COPY with ranges

[John Dickinson]

send 1 or more ranges with a copy request that copies just those ranges of the source to the destination

[Tim Burke (1-tim-z)]

This already works for one range, right?

    $ curl -sv -H x-auth-token:$OS_AUTH_TOKEN $OS_STORAGE_URL/c/1range -X PUT -H x-copy-from:c/tox.ini -H range:bytes=0-10 -H content-length:0
    * Trying 192.168.8.80...
    * Connected to saio (192.168.8.80) port 8080 (#0)
    > PUT /v1/AUTH_test/c/1range HTTP/1.1
    > Host: saio:8080
    > User-Agent: curl/7.43.0
    > Accept: */*
    > x-auth-token:AUTH_tk21005e35147741cca1ac947e27172b69
    > x-copy-from:c/tox.ini
    > range:bytes=0-10
    > content-length:0
    >
    < HTTP/1.1 201 Created
    < Content-Length: 0
    < X-Object-Meta-Mtime: 1446154503.000000
    < X-Copied-From-Last-Modified: Tue, 22 Dec 2015 21:51:12 GMT
    < X-Copied-From: c/tox.ini
    < Last-Modified: Tue, 22 Dec 2015 21:54:00 GMT
    < Etag: f935b2c50837722c7a93aa48577ca146
    < X-Copied-From-Account: AUTH_test
    < Content-Type: text/html; charset=UTF-8
    < X-Trans-Id: tx16fd8a9ed5c4425381ddd-005679c677
    < Date: Tue, 22 Dec 2015 21:53:59 GMT
    <
    * Connection #0 to host saio left intact

    $ curl -sv -H x-auth-token:$OS_AUTH_TOKEN $OS_STORAGE_URL/c/1range
    * Trying 192.168.8.80...
    * Connected to saio (192.168.8.80) port 8080 (#0)
    > GET /v1/AUTH_test/c/1range HTTP/1.1
    > Host: saio:8080
    > User-Agent: curl/7.43.0
    > Accept: */*
    > x-auth-token:AUTH_tk21005e35147741cca1ac947e27172b69
    >
    < HTTP/1.1 200 OK
    < Content-Length: 11
    < X-Object-Meta-Mtime: 1446154503.000000
    < Last-Modified: Tue, 22 Dec 2015 21:54:00 GMT
    < Connection: close
    < Etag: f935b2c50837722c7a93aa48577ca146
    < X-Timestamp: 1450821239.57875
    < Date: Tue, 22 Dec 2015 21:54:11 GMT
    < Content-Type: application/octet-stream
    < X-Trans-Id: txaecde39127ee4800bb861-005679c683
    <
    [tox]
    * Closing connection 0
    minve

It kind of works for multiple ranges, too, but not in the way that a user might expect: the raw multipart MIME document gets written as the new object, with subsequent GETs responding 200 (rather than 206).

    $ curl -sv -H x-auth-token:$OS_AUTH_TOKEN $OS_STORAGE_URL/c/2ranges -X PUT -H x-copy-from:c/tox.ini -H range:bytes=0-10,5-10 -H content-length:0
    * Trying 192.168.8.80...
    * Connected to saio (192.168.8.80) port 8080 (#0)
    > PUT /v1/AUTH_test/c/2ranges HTTP/1.1
    > Host: saio:8080
    > User-Agent: curl/7.43.0
    > Accept: */*
    > x-auth-token:AUTH_tk21005e35147741cca1ac947e27172b69
    > x-copy-from:c/tox.ini
    > range:bytes=0-10,5-10
    > content-length:0
    >
    < HTTP/1.1 201 Created
    < Content-Length: 0
    < X-Object-Meta-Mtime: 1446154503.000000
    < X-Copied-From-Last-Modified: Tue, 22 Dec 2015 21:51:12 GMT
    < X-Copied-From: c/tox.ini
    < Last-Modified: Tue, 22 Dec 2015 21:54:41 GMT
    < Etag: 5d0c4072b5cfd909bf121e524106a6fb
    < X-Copied-From-Account: AUTH_test
    < Content-Type: text/html; charset=UTF-8
    < X-Trans-Id: tx12f9178a03134900b6d26-005679c6a0
    < Date: Tue, 22 Dec 2015 21:54:40 GMT
    <
    * Connection #0 to host saio left intact

    $ curl -sv -H x-auth-token:$OS_AUTH_TOKEN $OS_STORAGE_URL/c/2ranges
    * Trying 192.168.8.80...
    * Connected to saio (192.168.8.80) port 8080 (#0)
    > GET ...

[John Dickinson (notmyname)]

Right. The "wishlist" thing here is that I can grab a few different ranges and create a new object out of them.

Thoughts (in no real order):

 * Maybe this is a breaking change since the old-style multipart mime wouldn't be what's copied.
 * Maybe now that we have SLORanges, thats' the Way It Is To Be Done now. This would involve a second "squash" step if needed by the user.

If those are true (and I suspect they are), then this older wishlist thing could probably be closed with a "don't do it that way, here use this instead".

[John Dickinson (notmyname)]

linking to https://bugs.launchpad.net/swift/+bug/1467668 since it's a similar report (although not really a duplicate)