decompose get_state query into parallel subqueries

[john-g-g]

Supports

• common state object properties
  • current_route
  • props
  • tag_idx
  • feed_price
  • error
• /@<account>/transfers
• /@<account>/recent-replies
• /@<account>/posts
• /@<account>/comments
• /@<account>/
• /@<account>/blog
• /@<account>/feed
• /@<account>/@<account_name>
• /witnesses or /~witnesses
• /trending
• /payout
• /payout_comments
• /promoted
• /responses
• /hot
• /votes
• /cashout
• /active
• /created
• /recent
• /tags

{
  "current_route": <url>,
  "props": <get_dynamic_global_properties()>              // basic chain properties. a few keys are relevant
  "tag_idx": {
    "trending": <get_trending_tags().map(name)>           // simple array of trending tags used on homepage etc
  },
  "tags": <get_trending_tags()>,                          // only used for tag "explorer" page
  "content": {*url: post_object}                          // posts keyed by author/permlink
  "accounts": {*name: account_object}                     // relevant accounts keyed by name
  "pow_queue": [],                                        // unused/ignore
  "witnesses": <get_witnesses_by_vote()>,                 // only used for /~witnesses
  "discussion_idx": {....},                               // ordered post keys, keyed by (1) current tag (or ""), (2), active sort (e.g. created/trending)
  "witness_schedule": {<get_witness_schedule_object()>}   // unused/ignore
  "feed_price": {<get_current_median_history_price()>}    // referenced from: wallet, market, and signup_bonus(unused?)
  "error": ""
}

[roadscape]

Why are we doing this again? Hive handles most of this and get_state needs to be factored out of condenser ASAP anyway

[roadscape]

To recap chat -

Hive handles the posts/tags part of get_state using native data, allowing us to stop using tags and follows plugins for steemd. I’m guessing the SBDS implementation would be breaking up get_state into constituent subcalls. This is useful for the wallet/transfers case, but we’d need to forward the posts-related calls to hive, which already implements get_state (except the transfers case). Essentially.. hive and sbds/ah have mutually exclusive information which condenser expects merged. This needs to be addressed at the root (condenser) level or at the hive/sbds level.

Since the bulk of it is already implemented in hive, if we can remove ah reliance from get_state in condenser I don’t believe we need to build any more get_state compatibility layers.

Condenser issue tracking: steemit/condenser#2244, steemit/condenser#2684
Hive implementation: https://github.com/steemit/hivemind/blob/master/hive/server/condenser_api.py