* merged http download limit for apt (#146877)

5 files changed, 53 insertions, 5 deletions

diff --git a/apt-pkg/acquire.cc b/apt-pkg/acquire.cc
index 62209e65b..57cf60bfe 100644
--- a/apt-pkg/acquire.cc
+++ b/apt-pkg/acquire.cc
@@ -266,7 +266,11 @@ pkgAcquire::MethodConfig *pkgAcquire::GetConfig(string Access)
    Worker Work(Conf);
    if (Work.Start() == false)
       return 0;
-   
+
+   /* if a method uses DownloadLimit, we switch to SingleInstance mode */
+   if(_config->FindI("Acquire::"+Access+"::DlLimit",0) > 0)
+      Conf->SingleInstance = true;
+    
    return Conf;
 }
 									/*}}}*/
diff --git a/debian/changelog b/debian/changelog
index 2022448a0..34f8cec03 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,4 +1,4 @@
-apt (0.6.42.4) unstable; urgency=low
+apt (0.6.43) unstable; urgency=low
 
   * Merge bubulle@debian.org--2005/apt--main--0 up to patch-132:  
     * zh_CN.po: Completed to 510 strings(Closes: #338267)
@@ -9,8 +9,9 @@ apt (0.6.42.4) unstable; urgency=low
   * fix bug in pkgCache::VerIterator::end() (thanks to Daniel Burrows)
     (closes: #339533)
   * pkgAcqFile is more flexible now (closes: #57091)
+  * support a download rate limit for http (closes: #146877)
   
- -- 
+ --
 
 apt (0.6.42.3) unstable; urgency=low
 
diff --git a/doc/examples/configure-index b/doc/examples/configure-index
index a93b74349..9e851d753 100644
--- a/doc/examples/configure-index
+++ b/doc/examples/configure-index
@@ -117,6 +117,7 @@ Acquire
     No-Cache "false";
     Max-Age "86400";     // 1 Day age on index files
     No-Store "false";    // Prevent the cache from storing archives    
+    Dl-Limit "7";        // 7Kb/sec maximum download rate
   };
 
   ftp
diff --git a/methods/http.cc b/methods/http.cc
index ba86aa6b6..a5c9601e7 100644
--- a/methods/http.cc
+++ b/methods/http.cc
@@ -58,6 +58,12 @@ unsigned long PipelineDepth = 10;
 unsigned long TimeOut = 120;
 bool Debug = false;
 
+
+unsigned long CircleBuf::BwReadLimit=0;
+unsigned long CircleBuf::BwTickReadData=0;
+struct timeval CircleBuf::BwReadTick={0,0};
+const unsigned int CircleBuf::BW_HZ=10;
+  
 // CircleBuf::CircleBuf - Circular input buffer				/*{{{*/
 // ---------------------------------------------------------------------
 /* */
@@ -65,6 +71,8 @@ CircleBuf::CircleBuf(unsigned long Size) : Size(Size), Hash(0)
 {
    Buf = new unsigned char[Size];
    Reset();
+
+   CircleBuf::BwReadLimit = _config->FindI("Acquire::http::Dl-Limit",0)*1024;
 }
 									/*}}}*/
 // CircleBuf::Reset - Reset to the default state			/*{{{*/
@@ -90,16 +98,45 @@ void CircleBuf::Reset()
    is non-blocking.. */
 bool CircleBuf::Read(int Fd)
 {
+   unsigned long BwReadMax;
+
    while (1)
    {
       // Woops, buffer is full
       if (InP - OutP == Size)
 	 return true;
-      
+
+      // what's left to read in this tick
+      BwReadMax = CircleBuf::BwReadLimit/BW_HZ;
+
+      if(CircleBuf::BwReadLimit) {
+	 struct timeval now;
+	 gettimeofday(&now,0);
+
+	 unsigned long d = (now.tv_sec-CircleBuf::BwReadTick.tv_sec)*1000000 +
+	    now.tv_usec-CircleBuf::BwReadTick.tv_usec;
+	 if(d > 1000000/BW_HZ) {
+	    CircleBuf::BwReadTick = now;
+	    CircleBuf::BwTickReadData = 0;
+	 } 
+	 
+	 if(CircleBuf::BwTickReadData >= BwReadMax) {
+	    usleep(1000000/BW_HZ);
+	    return true;
+	 }
+      }
+
       // Write the buffer segment
       int Res;
-      Res = read(Fd,Buf + (InP%Size),LeftRead());
+      if(CircleBuf::BwReadLimit) {
+	 Res = read(Fd,Buf + (InP%Size), 
+		    BwReadMax > LeftRead() ? LeftRead() : BwReadMax);
+      } else
+	 Res = read(Fd,Buf + (InP%Size),LeftRead());
       
+      if(Res > 0 && BwReadLimit > 0) 
+	 CircleBuf::BwTickReadData += Res;
+    
       if (Res == 0)
 	 return false;
       if (Res < 0)
diff --git a/methods/http.h b/methods/http.h
index c5a4d0e86..541e2952c 100644
--- a/methods/http.h
+++ b/methods/http.h
@@ -31,6 +31,11 @@ class CircleBuf
    unsigned long MaxGet;
    struct timeval Start;
    
+   static unsigned long BwReadLimit;
+   static unsigned long BwTickReadData;
+   static struct timeval BwReadTick;
+   static const unsigned int BW_HZ;
+
    unsigned long LeftRead()
    {
       unsigned long Sz = Size - (InP - OutP);