Re: [quicwg/base-drafts] [qpack] Overhaul the pseudocode (#3577)
Martin Thomson <notifications@github.com> Tue, 14 April 2020 01:32 UTC
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Date: Mon, 13 Apr 2020 18:32:44 -0700
From: Martin Thomson <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] [qpack] Overhaul the pseudocode (#3577)
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@martinthomson commented on this pull request. I couldn't see any problems, but I have some suggestions. Thanks for doing the cleanup. > for header in headers: - staticIdx = staticTable.getIndex(header) - if staticIdx: - encodeIndexReference(streamBuffer, staticIdx) + staticIndex = staticTable.getIndex(header) ```suggestion staticIndex = staticTable.findIndex(header) ``` This is a search, right? > continue - dynamicIdx = dynamicTable.getIndex(header) - if !dynamicIdx: + dynamicIndex = dynamicTable.getIndex(header) ```suggestion dynamicIndex = dynamicTable.findIndex(header) ``` > # No matching entry. Either insert+index or encode literal - nameIdx = getNameIndex(header) + + # getNameIndex attempts to find an index for this header's name. + # If one exists, it returns the name's (absolute) index and a + # boolean indicating which table has the name. If the name + # can't be found, nameIndex is None + nameIndex, isStaticName = getNameIndex(header.name) This is a little strange, as you are relying on functions on the tables to find the full entry, but you jump to a different approach for looking up the name. I realize that two lookups are worse than one, but it's an odd stylistic jump, that's all. ```python # An alternative might be to do the name lookup like this: staticNameIndex = staticTable.findName(header.name) if staticNameIndex is None: dynamicNameIndex = dynamicTable.findName(header.name) if header.canIndex() and dynamicTable.canAdd(header): encodeInsert(encoderBuffer, staticNameIndex, dynamicNameIndex, header) dynamicIndex = dynamicTable.add(header) # For a bonus, continuing from the above, forget about the # newly inserted dynamic table entry if we are at the limit of blocked streams. if numBlockedStreams >= maxBlockedStreams: dynamicIndex = None else: addedBlockingEntry = True # Later, you can increase numBlockedStreams, but you only do that once. ``` > dynamicTable.add(header) - dynamicIdx = dynamicTable.baseIndex + dynamicIndex = dynamicTable.getInsertCount() I can't suggest here, but I think that you just want this: ```python dynamicIndex = dynamicTable.add(header) ``` Otherwise you are breaking encapsulation in a small way: relying on the insert count for getting the index of the thing you just added. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/quicwg/base-drafts/pull/3577#pullrequestreview-392540915
- [quicwg/base-drafts] [qpack] Overhaul the pseudoc… afrind
- Re: [quicwg/base-drafts] [qpack] Overhaul the pse… Martin Thomson
- Re: [quicwg/base-drafts] [qpack] Overhaul the pse… Kazu Yamamoto
- Re: [quicwg/base-drafts] [qpack] Overhaul the pse… Mike Bishop
- Re: [quicwg/base-drafts] [qpack] Overhaul the pse… afrind
- Re: [quicwg/base-drafts] [qpack] Overhaul the pse… afrind