contrib/linearize: Add feature to set file's timestamp based on block header time.

contrib/linearize/README.md

@@ -27,6 +27,7 @@ output.
 Optional config file setting for linearize-data:
 * "netmagic": network magic number
 * "max_out_sz": maximum output file size (default 1000*1000*1000)
-* "split_year": Split files when a new year is first seen, in addition to
+* "split_timestamp": Split files when a new month is first seen, in addition to
 reaching a maximum file size.
-
+* "file_timestamp": Set each file's last-modified time to that of the
+most recent block in that file.

contrib/linearize/linearize-data.py

@@ -10,11 +10,13 @@
 import json
 import struct
 import re
+import os
 import base64
 import httplib
 import sys
 import hashlib
 import datetime
+import time
 
 settings = {}
 
@@ -60,9 +62,10 @@ def calc_hash_str(blk_hdr):
 
 def get_blk_dt(blk_hdr):
 	members = struct.unpack("<I", blk_hdr[68:68+4])
-	dt = datetime.datetime.fromtimestamp(members[0])
+	nTime = members[0]
+	dt = datetime.datetime.fromtimestamp(nTime)
 	dt_ym = datetime.datetime(dt.year, dt.month, 1)
-	return dt_ym
+	return (dt_ym, nTime)
 
 def get_block_hashes(settings):
 	blkindex = []
@@ -87,14 +90,19 @@ def copydata(settings, blkindex, blkset):
 	outFn = 0
 	outsz = 0
 	outF = None
+	outFname = None
 	blkCount = 0
 
 	lastDate = datetime.datetime(2000, 1, 1)
+	highTS = 1408893517 - 315360000
 	timestampSplit = False
 	fileOutput = True
+	setFileTime = False
 	maxOutSz = settings['max_out_sz']
 	if 'output' in settings:
 		fileOutput = False
+	if settings['file_timestamp'] != 0:
+		setFileTime = True
 	if settings['split_timestamp'] != 0:
 		timestampSplit = True
 
@@ -134,34 +142,41 @@ def copydata(settings, blkindex, blkset):
 
 		if not fileOutput and ((outsz + inLen) > maxOutSz):
 			outF.close()
+			if setFileTime:
+				os.utime(outFname, (int(time.time()), highTS))
 			outF = None
+			outFname = None
 			outFn = outFn + 1
 			outsz = 0
 
-		if timestampSplit:
-			blkDate = get_blk_dt(blk_hdr)
-			if blkDate > lastDate:
+		(blkDate, blkTS) = get_blk_dt(blk_hdr)
+		if timestampSplit and (blkDate > lastDate):
 			print("New month " + blkDate.strftime("%Y-%m") + " @ " + hash_str)
 			lastDate = blkDate
 			if outF:
 				outF.close()
+				if setFileTime:
+					os.utime(outFname, (int(time.time()), highTS))
 				outF = None
+				outFname = None
 				outFn = outFn + 1
 				outsz = 0
 
 		if not outF:
 			if fileOutput:
-				fname = settings['output_file']
+				outFname = settings['output_file']
 			else:
-				fname = "%s/blk%05d.dat" % (settings['output'], outFn)
-			print("Output file" + fname)
-			outF = open(fname, "wb")
+				outFname = "%s/blk%05d.dat" % (settings['output'], outFn)
+			print("Output file" + outFname)
+			outF = open(outFname, "wb")
 
 		outF.write(inhdr)
 		outF.write(rawblock)
 		outsz = outsz + inLen + 8
 
 		blkCount = blkCount + 1
+		if blkTS > highTS:
+			highTS = blkTS
 
 		if (blkCount % 1000) == 0:
 			print("Wrote " + str(blkCount) + " blocks")
@@ -191,6 +206,8 @@ if __name__ == '__main__':
 		settings['input'] = 'input'
 	if 'hashlist' not in settings:
 		settings['hashlist'] = 'hashlist.txt'
+	if 'file_timestamp' not in settings:
+		settings['file_timestamp'] = 0
 	if 'split_timestamp' not in settings:
 		settings['split_timestamp'] = 0
 	if 'max_out_sz' not in settings:
@@ -198,6 +215,7 @@ if __name__ == '__main__':
 
 	settings['max_out_sz'] = long(settings['max_out_sz'])
 	settings['split_timestamp'] = int(settings['split_timestamp'])
+	settings['file_timestamp'] = int(settings['file_timestamp'])
 	settings['netmagic'] = settings['netmagic'].decode('hex')
 
 	if 'output_file' not in settings and 'output' not in settings: