mirror of
https://github.com/restic/restic.git
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Among others, this updates minio-go, so that the new "eu-west-3" zone for AWS is supported.
670 lines
19 KiB
Go
670 lines
19 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package bigquery
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import (
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"errors"
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"fmt"
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"math/rand"
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"os"
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"sync"
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"time"
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"cloud.google.com/go/internal"
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gax "github.com/googleapis/gax-go"
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"golang.org/x/net/context"
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bq "google.golang.org/api/bigquery/v2"
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"google.golang.org/api/googleapi"
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"google.golang.org/api/iterator"
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)
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// A Job represents an operation which has been submitted to BigQuery for processing.
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type Job struct {
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c *Client
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projectID string
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jobID string
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config *bq.JobConfiguration
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lastStatus *JobStatus
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}
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// JobFromID creates a Job which refers to an existing BigQuery job. The job
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// need not have been created by this package. For example, the job may have
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// been created in the BigQuery console.
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func (c *Client) JobFromID(ctx context.Context, id string) (*Job, error) {
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bqjob, err := c.getJobInternal(ctx, id, "configuration", "jobReference", "status", "statistics")
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if err != nil {
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return nil, err
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}
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return bqToJob(bqjob, c)
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}
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// ID returns the job's ID.
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func (j *Job) ID() string {
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return j.jobID
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}
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// State is one of a sequence of states that a Job progresses through as it is processed.
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type State int
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const (
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StateUnspecified State = iota // used only as a default in JobIterator
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Pending
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Running
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Done
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)
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// JobStatus contains the current State of a job, and errors encountered while processing that job.
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type JobStatus struct {
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State State
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err error
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// All errors encountered during the running of the job.
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// Not all Errors are fatal, so errors here do not necessarily mean that the job has completed or was unsuccessful.
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Errors []*Error
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// Statistics about the job.
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Statistics *JobStatistics
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}
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// JobConfig contains configuration information for a job. It is implemented by
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// *CopyConfig, *ExtractConfig, *LoadConfig and *QueryConfig.
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type JobConfig interface {
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isJobConfig()
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}
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func (*CopyConfig) isJobConfig() {}
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func (*ExtractConfig) isJobConfig() {}
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func (*LoadConfig) isJobConfig() {}
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func (*QueryConfig) isJobConfig() {}
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// Config returns the configuration information for j.
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func (j *Job) Config() (JobConfig, error) {
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return bqToJobConfig(j.config, j.c)
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}
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func bqToJobConfig(q *bq.JobConfiguration, c *Client) (JobConfig, error) {
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switch {
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case q == nil:
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return nil, nil
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case q.Copy != nil:
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return bqToCopyConfig(q, c), nil
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case q.Extract != nil:
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return bqToExtractConfig(q, c), nil
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case q.Load != nil:
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return bqToLoadConfig(q, c), nil
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case q.Query != nil:
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return bqToQueryConfig(q, c)
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default:
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return nil, nil
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}
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}
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// JobIDConfig describes how to create an ID for a job.
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type JobIDConfig struct {
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// JobID is the ID to use for the job. If empty, a random job ID will be generated.
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JobID string
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// If AddJobIDSuffix is true, then a random string will be appended to JobID.
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AddJobIDSuffix bool
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}
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// createJobRef creates a JobReference.
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// projectID must be non-empty.
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func (j *JobIDConfig) createJobRef(projectID string) *bq.JobReference {
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// We don't check whether projectID is empty; the server will return an
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// error when it encounters the resulting JobReference.
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jr := &bq.JobReference{ProjectId: projectID}
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if j.JobID == "" {
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jr.JobId = randomIDFn()
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} else if j.AddJobIDSuffix {
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jr.JobId = j.JobID + "-" + randomIDFn()
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} else {
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jr.JobId = j.JobID
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}
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return jr
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}
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const alphanum = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
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var (
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rngMu sync.Mutex
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rng = rand.New(rand.NewSource(time.Now().UnixNano() ^ int64(os.Getpid())))
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)
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// For testing.
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var randomIDFn = randomID
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// As of August 2017, the BigQuery service uses 27 alphanumeric characters for
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// suffixes.
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const randomIDLen = 27
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func randomID() string {
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// This is used for both job IDs and insert IDs.
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var b [randomIDLen]byte
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rngMu.Lock()
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for i := 0; i < len(b); i++ {
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b[i] = alphanum[rng.Intn(len(alphanum))]
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}
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rngMu.Unlock()
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return string(b[:])
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}
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// Done reports whether the job has completed.
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// After Done returns true, the Err method will return an error if the job completed unsuccesfully.
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func (s *JobStatus) Done() bool {
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return s.State == Done
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}
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// Err returns the error that caused the job to complete unsuccesfully (if any).
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func (s *JobStatus) Err() error {
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return s.err
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}
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// Status retrieves the current status of the job from BigQuery. It fails if the Status could not be determined.
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func (j *Job) Status(ctx context.Context) (*JobStatus, error) {
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bqjob, err := j.c.getJobInternal(ctx, j.jobID, "status", "statistics")
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if err != nil {
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return nil, err
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}
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if err := j.setStatus(bqjob.Status); err != nil {
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return nil, err
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}
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j.setStatistics(bqjob.Statistics, j.c)
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return j.lastStatus, nil
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}
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// LastStatus returns the most recently retrieved status of the job. The status is
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// retrieved when a new job is created, or when JobFromID or Job.Status is called.
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// Call Job.Status to get the most up-to-date information about a job.
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func (j *Job) LastStatus() *JobStatus {
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return j.lastStatus
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}
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// Cancel requests that a job be cancelled. This method returns without waiting for
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// cancellation to take effect. To check whether the job has terminated, use Job.Status.
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// Cancelled jobs may still incur costs.
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func (j *Job) Cancel(ctx context.Context) error {
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// Jobs.Cancel returns a job entity, but the only relevant piece of
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// data it may contain (the status of the job) is unreliable. From the
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// docs: "This call will return immediately, and the client will need
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// to poll for the job status to see if the cancel completed
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// successfully". So it would be misleading to return a status.
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call := j.c.bqs.Jobs.Cancel(j.projectID, j.jobID).
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Fields(). // We don't need any of the response data.
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Context(ctx)
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setClientHeader(call.Header())
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return runWithRetry(ctx, func() error {
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_, err := call.Do()
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return err
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})
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}
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// Wait blocks until the job or the context is done. It returns the final status
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// of the job.
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// If an error occurs while retrieving the status, Wait returns that error. But
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// Wait returns nil if the status was retrieved successfully, even if
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// status.Err() != nil. So callers must check both errors. See the example.
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func (j *Job) Wait(ctx context.Context) (*JobStatus, error) {
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if j.isQuery() {
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// We can avoid polling for query jobs.
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if _, err := j.waitForQuery(ctx, j.projectID); err != nil {
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return nil, err
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}
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// Note: extra RPC even if you just want to wait for the query to finish.
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js, err := j.Status(ctx)
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if err != nil {
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return nil, err
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}
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return js, nil
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}
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// Non-query jobs must poll.
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var js *JobStatus
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err := internal.Retry(ctx, gax.Backoff{}, func() (stop bool, err error) {
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js, err = j.Status(ctx)
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if err != nil {
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return true, err
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}
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if js.Done() {
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return true, nil
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}
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return false, nil
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})
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if err != nil {
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return nil, err
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}
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return js, nil
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}
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// Read fetches the results of a query job.
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// If j is not a query job, Read returns an error.
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func (j *Job) Read(ctx context.Context) (*RowIterator, error) {
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return j.read(ctx, j.waitForQuery, fetchPage)
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}
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func (j *Job) read(ctx context.Context, waitForQuery func(context.Context, string) (Schema, error), pf pageFetcher) (*RowIterator, error) {
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if !j.isQuery() {
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return nil, errors.New("bigquery: cannot read from a non-query job")
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}
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destTable := j.config.Query.DestinationTable
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// The destination table should only be nil if there was a query error.
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if destTable == nil {
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return nil, errors.New("bigquery: query job missing destination table")
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}
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projectID := destTable.ProjectId
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schema, err := waitForQuery(ctx, projectID)
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if err != nil {
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return nil, err
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}
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dt := bqToTable(destTable, j.c)
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it := newRowIterator(ctx, dt, pf)
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it.Schema = schema
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return it, nil
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}
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// waitForQuery waits for the query job to complete and returns its schema.
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func (j *Job) waitForQuery(ctx context.Context, projectID string) (Schema, error) {
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// Use GetQueryResults only to wait for completion, not to read results.
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call := j.c.bqs.Jobs.GetQueryResults(projectID, j.jobID).Context(ctx).MaxResults(0)
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setClientHeader(call.Header())
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backoff := gax.Backoff{
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Initial: 1 * time.Second,
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Multiplier: 2,
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Max: 60 * time.Second,
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}
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var res *bq.GetQueryResultsResponse
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err := internal.Retry(ctx, backoff, func() (stop bool, err error) {
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res, err = call.Do()
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if err != nil {
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return !retryableError(err), err
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}
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if !res.JobComplete { // GetQueryResults may return early without error; retry.
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return false, nil
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}
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return true, nil
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})
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if err != nil {
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return nil, err
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}
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return bqToSchema(res.Schema), nil
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}
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// JobStatistics contains statistics about a job.
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type JobStatistics struct {
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CreationTime time.Time
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StartTime time.Time
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EndTime time.Time
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TotalBytesProcessed int64
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Details Statistics
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}
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// Statistics is one of ExtractStatistics, LoadStatistics or QueryStatistics.
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type Statistics interface {
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implementsStatistics()
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}
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// ExtractStatistics contains statistics about an extract job.
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type ExtractStatistics struct {
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// The number of files per destination URI or URI pattern specified in the
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// extract configuration. These values will be in the same order as the
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// URIs specified in the 'destinationUris' field.
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DestinationURIFileCounts []int64
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}
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// LoadStatistics contains statistics about a load job.
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type LoadStatistics struct {
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// The number of bytes of source data in a load job.
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InputFileBytes int64
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// The number of source files in a load job.
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InputFiles int64
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// Size of the loaded data in bytes. Note that while a load job is in the
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// running state, this value may change.
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OutputBytes int64
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// The number of rows imported in a load job. Note that while an import job is
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// in the running state, this value may change.
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OutputRows int64
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}
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// QueryStatistics contains statistics about a query job.
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type QueryStatistics struct {
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// Billing tier for the job.
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BillingTier int64
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// Whether the query result was fetched from the query cache.
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CacheHit bool
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// The type of query statement, if valid.
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StatementType string
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// Total bytes billed for the job.
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TotalBytesBilled int64
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// Total bytes processed for the job.
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TotalBytesProcessed int64
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// Describes execution plan for the query.
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QueryPlan []*ExplainQueryStage
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// The number of rows affected by a DML statement. Present only for DML
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// statements INSERT, UPDATE or DELETE.
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NumDMLAffectedRows int64
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// ReferencedTables: [Output-only, Experimental] Referenced tables for
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// the job. Queries that reference more than 50 tables will not have a
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// complete list.
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ReferencedTables []*Table
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// The schema of the results. Present only for successful dry run of
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// non-legacy SQL queries.
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Schema Schema
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// Standard SQL: list of undeclared query parameter names detected during a
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// dry run validation.
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UndeclaredQueryParameterNames []string
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}
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// ExplainQueryStage describes one stage of a query.
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type ExplainQueryStage struct {
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// Relative amount of the total time the average shard spent on CPU-bound tasks.
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ComputeRatioAvg float64
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// Relative amount of the total time the slowest shard spent on CPU-bound tasks.
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ComputeRatioMax float64
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// Unique ID for stage within plan.
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ID int64
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// Human-readable name for stage.
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Name string
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// Relative amount of the total time the average shard spent reading input.
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ReadRatioAvg float64
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// Relative amount of the total time the slowest shard spent reading input.
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ReadRatioMax float64
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// Number of records read into the stage.
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RecordsRead int64
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// Number of records written by the stage.
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RecordsWritten int64
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// Current status for the stage.
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Status string
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// List of operations within the stage in dependency order (approximately
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// chronological).
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Steps []*ExplainQueryStep
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// Relative amount of the total time the average shard spent waiting to be scheduled.
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WaitRatioAvg float64
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// Relative amount of the total time the slowest shard spent waiting to be scheduled.
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WaitRatioMax float64
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// Relative amount of the total time the average shard spent on writing output.
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WriteRatioAvg float64
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// Relative amount of the total time the slowest shard spent on writing output.
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WriteRatioMax float64
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}
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// ExplainQueryStep describes one step of a query stage.
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type ExplainQueryStep struct {
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// Machine-readable operation type.
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Kind string
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// Human-readable stage descriptions.
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Substeps []string
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}
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func (*ExtractStatistics) implementsStatistics() {}
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func (*LoadStatistics) implementsStatistics() {}
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func (*QueryStatistics) implementsStatistics() {}
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// Jobs lists jobs within a project.
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func (c *Client) Jobs(ctx context.Context) *JobIterator {
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it := &JobIterator{
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ctx: ctx,
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c: c,
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ProjectID: c.projectID,
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}
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it.pageInfo, it.nextFunc = iterator.NewPageInfo(
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it.fetch,
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func() int { return len(it.items) },
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func() interface{} { b := it.items; it.items = nil; return b })
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return it
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}
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// JobIterator iterates over jobs in a project.
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type JobIterator struct {
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ProjectID string // Project ID of the jobs to list. Default is the client's project.
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AllUsers bool // Whether to list jobs owned by all users in the project, or just the current caller.
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State State // List only jobs in the given state. Defaults to all states.
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ctx context.Context
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c *Client
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pageInfo *iterator.PageInfo
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nextFunc func() error
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items []*Job
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}
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func (it *JobIterator) PageInfo() *iterator.PageInfo { return it.pageInfo }
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func (it *JobIterator) Next() (*Job, error) {
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if err := it.nextFunc(); err != nil {
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return nil, err
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}
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item := it.items[0]
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it.items = it.items[1:]
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return item, nil
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}
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func (it *JobIterator) fetch(pageSize int, pageToken string) (string, error) {
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var st string
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switch it.State {
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case StateUnspecified:
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st = ""
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case Pending:
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st = "pending"
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case Running:
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st = "running"
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case Done:
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st = "done"
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default:
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return "", fmt.Errorf("bigquery: invalid value for JobIterator.State: %d", it.State)
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}
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req := it.c.bqs.Jobs.List(it.ProjectID).
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Context(it.ctx).
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PageToken(pageToken).
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Projection("full").
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AllUsers(it.AllUsers)
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if st != "" {
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req.StateFilter(st)
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}
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setClientHeader(req.Header())
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if pageSize > 0 {
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req.MaxResults(int64(pageSize))
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}
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res, err := req.Do()
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if err != nil {
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return "", err
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}
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for _, j := range res.Jobs {
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job, err := convertListedJob(j, it.c)
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if err != nil {
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return "", err
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}
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it.items = append(it.items, job)
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}
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return res.NextPageToken, nil
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}
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func convertListedJob(j *bq.JobListJobs, c *Client) (*Job, error) {
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return bqToJob2(j.JobReference, j.Configuration, j.Status, j.Statistics, c)
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}
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func (c *Client) getJobInternal(ctx context.Context, jobID string, fields ...googleapi.Field) (*bq.Job, error) {
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var job *bq.Job
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call := c.bqs.Jobs.Get(c.projectID, jobID).Context(ctx)
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if len(fields) > 0 {
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call = call.Fields(fields...)
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}
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setClientHeader(call.Header())
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err := runWithRetry(ctx, func() (err error) {
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job, err = call.Do()
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return err
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})
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if err != nil {
|
|
return nil, err
|
|
}
|
|
return job, nil
|
|
}
|
|
|
|
func bqToJob(q *bq.Job, c *Client) (*Job, error) {
|
|
return bqToJob2(q.JobReference, q.Configuration, q.Status, q.Statistics, c)
|
|
}
|
|
|
|
func bqToJob2(qr *bq.JobReference, qc *bq.JobConfiguration, qs *bq.JobStatus, qt *bq.JobStatistics, c *Client) (*Job, error) {
|
|
j := &Job{
|
|
projectID: qr.ProjectId,
|
|
jobID: qr.JobId,
|
|
c: c,
|
|
}
|
|
j.setConfig(qc)
|
|
if err := j.setStatus(qs); err != nil {
|
|
return nil, err
|
|
}
|
|
j.setStatistics(qt, c)
|
|
return j, nil
|
|
}
|
|
|
|
func (j *Job) setConfig(config *bq.JobConfiguration) {
|
|
if config == nil {
|
|
return
|
|
}
|
|
j.config = config
|
|
}
|
|
|
|
func (j *Job) isQuery() bool {
|
|
return j.config != nil && j.config.Query != nil
|
|
}
|
|
|
|
var stateMap = map[string]State{"PENDING": Pending, "RUNNING": Running, "DONE": Done}
|
|
|
|
func (j *Job) setStatus(qs *bq.JobStatus) error {
|
|
if qs == nil {
|
|
return nil
|
|
}
|
|
state, ok := stateMap[qs.State]
|
|
if !ok {
|
|
return fmt.Errorf("unexpected job state: %v", qs.State)
|
|
}
|
|
j.lastStatus = &JobStatus{
|
|
State: state,
|
|
err: nil,
|
|
}
|
|
if err := bqToError(qs.ErrorResult); state == Done && err != nil {
|
|
j.lastStatus.err = err
|
|
}
|
|
for _, ep := range qs.Errors {
|
|
j.lastStatus.Errors = append(j.lastStatus.Errors, bqToError(ep))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (j *Job) setStatistics(s *bq.JobStatistics, c *Client) {
|
|
if s == nil || j.lastStatus == nil {
|
|
return
|
|
}
|
|
js := &JobStatistics{
|
|
CreationTime: unixMillisToTime(s.CreationTime),
|
|
StartTime: unixMillisToTime(s.StartTime),
|
|
EndTime: unixMillisToTime(s.EndTime),
|
|
TotalBytesProcessed: s.TotalBytesProcessed,
|
|
}
|
|
switch {
|
|
case s.Extract != nil:
|
|
js.Details = &ExtractStatistics{
|
|
DestinationURIFileCounts: []int64(s.Extract.DestinationUriFileCounts),
|
|
}
|
|
case s.Load != nil:
|
|
js.Details = &LoadStatistics{
|
|
InputFileBytes: s.Load.InputFileBytes,
|
|
InputFiles: s.Load.InputFiles,
|
|
OutputBytes: s.Load.OutputBytes,
|
|
OutputRows: s.Load.OutputRows,
|
|
}
|
|
case s.Query != nil:
|
|
var names []string
|
|
for _, qp := range s.Query.UndeclaredQueryParameters {
|
|
names = append(names, qp.Name)
|
|
}
|
|
var tables []*Table
|
|
for _, tr := range s.Query.ReferencedTables {
|
|
tables = append(tables, bqToTable(tr, c))
|
|
}
|
|
js.Details = &QueryStatistics{
|
|
BillingTier: s.Query.BillingTier,
|
|
CacheHit: s.Query.CacheHit,
|
|
StatementType: s.Query.StatementType,
|
|
TotalBytesBilled: s.Query.TotalBytesBilled,
|
|
TotalBytesProcessed: s.Query.TotalBytesProcessed,
|
|
NumDMLAffectedRows: s.Query.NumDmlAffectedRows,
|
|
QueryPlan: queryPlanFromProto(s.Query.QueryPlan),
|
|
Schema: bqToSchema(s.Query.Schema),
|
|
ReferencedTables: tables,
|
|
UndeclaredQueryParameterNames: names,
|
|
}
|
|
}
|
|
j.lastStatus.Statistics = js
|
|
}
|
|
|
|
func queryPlanFromProto(stages []*bq.ExplainQueryStage) []*ExplainQueryStage {
|
|
var res []*ExplainQueryStage
|
|
for _, s := range stages {
|
|
var steps []*ExplainQueryStep
|
|
for _, p := range s.Steps {
|
|
steps = append(steps, &ExplainQueryStep{
|
|
Kind: p.Kind,
|
|
Substeps: p.Substeps,
|
|
})
|
|
}
|
|
res = append(res, &ExplainQueryStage{
|
|
ComputeRatioAvg: s.ComputeRatioAvg,
|
|
ComputeRatioMax: s.ComputeRatioMax,
|
|
ID: s.Id,
|
|
Name: s.Name,
|
|
ReadRatioAvg: s.ReadRatioAvg,
|
|
ReadRatioMax: s.ReadRatioMax,
|
|
RecordsRead: s.RecordsRead,
|
|
RecordsWritten: s.RecordsWritten,
|
|
Status: s.Status,
|
|
Steps: steps,
|
|
WaitRatioAvg: s.WaitRatioAvg,
|
|
WaitRatioMax: s.WaitRatioMax,
|
|
WriteRatioAvg: s.WriteRatioAvg,
|
|
WriteRatioMax: s.WriteRatioMax,
|
|
})
|
|
}
|
|
return res
|
|
}
|