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This extracts the routing package to its own repository
(https://github.com/ipfs/go-ipfs-routing). History has
been preserved. The new module has been gx'ed and published.

Imports have been rewritten and re-ordered accordingly.

An internal dependency to go-ipfs/repo has been removed
by substituting it with the go-datastore.Batching interface.

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

License: MIT
Signed-off-by: Łukasz Magiera <magik6k@gmail.com>

Commits:
namesys: pubsub Publisher and Resolver
namesys/pubsub: pacify code climate.
namesys/pubsub: timeout for rendezvous
namesys/pubsub: filter self in bootstrap connections
namesys/pubsub: Publish to the correct topic

License: MIT
Signed-off-by: vyzo <vyzo@hackzen.org>

namesys/pubsub: unit  test

Commits:
namesys/pubsub: test
namesys/pubsub_test: pacify code climate
namesys/pubsub: update test to use extant mock routing

License: MIT
Signed-off-by: vyzo <vyzo@hackzen.org>

namesys/pubsub: integrate namesys pubsub

namesys: integrate pubsub resolvers
namesys/pubsub_test: tweak delays
- trying to make travis happy.
namesys/pubsub: fix duplicate bootstraps
- subscription key is topic, not ipnskey.
namesys/pubsub: no warning needed on cancellation
namesys/pubsub: warning for receive errors
- and more informative error messages at that.
namesys/pubsub_test: smaller test
- make it work with seemingly low fdlimits in travis/macosx.
  also, more informative test failures.
namesys/pubsub: add delay to let pubsub perform handshake
namesys/pubsub: update gx imports
namesys/pubsub_test: preconnect publisher, reduce delays
- preconnects the publisher to the receivers in order to avoid bootstrap
  flakiness with connectivity problems in travis.
  reduces sleeps to 1s for flood propagation (3s seems excessive with 5 hosts).
namesys/pubsub: drop named return values in resolveOnce
- per review comment.
namesys/pubsub: check errors
namesys/pubsub: store bytes in resolver datastore
namesys/pubsub: resolver Cancel
- for canceling subscriptions, pre whyrusleeping's request.
namesys/pubsub: fix resolution without /ipns prefix
- also improve the logging a bit.
namesys/pubsub: don't resolve own keys through pubsub
namesys/pubsub: signal ErrResolveFailed on resolution failure
namesys/pubsub: use sync datastore, resolver lock only for subs
namesys/pubsub_test: coverage for Cancel

License: MIT
Signed-off-by: vyzo <vyzo@hackzen.org>

namesys/pubsub: parallelize dht and pubsub publishing

Commits:
namesys/pubsub: code cosmetics
namesys: parallelize publishing with dht and pubsub
namesys/pubsub: periodically reprovide topic rendezvous
namesys/pubsub: cancelation for rendezvous goroutine
namesys/pubsub: log ipns record seqno on publish

License: MIT
Signed-off-by: vyzo <vyzo@hackzen.org>

namesys/pubsub: error checking

License: MIT
Signed-off-by: vyzo <vyzo@hackzen.org>

namesys/pubsub: --enable-namesys-pubsub option and management

Commits:
package.json: update go-libp2p-blankhost
namesys: fix stale package imports
update go-testutil
namesys/pubsub: reduce bootstrap provide period to 8hr
namesys/pubsub: try to extract the key from id first
option to enable ipns pubsub: --enable-namesys-pubsub
ipfs name pubsub management subcommands
corehttp/gateway_test: mockNamesys needs to implement GetResolver
pacify code climate

License: MIT
Signed-off-by: vyzo <vyzo@hackzen.org>

namesys/pubsub: pubsub sharness test

test/sharness: test for ipns pubsub
namesys/pubsub: return boolean indicator on Cancel
package.json: remove duplicate entry for go-testutil
update gx deps, testutil to 1.1.12
fix jenkins failure: use tabs in t0183-namesys-pubsub
t0183: use 4 spaces for tabification

License: MIT
Signed-off-by: vyzo <vyzo@hackzen.org>

namesys/pubsub: update for new command interface

License: MIT
Signed-off-by: vyzo <vyzo@hackzen.org>

namesys/pubsub: fix sharness test for broken MacOS echo

echo -n "" should print -n, but hey it's a mac.

License: MIT
Signed-off-by: vyzo <vyzo@hackzen.org>

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

Resolves #4018

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

License: MIT
Signed-off-by: Łukasz Magiera <magik6k@gmail.com>

License: MIT
Signed-off-by: Łukasz Magiera <magik6k@gmail.com>

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

License: MIT
Signed-off-by: Jeromy <why@ipfs.io>

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

Shifting the generic testResolution helper from the protocol-specific
dns_test.go to the generic namesys_test.go.