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query.go
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query.go
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// Copyright 2022-2023, Matthew Winter
//
// 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
//
// https://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 main
import (
"bufio"
"context"
"encoding/csv"
"fmt"
"io"
"os"
"time"
"cloud.google.com/go/bigquery"
"google.golang.org/api/iterator"
)
type Query struct {
SQL string
Error error
QueryStartTime time.Time
QueryEndTime time.Time
FirstRowReturnedTime time.Time
AllRowsReturnedTime time.Time
TotalRowsReturned int64
}
//---------------------------------------------------------------------------------------
// Read the BigQuery SQL into memory from STDIN ready for execution
func (sql *Query) ReadStdIn() error {
// Check if there is somethinig to read on STDIN, return error if not
stat, _ := os.Stdin.Stat()
if (stat.Mode() & os.ModeCharDevice) != 0 {
return fmt.Errorf("[ReadStdIn] No SQL Found")
}
// Read data from STDIN
buf, err := io.ReadAll(os.Stdin)
if err != nil {
return fmt.Errorf("[ReadStdIn] Read All Failed: %w", err)
}
sql.SQL = string(buf)
logger.Debug().Msg("Query Details")
logger.Debug().Str("SQL", sql.SQL).Msg(indent)
return nil
}
//---------------------------------------------------------------------------------------
// Execute the SQL in BigQuery
func (sql *Query) ExecuteQueries(project string, dataset string, location string, disableQueryCache bool, dryRun bool, delimiter string) error {
// Establish a BigQuery Client Connection
logger.Info().Msg("Establishing a BigQuery Client Connection")
ctx := context.Background()
client, err := bigquery.NewClient(ctx, project)
if err != nil {
return fmt.Errorf("Failed Establishing a BigQuery Client Connection: %w", err)
}
defer client.Close()
// BigQuery Client Configuration
client.Location = location
// Execute SQL
if dryRun {
sql.ExecuteDryRun(ctx, client, project, dataset, location, disableQueryCache)
sql.LogExecuteDryRun()
} else {
sql.ExecuteQuery(ctx, client, project, dataset, location, disableQueryCache, delimiter)
sql.LogExecuteQuery()
}
// Raise an Error if query execution failed
if sql.Error != nil {
return fmt.Errorf("One or More Queries Failed")
}
return nil
}
//---------------------------------------------------------------------------------------
// Execute Query
func (sql *Query) ExecuteQuery(ctx context.Context, client *bigquery.Client, project string, dataset string, location string, disableQueryCache bool, delimiter string) {
// Create and Configure Query
q := client.Query(sql.SQL)
q.DefaultProjectID = project
q.DefaultDatasetID = dataset
q.Location = location
q.DisableQueryCache = disableQueryCache
q.DryRun = false
// Initiate the Query Job
sql.QueryStartTime = time.Now()
it, err := q.Read(ctx)
sql.QueryEndTime = time.Now()
if err != nil {
sql.Error = err
return
}
// Ready the CSV Writer and use a buffered io writer for STDOUT
w := csv.NewWriter(bufio.NewWriter(os.Stdout))
w.Comma = rune(delimiter[0])
defer w.Flush()
var rl RowLoader
var rowCount int64
for {
err := it.Next(&rl)
if rowCount == 0 {
sql.FirstRowReturnedTime = time.Now()
}
if err == iterator.Done {
sql.AllRowsReturnedTime = time.Now()
sql.TotalRowsReturned = rowCount
break
}
if err != nil {
sql.Error = err
return
}
if err := w.Write(rl.Row); err != nil {
sql.Error = fmt.Errorf("Failed Writing to the Output File")
return
}
rowCount++
}
}
//---------------------------------------------------------------------------------------
// Execute Dry Run Query
func (sql *Query) ExecuteDryRun(ctx context.Context, client *bigquery.Client, project string, dataset string, location string, disableQueryCache bool) {
// Create and Configure Query
q := client.Query(sql.SQL)
q.DefaultProjectID = project
q.DefaultDatasetID = dataset
q.Location = location
q.DisableQueryCache = disableQueryCache
q.DryRun = true
// Initiate the Query Job
sql.QueryStartTime = time.Now()
job, err := q.Run(ctx)
if err != nil {
sql.Error = err
return
}
// Check the Last Status for Errors
status := job.LastStatus()
if err = status.Err(); err != nil {
sql.Error = err
return
}
sql.QueryEndTime = time.Now()
}
//---------------------------------------------------------------------------------------
// Output the Query Execution Statistics to the Log
func (sql *Query) LogExecuteQuery() {
logger.Info().Msg("Query Execution")
// Output Error Message if one exists, but nothing else
if sql.Error != nil {
logger.Error().Err(sql.Error).Msg(indent)
return
}
logger.Info().Time("Query Execution Start", sql.QueryStartTime).Msg(indent)
logger.Info().Time("Query Execution End", sql.QueryEndTime).Msg(indent)
logger.Info().TimeDiff("Execution Time (ms)", sql.QueryEndTime, sql.QueryStartTime).Msg(indent)
logger.Info().Time("First Row Returned", sql.FirstRowReturnedTime).Msg(indent)
logger.Info().Time("All Rows Returned", sql.AllRowsReturnedTime).Msg(indent)
logger.Info().TimeDiff("Return Time (ms)", sql.AllRowsReturnedTime, sql.QueryEndTime).Msg(indent)
logger.Info().Int64("Total Rows Returned", sql.TotalRowsReturned).Msg(indent)
}
//---------------------------------------------------------------------------------------
// Output the Query Dry Run Statistics to the Log
func (sql *Query) LogExecuteDryRun() {
logger.Info().Msg("Query Dry Run")
// Output Error Message if one exists, but nothing else
if sql.Error != nil {
logger.Error().Err(sql.Error).Msg(indent)
return
}
logger.Info().Time("Query Execution Start", sql.QueryStartTime).Msg(indent)
logger.Info().Time("Query Execution End", sql.QueryEndTime).Msg(indent)
logger.Info().TimeDiff("Execution Time (ms)", sql.QueryEndTime, sql.QueryStartTime).Msg(indent)
}