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util.go
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util.go
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// Copyright (c) 2017-2021 Snowflake Computing Inc. All right reserved.
package gosnowflake
import (
"context"
"database/sql/driver"
"io"
"math/rand"
"strings"
"sync"
"time"
"github.com/google/uuid"
)
type contextKey string
const (
// multiStatementCount controls the number of queries to execute in a single API call
multiStatementCount contextKey = "MULTI_STATEMENT_COUNT"
// asyncMode tells the server to not block the request on executing the entire query
asyncMode contextKey = "ASYNC_MODE_QUERY"
// queryIDChannel is the channel to receive the query ID from
queryIDChannel contextKey = "QUERY_ID_CHANNEL"
// snowflakeRequestIDKey is optional context key to specify request id
snowflakeRequestIDKey contextKey = "SNOWFLAKE_REQUEST_ID"
// fetchResultByID the queryID of query result to fetch
fetchResultByID contextKey = "SF_FETCH_RESULT_BY_ID"
// fileStreamFile is the address of the file to be uploaded via PUT
fileStreamFile contextKey = "STREAMING_PUT_FILE"
// fileTransferOptions allows the user to pass in custom
fileTransferOptions contextKey = "FILE_TRANSFER_OPTIONS"
// enableHigherPrecision returns numbers with higher precision in a *big format
enableHigherPrecision contextKey = "ENABLE_HIGHER_PRECISION"
)
const (
describeOnly contextKey = "DESCRIBE_ONLY"
cancelRetry contextKey = "CANCEL_RETRY"
streamChunkDownload contextKey = "STREAM_CHUNK_DOWNLOAD"
)
// WithMultiStatement returns a context that allows the user to execute the desired number of sql queries in one query
func WithMultiStatement(ctx context.Context, num int) (context.Context, error) {
return context.WithValue(ctx, multiStatementCount, num), nil
}
// WithAsyncMode returns a context that allows execution of query in async mode
func WithAsyncMode(ctx context.Context) context.Context {
return context.WithValue(ctx, asyncMode, true)
}
// WithQueryIDChan returns a context that contains the channel to receive the query ID
func WithQueryIDChan(ctx context.Context, c chan<- string) context.Context {
return context.WithValue(ctx, queryIDChannel, c)
}
// WithRequestID returns a new context with the specified snowflake request id
func WithRequestID(ctx context.Context, requestID uuid.UUID) context.Context {
return context.WithValue(ctx, snowflakeRequestIDKey, requestID)
}
// WithStreamDownloader returns a context that allows the use of a stream based chunk downloader
func WithStreamDownloader(ctx context.Context) context.Context {
return context.WithValue(ctx, streamChunkDownload, true)
}
// WithFetchResultByID returns a context that allows retrieving the result by query ID
func WithFetchResultByID(ctx context.Context, queryID string) context.Context {
return context.WithValue(ctx, fetchResultByID, queryID)
}
// WithFileStream returns a context that contains the address of the file stream to be PUT
func WithFileStream(ctx context.Context, reader io.Reader) context.Context {
return context.WithValue(ctx, fileStreamFile, reader)
}
// WithFileTransferOptions returns a context that contains the address of file transfer options
func WithFileTransferOptions(ctx context.Context, options *SnowflakeFileTransferOptions) context.Context {
return context.WithValue(ctx, fileTransferOptions, options)
}
// WithDescribeOnly returns a context that enables a describe only query
func WithDescribeOnly(ctx context.Context) context.Context {
return context.WithValue(ctx, describeOnly, true)
}
// WithHigherPrecision returns a context that enables higher precision by
// returning a *big.Int or *big.Float variable when querying rows for column
// types with numbers that don't fit into its native Golang counterpart
func WithHigherPrecision(ctx context.Context) context.Context {
return context.WithValue(ctx, enableHigherPrecision, true)
}
// Get the request ID from the context if specified, otherwise generate one
func getOrGenerateRequestIDFromContext(ctx context.Context) uuid.UUID {
requestID, ok := ctx.Value(snowflakeRequestIDKey).(uuid.UUID)
if ok && requestID != uuid.Nil {
return requestID
}
return uuid.New()
}
// integer min
func intMin(a, b int) int {
if a < b {
return a
}
return b
}
// integer max
func intMax(a, b int) int {
if a > b {
return a
}
return b
}
func int64Max(a, b int64) int64 {
if a > b {
return a
}
return b
}
func getMin(arr []int) int {
if len(arr) == 0 {
return -1
}
min := arr[0]
for _, v := range arr {
if v <= min {
min = v
}
}
return min
}
// time.Duration max
func durationMax(d1, d2 time.Duration) time.Duration {
if d1-d2 > 0 {
return d1
}
return d2
}
// time.Duration min
func durationMin(d1, d2 time.Duration) time.Duration {
if d1-d2 < 0 {
return d1
}
return d2
}
// toNamedValues converts a slice of driver.Value to a slice of driver.NamedValue for Go 1.8 SQL package
func toNamedValues(values []driver.Value) []driver.NamedValue {
namedValues := make([]driver.NamedValue, len(values))
for idx, value := range values {
namedValues[idx] = driver.NamedValue{Name: "", Ordinal: idx + 1, Value: value}
}
return namedValues
}
// TokenAccessor manages the session token and master token
type TokenAccessor interface {
GetTokens() (token string, masterToken string, sessionID int64)
SetTokens(token string, masterToken string, sessionID int64)
Lock() error
Unlock()
}
type simpleTokenAccessor struct {
token string
masterToken string
sessionID int64
accessorLock sync.Mutex // Used to implement accessor's Lock and Unlock
tokenLock sync.RWMutex // Used to synchronize SetTokens and GetTokens
}
func getSimpleTokenAccessor() TokenAccessor {
return &simpleTokenAccessor{sessionID: -1}
}
func (sta *simpleTokenAccessor) Lock() error {
sta.accessorLock.Lock()
return nil
}
func (sta *simpleTokenAccessor) Unlock() {
sta.accessorLock.Unlock()
}
func (sta *simpleTokenAccessor) GetTokens() (token string, masterToken string, sessionID int64) {
sta.tokenLock.RLock()
defer sta.tokenLock.RUnlock()
return sta.token, sta.masterToken, sta.sessionID
}
func (sta *simpleTokenAccessor) SetTokens(token string, masterToken string, sessionID int64) {
sta.tokenLock.Lock()
defer sta.tokenLock.Unlock()
sta.token = token
sta.masterToken = masterToken
sta.sessionID = sessionID
}
func escapeForCSV(value string) string {
if value == "" {
return "\"\""
}
if strings.Contains(value, "\"") || strings.Contains(value, "\n") ||
strings.Contains(value, ",") || strings.Contains(value, "\\") {
return "\"" + strings.ReplaceAll(value, "\"", "\"\"") + "\""
}
return value
}
func randomString(n int) string {
rand.Seed(time.Now().UnixNano())
alpha := []rune("abcdefghijklmnopqrstuvwxyz")
b := make([]rune, n)
for i := range b {
b[i] = alpha[rand.Intn(len(alpha))]
}
return string(b)
}