(PowerShell) 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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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

$httpCurl = New-Object Chilkat.HttpCurl

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

# Define a helper function that produces order_id from customer_id.
$fnName = "getOrderId"
$httpCurl.AddFunction($fnName,"curl -X GET https://api.example.com/order-id?customer={{customer_id}}")
$httpCurl.AddOutput($fnName,"order.id","order_id")

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

# Provide the starting known input.
$httpCurl.SetVar("account_name","acme")

# Examine the execution plan without running any requests.
$planJson = New-Object Chilkat.JsonObject
$planJson.EmitCompact = $false

$success = $httpCurl.ExaminePlan($targetCurl,$planJson)

# Success is expected to be $true.
$("success = " + $success)

$($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": []
#   }]
# }