Prevent output from being flushed to the console too frequently in dir_get_metadata().

svn path=/main/trunk/; revision=7672

diff --git a/pym/portage/getbinpkg.py b/pym/portage/getbinpkg.py
index e39b365024481fcd59c2a0b9bc6b0ab74e688d4b..752a0fb4ccd48a84c951004dffdb474d8c3ffe82 100644 (file)
--- a/pym/portage/getbinpkg.py
+++ b/pym/portage/getbinpkg.py
@@ -548,18 +548,37 @@ def dir_get_metadata(baseurl, conn=None, chunk_size=3000, verbose=1, usingcache=
                                sys.stderr.flush()
                        break
        # We may have metadata... now we run through the tbz2 list and check.
-       ext_miss = 0
-       ext_hit = 0
-       out.write(yellow("cache miss: '"+str(ext_miss)+"'")+" --- "+green("cache hit: '"+str(ext_hit)+"'"))
-       out.flush()
+
+       class CacheStats(object):
+               from time import time
+               def __init__(self, out):
+                       self.misses = 0
+                       self.hits = 0
+                       self.last_update = 0
+                       self.out = out
+                       self.min_display_latency = 0.2
+               def update(self):
+                       cur_time = self.time()
+                       if cur_time - self.last_update >= self.min_display_latency:
+                               self.last_update = cur_time
+                               self.display()
+               def display(self):
+                       self.out.write("\r"+yellow("cache miss: '"+str(self.misses)+"'")+\
+                               " --- "+green("cache hit: '"+str(self.hits)+"'"))
+                       self.out.flush()
+
+       cache_stats = CacheStats(out)
+       have_tty = out.isatty()
+       if have_tty:
+               cache_stats.display()
        binpkg_filenames = set()
        for x in tbz2list:
                x = os.path.basename(x)
                binpkg_filenames.add(x)
                if x not in metadata[baseurl]["data"]:
-                       ext_miss += 1
-                       out.write("\r"+yellow("cache miss: '"+str(ext_miss)+"'")+" --- "+green("cache hit: '"+str(ext_hit)+"'"))
-                       out.flush()
+                       cache_stats.misses += 1
+                       if have_tty:
+                               cache_stats.update()
                        metadata[baseurl]["modified"] = 1
                        myid = None
                        for retry in xrange(3):
@@ -582,9 +601,10 @@ def dir_get_metadata(baseurl, conn=None, chunk_size=3000, verbose=1, usingcache=
                                sys.stderr.write(red("!!! Failed to retrieve metadata on: ")+str(x)+"\n")
                                sys.stderr.flush()
                else:
-                       ext_hit += 1
-                       out.write("\r"+yellow("cache miss: '"+str(ext_miss)+"'")+" --- "+green("cache hit: '"+str(ext_hit)+"'"))
-                       out.flush()
+                       cache_stats.hits += 1
+                       if have_tty:
+                               cache_stats.update()
+       cache_stats.display()
        # Cleanse stale cache for files that don't exist on the server anymore.
        stale_cache = set(metadata[baseurl]["data"]).difference(binpkg_filenames)
        if stale_cache: