Author Topic: Understand the Bitshares-core code  (Read 1458 times)

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Offline pc

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Good questions.

You might want to start looking at database::_apply_transaction (in db_block.cpp). Like all core code, this is in the libraries/chain module.
A few levels deeper you will see that for every blockchain operation there is an evaluator. Evaluators are grouped together in files, e. g. market_evaluator.cpp contains all evaluators for market-related operations.

It's a bit difficult to follow the execution paths. because some of the logic is hidden in static_variant objects that use the visitor pattern to find the relevant code for the specific object inside the static_variant. I'd suggest to skip over the static_variant stuff when reading the code, it's a bit tricky to understand.

Being a C programmer turned Java programmer turned C++ programmer myself, I'd like to warn you about a few traps. C++ reads almost like Java, but there are a few significant differences:

* Destructors are important in C++
* By default, methods are called by-value, not by-reference.
* Method lookup works differently in C++, in particular wrt overloaded methods.
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Offline xeroc

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Look for 'limit_order_create_operation' it has a validator, an evaluator and an apply-er that tells you what is going on.

Offline Victor118

Hello, I am a Java / Javascript developer.
I would like to understand the code of Bitshares core.
Is there any documentation?
When I look at the code I do not understand, obviously I have to learn C ++ (it's in progress).

I would like to understand where is the code that determines the code to execute according to the type of transaction?

For example:
 what is the called method sequence when a limit order creation transaction is transferred to the blockchain?
What code is executed when a witness add new price feed for a smart asset and the margin call logic ?
Sorry for my bad English and these noob questions !!