(Swift) Viewing a Simple Three-Step Execution Plan

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This example demonstrates a straightforward, valid dependency chain that results in a three-step execution plan. The goal is not to execute the requests, but to inspect how the plan is constructed using ExaminePlan.

The target curl command requires {{order_id}}. A helper function is defined to produce order_id, but it depends on customer_id. Another helper function produces customer_id, which depends on account_name.

Because account_name is provided as a known input, the dependency chain can be fully resolved:

• customer_id is obtained from account_name
• order_id is obtained from customer_id
• The target curl command uses order_id

When ExaminePlan is called, it builds and returns a three-step execution plan showing the order in which each function would be executed.

Note: This example requires Chilkat v11.5.0 or greater.

For more information, see https://www.chilkatsoft.com/curl_dependency_engine.asp

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func chilkatTest() {
    var success: Bool = false

    let httpCurl = CkoHttpCurl()!

    // The target curl command requires {{order_id}}.
    var targetCurl: String? = "curl -X GET https://api.example.com/orders/{{order_id}}"

    // Define a helper function that produces order_id from customer_id.
    var fnName: String? = "getOrderId"
    httpCurl.addFunction(fnName, curl: "curl -X GET https://api.example.com/order-id?customer={{customer_id}}")
    httpCurl.addOutput(fnName, jsonPath: "order.id", varName: "order_id")

    // Define a helper function that produces customer_id from account_name.
    fnName = "getCustomerId"
    httpCurl.addFunction(fnName, curl: "curl -X GET https://api.example.com/customer-id?account={{account_name}}")
    httpCurl.addOutput(fnName, jsonPath: "customer.id", varName: "customer_id")

    // Provide the starting known input.
    httpCurl.setVar("account_name", varValue: "acme")

    // Examine the execution plan without running any requests.
    let planJson = CkoJsonObject()!
    planJson.emitCompact = false

    success = httpCurl.examinePlan(targetCurl, json: planJson)

    // Success is expected to be true.
    print("success = \(success)")

    print("\(planJson.emit()!)")

    // Expected result:
    // 
    // {
    //   "plan": [{
    //     "function": "getCustomerId",
    //     "inputs": ["account_name"],
    //     "outputs": ["customer_id"]
    //   },{
    //     "function": "getOrderId",
    //     "inputs": ["customer_id"],
    //     "outputs": ["order_id"]
    //   },{
    //     "function": "targetCurl",
    //     "inputs": ["order_id"],
    //     "outputs": []
    //   }]
    // }

}