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wireproto: add media type to version 2 capabilities response...
wireproto: add media type to version 2 capabilities response This is useful to advertise because servers reject unsupported media types. A client may wish to speak multiple media types and choose the one the server supports. I doubt we'll ever use multiple media types or negotiation in core. But during the course of developing this protocol, I may end up making extensions that backport and forward port protocol support as needed to support Mercurial deploys in the wild. e.g. I may deploy support for an older protocol on a server so old clients can continue using it. It's worth pursuing changing the SSH protocol's upgrade mechanism to support multiple media types as well... Differential Revision: https://phab.mercurial-scm.org/D3299
Gregory Szorc - - Load All Authors

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test-wireproto-command-heads.t
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Gregory Szorc
wireproto: port heads command to wire protocol v2...
 r37503 $ . $TESTDIR/wireprotohelpers.sh
$ hg init server
$ enablehttpv2 server
$ cd server
$ hg debugdrawdag << EOF
> H I J
> | | |
> E F G
> | |/
> C D
> |/
> B
> |
> A
> EOF
$ hg phase --force --secret J
$ hg phase --public E
$ hg log -r 'E + H + I + G + J' -T '{rev}:{node} {desc} {phase}\n'
4:78d2dca436b2f5b188ac267e29b81e07266d38fc E public
7:ae492e36b0c8339ffaf328d00b85b4525de1165e H draft
8:1d6f6b91d44aaba6d5e580bc30a9948530dbe00b I draft
6:29446d2dc5419c5f97447a8bc062e4cc328bf241 G draft
9:dec04b246d7cbb670c6689806c05ad17c835284e J secret
$ hg serve -p $HGPORT -d --pid-file hg.pid -E error.log
$ cat hg.pid > $DAEMON_PIDS
All non-secret heads returned by default
$ sendhttpv2peer << EOF
> command heads
> EOF
creating http peer for wire protocol version 2
Gregory Szorc
debugcommands: perform handshake when obtaining httpv2 peer...
 r37663 s> GET /?cmd=capabilities HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> vary: X-HgProto-1,X-HgUpgrade-1\r\n
s> x-hgproto-1: cbor\r\n
s> x-hgupgrade-1: exp-http-v2-0001\r\n
s> accept: application/mercurial-0.1\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> user-agent: Mercurial debugwireproto\r\n
s> \r\n
s> makefile('rb', None)
s> HTTP/1.1 200 OK\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-cbor\r\n
s> Content-Length: *\r\n (glob)
s> \r\n
Gregory Szorc
wireproto: add media type to version 2 capabilities response...
 r37671 s> \xa3Dapis\xa1Pexp-http-v2-0001\xa3Hcommands\xa7Eheads\xa2Dargs\xa1Jpubliconly\xf4Kpermissions\x81DpullEknown\xa2Dargs\xa1Enodes\x81HdeadbeefKpermissions\x81DpullFlookup\xa2Dargs\xa1CkeyCfooKpermissions\x81DpullGpushkey\xa2Dargs\xa4CkeyCkeyCnewCnewColdColdInamespaceBnsKpermissions\x81DpushHlistkeys\xa2Dargs\xa1InamespaceBnsKpermissions\x81DpullIbranchmap\xa2Dargs\xa0Kpermissions\x81DpullLcapabilities\xa2Dargs\xa0Kpermissions\x81DpullKcompression\x82\xa1DnameDzstd\xa1DnameDzlibQframingmediatypes\x81X&application/mercurial-exp-framing-0003GapibaseDapi/Nv1capabilitiesY\x01\xa9batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
Gregory Szorc
wireproto: port heads command to wire protocol v2...
 r37503 sending heads command
s> POST /api/exp-http-v2-0001/ro/heads HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> accept: application/mercurial-exp-framing-0003\r\n
s> content-type: application/mercurial-exp-framing-0003\r\n
s> content-length: 20\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> user-agent: Mercurial debugwireproto\r\n
s> \r\n
s> \x0c\x00\x00\x01\x00\x01\x01\x11\xa1DnameEheads
s> makefile('rb', None)
s> HTTP/1.1 200 OK\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-exp-framing-0003\r\n
s> Transfer-Encoding: chunked\r\n
s> \r\n
s> 48\r\n
s> @\x00\x00\x01\x00\x02\x01F
s> \x83T\x1dok\x91\xd4J\xab\xa6\xd5\xe5\x80\xbc0\xa9\x94\x850\xdb\xe0\x0bT\xaeI.6\xb0\xc83\x9f\xfa\xf3(\xd0\x0b\x85\xb4R]\xe1\x16^T)Dm-\xc5A\x9c_\x97Dz\x8b\xc0b\xe4\xcc2\x8b\xf2A
s> \r\n
received frame(size=64; request=1; stream=2; streamflags=stream-begin; type=bytes-response; flags=eos|cbor)
s> 0\r\n
s> \r\n
response: [[b'\x1dok\x91\xd4J\xab\xa6\xd5\xe5\x80\xbc0\xa9\x94\x850\xdb\xe0\x0b', b'\xaeI.6\xb0\xc83\x9f\xfa\xf3(\xd0\x0b\x85\xb4R]\xe1\x16^', b')Dm-\xc5A\x9c_\x97Dz\x8b\xc0b\xe4\xcc2\x8b\xf2A']]
Requesting just the public heads works
$ sendhttpv2peer << EOF
> command heads
> publiconly 1
> EOF
creating http peer for wire protocol version 2
Gregory Szorc
debugcommands: perform handshake when obtaining httpv2 peer...
 r37663 s> GET /?cmd=capabilities HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> vary: X-HgProto-1,X-HgUpgrade-1\r\n
s> x-hgproto-1: cbor\r\n
s> x-hgupgrade-1: exp-http-v2-0001\r\n
s> accept: application/mercurial-0.1\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> user-agent: Mercurial debugwireproto\r\n
s> \r\n
s> makefile('rb', None)
s> HTTP/1.1 200 OK\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-cbor\r\n
s> Content-Length: *\r\n (glob)
s> \r\n
Gregory Szorc
wireproto: add media type to version 2 capabilities response...
 r37671 s> \xa3Dapis\xa1Pexp-http-v2-0001\xa3Hcommands\xa7Eheads\xa2Dargs\xa1Jpubliconly\xf4Kpermissions\x81DpullEknown\xa2Dargs\xa1Enodes\x81HdeadbeefKpermissions\x81DpullFlookup\xa2Dargs\xa1CkeyCfooKpermissions\x81DpullGpushkey\xa2Dargs\xa4CkeyCkeyCnewCnewColdColdInamespaceBnsKpermissions\x81DpushHlistkeys\xa2Dargs\xa1InamespaceBnsKpermissions\x81DpullIbranchmap\xa2Dargs\xa0Kpermissions\x81DpullLcapabilities\xa2Dargs\xa0Kpermissions\x81DpullKcompression\x82\xa1DnameDzstd\xa1DnameDzlibQframingmediatypes\x81X&application/mercurial-exp-framing-0003GapibaseDapi/Nv1capabilitiesY\x01\xa9batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
Gregory Szorc
wireproto: port heads command to wire protocol v2...
 r37503 sending heads command
s> POST /api/exp-http-v2-0001/ro/heads HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> accept: application/mercurial-exp-framing-0003\r\n
s> content-type: application/mercurial-exp-framing-0003\r\n
s> content-length: 39\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> user-agent: Mercurial debugwireproto\r\n
s> \r\n
s> \x1f\x00\x00\x01\x00\x01\x01\x11\xa2Dargs\xa1JpubliconlyA1DnameEheads
s> makefile('rb', None)
s> HTTP/1.1 200 OK\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-exp-framing-0003\r\n
s> Transfer-Encoding: chunked\r\n
s> \r\n
s> 1e\r\n
s> \x16\x00\x00\x01\x00\x02\x01F
s> \x81Tx\xd2\xdc\xa46\xb2\xf5\xb1\x88\xac&~)\xb8\x1e\x07&m8\xfc
s> \r\n
received frame(size=22; request=1; stream=2; streamflags=stream-begin; type=bytes-response; flags=eos|cbor)
s> 0\r\n
s> \r\n
response: [[b'x\xd2\xdc\xa46\xb2\xf5\xb1\x88\xac&~)\xb8\x1e\x07&m8\xfc']]
$ cat error.log