crypto-prices

crypto-prices

Sequence that keeps printing current crypto prices for a provided pair of currencies every 3 seconds.

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📽️ There is video that illustrates the execution of the sample is on our YouTube channel How to check cryptocurrency prices using Scramjet?. Give a 👍 if you liked it and "Subscribe" to the channel to keep up to date with new videos.

Running

❗ Remember to setup transform-hub locally or use the platform's environment for the sequence deployment.

Open the terminal and run the following commands:

# go to 'crypto-prices' directory
cd typescript/crypto-prices

# install dependencies
npm install

# transpile TS->JS and copy node_modules and package.json to dist/
npm run build

# deploy the Sequence from the dist/ directory, which contains transpiled code, package.json and node_modules
si seq deploy dist

# see the Instance output
si inst output -

💡NOTE: Command deploy performs three actions at once: pack, send and start the Sequence. It is the same as if you would run those three commands separately:

si seq pack dist/ -o crypto-prices.tar.gz    # compress 'dist/' directory into file named 'crypto-prices.tar.gz'

si seq send crypto-prices.tar.gz    # send packed Sequence to STH, this will output Sequence ID

si seq start -    # start the Sequence, this will output Instance ID

Start with params

# run another Sequence by passing in arguments, any pair [cryptocurrency, currency]
$ si seq start - --args [\"ETH\",\"PLN\"]

# or similar with deploy
si seq deploy dist --args [\"ETH\",\"PLN\"]

Output

Once you run si inst output - command you should get an output similar to this one:

"{\"data\":{\"base\":\"BTC\",\"currency\":\"USD\",\"amount\":\"40989.61\"}}\r\n"
"{\"data\":{\"base\":\"BTC\",\"currency\":\"USD\",\"amount\":\"40989.61\"}}\r\n"
"{\"data\":{\"base\":\"BTC\",\"currency\":\"USD\",\"amount\":\"40989.61\"}}\r\n"
"{\"data\":{\"base\":\"BTC\",\"currency\":\"USD\",\"amount\":\"40989.61\"}}\r\n"
"{\"data\":{\"base\":\"BTC\",\"currency\":\"USD\",\"amount\":\"40989.61\"}}\r\n"
"{\"data\":{\"base\":\"BTC\",\"currency\":\"USD\",\"amount\":\"40989.61\"}}\r\n"
"{\"data\":{\"base\":\"BTC\",\"currency\":\"USD\",\"amount\":\"40989.61\"}}\r\n"
"{\"data\":{\"base\":\"BTC\",\"currency\":\"USD\",\"amount\":\"40989.61\"}}\r\n"
"{\"data\":{\"base\":\"BTC\",\"currency\":\"USD\",\"amount\":\"40989.61\"}}\r\n"