Function buildHelpMessage

main.go:218–290

(helpMessage string, queryString string, queryStmt *sql.Stmt, serverPort uint)

}

func buildHelpMessage(helpMessage string, queryString string, queryStmt *sql.Stmt, serverPort uint) string {
	helpMessage += fmt.Sprintf(`Query:
	%s

`, queryString)

	queryParamsCount, err := countParams(queryStmt)
	if err != nil {
		log.Printf("Error extracting params count from query: %v\n", err)
	} else {
		helpMessage += fmt.Sprintf(`Params count (question marks in query):
	%d

`, queryParamsCount)
	}

	helpMessage += fmt.Sprintf(`Request examples:
	$ echo -e "$QUERY1_PARAM1,$QUERY1_PARAM2\n$QUERY2_PARAM1,$QUERY2_PARAM2" curl "http://$ADDRESS:%d/query" --data-binary @-
	$ curl "http://$ADDRESS:%d/query" -d "$PARAM_1,$PARAM_2,...,$PARAM_N"

	- Request must be a HTTP POST to "http://$ADDRESS:%d/query".
	- Request body must be a valid CSV.
	- Request body must not have a CSV header.
	- Each request body line is a different query.
	- Each param in a line corresponds to a query param (a question mark in the query string).
	- Static query (without any query params):
		- The request must be a HTTP GET to "http://$ADDRESS:%d/query".
		- The query executes only once.

`, serverPort, serverPort, serverPort, serverPort)

	helpMessage += fmt.Sprintf(`Response example:
	$ echo -e "github.com\none.one.one.one\ngoogle-public-dns-a.google.com" | curl "http://$ADDRESS:%d/query" --data-binary @-
	[
		{
			"in": ["github.com"],
			"headers": ["ip","dns"],
			"out": [
				["192.30.253.112","github.com"],
				["192.30.253.113","github.com"]
			]
		},
		{
			"in": ["one.one.one.one"],
			"headers": ["ip","dns"],
			"out": [
				["1.1.1.1","one.one.one.one"]
			]
		},
		{
			"in": ["google-public-dns-a.google.com"],
			"headers": ["ip","dns"],
			"out": [
				["8.8.8.8","google-public-dns-a.google.com"]
			]
		}
	]