chore(refactor): split up and add tests for core functionality

src/api/viya/saveLog.ts

@@ -0,0 +1,40 @@
+import { createFile } from '@sasjs/utils/file'
+import { Job } from '../..'
+import { RequestClient } from '../../request/RequestClient'
+import { fetchLogByChunks } from '../../utils'
+
+export async function saveLog(
+  job: Job,
+  requestClient: RequestClient,
+  shouldSaveLog: boolean,
+  logFilePath: string,
+  accessToken?: string
+) {
+  if (!shouldSaveLog) {
+    return
+  }
+
+  if (!accessToken) {
+    throw new Error(
+      `Logs for job ${job.id} cannot be fetched without a valid access token.`
+    )
+  }
+
+  const logger = process.logger || console
+  const jobLogUrl = job.links.find((l) => l.rel === 'log')
+
+  if (!jobLogUrl) {
+    throw new Error(`Log URL for job ${job.id} was not found.`)
+  }
+
+  const logCount = job.logStatistics?.lineCount ?? 1000000
+  const log = await fetchLogByChunks(
+    requestClient,
+    accessToken,
+    `${jobLogUrl.href}/content`,
+    logCount
+  )
+
+  logger.info(`Writing logs to ${logFilePath}`)
+  await createFile(logFilePath, log)
+}