Reference

Tera functions and filters added by Rescile, including CIDR helpers, JMESPath, HMAC signing, and base64 encoding.

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Tera Function & Filter Reference

Rescile extends the standard Tera templating engine with custom logic for infrastructure modeling.

Functions

  • counter(key="string"): Returns a stateful incrementing integer for a given unique key string.
  • calculate_cidr(ips=[...]): Returns the smallest subnet CIDR containing the array of IP addresses.
  • allocate_subnets(cidr="string", host_map={...}): Returns a JSON object mapping subnet names to calculated non-overlapping CIDR blocks.

Filters

  • cidr_nth_subnet(prefix=int, nth=int): Extracts a specific zero-indexed subnet from a parent block.
  • cidr_split_n(n=int): Splits a CIDR into n equal subnets (rounded to power of two).
  • jmespath(query="string"): Executes a JMESPath query against a JSON structure.
  • select(from="string", match="key=value"): Filters an array of objects and extracts a specific property.
  • intersect(with=[...]): Returns common elements between two arrays.
  • sha256: Computes the SHA-256 hash (hex) of a string or JSON-serialized object.
  • base64_encode: Base64 encodes a string or JSON-serialized object.
  • hmac_sha256(key="secret", encoding="hex"|"base64"): Computes HMAC-SHA256 signature.