Add Uniswap price integration

[santteegt]

Description

• The management command get_prices now fetch all ETH=>token and token=>USD prices from the Uniswap exchange by querying the Uniswap subgraph on mainnet

Refers/Fixes

Refs: #6192

[codecov]

Codecov Report

Merging #6231 into master will increase coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #6231      +/-   ##
==========================================
+ Coverage   27.08%   27.10%   +0.02%     
==========================================
  Files         290      290              
  Lines       26628    26626       -2     
  Branches     3942     3941       -1     
==========================================
+ Hits         7212     7218       +6     
+ Misses      19145    19141       -4     
+ Partials      271      267       -4     

Impacted Files	Coverage Δ
app/economy/management/commands/get_prices.py	0.00% <0.00%> (ø)
app/dashboard/views.py	11.24% <0.00%> (ø)
...rketing/management/commands/no_applicants_email.py	0.00% <0.00%> (ø)
...eting/management/commands/assemble_leaderboards.py	40.48% <0.00%> (ø)
app/dashboard/embed.py	31.60% <0.00%> (+3.44%)	⬆️

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[owocki]

@santteegt just tried this and it works (mostly) like a charm!

a few testing notes:

1. can we get all trading pairs, not just top 50?
2. i get a value too long for type character varying(30) when i change the query_limit to 200. looks like something called REALTOKEN-16200-FULLERTON-AVE-DETROIT-MI breaks it. perhaps worth wrappin geach iteration of the for loop in a try catch?

[santteegt]

Hi @owocki,

Just updated my PR so it now retrieves all exchange pairs from Uniswap. Exceptions due to long token names and zero value exchanges are also handled properly. Thanks @niran for pointing that the issue has already been solved

[danlipert]

@santteegt I see theres a conflict here - is this PR now out of date given the recent changes?

[santteegt]

Hi @danlipert,

Looks like @owocki has cherrypicked my commit, made a small change to fetch prices only for the Panvala token, and pushed this (commit) to master

I've rebased my PR excluding this change. In case it is required let me know to put it back again

[danlipert]

@owocki thoughts on this? I dont know if we want to limit the scope to Panvala or if we are good to source all the coins since this PR undoes the changes you did

[owocki]

last time we did all coins from uniswap it messed up price feeds across the site (some stable coins have low liquidity and were valued at 10x what they should have been). would prefer to keep the scope limited to just PAN for now. but maybe make it easy to add new uniswap tokens at a future date if people keep adding those coins.

[santteegt]

Changes to my PR has now been restored. Now, my PR is basically doing nothing but worth mentioning that the initial implementation was already merged into master before approving this PR 😄

[thelostone-mc]

@santteegt lol I'll be closing this one out cause like you said , your commit is already in :)
Thanks :D