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dataset.go
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dataset.go
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// Copyright 2015 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package bigquery
import (
"errors"
"fmt"
"time"
"cloud.google.com/go/internal/optional"
"cloud.google.com/go/internal/trace"
"golang.org/x/net/context"
bq "google.golang.org/api/bigquery/v2"
"google.golang.org/api/iterator"
)
// Dataset is a reference to a BigQuery dataset.
type Dataset struct {
ProjectID string
DatasetID string
c *Client
}
// DatasetMetadata contains information about a BigQuery dataset.
type DatasetMetadata struct {
// These fields can be set when creating a dataset.
Name string // The user-friendly name for this dataset.
Description string // The user-friendly description of this dataset.
Location string // The geo location of the dataset.
DefaultTableExpiration time.Duration // The default expiration time for new tables.
Labels map[string]string // User-provided labels.
Access []*AccessEntry // Access permissions.
// These fields are read-only.
CreationTime time.Time
LastModifiedTime time.Time // When the dataset or any of its tables were modified.
FullID string // The full dataset ID in the form projectID:datasetID.
// ETag is the ETag obtained when reading metadata. Pass it to Dataset.Update to
// ensure that the metadata hasn't changed since it was read.
ETag string
}
// DatasetMetadataToUpdate is used when updating a dataset's metadata.
// Only non-nil fields will be updated.
type DatasetMetadataToUpdate struct {
Description optional.String // The user-friendly description of this table.
Name optional.String // The user-friendly name for this dataset.
// DefaultTableExpiration is the the default expiration time for new tables.
// If set to time.Duration(0), new tables never expire.
DefaultTableExpiration optional.Duration
// The entire access list. It is not possible to replace individual entries.
Access []*AccessEntry
labelUpdater
}
// Dataset creates a handle to a BigQuery dataset in the client's project.
func (c *Client) Dataset(id string) *Dataset {
return c.DatasetInProject(c.projectID, id)
}
// DatasetInProject creates a handle to a BigQuery dataset in the specified project.
func (c *Client) DatasetInProject(projectID, datasetID string) *Dataset {
return &Dataset{
ProjectID: projectID,
DatasetID: datasetID,
c: c,
}
}
// Create creates a dataset in the BigQuery service. An error will be returned if the
// dataset already exists. Pass in a DatasetMetadata value to configure the dataset.
func (d *Dataset) Create(ctx context.Context, md *DatasetMetadata) (err error) {
ctx = trace.StartSpan(ctx, "cloud.google.com/go/bigquery.Dataset.Create")
defer func() { trace.EndSpan(ctx, err) }()
ds, err := md.toBQ()
if err != nil {
return err
}
ds.DatasetReference = &bq.DatasetReference{DatasetId: d.DatasetID}
// Use Client.Location as a default.
if ds.Location == "" {
ds.Location = d.c.Location
}
call := d.c.bqs.Datasets.Insert(d.ProjectID, ds).Context(ctx)
setClientHeader(call.Header())
_, err = call.Do()
return err
}
func (dm *DatasetMetadata) toBQ() (*bq.Dataset, error) {
ds := &bq.Dataset{}
if dm == nil {
return ds, nil
}
ds.FriendlyName = dm.Name
ds.Description = dm.Description
ds.Location = dm.Location
ds.DefaultTableExpirationMs = int64(dm.DefaultTableExpiration / time.Millisecond)
ds.Labels = dm.Labels
var err error
ds.Access, err = accessListToBQ(dm.Access)
if err != nil {
return nil, err
}
if !dm.CreationTime.IsZero() {
return nil, errors.New("bigquery: Dataset.CreationTime is not writable")
}
if !dm.LastModifiedTime.IsZero() {
return nil, errors.New("bigquery: Dataset.LastModifiedTime is not writable")
}
if dm.FullID != "" {
return nil, errors.New("bigquery: Dataset.FullID is not writable")
}
if dm.ETag != "" {
return nil, errors.New("bigquery: Dataset.ETag is not writable")
}
return ds, nil
}
func accessListToBQ(a []*AccessEntry) ([]*bq.DatasetAccess, error) {
var q []*bq.DatasetAccess
for _, e := range a {
a, err := e.toBQ()
if err != nil {
return nil, err
}
q = append(q, a)
}
return q, nil
}
// Delete deletes the dataset. Delete will fail if the dataset is not empty.
func (d *Dataset) Delete(ctx context.Context) (err error) {
return d.deleteInternal(ctx, false)
}
// DeleteWithContents deletes the dataset, as well as contained resources.
func (d *Dataset) DeleteWithContents(ctx context.Context) (err error) {
return d.deleteInternal(ctx, true)
}
func (d *Dataset) deleteInternal(ctx context.Context, deleteContents bool) (err error) {
ctx = trace.StartSpan(ctx, "cloud.google.com/go/bigquery.Dataset.Delete")
defer func() { trace.EndSpan(ctx, err) }()
call := d.c.bqs.Datasets.Delete(d.ProjectID, d.DatasetID).Context(ctx).DeleteContents(deleteContents)
setClientHeader(call.Header())
return call.Do()
}
// Metadata fetches the metadata for the dataset.
func (d *Dataset) Metadata(ctx context.Context) (md *DatasetMetadata, err error) {
ctx = trace.StartSpan(ctx, "cloud.google.com/go/bigquery.Dataset.Metadata")
defer func() { trace.EndSpan(ctx, err) }()
call := d.c.bqs.Datasets.Get(d.ProjectID, d.DatasetID).Context(ctx)
setClientHeader(call.Header())
var ds *bq.Dataset
if err := runWithRetry(ctx, func() (err error) {
ds, err = call.Do()
return err
}); err != nil {
return nil, err
}
return bqToDatasetMetadata(ds)
}
func bqToDatasetMetadata(d *bq.Dataset) (*DatasetMetadata, error) {
dm := &DatasetMetadata{
CreationTime: unixMillisToTime(d.CreationTime),
LastModifiedTime: unixMillisToTime(d.LastModifiedTime),
DefaultTableExpiration: time.Duration(d.DefaultTableExpirationMs) * time.Millisecond,
Description: d.Description,
Name: d.FriendlyName,
FullID: d.Id,
Location: d.Location,
Labels: d.Labels,
ETag: d.Etag,
}
for _, a := range d.Access {
e, err := bqToAccessEntry(a, nil)
if err != nil {
return nil, err
}
dm.Access = append(dm.Access, e)
}
return dm, nil
}
// Update modifies specific Dataset metadata fields.
// To perform a read-modify-write that protects against intervening reads,
// set the etag argument to the DatasetMetadata.ETag field from the read.
// Pass the empty string for etag for a "blind write" that will always succeed.
func (d *Dataset) Update(ctx context.Context, dm DatasetMetadataToUpdate, etag string) (md *DatasetMetadata, err error) {
ctx = trace.StartSpan(ctx, "cloud.google.com/go/bigquery.Dataset.Update")
defer func() { trace.EndSpan(ctx, err) }()
ds, err := dm.toBQ()
if err != nil {
return nil, err
}
call := d.c.bqs.Datasets.Patch(d.ProjectID, d.DatasetID, ds).Context(ctx)
setClientHeader(call.Header())
if etag != "" {
call.Header().Set("If-Match", etag)
}
var ds2 *bq.Dataset
if err := runWithRetry(ctx, func() (err error) {
ds2, err = call.Do()
return err
}); err != nil {
return nil, err
}
return bqToDatasetMetadata(ds2)
}
func (dm *DatasetMetadataToUpdate) toBQ() (*bq.Dataset, error) {
ds := &bq.Dataset{}
forceSend := func(field string) {
ds.ForceSendFields = append(ds.ForceSendFields, field)
}
if dm.Description != nil {
ds.Description = optional.ToString(dm.Description)
forceSend("Description")
}
if dm.Name != nil {
ds.FriendlyName = optional.ToString(dm.Name)
forceSend("FriendlyName")
}
if dm.DefaultTableExpiration != nil {
dur := optional.ToDuration(dm.DefaultTableExpiration)
if dur == 0 {
// Send a null to delete the field.
ds.NullFields = append(ds.NullFields, "DefaultTableExpirationMs")
} else {
ds.DefaultTableExpirationMs = int64(dur / time.Millisecond)
}
}
if dm.Access != nil {
var err error
ds.Access, err = accessListToBQ(dm.Access)
if err != nil {
return nil, err
}
if len(ds.Access) == 0 {
ds.NullFields = append(ds.NullFields, "Access")
}
}
labels, forces, nulls := dm.update()
ds.Labels = labels
ds.ForceSendFields = append(ds.ForceSendFields, forces...)
ds.NullFields = append(ds.NullFields, nulls...)
return ds, nil
}
// Table creates a handle to a BigQuery table in the dataset.
// To determine if a table exists, call Table.Metadata.
// If the table does not already exist, use Table.Create to create it.
func (d *Dataset) Table(tableID string) *Table {
return &Table{ProjectID: d.ProjectID, DatasetID: d.DatasetID, TableID: tableID, c: d.c}
}
// Tables returns an iterator over the tables in the Dataset.
func (d *Dataset) Tables(ctx context.Context) *TableIterator {
it := &TableIterator{
ctx: ctx,
dataset: d,
}
it.pageInfo, it.nextFunc = iterator.NewPageInfo(
it.fetch,
func() int { return len(it.tables) },
func() interface{} { b := it.tables; it.tables = nil; return b })
return it
}
// A TableIterator is an iterator over Tables.
type TableIterator struct {
ctx context.Context
dataset *Dataset
tables []*Table
pageInfo *iterator.PageInfo
nextFunc func() error
}
// Next returns the next result. Its second return value is Done if there are
// no more results. Once Next returns Done, all subsequent calls will return
// Done.
func (it *TableIterator) Next() (*Table, error) {
if err := it.nextFunc(); err != nil {
return nil, err
}
t := it.tables[0]
it.tables = it.tables[1:]
return t, nil
}
// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *TableIterator) PageInfo() *iterator.PageInfo { return it.pageInfo }
// for testing
var listTables = func(it *TableIterator, pageSize int, pageToken string) (*bq.TableList, error) {
call := it.dataset.c.bqs.Tables.List(it.dataset.ProjectID, it.dataset.DatasetID).
PageToken(pageToken).
Context(it.ctx)
setClientHeader(call.Header())
if pageSize > 0 {
call.MaxResults(int64(pageSize))
}
var res *bq.TableList
err := runWithRetry(it.ctx, func() (err error) {
res, err = call.Do()
return err
})
return res, err
}
func (it *TableIterator) fetch(pageSize int, pageToken string) (string, error) {
res, err := listTables(it, pageSize, pageToken)
if err != nil {
return "", err
}
for _, t := range res.Tables {
it.tables = append(it.tables, bqToTable(t.TableReference, it.dataset.c))
}
return res.NextPageToken, nil
}
func bqToTable(tr *bq.TableReference, c *Client) *Table {
if tr == nil {
return nil
}
return &Table{
ProjectID: tr.ProjectId,
DatasetID: tr.DatasetId,
TableID: tr.TableId,
c: c,
}
}
// Datasets returns an iterator over the datasets in a project.
// The Client's project is used by default, but that can be
// changed by setting ProjectID on the returned iterator before calling Next.
func (c *Client) Datasets(ctx context.Context) *DatasetIterator {
return c.DatasetsInProject(ctx, c.projectID)
}
// DatasetsInProject returns an iterator over the datasets in the provided project.
//
// Deprecated: call Client.Datasets, then set ProjectID on the returned iterator.
func (c *Client) DatasetsInProject(ctx context.Context, projectID string) *DatasetIterator {
it := &DatasetIterator{
ctx: ctx,
c: c,
ProjectID: projectID,
}
it.pageInfo, it.nextFunc = iterator.NewPageInfo(
it.fetch,
func() int { return len(it.items) },
func() interface{} { b := it.items; it.items = nil; return b })
return it
}
// DatasetIterator iterates over the datasets in a project.
type DatasetIterator struct {
// ListHidden causes hidden datasets to be listed when set to true.
// Set before the first call to Next.
ListHidden bool
// Filter restricts the datasets returned by label. The filter syntax is described in
// https://cloud.google.com/bigquery/docs/labeling-datasets#filtering_datasets_using_labels
// Set before the first call to Next.
Filter string
// The project ID of the listed datasets.
// Set before the first call to Next.
ProjectID string
ctx context.Context
c *Client
pageInfo *iterator.PageInfo
nextFunc func() error
items []*Dataset
}
// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *DatasetIterator) PageInfo() *iterator.PageInfo { return it.pageInfo }
func (it *DatasetIterator) Next() (*Dataset, error) {
if err := it.nextFunc(); err != nil {
return nil, err
}
item := it.items[0]
it.items = it.items[1:]
return item, nil
}
// for testing
var listDatasets = func(it *DatasetIterator, pageSize int, pageToken string) (*bq.DatasetList, error) {
call := it.c.bqs.Datasets.List(it.ProjectID).
Context(it.ctx).
PageToken(pageToken).
All(it.ListHidden)
setClientHeader(call.Header())
if pageSize > 0 {
call.MaxResults(int64(pageSize))
}
if it.Filter != "" {
call.Filter(it.Filter)
}
var res *bq.DatasetList
err := runWithRetry(it.ctx, func() (err error) {
res, err = call.Do()
return err
})
return res, err
}
func (it *DatasetIterator) fetch(pageSize int, pageToken string) (string, error) {
res, err := listDatasets(it, pageSize, pageToken)
if err != nil {
return "", err
}
for _, d := range res.Datasets {
it.items = append(it.items, &Dataset{
ProjectID: d.DatasetReference.ProjectId,
DatasetID: d.DatasetReference.DatasetId,
c: it.c,
})
}
return res.NextPageToken, nil
}
// An AccessEntry describes the permissions that an entity has on a dataset.
type AccessEntry struct {
Role AccessRole // The role of the entity
EntityType EntityType // The type of entity
Entity string // The entity (individual or group) granted access
View *Table // The view granted access (EntityType must be ViewEntity)
}
// AccessRole is the level of access to grant to a dataset.
type AccessRole string
const (
OwnerRole AccessRole = "OWNER"
ReaderRole AccessRole = "READER"
WriterRole AccessRole = "WRITER"
)
// EntityType is the type of entity in an AccessEntry.
type EntityType int
const (
// A domain (e.g. "example.com")
DomainEntity EntityType = iota + 1
// Email address of a Google Group
GroupEmailEntity
// Email address of an individual user.
UserEmailEntity
// A special group: one of projectOwners, projectReaders, projectWriters or allAuthenticatedUsers.
SpecialGroupEntity
// A BigQuery view.
ViewEntity
)
func (e *AccessEntry) toBQ() (*bq.DatasetAccess, error) {
q := &bq.DatasetAccess{Role: string(e.Role)}
switch e.EntityType {
case DomainEntity:
q.Domain = e.Entity
case GroupEmailEntity:
q.GroupByEmail = e.Entity
case UserEmailEntity:
q.UserByEmail = e.Entity
case SpecialGroupEntity:
q.SpecialGroup = e.Entity
case ViewEntity:
q.View = e.View.toBQ()
default:
return nil, fmt.Errorf("bigquery: unknown entity type %d", e.EntityType)
}
return q, nil
}
func bqToAccessEntry(q *bq.DatasetAccess, c *Client) (*AccessEntry, error) {
e := &AccessEntry{Role: AccessRole(q.Role)}
switch {
case q.Domain != "":
e.Entity = q.Domain
e.EntityType = DomainEntity
case q.GroupByEmail != "":
e.Entity = q.GroupByEmail
e.EntityType = GroupEmailEntity
case q.UserByEmail != "":
e.Entity = q.UserByEmail
e.EntityType = UserEmailEntity
case q.SpecialGroup != "":
e.Entity = q.SpecialGroup
e.EntityType = SpecialGroupEntity
case q.View != nil:
e.View = c.DatasetInProject(q.View.ProjectId, q.View.DatasetId).Table(q.View.TableId)
e.EntityType = ViewEntity
default:
return nil, errors.New("bigquery: invalid access value")
}
return e, nil
}