github.com/danp/terraform@v0.9.5-0.20170426144147-39d740081351/builtin/providers/terraform/data_source_state.go (about)

     1  package terraform
     2  
     3  import (
     4  	"fmt"
     5  	"log"
     6  	"time"
     7  
     8  	"github.com/hashicorp/terraform/backend"
     9  	backendinit "github.com/hashicorp/terraform/backend/init"
    10  	"github.com/hashicorp/terraform/config"
    11  	"github.com/hashicorp/terraform/helper/schema"
    12  	"github.com/hashicorp/terraform/terraform"
    13  )
    14  
    15  func dataSourceRemoteState() *schema.Resource {
    16  	return &schema.Resource{
    17  		Read: dataSourceRemoteStateRead,
    18  
    19  		Schema: map[string]*schema.Schema{
    20  			"backend": {
    21  				Type:     schema.TypeString,
    22  				Required: true,
    23  				ValidateFunc: func(v interface{}, k string) (ws []string, errors []error) {
    24  					if vStr, ok := v.(string); ok && vStr == "_local" {
    25  						ws = append(ws, "Use of the %q backend is now officially "+
    26  							"supported as %q. Please update your configuration to ensure "+
    27  							"compatibility with future versions of Terraform.",
    28  							"_local", "local")
    29  					}
    30  
    31  					return
    32  				},
    33  			},
    34  
    35  			"config": {
    36  				Type:     schema.TypeMap,
    37  				Optional: true,
    38  			},
    39  
    40  			"environment": {
    41  				Type:     schema.TypeString,
    42  				Optional: true,
    43  				Default:  backend.DefaultStateName,
    44  			},
    45  
    46  			"__has_dynamic_attributes": {
    47  				Type:     schema.TypeString,
    48  				Optional: true,
    49  			},
    50  		},
    51  	}
    52  }
    53  
    54  func dataSourceRemoteStateRead(d *schema.ResourceData, meta interface{}) error {
    55  	backend := d.Get("backend").(string)
    56  
    57  	// Get the configuration in a type we want.
    58  	rawConfig, err := config.NewRawConfig(d.Get("config").(map[string]interface{}))
    59  	if err != nil {
    60  		return fmt.Errorf("error initializing backend: %s", err)
    61  	}
    62  
    63  	// Don't break people using the old _local syntax - but note warning above
    64  	if backend == "_local" {
    65  		log.Println(`[INFO] Switching old (unsupported) backend "_local" to "local"`)
    66  		backend = "local"
    67  	}
    68  
    69  	// Create the client to access our remote state
    70  	log.Printf("[DEBUG] Initializing remote state backend: %s", backend)
    71  	f := backendinit.Backend(backend)
    72  	if f == nil {
    73  		return fmt.Errorf("Unknown backend type: %s", backend)
    74  	}
    75  	b := f()
    76  
    77  	// Configure the backend
    78  	if err := b.Configure(terraform.NewResourceConfig(rawConfig)); err != nil {
    79  		return fmt.Errorf("error initializing backend: %s", err)
    80  	}
    81  
    82  	// Get the state
    83  	env := d.Get("environment").(string)
    84  	state, err := b.State(env)
    85  	if err != nil {
    86  		return fmt.Errorf("error loading the remote state: %s", err)
    87  	}
    88  	if err := state.RefreshState(); err != nil {
    89  		return err
    90  	}
    91  
    92  	d.SetId(time.Now().UTC().String())
    93  
    94  	outputMap := make(map[string]interface{})
    95  
    96  	remoteState := state.State()
    97  	if remoteState.Empty() {
    98  		log.Println("[DEBUG] empty remote state")
    99  		return nil
   100  	}
   101  
   102  	for key, val := range remoteState.RootModule().Outputs {
   103  		outputMap[key] = val.Value
   104  	}
   105  
   106  	mappedOutputs := remoteStateFlatten(outputMap)
   107  
   108  	for key, val := range mappedOutputs {
   109  		d.UnsafeSetFieldRaw(key, val)
   110  	}
   111  	return nil
   112  }