Inngest Workflow

npm install @mastra/inngest @mastra/core @mastra/deployer @hono/node-server @ai-sdk/openai
 
docker run --rm -p 8288:8288 \
  inngest/inngest \
  inngest dev -u http://host.docker.internal:3000/inngest/api

import { Agent } from '@mastra/core/agent'
import { openai } from '@ai-sdk/openai'
 
// Create a new planning agent that uses the OpenAI model
const planningAgent = new Agent({
  name: 'planningAgent',
  model: openai('gpt-4o'),
  instructions: `
        You are a local activities and travel expert who excels at weather-based planning. Analyze the weather data and provide practical activity recommendations.
 
        📅 [Day, Month Date, Year]
        ═══════════════════════════
 
        🌡️ WEATHER SUMMARY
        • Conditions: [brief description]
        • Temperature: [X°C/Y°F to A°C/B°F]
        • Precipitation: [X% chance]
 
        🌅 MORNING ACTIVITIES
        Outdoor:
        • [Activity Name] - [Brief description including specific location/route]
          Best timing: [specific time range]
          Note: [relevant weather consideration]
 
        🌞 AFTERNOON ACTIVITIES
        Outdoor:
        • [Activity Name] - [Brief description including specific location/route]
          Best timing: [specific time range]
          Note: [relevant weather consideration]
 
        🏠 INDOOR ALTERNATIVES
        • [Activity Name] - [Brief description including specific venue]
          Ideal for: [weather condition that would trigger this alternative]
 
        ⚠️ SPECIAL CONSIDERATIONS
        • [Any relevant weather warnings, UV index, wind conditions, etc.]
 
        Guidelines:
        - Suggest 2-3 time-specific outdoor activities per day
        - Include 1-2 indoor backup options
        - For precipitation >50%, lead with indoor activities
        - All activities must be specific to the location
        - Include specific venues, trails, or locations
        - Consider activity intensity based on temperature
        - Keep descriptions concise but informative
 
        Maintain this exact formatting for consistency, using the emoji and section headers as shown.
      `,
})
 
export { planningAgent }

import { z } from 'zod'
 
const { createWorkflow, createStep } = init(
  new Inngest({
    id: 'mastra',
    baseUrl: `http://localhost:8288`,
  })
)
 
// Helper function to convert weather codes to human-readable descriptions
function getWeatherCondition(code: number): string {
  const conditions: Record<number, string> = {
    0: 'Clear sky',
    1: 'Mainly clear',
    2: 'Partly cloudy',
    3: 'Overcast',
    45: 'Foggy',
    48: 'Depositing rime fog',
    51: 'Light drizzle',
    53: 'Moderate drizzle',
    55: 'Dense drizzle',
    61: 'Slight rain',
    63: 'Moderate rain',
    65: 'Heavy rain',
    71: 'Slight snow fall',
    73: 'Moderate snow fall',
    75: 'Heavy snow fall',
    95: 'Thunderstorm',
  }
  return conditions[code] || 'Unknown'
}
 
const forecastSchema = z.object({
  date: z.string(),
  maxTemp: z.number(),
  minTemp: z.number(),
  precipitationChance: z.number(),
  condition: z.string(),
  location: z.string(),
})

 
const fetchWeather = createStep({
  id: 'fetch-weather',
  description: 'Fetches weather forecast for a given city',
  inputSchema: z.object({
    city: z.string(),
  }),
  outputSchema: forecastSchema,
  execute: async ({ inputData }) => {
    if (!inputData) {
      throw new Error('Trigger data not found')
    }
 
    // Get latitude and longitude for the city
    const geocodingUrl = `https://geocoding-api.open-meteo.com/v1/search?name=${encodeURIComponent(inputData.city)}&count=1`
    const geocodingResponse = await fetch(geocodingUrl)
    const geocodingData = (await geocodingResponse.json()) as {
      results: { latitude: number; longitude: number; name: string }[]
    }
 
    if (!geocodingData.results?.[0]) {
      throw new Error(`Location '${inputData.city}' not found`)
    }
 
    const { latitude, longitude, name } = geocodingData.results[0]
 
    // Fetch weather data using the coordinates
    const weatherUrl = `https://api.open-meteo.com/v1/forecast?latitude=${latitude}&longitude=${longitude}&current=precipitation,weathercode&timezone=auto,&hourly=precipitation_probability,temperature_2m`
    const response = await fetch(weatherUrl)
    const data = (await response.json()) as {
      current: {
        time: string
        precipitation: number
        weathercode: number
      }
      hourly: {
        precipitation_probability: number[]
        temperature_2m: number[]
      }
    }
 
    const forecast = {
      date: new Date().toISOString(),
      maxTemp: Math.max(...data.hourly.temperature_2m),
      minTemp: Math.min(...data.hourly.temperature_2m),
      condition: getWeatherCondition(data.current.weathercode),
      location: name,
      precipitationChance: data.hourly.precipitation_probability.reduce(
        (acc, curr) => Math.max(acc, curr),
        0
      ),
    }
 
    return forecast
  },
})

const planActivities = createStep({
  id: 'plan-activities',
  description: 'Suggests activities based on weather conditions',
  inputSchema: forecastSchema,
  outputSchema: z.object({
    activities: z.string(),
  }),
  execute: async ({ inputData, mastra }) => {
    const forecast = inputData
 
    if (!forecast) {
      throw new Error('Forecast data not found')
    }
 
    const prompt = `Based on the following weather forecast for ${forecast.location}, suggest appropriate activities:
      ${JSON.stringify(forecast, null, 2)}
      `
 
    const agent = mastra?.getAgent('planningAgent')
    if (!agent) {
      throw new Error('Planning agent not found')
    }
 
    const response = await agent.stream([
      {
        role: 'user',
        content: prompt,
      },
    ])
 
    let activitiesText = ''
 
    for await (const chunk of response.textStream) {
      process.stdout.write(chunk)
      activitiesText += chunk
    }
 
    return {
      activities: activitiesText,
    }
  },
})

const planIndoorActivities = createStep({
  id: 'plan-indoor-activities',
  description: 'Suggests indoor activities based on weather conditions',
  inputSchema: forecastSchema,
  outputSchema: z.object({
    activities: z.string(),
  }),
  execute: async ({ inputData, mastra }) => {
    const forecast = inputData
 
    if (!forecast) {
      throw new Error('Forecast data not found')
    }
 
    const prompt = `In case it rains, plan indoor activities for ${forecast.location} on ${forecast.date}`
 
    const agent = mastra?.getAgent('planningAgent')
    if (!agent) {
      throw new Error('Planning agent not found')
    }
 
    const response = await agent.stream([
      {
        role: 'user',
        content: prompt,
      },
    ])
 
    let activitiesText = ''
 
    for await (const chunk of response.textStream) {
      process.stdout.write(chunk)
      activitiesText += chunk
    }
 
    return {
      activities: activitiesText,
    }
  },
})

 
const activityPlanningWorkflow = createWorkflow({
  id: 'activity-planning-workflow-step2-if-else',
  inputSchema: z.object({
    city: z.string().describe('The city to get the weather for'),
  }),
  outputSchema: z.object({
    activities: z.string(),
  }),
})
  .then(fetchWeather)
  .branch([
    [
      // If precipitation chance is greater than 50%, suggest indoor activities
      async ({ inputData }) => {
        return inputData?.precipitationChance > 50
      },
      planIndoorActivities,
    ],
    [
      // Otherwise, suggest a mix of activities
      async ({ inputData }) => {
        return inputData?.precipitationChance <= 50
      },
      planActivities,
    ],
  ])
 
activityPlanningWorkflow.commit()
 
export { activityPlanningWorkflow }

import { Mastra } from '@mastra/core/mastra'
import { serve as inngestServe } from '@mastra/inngest'
import { createLogger } from '@mastra/core/logger'
import { Inngest } from 'inngest'
import { activityPlanningWorkflow } from './workflows/inngest-workflow'
import { planningAgent } from './agents/planning-agent'
import { realtimeMiddleware } from '@inngest/realtime'
 
// Create an Inngest instance for workflow orchestration and event handling
const inngest = new Inngest({
  id: 'mastra',
  baseUrl: `http://localhost:8288`,  // URL of your local Inngest server
  isDev: true,
  middleware: [realtimeMiddleware()], // Enable real-time updates in the Inngest dashboard
})
 
// Create and configure the main Mastra instance
export const mastra = new Mastra({
  vnext_workflows: {
    activityPlanningWorkflow,
  },
  agents: {
    planningAgent,
  },
  server: {
    host: '0.0.0.0',
    apiRoutes: [
      {
        path: '/api/inngest',               // API endpoint for Inngest to send events to
        method: 'ALL',
        createHandler: async ({ mastra }) => inngestServe({ mastra, inngest }),
      },
    ],
  },
  logger: createLogger({
    name: 'Mastra',
    level: 'info',
  }),
})

import { mastra } from './'
import { serve } from '@hono/node-server'
import { createHonoServer } from '@mastra/deployer/server'
 
 
const app = await createHonoServer(mastra)
 
// Start the server on port 3000 so Inngest can send events to it
const srv = serve({
    fetch: app.fetch,
    port: 3000,
})
 
const workflow = mastra.vnext_getWorkflow('activityPlanningWorkflow')
const run = workflow.createRun({})
 
// Start the workflow with the required input data (city name)
// This will trigger the workflow steps and stream the result to the console
const result = await run.start({ inputData: { city: 'New York' } })
console.dir(result, { depth: null })
 
// Close the server after the workflow run is complete
srv.close()