BoAT Support Layer

To understand the BoAT Support Layer, it's necessary to first understand the BoAT Infra Arch.

The BoAT Infra Arch is a cross-platform application framework that provides a unified cross-platform application abstraction interface for BoAT applications by abstracting different application APIs of diverse platforms. BoAT applications can quickly realize portability between different platforms by calling these abstract interfaces.

The BoAT Infra Arch consists of four layers:

1. The OS platform layer provides basic operating system support and system call API interfaces of each OS platform for the upper layer.

2. The BoAT Support Layer is the core layer of the BoAT Infra Arch architecture which provides a unified cross-platform application abstraction interface to the upper layer. It implements instances of cross-platform application abstraction interfaces according to system call API interfaces provided by different platforms. The cross-platform abstraction interface is compiled and selected through conditional compilation and provided for upper layer calls.

3. The Composable BoAT Core is the core component of BoAT's functionality which is implemented using the cross-platform application abstraction interface provided by the BoAT Support Layer. It supports various blockchain operations, such as on-chain transactions and queries, etc.

4. The Application layer can implement application functionality directly using the cross-platform application abstraction interface provided by the BoAT Support Layer. It can also use the blockchain operation interface provided by the Composable BoAT Core, which is called the BoAT Engine, to interact with various blockchains.

What Functions does the BoAT Support Layer Implement?

The BoAT Support Layer is the core pillar layer of the BoAT Infra Arch architecture. All applications implemented based on the BoAT Infra Arch architecture are based on the BoAT Support Layer layer. The BoAT Support Layer provides unified cross-platform application abstraction interfaces to the application layer and the Composable BoAT Core layer. The layer below it provides the concrete instances of the abstract interfaces based on the system APIs provided by different platforms. Applications call the unified cross-platform application abstraction interface to indirectly call the system APIs that are adapted to the platform to implement the application functions.

BoAT Support Layer Components

OSAL（Operating System Abstraction Layer）:

The Operating System Abstraction Layer defines cross-platform application abstraction interfaces for platform-specific operational system-related abstract objects. The interface is implemented according to different platform operating system abstract object interfaces. Generally, it includes system functional abstraction objects such as semaphores, tasks, timers, and queues.

DAL（Driver Abstraction Layer）:

The Driver Abstraction Layer defines cross-platform application abstraction interfaces for platform-specific driver abstract objects. The interface is implemented according to the interface definition of different platform operating system abstract object interfaces. Generally, it includes system functional abstraction objects such as UART, I2C, virtual AT, and storage.

BoAT Common Components:

The BoAT Common Components include cross-platform application common interfaces related to blockchain applications. They are not only used by blockchain applications, but can also be called by other applications. They include keypair, keystore, third-party, and other common components.

Directory Description

BoAT-SupportLayer

<BoAT-SupportLayer>
|
+---common            | Universal soft algorithms implementation
|   \---http2intf     |     Universal soft algorithms implementation
|   \---rpc           |     rpc interface
|   \---storage       |     interface for storing data or files
|   \---utilities     |     Utility APIs
+---include           | Header files for application to include
+---keypair           | Interface for generating and managing key pairs
+---keystore          | Store a series of Secret Keys, Key Pairs, or Certificates
|   +---SE            |     Keystore Interface Implemented by Security Chip
|   \---soft          |     Keystore Interface Implemented by Software
+---platform          | Implementation of Abstract Interfaces on Different Operating Platforms
|   +---Chin...DCLN   |     Implementation of Abstract Interface in ChinaMobile-ML307A-DCLN
|   +---Fibocom-L610  |     Implementation of Abstract Interface in Fibocom-L610
|   +---include       |     Header files for platform internal use
|   +---linux-default |     Implementation of Abstract Interface in ChinaMobile-ML307A-DCLN
+---tests             | Test cases
+---third-party       |     Third party libraries
|   \---cJSON         |     JSON parsing interface for C language 
|   \---crypto        |     Including various software encryption algorithms
|   \---nghttp2       |     HTTP/2 library implemented by C language
|   \---protobuf-c    |     protobuf interface
|   \---protos        |     protos interface
|   +---rlp           |     RLP encoder

Usage Instructions

Refer to the README.md of BoAT-ProjectTemplate for the compilation and application of BoAT-SupportLayer.

https://github.com/aitos-io/BoAT-ProjectTemplate/blob/dev/README.md