuple = (ldate, place, tripcave, triptitle, tripcontent, trippersons, author, expedition, tu, tid)
        logentries.append(entrytuple)
    return logentries


def parser_blog(year, expedition, txt, sq=""):
    """Parses the format of web pages collected as 'Save As HTML" from the UK Caving blog website.
    Note that the entries have dates and authors, but no titles.
    See detailed explanation of the complete process:
    https://expo.survex.com/handbook/computing/logbooks-parsing.html
    https://expo.survex.com/handbook/computing/log-blog-parsing.html

    This uses some of the more obscure capabilities of regular expressions,
    see https://docs.python.org/3/library/re.html

    BLOG entries have this structure:
        <article ... data-author="Tinywoman" data-content="post-298780" id="js-post-298780">
            <article class="message-body js-selectToQuote">
            </article>
        </article>
    So the content is nested inside the header. Attachments (images) come after the content.
    It's a bugger, but it's out of our control.
    """
    logentries = []

    tripheads = re.findall(
        r"<article class=\"message message--post js-post js-inlineModContainer\s*\"\s*([\s\S]*?)(?=</article)", txt
    )
    if not (tripheads):
        message = f" ! - Skipping on failure to parse article header: {txt[:500]}"
        print(message)

    # (?= is a non-consuming match, see https://docs.python.org/3/library/re.html
    tripparas = re.findall(
        r"<article class=\"message-body js-selectToQuote\"\>\s*([\s\S]*?)(</article[^>]*>)([\s\S]*?)(?=</article)", txt
    )
    if not (tripparas):
        message = f" ! - Skipping on failure to parse article content: {txt[:500]}"
        print(message)

    if len(tripheads) != len(tripparas):
        print(f"{len(tripheads)} != {len(tripparas)}")
    print(f"{len(tripheads)} - {len(tripparas)}")

    location = "Plateau"  # best guess, fix manually later
    tu = 0 # no logged time underground in a blog entry
    logbook_entry_count = 0
    for i in range(0, len(tripparas)):
        tripstuff = tripparas[i]
        attach = tripstuff[2]
        # note use on non-greedy *? regex idiom here
        attach = re.sub(r"<div class=\"file-content\">[\s\S]*?(?=</li>)", "", attach)
        attach = re.sub(r"<footer[\s\S]*(</footer>)", "", attach)
        tripcontent = tripstuff[0] + attach
        # print(f"{i} - {len(tripstuff)} - {tripstuff[1]}")
        triphead = tripheads[i]
        logbook_entry_count += 1
        tid = set_trip_id(year, logbook_entry_count) + "_blog" + sq
        # print(f" -  tid: {tid}")

        # data-author="tcacrossley"
        match_author = re.search(r".*data-author=\"([^\"]*)\" data-content=.*", triphead)
        if not (match_author):
            message = f" ! - Skipping logentry {year}:{logbook_entry_count} on failure to parse data-author  {tid} {triphead[:400]}..."
            DataIssue.objects.create(parser="logbooks", message=message)
            print(message)
            break
        trippeople = match_author.group(1)
        # print(f" -  tid: {tid} {trippeople}")
        # datetime="2019-07-11T13:16:18+0100"
        match_datetime = re.search(r".*datetime=\"([^\"]*)\" data-time=.*", triphead)
        if not (match_datetime):
            message = f" ! - Skipping logentry {year}:{logbook_entry_count} on failure to parse datetime  {tid} {triphead[:400]}..."
            DataIssue.objects.create(parser="logbooks", message=message)
            print(message)
            break
        datestamp = match_datetime.group(1)

        try:
            tripdate = datetime.fromisoformat(datestamp)
        except:
            message = f" ! - FROMISOFORMAT fail logentry {year}:{logbook_entry_count} {tid} '{datestamp}'"
            DataIssue.objects.create(parser="logbooks", message=message)
            print(message)
            # fallback, ignore the timestamp bits:
            tripdate = datetime.fromisoformat(datestamp[0:10])
        # print(f" -  tid: {tid} '{trippeople}' '{tripdate}'")

        # triptitle must have the location then a hyphen at the beginning as it is ignored by export function. We can't know what this is, so we set it as 'Expo' and 'Unknown'.
        place = "Unknown"
        # triptitle must be unique for a given date. We can enforce this here.
        triptitle = f"Expo - UK Caving Blog{sq} post {logbook_entry_count}"  
        tripcontent = re.sub(r"(width=\"\d+\")", "", tripcontent)
        tripcontent = re.sub(r"height=\"\d+\"", "", tripcontent)
        tripcontent = re.sub(r"width: \d+px", "", tripcontent)
        tripcontent = re.sub(r"\n\n+", "\n\n", tripcontent)
        tripcontent = re.sub(r"<hr\s*>", "", tripcontent)
        tripcontent = f"\n\n<!-- Content parsed from UK Caving Blog -->\nBlog Author: {trippeople}" + tripcontent

        trippersons, author = tidy_trip_persons(trippeople, expedition, logtime_underground, tid)
        tripcave = tidy_trip_cave(place)
        tripcontent = tidy_trip_image_urls(tripcontent, date)
        tid = tidy_tid(tid, triptitle)

        entrytuple = (tripdate, place, tripcave, triptitle, tripcontent, trippersons, author, expedition, tu, tid)
        logentries.append(entrytuple)
    return logentries

def clean_all_logbooks():
    DataIssue.objects.filter(parser="logbooks").delete()
    LogbookEntry.objects.all().delete()    
       
def clean_logbook_for_expedition(expedition):
    """Only used when loading a single logbook. Deletes database LogBookEntries and  
    DataIssues for this expedition year.
    """
    lbes = LogbookEntry.objects.filter(expedition=expedition).delete() 
    dataissues = DataIssue.objects.filter(parser="logbooks")
    for di in dataissues:
        ph = expedition.year
        if re.search(ph, di.message) is not None:  # SLOW just to delete issues for one year
            # print(f'   - CLEANING dataissue {di.message}')
            di.delete()

def parse_logbook_for_expedition(expedition, blog=False):
    """Parses all logbook entries for one expedition
    """
    global ENTRIES
    logentries = [] 
    
    logbook_parseable = False
    expologbase = Path(settings.EXPOWEB, "years")
 
    year = expedition.year
    expect = ENTRIES[year]
    # print(" - Logbook for: " + year)

    if year in LOGBOOK_PARSER_SETTINGS:
        yearfile, parsefunc = LOGBOOK_PARSER_SETTINGS[year]
        expedition.logbookfile = yearfile # don't change this if a blog
    else:
        yearfile = DEFAULT_LOGBOOK_FILE
        expedition.logbookfile = DEFAULT_LOGBOOK_FILE # don't change this if a blog
        parsefunc = DEFAULT_LOGBOOK_PARSER
        
    if blog:
        print(f" - BLOG file {yearfile} using parser {parsefunc}")
        if year not in  BLOG_PARSER_SETTINGS:
            message = f" ! - Expecting blog parser buut none specified for {year}"
            DataIssue.objects.create(parser="logbooks", message=message)
            print(message)
        else:
            yearfile, parsefunc = BLOG_PARSER_SETTINGS[year]

    logbookpath = Path(yearfile)
    # print(f" - Logbook file {yearfile} using parser {parsefunc}")
    # expedition.save()

    for sq in ["", "2", "3", "4"]:  # cope with blog saved as many separate files
        lb = Path(expologbase, year, logbookpath.stem + sq + logbookpath.suffix)
        if not (lb.is_file()):
            # print(f"   ! End of blog. Next blog file in sequence not there:{lb}")
            break
        try:
            with open(lb, "rb") as file_in:
                txt = file_in.read().decode("utf-8")
            logbook_parseable = True
        except (IOError):
            logbook_parseable = False
            print(f"   ! Couldn't open logbook as UTF-8 {lb}")
        except:
            logbook_parseable = False
            print(f"   ! Very Bad Error opening {lb}")

        if logbook_parseable:
            # --------------------
            parser = globals()[parsefunc]
            print(f" - {year} parsing with {parsefunc} - {lb}")
            logentries = parser(year, expedition, txt, sq)  # this launches the right parser
            # --------------------

    if len(logentries) == expect:
        # print(f"OK  {year} {len(logentries):5d} is {expect}\n")
        pass
    else:
        print(f"Mismatch in number of log entries: {year} {len(logentries):5d} is not {expect}\n")

    return logentries


def LoadLogbook(year):
    """One off logbook for testing purposes, and also reloadable on '/expedition/2022?reload'
    This is inside an atomic transaction"""

    expo = Expedition.objects.get(year=year)
    year = expo.year  # some type funny
    clean_logbook_for_expedition(expo)
    logentries = []
    
    logentries = parse_logbook_for_expedition(expo)  # this actually loads the logbook for one expo
    if year in BLOG_PARSER_SETTINGS:
         logentries += parse_logbook_for_expedition(expo, blog=True)  # this  loads the blog logbook
    else:
        print(
            f" - Not a year with extant blog entries to import: '{year}' not in BLOG_PARSER_SETTINGS {BLOG_PARSER_SETTINGS}"
        )
    for entrytuple in logentries:
        date, place, tripcave, triptitle, text, trippersons, author, expedition, tu, tid = entrytuple
        if expo == expedition: # unneeded check, we zeroed it before filling it
            #print(f" - {triptitle}")
            store_entry_into_database(date, place, tripcave, triptitle, text, trippersons, author, expedition, tu, tid)
        else:
            print(f" ! unexpected log entry labelled as '{expedition}' {tid}" ) 
    expo.save() # to save logbook name property
    
def LoadLogbooks():
    """This is the master function for parsing all logbooks into the Troggle database.
    This should be rewritten to use coroutines to load all logbooks from disc in parallel,
    but must be serialised to write to database as sqlite is single-user.
    
    This is inside an atomic transaction. Maybe it shouldn't be..
    """
    global ENTRIES
    global logentries
    allentries = []
    mem1 = get_process_memory()
    print(f" - MEM:{mem1:7.2f} MB now ", file=sys.stderr)
    start = time.time()

    clean_all_logbooks()
    expos = Expedition.objects.all()
    if len(expos) <= 1:
        message = " ! - No expeditions found. Attempting to 'people' first"
        DataIssue.objects.create(parser="logbooks", message=message)
        print(message)
        load_people_expos()
        expos = Expedition.objects.all()
        if len(expos) <= 1:
            message = " ! - No expeditions found, even after attempting to load 'people'. Abort."
            DataIssue.objects.create(parser="logbooks", message=message)
            print(message)
            return

    noexpo = [
        "1986",
        "2020",
        "2021",
    ]  # no expo
    lostlogbook = ["1976", "1977", "1978", "1979", "1980", "1981"]
    sqlfail = [""]  # breaks mysql with db constraint fail - all now fixed.]
    nologbook = noexpo + lostlogbook + sqlfail

    nlbe = {}
    loglist = []
    bloglist = []

    for expo in expos: 
        year = expo.year
        if year in sqlfail:
            print(" - Logbook for: " + year + " NO parsing attempted - known sql failures")
            message = f" ! - Not even attempting to parse logbook for {year} until code fixed"
            DataIssue.objects.create(parser="logbooks", message=message)
            print(message)

        if year not in nologbook:
            if year in ENTRIES:
                loglist.append(expo)
            else:
                print(" - No Logbook yet for: " + year)  # catch case when preparing for next expo

        if year in BLOG_PARSER_SETTINGS:
            bloglist.append(expo)

    for ex in loglist:
        logentries = parse_logbook_for_expedition(ex)  # this  loads the logbook for one expo
        allentries += logentries

    for b in bloglist:
        print(f" - BLOG: {b}")
        logentries = parse_logbook_for_expedition(b, blog=True)  # loads the blog logbook for one expo
        allentries += logentries

    print(f"total {len(allentries):,} log entries parsed in all expeditions")
    mem = get_process_memory()
    print(f" - MEM: {mem:7.2f} MB in use, {mem-mem1:7.2f} MB more", file=sys.stderr)
    duration = time.time() - start
    print(f" - TIME: {duration:7.2f} s", file=sys.stderr)
   
    # Now we serially store the parsed data in the database, updating 3 types of object:
    # - Expedition (the 'logbook.html' value)
    # - LogBookEntry (text, who when etc.)
    # - PersonTrip (who was on that specific trip mentione din the logbook entry)
    for entrytuple in allentries:
        date, place, tripcave, triptitle, text, trippersons, author, expedition, tu, tid = entrytuple
        store_entry_into_database(date, place, tripcave, triptitle, text, trippersons, author, expedition, tu, tid)
 
    for expo in expos: 
        expo.save() # to save logbook name property
    mem = get_process_memory()
    print(f" - MEM: {mem:7.2f} MB in use, {mem-mem1:7.2f} MB more", file=sys.stderr)
    duration = time.time() - start
    print(f" - TIME: {duration:7.2f} s", file=sys.stderr)
# dateRegex = re.compile(r'<span\s+class="date">(\d\d\d\d)-(\d\d)-(\d\d)</span>', re.S)
# expeditionYearRegex = re.compile(r'<span\s+class="expeditionyear">(.*?)</span>', re.S)
# titleRegex = re.compile(r'<H1>(.*?)</H1>', re.S)
# reportRegex = re.compile(r'<div\s+class="report">(.*)</div>\s*</body>', re.S)
# personRegex = re.compile(r'<div\s+class="person">(.*?)</div>', re.S)
# nameAuthorRegex = re.compile(r'<span\s+class="name(,author|)">(.*?)</span>', re.S)
# TURegex = re.compile(r'<span\s+class="TU">([0-9]*\.?[0-9]+)</span>', re.S)
# locationRegex = re.compile(r'<span\s+class="location">(.*?)</span>', re.S)
# caveRegex = re.compile(r'<span\s+class="cave">(.*?)</span>', re.S)