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providers: add template provider #1778
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package main | ||
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import ( | ||
"github.com/hashicorp/terraform/builtin/providers/template" | ||
"github.com/hashicorp/terraform/plugin" | ||
) | ||
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func main() { | ||
plugin.Serve(&plugin.ServeOpts{ | ||
ProviderFunc: template.Provider, | ||
}) | ||
} |
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package template | ||
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import ( | ||
"github.com/hashicorp/terraform/helper/schema" | ||
"github.com/hashicorp/terraform/terraform" | ||
) | ||
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func Provider() terraform.ResourceProvider { | ||
return &schema.Provider{ | ||
ResourcesMap: map[string]*schema.Resource{ | ||
"template_file": resource(), | ||
}, | ||
} | ||
} |
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package template | ||
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import ( | ||
"testing" | ||
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"github.com/hashicorp/terraform/helper/schema" | ||
) | ||
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func TestProvider(t *testing.T) { | ||
if err := Provider().(*schema.Provider).InternalValidate(); err != nil { | ||
t.Fatalf("err: %s", err) | ||
} | ||
} |
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package template | ||
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import ( | ||
"crypto/sha256" | ||
"encoding/hex" | ||
"fmt" | ||
"io/ioutil" | ||
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"github.com/hashicorp/terraform/config" | ||
"github.com/hashicorp/terraform/config/lang" | ||
"github.com/hashicorp/terraform/config/lang/ast" | ||
"github.com/hashicorp/terraform/helper/schema" | ||
) | ||
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func resource() *schema.Resource { | ||
return &schema.Resource{ | ||
Create: Create, | ||
Read: Read, | ||
Update: Update, | ||
Delete: Delete, | ||
Exists: Exists, | ||
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Schema: map[string]*schema.Schema{ | ||
"filename": &schema.Schema{ | ||
Type: schema.TypeString, | ||
Required: true, | ||
Description: "file to read template from", | ||
}, | ||
"vars": &schema.Schema{ | ||
Type: schema.TypeMap, | ||
Optional: true, | ||
Default: make(map[string]interface{}), | ||
Description: "variables to substitute", | ||
}, | ||
"rendered": &schema.Schema{ | ||
Type: schema.TypeString, | ||
Computed: true, | ||
Default: nil, | ||
Description: "rendered template", | ||
}, | ||
}, | ||
} | ||
} | ||
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func Create(d *schema.ResourceData, meta interface{}) error { return eval(d) } | ||
func Update(d *schema.ResourceData, meta interface{}) error { return eval(d) } | ||
func Read(d *schema.ResourceData, meta interface{}) error { return nil } | ||
func Delete(d *schema.ResourceData, meta interface{}) error { | ||
d.SetId("") | ||
return nil | ||
} | ||
func Exists(d *schema.ResourceData, meta interface{}) (bool, error) { | ||
// Reload every time in case something has changed. | ||
// This should be cheap, and cache invalidation is hard. | ||
return false, nil | ||
} | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. You can just omit There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Oh nevermind - didn't see that There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Hey @josharian - working on #1866 and coming back around to this. I think we need to rework the lifecycle a bit here. Will follow up with a PR. There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Ok. Sorry about that. Let me know if you'd like me to dive in. (Sounds from your comment like you have it under control.) |
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func eval(d *schema.ResourceData) error { | ||
filename := d.Get("filename").(string) | ||
vars := d.Get("vars").(map[string]interface{}) | ||
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buf, err := ioutil.ReadFile(filename) | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Can you do a homedir expand on this? There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Will do. I'll address all commentary in a follow-up commit. If you like, I'll squash everything at the end, so we have a clean history. There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Sounds good! I'm a big git-spelunker so I'm pro-squash. But generally we're pretty flexible. |
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if err != nil { | ||
return err | ||
} | ||
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rendered, err := execute(string(buf), vars) | ||
if err != nil { | ||
return fmt.Errorf("failed to render %v: %v", filename, err) | ||
} | ||
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d.Set("rendered", rendered) | ||
d.SetId(hash(rendered)) | ||
return nil | ||
} | ||
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// execute parses and executes a template using vars. | ||
func execute(s string, vars map[string]interface{}) (string, error) { | ||
root, err := lang.Parse(s) | ||
if err != nil { | ||
return "", err | ||
} | ||
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varmap := make(map[string]ast.Variable) | ||
for k, v := range vars { | ||
// As far as I can tell, v is always a string. | ||
// If it's not, tell the user gracefully. | ||
s, ok := v.(string) | ||
if !ok { | ||
return "", fmt.Errorf("unexpected type for variable %q: %T", k, v) | ||
} | ||
varmap[k] = ast.Variable{ | ||
Value: s, | ||
Type: ast.TypeString, | ||
} | ||
} | ||
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cfg := lang.EvalConfig{ | ||
GlobalScope: &ast.BasicScope{ | ||
VarMap: varmap, | ||
FuncMap: config.Funcs, | ||
}, | ||
} | ||
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out, typ, err := lang.Eval(root, &cfg) | ||
if err != nil { | ||
return "", err | ||
} | ||
if typ != ast.TypeString { | ||
return "", fmt.Errorf("unexpected output ast.Type: %v", typ) | ||
} | ||
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return out.(string), nil | ||
} | ||
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func hash(s string) string { | ||
sha := sha256.Sum256([]byte(s)) | ||
return hex.EncodeToString(sha[:])[:20] | ||
} |
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No need to call out
Default
here - it's alreadynil
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Ack.