Github user jpeach commented on a diff in the pull request:
https://github.com/apache/trafficserver/pull/653#discussion_r66907362
--- Diff: iocore/hostdb/I_HostDBProcessor.h ---
@@ -139,10 +141,62 @@ struct SRVInfo {
unsigned int key;
};
-struct HostDBInfo {
+struct HostDBInfo : public RefCountObj {
/** Internal IP address data.
This is at least large enough to hold an IPv6 address.
*/
+
+ int iobuffer_index;
+ static HostDBInfo *
+ alloc(int size = 0)
+ {
+ size += sizeof(HostDBInfo);
+ int iobuffer_index = iobuffer_size_to_index(size);
+ ink_release_assert(iobuffer_index >= 0);
+ void *ptr = ioBufAllocator[iobuffer_index].alloc_void();
+ memset(ptr, 0, size);
+ HostDBInfo *ret = new (ptr) HostDBInfo();
+ ret->iobuffer_index = iobuffer_index;
+ return ret;
+ }
+
+ void
+ free()
+ {
+ ioBufAllocator[iobuffer_index].free_void((void *)(this));
+ }
+
+ // return a version number-- so we can manage compatibility with the
marshal/unmarshal
+ static VersionNumber
+ version()
+ {
+ return VersionNumber(1, 0);
+ }
+
+ static HostDBInfo *
+ unmarshall(char *buf, unsigned int size)
+ {
+ if (size < sizeof(HostDBInfo)) {
+ return NULL;
+ }
+ HostDBInfo *ret = HostDBInfo::alloc(size - sizeof(HostDBInfo));
+ int buf_index = ret->iobuffer_index;
+ memcpy((void *)ret, buf, size);
+ // Reset the refcount back to 0, this is a bit ugly-- but I'm not sure
we want to expose a method
+ // to mess with the refcount, since this is a fairly unique use case
+ ret = new (ret) HostDBInfo();
--- End diff --
You allocated ``sizeof(HostDBInfo)`` less than the given size, then put a
``HostDBInfo`` into it after all? Can you comment what is going on there?
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