SwiftAvroCore

// The JSON schema
let jsonSchema = """
{"type":"record",
"fields":[
{"name": "requestId", "type": "int"},
{"name": "requestName", "type": "string"},
{"name": "parameter", "type": {"type":"array", "items": "int"}}
]}
"""

// main.swift
import Foundation
import SwiftAvroCore

// Define your model in Swift
struct Model: Encodable {
    let requestId: Int32 = 1
    let requestName: String = "hello"
    let parameter: [Int32] = []
}

// Make an Avro instance
let avro = Avro()
let myModel = Model(requestId: 42, requestName: "hello", parameter: [1,2])

// Decode schema from json
_ = avro.decodeSchema(schema: jsonSchema)!

// encode to avro binray
let binaryValue = try!avro.encode(myModel)

// decode from avro binary
let decodedValue: Model = try! avro.decode(from: binaryValue)

// check result
print("\(decodedValue.requestId), \(decodedValue.requestName), \(decodedValue.parameter)")

// decode from avro binary to Any Type in case of the receiving type unknown
let decodedAnyValue = try! avro.decode(from: binaryValue)

// check type
type(of: decodedAnyValue!)

let encodedSchema = try avro.encodeSchema(schema: schema)

print(String(bytes: encodedSchema!, encoding: .utf8)!)

// define codec
let codec = NullCodec(codecName: AvroReservedConstants.NullCodec)

// define 2 File Object Containers
var oc1 = try? ObjectContainer(schema: """
{
    "type": "record",
    "name": "test",
    "fields" : [
        {"name": "a", "type": "long"},
        {"name": "b", "type": "string"}]
}
""", codec: codec)
var oc2 = oc1

// test model
struct model: Codable {
    var a: UInt64 = 1
    var b: String = "hello"
}

// add model to container
try oc1?.addObject(model())

// encode object
let out = try! oc1?.encodeObject()

// write to file
try out?.write(to: URL(fileURLWithPath: "/location/to/save/file"))

// decode object heade
try oc2?.decodeHeader(from: out!)

// decode objec
let start = oc2?.findMarker(from: out!)
try oc2?.decodeBlock(from: out!.subdata(in: start!..<out!.count))

// the result: oc1?.blocks[0].data

struct testArg {

// sample protocol
let supportProtocol: String = """
{
  "namespace": "com.acme",
  "protocol": "HelloWorld",
  "doc": "Protocol Greetings",
  "types": [
     {"name": "Greeting", "type": "record", "fields": [{"name": "message", "type": "string"}]},
     {"name": "Curse", "type": "error", "fields": [{"name": "message", "type": "string"}]}],
  "messages": {
    "hello": {
       "doc": "Say hello.",
       "request": [{"name": "greeting", "type": "Greeting" }],
       "response": "Greeting",
       "errors": ["Curse"]
    }
  }
}
"""

let arg = 
// client hash
let clientHash: [UInt8] = [UInt8]([0x0,0x1,0x2,0x3,0x4,0x5,0x6,0x7,0x8,0xA,0xB,0xC,0xD,0xE,0xF,0x10])

// server hash
let serverHash: [UInt8] = [UInt8]([0x1,0x1,0x2,0x3,0x4,0x5,0x6,0x7,0x8,0xA,0xB,0xC,0xD,0xE,0xF,0x10])

// create a conversation context
let context: Context = Context(requestMeta:[String: [UInt8]](),
                                   responseMeta:[String: [UInt8]]())
}

let arg = testArg() 

// create a server                                  
let server = try MessageResponse(context: arg.context, serverHash: arg.serverHash, serverProtocol: arg.supportProtocol)

// create a client
let client = try MessageRequest(context: arg.context, clientHash: arg.serverHash, clientProtocol: arg.supportProtocol)
        
// hand shake
let requestData = try client.encodeHandshakeRequest(request: HandshakeRequest(clientHash: arg.serverHash, clientProtocol: arg.supportProtocol, serverHash: arg.serverHash))
try client.addSession(hash: arg.serverHash, protocolString: arg.supportProtocol)
let (requestHandshake,resposeNone) = try server.resolveHandshakeRequest(requestData: requestData)
let (r, got) = try client.decodeResponse(responseData:resposeNone)

// request and response
struct requestMessage:Codable {
    var message: String = "requestData"
}

let requestMessageData = requestMessage()
let msgData = try client.writeRequest(messageName: "hello", parameters: [requestMessageData])
var expectData = Data()
expectData.append(contentsOf: [0,10]) // empty meta and length of message name
expectData.append("hello".data(using: .utf8)!) // message name
expectData.append(contentsOf: [22]) // length of message
expectData.append("requestData".data(using: .utf8)!) //message

let (requestHeader,request) = try server.readRequest(header: requestHandshake, from: msgData) as (RequestHeader, [requestMessage])

struct responseMessage:Codable {
    var message: String = "responseData"
}
let resMsg = responseMessage()
let resData = try server.writeResponse(header: requestHandshake, messageName: requestHeader.name, parameter: resMsg)
expectData = Data()
expectData.append(contentsOf: [0,0,24]) // empty meta, false flag and length of message name
expectData.append("responseData".data(using: .utf8)!)

let (responseHeader, gotResponse) = try client.readResponse(header: requestHandshake, messageName: "hello", from: resData)  as (ResponseHeader, [responseMessage])

// framing and deframing
var testData = Data([1,2,3,4,5])
testData.framing(frameLength: 4)
let deframed = testData.deFraming()