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License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

bitswap keeps the threadsafe version. observing the ledger shows that it
doesn't need it anymore (ledgermanager is protected and safe).

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

If we put the lock next to the fields it protects, it can sometimes make
it easier to reason about threadsafety.

In this case, it reveals that the task queue (not threadsafe) isn't protected by the
mutex, yet shared between the worker and callers.

@whyrusleeping

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

it's only used in two places, but i think we've been using maps on IPFS
types so much now that the specificity is no longer necessary

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

Before, priority carried two pieces of information.

One: priority as defined by remote peer
Two: whether task is trashed

This assumes the protocol is defined for natural numbers instead of
integers. That may not always be the case. Better to leave that
assumption outside so this package isn't coupled to the whims of the
protocol.

The protocol may be changed to allow any integer value to be used.
Hopefully by that time, new responsibilties weren't added to the
Priority variable.

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

it seems to make sense since, in each place, the Key and Priority
represent the same information

b/c you know the saying...

"It is better to have 100 functions operate on one data structure than
10 functions on 10 data structures."

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

we've been using maps with peers long enough now that this probably is
no longer necessary

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

the less bitswap has to know about, the easier it'll be for readers.
(This now returns Messages.)

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

for clarity and to avoid errors, define a function

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

(merely by convention)

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

function should be a no-op when passed an empty slice

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

notice that moving the blockstore fetch into the manager removes the
weird error handling case.

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

good to const until it's required for them to be variable.

TODO pass them in as configuration options

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

performing CR in the form of a PR. Let me know what you think.

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>