WIP BigQuery target

sql_runner/bigquery_target.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"fmt"
+	"google.golang.org/api/option"
+	"log"
+
+	// Imports the Google Cloud BigQuery client package.
+	bq "cloud.google.com/go/bigquery"
+	"golang.org/x/net/context"
+	"golang.org/x/oauth2/google"
+)
+
+type BigQueryTarget struct {
+	Target
+	Client *bq.Client
+}
+
+func (bqt BigQueryTarget) IsConnectable() bool {
+	ctx := context.Background()
+	client := bqt.Client
+	query := client.Query("SELECT 1") // empty query to test connection
+	it, err := query.Read(ctx)
+	if err !=  nil {
+		log.Printf("Error while performing test query: %v", err)
+		return false
+	}
+	var row []bq.Value
+	itErr := it.Next(&row)
+	if itErr != nil {
+		log.Printf("Error while reading test query results: %v", itErr)
+		return false
+	}
+	return fmt.Sprint(row) == "[1]"
+}
+
+func NewBigQueryTarget(target Target) *BigQueryTarget {
+	projectID := target.Project
+	ctx := context.Background()
+
+	creds, err := google.CredentialsFromJSON(ctx, []byte(target.Credentials), bq.Scope)
+	if err != nil {
+		log.Fatalf("Failed to create client: %v", err)
+	}
+
+	client, err := bq.NewClient(ctx, projectID, option.WithCredentials(creds))
+	if err != nil {
+		log.Fatalf("Failed to create client: %v", err)
+	}
+
+	return &BigQueryTarget{target,client}
+}
+
+func (bqt BigQueryTarget) GetTarget() Target {
+	return bqt.Target
+}
+
+func (bqt BigQueryTarget) RunQuery(query ReadyQuery, dryRun bool, showQueryOutput bool) QueryStatus {
+	var err error = nil
+	ctx := context.Background()
+	if dryRun {
+		if bqt.IsConnectable() {
+			log.Printf("SUCCESS: Able to connect to target database.")
+		} else {
+			log.Printf("ERROR: Cannot connect to target database.")
+		}
+		return QueryStatus{query, query.Path, 0, nil}
+	}
+
+	affected := 0 // TODO are affected rows returned by the client library?
+	q := bqt.Client.Query(query.Script)
+	it, err := q.Read(ctx)
+	if err != nil {
+		log.Printf("ERROR: %s.", err)
+		return QueryStatus{query, query.Path, int(affected), err}
+	}
+	println(it)
+	return QueryStatus{query, query.Path, affected, err}
+}

sql_runner/playbook.go

@@ -21,7 +21,8 @@ type Playbook struct {
 
 type Target struct {
 	Name, Type, Host, Database, Port, Username,
-	Password, Region, Account, Warehouse 		string
+	Password, Region, Account, Warehouse,
+	Project, Credentials                        string
 	Ssl                                         bool
 }
 

sql_runner/run.go

@@ -24,6 +24,7 @@ const (
 	POSTGRES_TYPE   = "postgres"
 	POSTGRESQL_TYPE = "postgresql"
 	SNOWFLAKE_TYPE  = "snowflake"
+	BIGQUERY_TYPE   = "bigquery"
 
 	ERROR_UNSUPPORTED_DB_TYPE = "Database type is unsupported"
 	ERROR_FROM_STEP_NOT_FOUND = "The fromStep argument did not match any available steps"
@@ -260,6 +261,11 @@ func routeAndRun(target Target, readySteps []ReadyStep, targetChan chan TargetSt
 			snfl := NewSnowflakeTarget(tgt)
 			targetChan <- runSteps(snfl, readySteps, dryRun, showQueryOutput)
 		}(target)
+	case BIGQUERY_TYPE:
+		go func(tgt Target) {
+			bq := NewBigQueryTarget(tgt)
+			targetChan <- runSteps(bq, readySteps, dryRun, showQueryOutput)
+		}(target)
 	default:
 		targetChan <- unsupportedDbType(target.Name, target.Type)
 	}