cfn-language-discussion
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aws-cloudformation
New Function Request Fn::Generate
enhancement request to develop some new functions that generate values, they may be static and are never changed once created or they may be dynamic and are updated on each cloud formation stack update.
This will remove the need to the create of custom resources and the complicity of developing and macros.
/// generates UUID when resource is created.
{ "Fn::Generate" : [ "UUID", "Static" ] }
/// generates UUID when resource is created and will generate a new value on update.
{ "Fn::Generate" : [ "UUID", "Dynamic" ] }
/// generates Unix timestamp when resource is created.
{ "Fn::Generate" : [ "Timestamp", "Static" ] }
/// generates Unix timestamp when resource is created and will generate a new value on update.
{ "Fn::Generate" : [ "Timestamp", "Dynamic" ] }
/// generates random text value of the length 12 when resource is created.
{ "Fn::Generate" : [ "RandomText", "Static" ] }
/// generates random text value of the length 12 when resource is created and will generate a new value on update.
{ "Fn::Generate" : [ "RandomText", "Dynamic" ] }
/// generates random number value of the length 12 when resource is created.
{ "Fn::Generate" : [ "RandomNumber", "Dynamic" ] }
/// generates random number value of the length 12 when resource is created and will generate a new value on update.
{ "Fn::Generate" : [ "RandomNumber", "Static" ] }
I love this idea.
Instead of "Static" and "Dynamic", maybe we can have the concept of passing a seed value to it?
If you don't provide a seed, then it's considered Dynanic and will be a truly random (at least for UUID, RandomText, RandomNumber, it wouldn't apply to Timestamp).
If you provide a seed, that seed is used to generate the value such that if the seed doesn't change, the value doesn't either.
Bonus points if I can specify the min/max values for the numbers, and the allowed characters for the RandomText.
sounds good to me, lets keep getting this up voted !
On Fri, 2 Aug 2019 at 14:52, Rich Acosta [email protected] wrote:
I love this idea.
Instead of "Static" and "Dynamic", maybe we can have the concept of passing a seed value to it?
If you don't provide a seed, then it's considered Dynanic and will be a truly random (at least for UUID, RandomText, RandomNumber, it wouldn't apply to Timestamp).
If you provide a seed, that seed is used to generate the value such that if the seed doesn't change, the value doesn't either.
Bonus points if I can specify the min/max values for the numbers, and the allowed characters for the RandomText.
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I think "Static" and "Dynamic" are good, as they don't rely on the user providing unique values and differentiate between always changing and staying the same. Then "Static" can by default use CloudFormation-provided randomness, but optionally take a seed.
