terraform/backend/remote-state/pg/backend.go

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package pg
import (
"context"
"database/sql"
"fmt"
"github.com/hashicorp/terraform/backend"
"github.com/hashicorp/terraform/helper/schema"
_ "github.com/lib/pq"
)
const (
statesTableName = "states"
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statesIndexName = "states_by_name"
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)
// New creates a new backend for Postgres remote state.
func New() backend.Backend {
s := &schema.Backend{
Schema: map[string]*schema.Schema{
"conn_str": &schema.Schema{
Type: schema.TypeString,
Required: true,
Description: "Postgres connection string; a `postgres://` URL",
},
"schema_name": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Description: "Name of the automatically managed Postgres schema to store state",
Default: "terraform_remote_state",
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},
},
}
result := &Backend{Backend: s}
result.Backend.ConfigureFunc = result.configure
return result
}
type Backend struct {
*schema.Backend
// The fields below are set from configure
db *sql.DB
configData *schema.ResourceData
connStr string
schemaName string
}
func (b *Backend) configure(ctx context.Context) error {
// Grab the resource data
b.configData = schema.FromContextBackendConfig(ctx)
data := b.configData
b.connStr = data.Get("conn_str").(string)
b.schemaName = data.Get("schema_name").(string)
db, err := sql.Open("postgres", b.connStr)
if err != nil {
return err
}
// Prepare database schema, tables, & indexes.
var query string
query = `CREATE SCHEMA IF NOT EXISTS %s`
if _, err := db.Query(fmt.Sprintf(query, b.schemaName)); err != nil {
return err
}
query = `CREATE TABLE IF NOT EXISTS %s.%s (
id SERIAL PRIMARY KEY,
name TEXT,
data TEXT
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)`
if _, err := db.Query(fmt.Sprintf(query, b.schemaName, statesTableName)); err != nil {
return err
}
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query = `CREATE UNIQUE INDEX IF NOT EXISTS %s ON %s.%s (name)`
if _, err := db.Query(fmt.Sprintf(query, statesIndexName, b.schemaName, statesTableName)); err != nil {
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return err
}
// Assign db after its schema is prepared.
b.db = db
return nil
}