feat(cron): added the support for json type schedule to cron api (#21340)

Added the support for JSON type schedule to cron API; previously it was string only.
fixes #21122

1 files changed, 67 insertions, 1 deletions

diff --git a/ext/cron/01_cron.ts b/ext/cron/01_cron.ts
index 30343905c..4a5250618 100644
--- a/ext/cron/01_cron.ts
+++ b/ext/cron/01_cron.ts
@@ -3,9 +3,73 @@
 // @ts-ignore internal api
 const core = Deno.core;
 
+export function formatToCronSchedule(
+  value?: number | { exact: number | number[] } | {
+    start?: number;
+    end?: number;
+    every?: number;
+  },
+): string {
+  if (value === undefined) {
+    return "*";
+  } else if (typeof value === "number") {
+    return value.toString();
+  } else {
+    const { exact } = value as { exact: number | number[] };
+    if (exact === undefined) {
+      const { start, end, every } = value as {
+        start?: number;
+        end?: number;
+        every?: number;
+      };
+      if (start !== undefined && end !== undefined && every !== undefined) {
+        return start + "-" + end + "/" + every;
+      } else if (start !== undefined && end !== undefined) {
+        return start + "-" + end;
+      } else if (start !== undefined && every !== undefined) {
+        return start + "/" + every;
+      } else if (start !== undefined) {
+        return start + "/1";
+      } else if (end === undefined && every !== undefined) {
+        return "*/" + every;
+      } else {
+        throw new TypeError("Invalid cron schedule");
+      }
+    } else {
+      if (typeof exact === "number") {
+        return exact.toString();
+      } else {
+        return exact.join(",");
+      }
+    }
+  }
+}
+
+export function parseScheduleToString(
+  schedule: string | Deno.CronSchedule,
+): string {
+  if (typeof schedule === "string") {
+    return schedule;
+  } else {
+    const {
+      minute,
+      hour,
+      dayOfMonth,
+      month,
+      dayOfWeek,
+    } = schedule;
+
+    return formatToCronSchedule(minute) +
+      " " + formatToCronSchedule(hour) +
+      " " + formatToCronSchedule(dayOfMonth) +
+      " " + formatToCronSchedule(month) +
+      " " + formatToCronSchedule(dayOfWeek);
+  }
+}
+
 function cron(
   name: string,
-  schedule: string,
+  schedule: string | Deno.CronSchedule,
   handlerOrOptions1:
     | (() => Promise<void> | void)
     | ({ backoffSchedule?: number[]; signal?: AbortSignal }),
@@ -20,6 +84,8 @@ function cron(
     throw new TypeError("Deno.cron requires a valid schedule");
   }
 
+  schedule = parseScheduleToString(schedule);
+
   let handler: () => Promise<void> | void;
   let options: { backoffSchedule?: number[]; signal?: AbortSignal } | undefined;