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data_source.go
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/
data_source.go
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package external
import (
"bytes"
"encoding/json"
"fmt"
"os/exec"
"github.com/hashicorp/terraform/helper/schema"
)
func dataSource() *schema.Resource {
return &schema.Resource{
Read: dataSourceRead,
Schema: map[string]*schema.Schema{
"program": &schema.Schema{
Type: schema.TypeList,
Required: true,
Elem: &schema.Schema{
Type: schema.TypeString,
},
},
"query": &schema.Schema{
Type: schema.TypeMap,
Optional: true,
Elem: &schema.Schema{
Type: schema.TypeString,
},
},
"result": &schema.Schema{
Type: schema.TypeMap,
Computed: true,
Elem: &schema.Schema{
Type: schema.TypeString,
},
},
},
}
}
func dataSourceRead(d *schema.ResourceData, meta interface{}) error {
programI := d.Get("program").([]interface{})
query := d.Get("query").(map[string]interface{})
// This would be a ValidateFunc if helper/schema allowed these
// to be applied to lists.
if err := validateProgramAttr(programI); err != nil {
return err
}
program := make([]string, len(programI))
for i, vI := range programI {
program[i] = vI.(string)
}
cmd := exec.Command(program[0], program[1:]...)
queryJson, err := json.Marshal(query)
if err != nil {
// Should never happen, since we know query will always be a map
// from string to string, as guaranteed by d.Get and our schema.
return err
}
cmd.Stdin = bytes.NewReader(queryJson)
resultJson, err := cmd.Output()
if err != nil {
if exitErr, ok := err.(*exec.ExitError); ok {
if exitErr.Stderr != nil && len(exitErr.Stderr) > 0 {
return fmt.Errorf("failed to execute %q: %s", program[0], string(exitErr.Stderr))
}
return fmt.Errorf("command %q failed with no error message", program[0])
} else {
return fmt.Errorf("failed to execute %q: %s", program[0], err)
}
}
result := map[string]string{}
err = json.Unmarshal(resultJson, &result)
if err != nil {
return fmt.Errorf("command %q produced invalid JSON: %s", program[0], err)
}
d.Set("result", result)
d.SetId("-")
return nil
}