terraform/lang/functions.go

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package lang
import (
"fmt"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/function"
"github.com/zclconf/go-cty/cty/function/stdlib"
"github.com/hashicorp/terraform/lang/funcs"
)
var impureFunctions = []string{
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"bcrypt",
"timestamp",
"uuid",
}
// Functions returns the set of functions that should be used to when evaluating
// expressions in the receiving scope.
func (s *Scope) Functions() map[string]function.Function {
s.funcsLock.Lock()
if s.funcs == nil {
// Some of our functions are just directly the cty stdlib functions.
// Others are implemented in the subdirectory "funcs" here in this
// repository. New functions should generally start out their lives
// in the "funcs" directory and potentially graduate to cty stdlib
// later if the functionality seems to be something domain-agnostic
// that would be useful to all applications using cty functions.
s.funcs = map[string]function.Function{
"abs": stdlib.AbsoluteFunc,
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"basename": funcs.BasenameFunc,
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"base64decode": funcs.Base64DecodeFunc,
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"base64encode": funcs.Base64EncodeFunc,
"base64gzip": funcs.Base64GzipFunc,
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"base64sha256": funcs.Base64Sha256Func,
"base64sha512": funcs.Base64Sha512Func,
"bcrypt": funcs.BcryptFunc,
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"ceil": funcs.CeilFunc,
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"chomp": funcs.ChompFunc,
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"cidrhost": funcs.CidrHostFunc,
"cidrnetmask": funcs.CidrNetmaskFunc,
"cidrsubnet": funcs.CidrSubnetFunc,
"coalesce": stdlib.CoalesceFunc,
"coalescelist": unimplFunc, // TODO
"compact": unimplFunc, // TODO
"concat": stdlib.ConcatFunc,
"contains": unimplFunc, // TODO
"csvdecode": stdlib.CSVDecodeFunc,
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"dirname": funcs.DirnameFunc,
"distinct": unimplFunc, // TODO
"element": funcs.ElementFunc,
"chunklist": unimplFunc, // TODO
"file": funcs.MakeFileFunc(s.BaseDir, false),
"filebase64": funcs.MakeFileFunc(s.BaseDir, true),
"matchkeys": unimplFunc, // TODO
"flatten": unimplFunc, // TODO
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"floor": funcs.FloorFunc,
"format": stdlib.FormatFunc,
"formatlist": stdlib.FormatListFunc,
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"indent": funcs.IndentFunc,
"index": unimplFunc, // TODO
"join": funcs.JoinFunc,
"jsondecode": stdlib.JSONDecodeFunc,
"jsonencode": stdlib.JSONEncodeFunc,
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"keys": unimplFunc, // TODO
"length": funcs.LengthFunc,
"list": unimplFunc, // TODO
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"log": funcs.LogFunc,
"lookup": unimplFunc, // TODO
"lower": stdlib.LowerFunc,
"map": unimplFunc, // TODO
"max": stdlib.MaxFunc,
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"md5": funcs.Md5Func,
"merge": unimplFunc, // TODO
"min": stdlib.MinFunc,
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"pathexpand": funcs.PathExpandFunc,
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"pow": funcs.PowFunc,
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"replace": funcs.ReplaceFunc,
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"rsadecrypt": funcs.RsaDecryptFunc,
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"sha1": funcs.Sha1Func,
"sha256": funcs.Sha256Func,
"sha512": funcs.Sha512Func,
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"signum": funcs.SignumFunc,
"slice": unimplFunc, // TODO
"sort": funcs.SortFunc,
"split": funcs.SplitFunc,
"substr": stdlib.SubstrFunc,
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"timestamp": funcs.TimestampFunc,
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"timeadd": funcs.TimeAddFunc,
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"title": funcs.TitleFunc,
"transpose": unimplFunc, // TODO
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"trimspace": funcs.TrimSpaceFunc,
"upper": stdlib.UpperFunc,
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"urlencode": funcs.URLEncodeFunc,
"uuid": funcs.UUIDFunc,
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"values": unimplFunc, // TODO
"zipmap": unimplFunc, // TODO
}
if s.PureOnly {
// Force our few impure functions to return unknown so that we
// can defer evaluating them until a later pass.
for _, name := range impureFunctions {
s.funcs[name] = function.Unpredictable(s.funcs[name])
}
}
}
s.funcsLock.Unlock()
return s.funcs
}
var unimplFunc = function.New(&function.Spec{
Type: func([]cty.Value) (cty.Type, error) {
return cty.DynamicPseudoType, fmt.Errorf("function not yet implemented")
},
Impl: func([]cty.Value, cty.Type) (cty.Value, error) {
return cty.DynamicVal, fmt.Errorf("function not yet implemented")
},
})