move postgres/rest directory

1 files changed, 131 insertions, 0 deletions

diff --git a/postgrest/backfill/backfill_cdx.py b/postgrest/backfill/backfill_cdx.py
new file mode 100755
index 0000000..1c452ca
--- /dev/null
+++ b/postgrest/backfill/backfill_cdx.py
@@ -0,0 +1,131 @@
+#!/usr/bin/env python3
+"""
+This is a "one-time" tranform helper script for CDX backfill into sandcrawler
+postgresql.
+
+Most of this file was copied from '../python/common.py'.
+"""
+
+import json, os, sys, collections
+import base64
+import psycopg2
+import psycopg2.extras
+
+NORMAL_MIME = (
+    'application/pdf',
+    'application/postscript',
+    'text/html',
+    'text/xml',
+)
+
+def normalize_mime(raw):
+    raw = raw.lower()
+    for norm in NORMAL_MIME:
+        if raw.startswith(norm):
+            return norm
+
+    # Special cases
+    if raw.startswith('application/xml'):
+        return 'text/xml'
+    if raw.startswith('application/x-pdf'):
+        return 'application/pdf'
+    return None
+
+
+def test_normalize_mime():
+    assert normalize_mime("asdf") is None
+    assert normalize_mime("application/pdf") == "application/pdf"
+    assert normalize_mime("application/pdf+journal") == "application/pdf"
+    assert normalize_mime("Application/PDF") == "application/pdf"
+    assert normalize_mime("application/p") is None
+    assert normalize_mime("application/xml+stuff") == "text/xml"
+    assert normalize_mime("application/x-pdf") == "application/pdf"
+    assert normalize_mime("application/x-html") is None
+
+def b32_hex(s):
+    s = s.strip().split()[0].lower()
+    if s.startswith("sha1:"):
+        s = s[5:]
+    if len(s) != 32:
+        return s
+    return base64.b16encode(base64.b32decode(s.upper())).lower().decode('utf-8')
+
+
+def parse_cdx_line(raw_cdx):
+
+    cdx = raw_cdx.split()
+    if len(cdx) < 11:
+        return None
+
+    surt = cdx[0]
+    dt = cdx[1]
+    url = cdx[2]
+    mime = normalize_mime(cdx[3])
+    http_status = cdx[4]
+    key = cdx[5]
+    c_size = cdx[8]
+    offset = cdx[9]
+    warc = cdx[10]
+
+    if not (key.isalnum() and c_size.isdigit() and offset.isdigit()
+            and http_status == "200" and len(key) == 32 and dt.isdigit()
+            and mime != None):
+        return None
+
+    if '-' in (surt, dt, url, mime, http_status, key, c_size, offset, warc):
+        return None
+
+    # these are the new/specific bits
+    sha1 = b32_hex(key)
+    return dict(url=url, datetime=dt, sha1hex=sha1, cdx_sha1hex=None, mimetype=mime, warc_path=warc, warc_csize=int(c_size), warc_offset=int(offset))
+
+def insert(cur, batch):
+    sql = """
+        INSERT INTO
+        cdx (url, datetime, sha1hex, mimetype, warc_path, warc_csize, warc_offset)
+        VALUES %s
+        ON CONFLICT ON CONSTRAINT cdx_pkey DO NOTHING
+        RETURNING 1;
+    """
+    batch = [(d['url'], d['datetime'], d['sha1hex'], d['mimetype'],
+              d['warc_path'], d['warc_csize'], d['warc_offset'])
+             for d in batch]
+    res = psycopg2.extras.execute_values(cur, sql, batch) # fetch=True
+    #return len(res)
+
+def stdin_to_pg():
+    # no host means it will use local domain socket by default
+    conn = psycopg2.connect(database="sandcrawler", user="postgres")
+    cur = conn.cursor()
+    counts = collections.Counter({'total': 0})
+    batch = []
+    for l in sys.stdin:
+        l = l.strip()
+        if counts['raw_lines'] > 0 and counts['raw_lines'] % 10000 == 0:
+            print("Progress: {}...".format(counts))
+        counts['raw_lines'] += 1
+        if not l:
+            continue
+        info = parse_cdx_line(l)
+        if not info:
+            continue
+        batch.append(info)
+        counts['total'] += 1
+        if len(batch) >= 1000:
+            insert(cur, batch)
+            conn.commit()
+            #counts['inserted'] += i
+            #counts['existing'] += len(batch) - i
+            batch = []
+            counts['batches'] += 1
+    if batch:
+        insert(cur, batch)
+        #counts['inserted'] += i
+        #counts['existing'] += len(batch) - i
+        batch = []
+    conn.commit()
+    cur.close()
+    print("Done: {}".format(counts))
+
+if __name__=='__main__':
+    stdin_to_pg()