require 'ib-api' require 'ib/verify'in your scripts.
Contract#verify
To ease the process of verification of given contract-attributes, a handy verify method is provided.
w = IB::Symbols::Stocks.wfc
w.con_id => 0
ww = w.verify.first
ww.con_id => 10375
ww.contract_detail.long_name => "WELLS FARGO & CO"
In its basic form
IB::Contract.verify just sends a :RequestContractData-Message, fetches the response and extracts IB::Contracts.
Contract#verify queries the TWS for a valid contract and returns the response as new object.Manipulations of the response
Contract#verify accepts a block to to manipulate the returned contract. The block has access to any returned
IB::Contract-object.
f = Future.new symbol: 'DAX', expiry: 2021, exchange: 'DTB', currency: 'EUR', multiplier: 5
dax_con_ids = f.verify{|c| {c.expiry => c.con_id }}
=> [{"20201218"=>413140771}, {"20210319"=>428741696}, {"20210618"=>446220391}]
or – if you want to store the returned contracts
f = Future.new symbol: 'DAX', expiry: 2021, exchange: 'DTB', currency: 'EUR', multiplier: 5
dax_contracts = f.verify{|c| c.essential.to_yaml }
pp.dax_contracts.last
"--- !ruby/object:IB::Future\n" +
"attributes:\n" +
" :symbol: DAX\n" +
" :con_id: 446220391\n" +
" :exchange: DTB\n" +
" :right: ''\n" +
" :currency: EUR\n" +
" :expiry: '20210618'\n" +
" :strike: 0.0\n" +
" :local_symbol: FDXM JUN 21\n" +
" :last_trading_day: '2021-06-18'\n" +
" :multiplier: 5\n" +
" :trading_class: FDXM\n" +
" :sec_type: FUT\n" +
" :created_at: 2020-10-27 07:41:52.297145470 +00:00\n" +
" :include_expired: false\n" +
"description: DAX 30 Index (Deutsche Aktien Xchange 30)\n"
Asynchronous Verification
If a bunch of IB::Contracts should be verified, verify can be called for each.
The entries are processed sequentially, which is slow.
Contract.verify( thread: true ) just submits requests. It returns the receiver-thread and performs the
query asynchron.
Assuming, a watchlist was setup. (You can do this by running ruby input.rb in the examples
directory of ib-extensions), then
Symbols.allocate_collection :W500
puts Symbols::W500.all.size => 456
To verify all IB::Contracts asynchronous, collect any thread into an array and join it.
verified_symbols = []
Symbols::W500.map{|y| y.verify(thread: true){ |c| verified_symbols << c }}.join
# after a while
puts verified_symbols.size => 456
If the verification is performed asynchron, the thread itself is returned for joining. The results must compiled through the block (as shown above).