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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{
"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,
"basename": funcs.BasenameFunc,
"base64decode": funcs.Base64DecodeFunc,
"base64encode": funcs.Base64EncodeFunc,
"base64gzip": funcs.Base64GzipFunc,
"base64sha256": funcs.Base64Sha256Func,
"base64sha512": funcs.Base64Sha512Func,
"bcrypt": funcs.BcryptFunc,
"ceil": funcs.CeilFunc,
"chomp": funcs.ChompFunc,
"cidrhost": funcs.CidrHostFunc,
"cidrnetmask": funcs.CidrNetmaskFunc,
"cidrsubnet": funcs.CidrSubnetFunc,
"coalesce": funcs.CoalesceFunc,
"coalescelist": funcs.CoalesceListFunc,
"compact": funcs.CompactFunc,
"concat": stdlib.ConcatFunc,
"contains": funcs.ContainsFunc,
"csvdecode": stdlib.CSVDecodeFunc,
"dirname": funcs.DirnameFunc,
"distinct": funcs.DistinctFunc,
"element": funcs.ElementFunc,
"chunklist": funcs.ChunklistFunc,
"file": funcs.MakeFileFunc(s.BaseDir, false),
"fileexists": funcs.MakeFileExistsFunc(s.BaseDir),
"filebase64": funcs.MakeFileFunc(s.BaseDir, true),
"filebase64sha256": funcs.MakeFileBase64Sha256Func(s.BaseDir),
"filebase64sha512": funcs.MakeFileBase64Sha512Func(s.BaseDir),
"filemd5": funcs.MakeFileMd5Func(s.BaseDir),
"filesha1": funcs.MakeFileSha1Func(s.BaseDir),
"filesha256": funcs.MakeFileSha256Func(s.BaseDir),
"filesha512": funcs.MakeFileSha512Func(s.BaseDir),
"flatten": funcs.FlattenFunc,
"floor": funcs.FloorFunc,
"format": stdlib.FormatFunc,
"formatdate": stdlib.FormatDateFunc,
"formatlist": stdlib.FormatListFunc,
"indent": funcs.IndentFunc,
"index": funcs.IndexFunc,
"join": funcs.JoinFunc,
"jsondecode": stdlib.JSONDecodeFunc,
"jsonencode": stdlib.JSONEncodeFunc,
"keys": funcs.KeysFunc,
"length": funcs.LengthFunc,
"list": funcs.ListFunc,
"log": funcs.LogFunc,
"lookup": funcs.LookupFunc,
"lower": stdlib.LowerFunc,
"map": funcs.MapFunc,
"matchkeys": funcs.MatchkeysFunc,
"max": stdlib.MaxFunc,
"md5": funcs.Md5Func,
"merge": funcs.MergeFunc,
"min": stdlib.MinFunc,
"pathexpand": funcs.PathExpandFunc,
"pow": funcs.PowFunc,
"replace": funcs.ReplaceFunc,
"reverse": funcs.ReverseFunc,
"rsadecrypt": funcs.RsaDecryptFunc,
"setintersection": stdlib.SetIntersectionFunc,
"setproduct": funcs.SetProductFunc,
"setunion": stdlib.SetUnionFunc,
"sha1": funcs.Sha1Func,
"sha256": funcs.Sha256Func,
"sha512": funcs.Sha512Func,
"signum": funcs.SignumFunc,
"slice": funcs.SliceFunc,
"sort": funcs.SortFunc,
"split": funcs.SplitFunc,
"strrev": stdlib.ReverseFunc,
"substr": stdlib.SubstrFunc,
"timestamp": funcs.TimestampFunc,
"timeadd": funcs.TimeAddFunc,
"title": funcs.TitleFunc,
"tostring": funcs.MakeToFunc(cty.String),
"tonumber": funcs.MakeToFunc(cty.Number),
"tobool": funcs.MakeToFunc(cty.Bool),
"toset": funcs.MakeToFunc(cty.Set(cty.DynamicPseudoType)),
"tolist": funcs.MakeToFunc(cty.List(cty.DynamicPseudoType)),
"tomap": funcs.MakeToFunc(cty.Map(cty.DynamicPseudoType)),
"transpose": funcs.TransposeFunc,
"trimspace": funcs.TrimSpaceFunc,
"upper": stdlib.UpperFunc,
"urlencode": funcs.URLEncodeFunc,
"uuid": funcs.UUIDFunc,
"values": funcs.ValuesFunc,
"zipmap": funcs.ZipmapFunc,
}
s.funcs["templatefile"] = funcs.MakeTemplateFileFunc(s.BaseDir, func() map[string]function.Function {
// The templatefile function prevents recursive calls to itself
// by copying this map and overwriting the "templatefile" entry.
return s.funcs
})
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")
},
})
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