rot13

= rot13

[horizontal]
*Invoker*:: go
*Function*:: link:rot13.go[rot13.go]
*Input*:: secrets

=== prerequisites

1. riff is deployed
2. the `riff` CLI is on your PATH
3. the go invoker is installed

    riff invokers apply -f https://github.com/projectriff/go-function-invoker/raw/master/go-invoker.yaml

4. the working directory is `samples/rot13`

=== compile the Go code and build the .so file
This compiles the source `*.go` file as a go https://golang.org/pkg/plugin/[plugin].

[NOTE]
====
This is done in a container, using linux, because cross-compiling go plugins is hard. But in a nutshell, it does this
[source, bash]
----
go build -buildmode=plugin -o rot13.so rot13.go
----
====

[source, bash]
----
make rot13.so
----

=== create the function and its input topic

[source, bash]
----
riff create go --input secrets --artifact rot13.so --handler Encode
----

=== publish a message and wait for a reply

In a terminal window:
[source, bash]
----
riff publish --input secrets --data "Hello World" --reply
----

you get
[source, bash]
----
Svool Dliow
----

Pass that to the function again and you get `Hello World` back.
[source, bash]
----
riff publish --input secrets --data "Svool Dliow" --reply
----


=== delete the function and its input topic

[source, bash]
----
riff delete --all
----