Generated by XState Viz: https://xstate.js.org/viz

machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const indexMachine = Machine({
    id: 'indexer',
    initial: 'idle',
    context: {
      totalBlocks: 200,
      indexedBlocks: 150,
      prevIndexedBlocks: 120,
      indexStartTime: Date.now(),
      error: null
    },
    states: {
      idle: {
        on: {
          START: {
            target: 'indexing',
            actions: assign({
              indexStartTime: Date.now(),
              prevIndexedBlocks: (context) => context.indexedBlocks,
              totalBlocks: (context, event) => event.newTotalBlocks || context.totalBlocks
            })
          },
          PAUSE: 'paused'
        }
      },
      indexing: {
        on: {
          PROGRESS: {
            target: 'indexing',
            actions: assign({
              indexedBlocks: (context, event) => context.indexedBlocks + (event.indexedBlocks || 1),
              totalBlocks: (context, event) => event.newTotalBlocks || context.totalBlocks
            })
          },
          COMPLETE: 'idle',
          ERROR: {
            target: 'error',
            actions: assign({
              error: (context, event) => event.error
            })
          },
          PAUSE: 'paused'
        }
      },
      paused: {
        on: {
          UNPAUSE: 'idle'
        }
      },
      error: {
        on: {
          START: {
            target: 'indexing',
            actions: assign({
              indexStartTime: Date.now()
            })
          },
        }
      }
    }
  });