Message-based Communication
Message-based Communication 관련
Similarly, the Gear Protocol operates based on user or program interactions.
Note
Programs on Gear can also interact with each other.
So here is a detailed explanation to the whole communication flow in Gear.
User Interaction and @gear-js/api
When a user (actor) interacts with the dApp's UI elements (like buttons or forms), _@gear-js/api_ (which is integrated into the UI) captures these interactions. Based on the interactions, it extracts information and potentially pre-defined message formats, and then contracts a message object containing the user's intent or request.
How to Send Messages
The constructed message object encapsulates the user's input and becomes the data @gear-js/api transmits across the Vara Network to the Gear crate within the program.
How the Program Receives and Processes Messages
Gear (crate) delivers the message object to the appropriate program deployed on the Vara Network based on the location the user initiated the action. The Gear crate within the program utilizes functions like msg::load() and access the delivered message object, which the program extracts information (such as payload, source, messsageId) from, and process it according to how it's designed by the developer.
How to Generate a Reply
Based on the processed input, the program creates a new message object containing a reply (response in web2) to the user's action or interaction (called reply) to or for the user.
Note, the program typically doesn't send the original message object back, it generates a new one based message received, which a reply is sent back to be received by @gear-js/api using the gstd crate from the program utilizing functions like the msg::reply or msg::reply_bytes.
UI Update
@gear-js/api, within the dApp, receives the reply message object delivered by the gstd crate from the program across the Vara Network and extracts the response data from the reply object, and finally updates the UI reflecting the program's response to the user's interaction.
And that's pretty much the communication between the Users, Client(dApp), Gear Protocol(gstd), and finally Vara Network.