commit 0ccbaf2b264ca194a30b829016aa5bc5239c6a18
Author: Sven Augustin <sven.augustin@psi.ch>
Date:   Fri Mar 26 01:18:40 2021 +0100

    first prototype

diff --git a/elogdump.py b/elogdump.py
new file mode 100755
index 0000000..08aeecc
--- /dev/null
+++ b/elogdump.py
@@ -0,0 +1,181 @@
+#!/usr/bin/env python
+
+import argparse
+
+parser = argparse.ArgumentParser(
+    description="Dump an elog ...",
+    formatter_class=argparse.ArgumentDefaultsHelpFormatter
+)
+
+parser.add_argument("url", help="elog URL, e.g., https://elog-gfa.psi.ch/SwissFEL+test/")
+parser.add_argument("-o", "--output", default="dump", help="Output folder")
+parser.add_argument("-a", "--attachments", default="attachments",
+    help="Attachments sub-folder relative to the output folder"
+)
+
+clargs = parser.parse_args()
+
+
+
+import builtins
+import functools
+import json
+import os
+import shutil
+
+from tqdm import tqdm
+import elog
+import urllib3
+
+
+# Certs are not valid...
+urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
+http = urllib3.PoolManager(cert_reqs="CERT_NONE")
+
+
+
+class ELogScraper:
+
+    def __init__(self, url, output_folder=".", attachment_subfolder="attachments"):
+        self.url = url = url if url.endswith("/") else url + "/" #TODO: only needed for attachments bug!
+
+        self.output_folder = output_folder
+        mkdirs(output_folder)
+
+        self.attachment_folder = attachment_folder = os.path.join(output_folder, attachment_subfolder)
+        self.fd = FileDownloader(attachment_folder)
+
+        self.lb = elog.open(url)
+        self.elog_read = retry(self.lb.read)
+
+        mids = self.lb.get_message_ids()
+        self.mids = sorted(mids)
+        self.nmsgs = nmsgs = len(mids)
+        self.counter_width = len(str(nmsgs))
+
+
+    def dump(self):
+        print()
+        print(f"Dumping {self.nmsgs} messages from {self.url}")
+        print(f"- Messages to:    {self.output_folder}")
+        print(f"- Attachments to: {self.attachment_folder}")
+        print()
+        try:
+            builtins.print = tqdm.write # otherwise print() breaks tqdm
+            for msg in tqdm(self.get_entries(), total=self.nmsgs):
+                pass
+        except KeyboardInterrupt:
+            raise SystemExit(f"\nDump not finished! You might want to delete the \"{output}\" folder.")
+        finally:
+            builtins.print = print
+
+
+    def get_entries(self):
+        for i in self.mids:
+            yield self.get_entry(i)
+
+
+    def get_entry(self, index):
+        message, attributes, attachments = self.elog_read(index)
+        attributes = sanitize_attributes(index, attributes)
+        attachments = sanitize_attachments(attachments, self.url)
+        fns = self.fd.get(attachments)
+        entry = build_entry(index, message, attributes, fns)
+
+        counter = str(index).zfill(self.counter_width)
+        fname = f"msg{counter}.json"
+        fname = os.path.join(self.output_folder, fname)
+
+        json_dump(entry, fname)
+        return entry
+
+
+
+def retry(func):
+    @functools.wraps(func)
+    def wrapper(*args, **kwargs):
+        n = 1
+        while True:
+            try:
+                res = func(*args, **kwargs)
+            except Exception as e:
+                print_func = func.__name__
+                all_args = [str(a) for a in args] + ["{k}={v}" for k, v in kwargs.items()]
+                print_args = ", ".join(all_args)
+                print(f"retry #{n}: {print_func}({print_args}), failed  due to:\n{e}")
+                n += 1
+            else:
+                return res
+    return wrapper
+
+def sanitize_attributes(i, attributes):
+    mid = attributes.pop("$@MID@$")
+    mid = int(mid)
+    assert i == mid
+    attributes["MID"] = i
+    return attributes
+
+def sanitize_attachments(attachments, url):
+    if attachments == [url]: #TODO: WTF?!
+        attachments = []
+    return attachments
+
+def build_entry(i, message, attributes, attachments):
+    entry = {}
+    entry.update(attributes)
+    entry["attachments"] = attachments
+    entry["message"] = message
+    return entry
+
+def json_dump(data, fname):
+    with open(fname, "w") as f:
+        json.dump(data, f, sort_keys=True, indent=4)
+
+
+
+class FileDownloader:
+
+    def __init__(self, folder="."):
+        self.folder = folder
+        mkdirs(folder)
+
+    def get(self, urls):
+        return [self.get_file(u) for u in urls]
+
+    def get_file(self, url):
+        fname = extract_filename(url)
+        full_fname = os.path.join(self.folder, fname)
+#        print(f"{url} -> {fname}")
+        download(url, full_fname)
+        return fname
+
+
+
+def extract_filename(url):
+    parsed_url = urllib3.util.parse_url(url)
+    path = parsed_url.path
+    fname = os.path.basename(path)
+    return fname
+
+def download(url, fname):
+    with http.request("GET", url, preload_content=False) as resp:
+        with open(fname, "wb") as f:
+            shutil.copyfileobj(resp, f)
+    resp.release_conn()
+
+def mkdirs(folder):
+    os.makedirs(folder, exist_ok=True)
+
+
+
+
+
+if __name__ == "__main__":
+    url = clargs.url
+    output = clargs.output
+    attachments = clargs.attachments
+    els = ELogScraper(url, output_folder=output, attachment_subfolder=attachments)
+    els.dump()
+
+
+