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README.md

Simple Examples

This directory contains multiple simple example workflows (and whales!), along with the required functions. The intention of each workflow is to show-off and explain a concept in Fission Workflows

Setup

  • Make sure that you have a running Fission Cluster with the workflow engine, see the readme for details.
  • Deploy both the functions, using the deploy.sh script, or run the commands listed there manually.

Examples

Echowhale

The echowhale workflow is a minimal workflow, consisting of whale echoing the input. The main feature it shows is that a workflow from the user's view the same as a Fission function.

Run:

curl -XPOST -d 'Whale you echo?' ${FISSION_ROUTER}/fission-function/echowhale

Fortunewhale

The fortunewhale workflow consists of multiple steps, generating a 'fortune' and passing it through the whalesay function that was used in the first workflow. The features introduced in this example:

  • Dependencies between tasks
  • Mapping a task's output to another task's input
  • The 'noop' internal function, which is a function executed within the engine itself.

Run:

curl -XPOST ${FISSION_ROUTER}/fission-function/fortunewhale

Maybewhale

The maybewhale workflow consists of a simple if-else condition. Depending on the length of the input, the workflow transforms the input. If the input is smaller than 20 characters, the workflow will run the whalesay task. If not, it will simply propagate the user input.

Run:

# This will wrap the input in a whale, because the input is < 20
curl -XPOST -d 'Whale you echo?' ${FISSION_ROUTER}/fission-function/maybewhale

# This will simply echo the input, because the input is >= 20.
curl -XPOST -d 'Whale you echo this way too long message?' ${FISSION_ROUTER}/fission-function/maybewhale

Metadatawhale

The metadatawhale workflow shows how to add metadata (headers, query values) to tasks.

Run:

curl -XPOST ${FISSION_ROUTER}/fission-function/metadatawhale

Nestedwhale

The nestedwhale workflow is surprisingly... empty. The principle that 'workflows are fission functions', allows workflows to call other workflows just like you would call regular Fission Functions. In this workflow, we generate a fortune and pass it to the dedicated whale echoing workflow: echowhale.

Run

curl -XPOST ${FISSION_ROUTER}/fission-function/nestedwhale