Add fetch: block, spend, block-height, block-hashes, stealth-hashes, merkle

[evoskuil]

The server fetch-spend method is not getting tested, and is the only use of the huge spends store.

[thecodefactory]

Fetch-block was completed in #600

I am looking at some of the others and so far have:

$ bx fetch-block-height 000000000003ba27aa200b1cecaad478d2b00432346c3f1f3986da1afd33e506
100000

$ bx fetch-block-hashes -s 000000000003ba27aa200b1cecaad478d2b00432346c3f1f3986da1afd33e506
hashes
{
    transaction_hash
    {
        hash 8c14f0db3df150123e6f3dbbf30f8b955a8249b62ac1d1ff16284aefa3d06d87
    }
    transaction_hash
    {
        hash fff2525b8931402dd09222c50775608f75787bd2b87e56995a7bdd30f79702c4
    }
    transaction_hash
    {
        hash 6359f0868171b1d194cbee1af2f16ea598ae8fad666d9b012c8ed2b79a236ec4
    }
    transaction_hash
    {
        hash e9a66845e05d5abc0ad04ec80f774a7e585c6e8db975962d069a522137b80c1d
    }
}

@evoskuil The output of the last command seems somehow not satisfying, or optimal. Any suggestions on improvement?

[evoskuil]

This should be a JSON array of hashes.

[thecodefactory]

This should be a JSON array of hashes.

Something like this? Already seems better to me ...

hashes
{
    transaction_hash 8c14f0db3df150123e6f3dbbf30f8b955a8249b62ac1d1ff16284aefa3d06d87
    transaction_hash fff2525b8931402dd09222c50775608f75787bd2b87e56995a7bdd30f79702c4
    transaction_hash 6359f0868171b1d194cbee1af2f16ea598ae8fad666d9b012c8ed2b79a236ec4
    transaction_hash e9a66845e05d5abc0ad04ec80f774a7e585c6e8db975962d069a522137b80c1d
}

EDIT: Actually, should probably invert (hashes for transaction_hashes, then replace transaction_hash with just hash)

[evoskuil]

Yeah, maybe just “hash” for the elements.

[evoskuil]

The array notation should be [] and without names I believe.

[evoskuil]

@thecodefactory can we close this?