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machine.js

const getBlobMetadata = () => new Promise(res => {
  setTimeout(() => {
    console.log('yeah')
    res({
      Path: 'somepath.csv'
    });
  }, 2000)
});

const readFile = () => new Promise((res, rej) => {
  setTimeout(() => {
    if (Math.random() < .4) {
      res([1, 2, 3, 4, 5]);
    } else {
      rej();
    }
  }, 1000)
});

const machine = Machine({
  id: 'location-based data processing',
  initial: 'pending',
  context: {
    blobMeta: null,
    users: null
  },
  states: {
    pending: {
      on: {
        'HTTP Request Trigger': 'get blob metadata'
      }
    },
    'get blob metadata': {
      invoke: {
        id: 'blob metadata task',
        src: getBlobMetadata,
        onDone: {
          target: 'create container group',
          actions: assign({
            blobMeta: (_, e) => e.data
          })
        }
      }
    },
    'create container group': {
      invoke: {
        id: 'container group task',
        src: () => () => {}, // fire-and-forget
      },
      states: {
        'waiting for file': {
          invoke: {
            id: 'read file task',
            src: readFile,
            onDone: {
              target: 'file found',
              actions: assign({
                users: (_, e) => e.data
              })
            },
            onError: '.'
          }
        },
        'file found': {
          type: 'final'
        }
      },
      onDone: 'success'
    },
    'success': {
      type: 'final'
    }
  }
})