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added loader implementation for AWS S3, fixes #49
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| package loader | ||
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||
| import ( | ||
| "bytes" | ||
| "crypto/sha256" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "strings" | ||
|
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| "github.com/aws/aws-sdk-go/aws" | ||
| "github.com/aws/aws-sdk-go/aws/session" | ||
| "github.com/aws/aws-sdk-go/service/s3" | ||
| "github.com/aws/aws-sdk-go/service/s3/s3iface" | ||
| "github.com/lukaszbudnik/migrator/types" | ||
| ) | ||
|
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| // s3Loader is struct used for implementing Loader interface for loading migrations from AWS S3 | ||
| type s3Loader struct { | ||
| baseLoader | ||
| } | ||
|
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| // GetSourceMigrations returns all migrations from AWS S3 location | ||
| func (s3l *s3Loader) GetSourceMigrations() []types.Migration { | ||
| sess, err := session.NewSession() | ||
| if err != nil { | ||
| panic(err.Error()) | ||
| } | ||
| client := s3.New(sess) | ||
| return s3l.doGetSourceMigrations(client) | ||
| } | ||
|
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| func (s3l *s3Loader) doGetSourceMigrations(client s3iface.S3API) []types.Migration { | ||
| migrations := []types.Migration{} | ||
|
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| singleMigrationsObjects := s3l.getObjectList(client, s3l.config.SingleMigrations) | ||
| tenantMigrationsObjects := s3l.getObjectList(client, s3l.config.TenantMigrations) | ||
| singleScriptsObjects := s3l.getObjectList(client, s3l.config.SingleScripts) | ||
| tenantScriptsObjects := s3l.getObjectList(client, s3l.config.TenantScripts) | ||
|
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| migrationsMap := make(map[string][]types.Migration) | ||
| s3l.getObjects(client, migrationsMap, singleMigrationsObjects, types.MigrationTypeSingleMigration) | ||
| s3l.getObjects(client, migrationsMap, tenantMigrationsObjects, types.MigrationTypeTenantMigration) | ||
| s3l.sortMigrations(migrationsMap, &migrations) | ||
|
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| migrationsMap = make(map[string][]types.Migration) | ||
| s3l.getObjects(client, migrationsMap, singleScriptsObjects, types.MigrationTypeSingleScript) | ||
| s3l.sortMigrations(migrationsMap, &migrations) | ||
|
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| migrationsMap = make(map[string][]types.Migration) | ||
| s3l.getObjects(client, migrationsMap, tenantScriptsObjects, types.MigrationTypeTenantScript) | ||
| s3l.sortMigrations(migrationsMap, &migrations) | ||
|
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| return migrations | ||
| } | ||
|
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| func (s3l *s3Loader) getObjectList(client s3iface.S3API, prefixes []string) []*string { | ||
| objects := []*string{} | ||
|
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| bucket := strings.Replace(s3l.config.BaseDir, "s3://", "", 1) | ||
|
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| for _, prefix := range prefixes { | ||
|
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| input := &s3.ListObjectsV2Input{ | ||
| Bucket: aws.String(bucket), | ||
| Prefix: aws.String(prefix), | ||
| MaxKeys: aws.Int64(1000), | ||
| } | ||
|
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| pageNum := 0 | ||
| err := client.ListObjectsV2Pages(input, | ||
| func(page *s3.ListObjectsV2Output, lastPage bool) bool { | ||
| pageNum++ | ||
| for _, o := range page.Contents { | ||
| objects = append(objects, o.Key) | ||
| } | ||
|
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| return pageNum <= 10 | ||
| }) | ||
|
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| if err != nil { | ||
| panic(err.Error()) | ||
| } | ||
| } | ||
|
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| return objects | ||
| } | ||
|
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| func (s3l *s3Loader) getObjects(client s3iface.S3API, migrationsMap map[string][]types.Migration, objects []*string, migrationType types.MigrationType) { | ||
| bucket := strings.Replace(s3l.config.BaseDir, "s3://", "", 1) | ||
|
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| objectInput := &s3.GetObjectInput{Bucket: aws.String(bucket)} | ||
| for _, o := range objects { | ||
| objectInput.Key = o | ||
| objectOutput, err := client.GetObject(objectInput) | ||
| if err != nil { | ||
| panic(err.Error()) | ||
| } | ||
| buf := new(bytes.Buffer) | ||
| buf.ReadFrom(objectOutput.Body) | ||
| contents := buf.String() | ||
|
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| hasher := sha256.New() | ||
| hasher.Write([]byte(contents)) | ||
| file := fmt.Sprintf("%s/%s", s3l.config.BaseDir, *o) | ||
| from := strings.LastIndex(file, "/") | ||
| sourceDir := file[0:from] | ||
| name := file[from+1:] | ||
| m := types.Migration{Name: name, SourceDir: sourceDir, File: file, MigrationType: migrationType, Contents: string(contents), CheckSum: hex.EncodeToString(hasher.Sum(nil))} | ||
|
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| e, ok := migrationsMap[m.Name] | ||
| if ok { | ||
| e = append(e, m) | ||
| } else { | ||
| e = []types.Migration{m} | ||
| } | ||
| migrationsMap[m.Name] = e | ||
|
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| } | ||
| } |
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