Since it's depended on by `.data` stuff as well as pretty much
everything else, makes more sense to expose it as a top level module
(and maybe eventually as a subpkg as we add to it).
Not sure why i ever thought it would work otherwise but, obviously if
you're replicating a `Position` from a **summary** (IPC) msg we
need to wipe any prior clearing events from the events history..
The main use for this loading mechanism is precisely if you don't have
local access to the txn ledger and need to represent a position from
a summary 🤦
Also, never bother with ledger file fqme "rewriting" if the backend has
no symcache support (yet) since obviously there's then no symbol set to
search for a better key xD
Previously we weren't necessarily serializing mkt pairs (for IPC msging)
entirely bc the assets `.src/.dst` were being sent just by their
str-names. This now properly supports fully serializing `Asset`s as
`dict`-msgs such that use of `MktPair.to_dict()` can be transmitted over
`tractor.MsgStream`s and deserialized entirely back to struct from on
the receiver end.
Deats:
- implement `Asset.to_dict()` and `.from_msg()`
- adjust `MktPair.to_dict()` and `.from_msg()` to use these methods.
- drop all the hacky "if .src/.dst is str" handling.
- add better `MktPair.from_fqme()` input handling for expiry and venue;
ensure that either can be extracted from passed fqme *and* if so they
are also popped from any duplicate passed in `**kwargs**`.
For crypto derivatives (at least futes), yes they are margined, but
generally not around a single unit of vlm (like equities or commodities
futes) so don't pre-set the order mode allocator to use a #unit limit,
$limit is fine.
Only stuff left was the allocator stuff. Drop the top level subpkg
exports and finally kill off the awkwardly named
`Symbol.lot_size_digits` properties XD
Expose a bunch more util funcs at subpkg top level, do some typing in
allocator method internals.
Since most (legacy) stock brokers design their symbology without
including the target exchange's source asset name - normally a fiat
currency like USD - this adds an option for rendering market endpoints
without that token for simpler use in backends for such brokers.
As an example IB doesn't expect a `mnq/usd.cme.ib` symbol and instead
presumes that since the CME lists all assets in USD then the source
asset is implied.
Impl details:
- add `MktPair.pair: str` which replaces `.key` as a better name.
- offer a `without_src: bool` to a new `.get_fqme()` getter method
which will render everything the same minus the src token.
- expose the new flag through both the new `.get_fqme()` and
`.get_bs_fqme()` methods and wrap those both under the original
property names `.bs_fqme` and `.fqme`.
It needed some work..
- Make `unpack_fqme()` always return a 4-tuple handling the venue and
suffix parts more generally.
- add `Asset.Asset.guess_from_mkt_ep_key()` a like-it-sounds hack at
trying to render a `.dst: Asset` for most most purposes throughout the
stack.
- always try to preprocess the input `fqme: str` with `unpack_fqme()` in
`MktPair.from_fqme()` and use the new `Asset` method (above) to make
up a `.dst: Asset` pulling as much meta-info we can from the caller.
- add `MktPair.bs_fqme` to get the thing without the broker part..
- add an `'unknown'` value to the `_derivs` def.
- drop `Symbol.from_fqsn()` and `unpack_fqsn()` more generally (yes
BREAKING).
Accept a msg with any of:
- `.src: Asset` and `.dst: Asset`
- `.src: str` and `.dst: str`
- `.src: Asset` and `.dst: str`
but not the final combo tho XD
Also, fix `.key` to properly cast any `.src: Asset` to string!
To be compat with the `Symbol` (for now) and generally allow for reading
the (derivative) contract specific part of the fqme. Adjust
`contract_info: list[str]` and make `src: str = ''` by default.
Handle case where `'dst'` field is just a `str` (in which case delegate to
`.from_fqme()`) as well as do `Asset` loading and use our
`Struct.copy()` to enforce type-casting to (for eg. `Decimal`s) such
that we'll now capture typing errors despite IPC transport.
Change `Symbol.tick_size` and `.lot_tick_size` defaults to decimal
for proper casting and type `MktPair.atype: str` since `msgspec` can't
cast to `AssetTypeName` without special handling..
Prepping to entirely replace `Symbol`; this adds a buncha docs/comments,
better implementation for representing and parsing the FQME: "fully
qualified market endpoint".
Deatz:
- make `.src` an optional field until we figure out how we're going
to support loading source assets from all backends sensibly..
- implement `MktPair.fqme: str` (what was previously called `fqsn`)
using a new util func: `maybe_cons_tokens()`.
- `Symbol.brokers` and expect only `.broker` usage.
- remap anything with `fqsn` in the name to `fqme` with aliases from the
old name.
- implement `unpack_fqme()` with `match:` syntax B)
- add `MktPair.tick_size_digits`, `.lot_size_digits`, `.fqsn`, `.key` for
backward compat.
- make all fqme generation related fields empty `str`s by default.
- add `MktPair.resolved: bool` a flag indicating whether or not `.dst`
is an `Asset` instance or just a string and, `.bs_mktid` the field
to hold the "backend system market id" per broker.
Drop everything we can in terms of methods and attrs from `Symbol`:
- kill `.tokens()`, `.front_feed()`, `.tokens()`, `.nearest_tick()`,
`.front_fqsn()`, instead moving logic from these methods into
dependents (and obviously removing any usage from rest of code base,
coming in follow up commits).
- rename `.quantize_size()` -> `.quantize()`.
- re-implement `.brokers`, `.lot_size_digits`, `.tick_size_digits` as
`@property` methods; for the latter two, allows us to minimize to only
accepting min tick decimal values on alternative constructor class
methods and to drop the equivalent instance vars.
- map `_fqsn` related variable names to new and preferred `_fqme`.
We also juggle around some utility functions, moving limited precision
related `decimal.Decimal` routines to the top of module and soon-to-be
legacy `fqsn` related routines to the bottom.
`MktPair` draft type extensions:
- drop requirements for `src_type`, and offer the optional `.dst_type`
field as either a `str` or (new `typing.Literal`) `AssetTypeName`.
- define an equivalent `.quantize()` as (re)defined in `Symbol` but with
`quantity_type: str` field which specifies whether to use the price or
the size precision.
- add a lot more docs, a `.key` property for the "symbol" name, draft
property for a `.fqme: str`
- allow `.src` and `.dst` to be of type `str | Asset`
Add a new `Asset` to capture "things which can be used in markets and/or
transactions" XD
- defines a `.name`, `.atype: AssetTypeName` a financial category tag, `tx_tick:
Decimal` the precision limit for transactions and of course
a `.quantime()` method for doing accounting arithmetic on a given tech
stack.
- define the `atype: AssetTypeName` type as a finite set of `str`s
expected to be used in various ways for default settings in other
parts of the data and order control layers..
Tyler Goodlet