Smart Contract: WeatherForecastAtLocation

[AndreasKrueger]

Smart Contract: WeatherForecastAtLocation

Code:

Novel smart contract solution for Ethereum based platforms, here: SOIL.   
On-chain delivery of weather forecasts, for any mapped location on Earth.

User-paid request selects location - an oracle answers to that event.
Then 1 nowcast, and 4 forecasts can be read by anyone, for 4 days.

In the following posts, I am going to present more about this project, step-by-step.
Reposts from the SOIL thread, to keep everything about this big project in one place.

Is this your first interaction with a real, live, non-financial SMART CONTRACT ever?
Let us together learn what we can about the "world computer". Exciting times ...

• post 1: Introduction
• post 2
• post 3
• post 4

[AndreasKrueger]

Text01: Introduction

TOC:
        Why Weather?
        Ecologically oriented "smart contracts" - why weather?
        How to make blockchains aware of the real world, and: a warning!
        Oracles
        Oracle contract: "WeatherForecastAtLocation"
        Nowcasting
        Money talks
        You're next
        Components


Read it in HTML, or PDF: view or download.

Please give feedback. Thanks.

[AndreasKrueger]

Manual02: Prepare your system

• Windows vs Linux, VPS
• Install Soil
• Clone/download repo
• Correct folder
• Add peers
• What is the JavaScript console, with examples
• Languages: Solidity + JavaScript/Python
• Python via RPC, with examples & gsoil-starterscripts (BAT / sh)

https://github.com/drandreaskrueger/weathercontract_user/blob/master/manual/manual02-preparations.md

Please tell me if you run into any problems.

[AndreasKrueger]

Manual03: HyperQuick-Start

Start gsoil & gsoil console. Load scripts:

Code:

gsoil
gsoil attach

loadScript('useful/addpeers.js')
loadScript("contract/contract.js")
loadScript("contract/tools.js")

TOP UP LOCATION --> wait your and oracle's TX --> ASK FORECAST

Code:

city =   "q=Nanjing,China"
getForecast_message(city)

PRICE
tx = topUpLocation(city, 3); txReceipt = waitForTxReceipt(tx)

admin.sleepBlocks(1); getForecast_message(city)

getForecast(city)
getForecast(city, timestamp_now_plus_hours(24))
getForecast(city, timestamp_now_plus_hours(24 * 3.5))

getForecast_message(city, timestamp_now_plus_hours(24 * 4.5))

Step-by-step explanations in the quickstart manual.

[AndreasKrueger]

Summary

• Contract ( v0.5.9 ) is deployed, at address 0x0c5c4bc449808eee712b1d0858e2b12e71410c8e
• Oracle eventlogloop is listening to its events, and uploads weather data whenever a location is "topped up"
• and it updates the forecasts every 24 hours, as long as there is a positive locationBalance
• Contract ABI is published as contract.js for easy import into console.
• Contract tools.js help you to interact with it, on the JavaScript console  gsoil attach.
• and most importantly:
  
  YOU CAN TRY OUT THE QUICKSTART MANUAL NOW.
  
  

Perhaps this is even your first interaction with a real, live, working, innovative SMART CONTRACT ever?  Exciting times ...

I have fully tested the preparations and the quickstart manual on a fresh droplet, but please report any issue.


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