mirror of
https://github.com/Oxalide/vsphere-influxdb-go.git
synced 2023-10-10 13:36:51 +02:00
683 lines
15 KiB
Go
683 lines
15 KiB
Go
|
package statement
|
||
|
|
||
|
import (
|
||
|
"bufio"
|
||
|
"bytes"
|
||
|
"crypto/rand"
|
||
|
"fmt"
|
||
|
"io"
|
||
|
"log"
|
||
|
"strconv"
|
||
|
"strings"
|
||
|
"time"
|
||
|
|
||
|
"github.com/influxdata/influxdb/stress/v2/statement"
|
||
|
)
|
||
|
|
||
|
// Token represents a lexical token.
|
||
|
type Token int
|
||
|
|
||
|
// The following tokens represent the different values in the AST that make up stressql
|
||
|
const (
|
||
|
ILLEGAL Token = iota
|
||
|
EOF
|
||
|
|
||
|
WS
|
||
|
|
||
|
literalBeg
|
||
|
// IDENT and the following are InfluxQL literal tokens.
|
||
|
IDENT // main
|
||
|
NUMBER // 12345.67
|
||
|
DURATIONVAL // 13h
|
||
|
STRING // "abc"
|
||
|
BADSTRING // "abc
|
||
|
TEMPLATEVAR // %f
|
||
|
literalEnd
|
||
|
|
||
|
COMMA // ,
|
||
|
LPAREN // (
|
||
|
RPAREN // )
|
||
|
LBRACKET // [
|
||
|
RBRACKET // ]
|
||
|
PIPE // |
|
||
|
PERIOD // .
|
||
|
|
||
|
keywordBeg
|
||
|
SET
|
||
|
USE
|
||
|
QUERY
|
||
|
INSERT
|
||
|
GO
|
||
|
DO
|
||
|
WAIT
|
||
|
STR
|
||
|
INT
|
||
|
FLOAT
|
||
|
EXEC
|
||
|
keywordEnd
|
||
|
)
|
||
|
|
||
|
var eof = rune(1)
|
||
|
|
||
|
func isWhitespace(ch rune) bool { return ch == ' ' || ch == '\t' || ch == '\n' }
|
||
|
|
||
|
func isDigit(r rune) bool {
|
||
|
return r >= '0' && r <= '9'
|
||
|
}
|
||
|
|
||
|
func isLetter(ch rune) bool {
|
||
|
return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || (ch == '@')
|
||
|
}
|
||
|
|
||
|
// Scanner scans over the file and converts the raw text into tokens
|
||
|
type Scanner struct {
|
||
|
r *bufio.Reader
|
||
|
}
|
||
|
|
||
|
// NewScanner returns a Scanner
|
||
|
func NewScanner(r io.Reader) *Scanner {
|
||
|
return &Scanner{r: bufio.NewReader(r)}
|
||
|
}
|
||
|
|
||
|
func (s *Scanner) read() rune {
|
||
|
ch, _, err := s.r.ReadRune()
|
||
|
if err != nil {
|
||
|
return eof
|
||
|
}
|
||
|
return ch
|
||
|
}
|
||
|
|
||
|
func (s *Scanner) unread() { _ = s.r.UnreadRune() }
|
||
|
|
||
|
// Scan moves to the next character in the file and returns a tokenized version as well as the literal
|
||
|
func (s *Scanner) Scan() (tok Token, lit string) {
|
||
|
ch := s.read()
|
||
|
|
||
|
if isWhitespace(ch) {
|
||
|
s.unread()
|
||
|
return s.scanWhitespace()
|
||
|
} else if isLetter(ch) {
|
||
|
s.unread()
|
||
|
return s.scanIdent()
|
||
|
} else if isDigit(ch) {
|
||
|
s.unread()
|
||
|
return s.scanNumber()
|
||
|
}
|
||
|
|
||
|
switch ch {
|
||
|
case eof:
|
||
|
return EOF, ""
|
||
|
case '"':
|
||
|
s.unread()
|
||
|
return s.scanIdent()
|
||
|
case '%':
|
||
|
s.unread()
|
||
|
return s.scanTemplateVar()
|
||
|
case ',':
|
||
|
return COMMA, ","
|
||
|
case '.':
|
||
|
return PERIOD, "."
|
||
|
case '(':
|
||
|
return LPAREN, "("
|
||
|
case ')':
|
||
|
return RPAREN, ")"
|
||
|
case '[':
|
||
|
return LBRACKET, "["
|
||
|
case ']':
|
||
|
return RBRACKET, "]"
|
||
|
case '|':
|
||
|
return PIPE, "|"
|
||
|
}
|
||
|
|
||
|
return ILLEGAL, string(ch)
|
||
|
}
|
||
|
|
||
|
func (s *Scanner) scanWhitespace() (tok Token, lit string) {
|
||
|
var buf bytes.Buffer
|
||
|
buf.WriteRune(s.read())
|
||
|
|
||
|
for {
|
||
|
if ch := s.read(); ch == eof {
|
||
|
break
|
||
|
} else if !isWhitespace(ch) {
|
||
|
s.unread()
|
||
|
break
|
||
|
} else {
|
||
|
buf.WriteRune(ch)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return WS, buf.String()
|
||
|
}
|
||
|
|
||
|
func (s *Scanner) scanIdent() (tok Token, lit string) {
|
||
|
var buf bytes.Buffer
|
||
|
buf.WriteRune(s.read())
|
||
|
|
||
|
for {
|
||
|
if ch := s.read(); ch == eof {
|
||
|
break
|
||
|
} else if !isLetter(ch) && !isDigit(ch) && ch != '_' && ch != ':' && ch != '=' && ch != '-' {
|
||
|
s.unread()
|
||
|
break
|
||
|
} else {
|
||
|
_, _ = buf.WriteRune(ch)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
switch strings.ToUpper(buf.String()) {
|
||
|
case "SET":
|
||
|
return SET, buf.String()
|
||
|
case "USE":
|
||
|
return USE, buf.String()
|
||
|
case "QUERY":
|
||
|
return QUERY, buf.String()
|
||
|
case "INSERT":
|
||
|
return INSERT, buf.String()
|
||
|
case "EXEC":
|
||
|
return EXEC, buf.String()
|
||
|
case "WAIT":
|
||
|
return WAIT, buf.String()
|
||
|
case "GO":
|
||
|
return GO, buf.String()
|
||
|
case "DO":
|
||
|
return DO, buf.String()
|
||
|
case "STR":
|
||
|
return STR, buf.String()
|
||
|
case "FLOAT":
|
||
|
return FLOAT, buf.String()
|
||
|
case "INT":
|
||
|
return INT, buf.String()
|
||
|
}
|
||
|
|
||
|
return IDENT, buf.String()
|
||
|
}
|
||
|
|
||
|
func (s *Scanner) scanTemplateVar() (tok Token, lit string) {
|
||
|
var buf bytes.Buffer
|
||
|
buf.WriteRune(s.read())
|
||
|
buf.WriteRune(s.read())
|
||
|
|
||
|
return TEMPLATEVAR, buf.String()
|
||
|
}
|
||
|
|
||
|
func (s *Scanner) scanNumber() (tok Token, lit string) {
|
||
|
var buf bytes.Buffer
|
||
|
buf.WriteRune(s.read())
|
||
|
|
||
|
for {
|
||
|
if ch := s.read(); ch == eof {
|
||
|
break
|
||
|
} else if ch == 'n' || ch == 's' || ch == 'm' {
|
||
|
_, _ = buf.WriteRune(ch)
|
||
|
return DURATIONVAL, buf.String()
|
||
|
} else if !isDigit(ch) {
|
||
|
s.unread()
|
||
|
break
|
||
|
} else {
|
||
|
_, _ = buf.WriteRune(ch)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return NUMBER, buf.String()
|
||
|
}
|
||
|
|
||
|
/////////////////////////////////
|
||
|
// PARSER ///////////////////////
|
||
|
/////////////////////////////////
|
||
|
|
||
|
// Parser turns the file from raw text into an AST
|
||
|
type Parser struct {
|
||
|
s *Scanner
|
||
|
buf struct {
|
||
|
tok Token
|
||
|
lit string
|
||
|
n int
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// NewParser creates a new Parser
|
||
|
func NewParser(r io.Reader) *Parser {
|
||
|
return &Parser{s: NewScanner(r)}
|
||
|
}
|
||
|
|
||
|
// Parse returns a Statement
|
||
|
func (p *Parser) Parse() (statement.Statement, error) {
|
||
|
tok, lit := p.scanIgnoreWhitespace()
|
||
|
|
||
|
switch tok {
|
||
|
case QUERY:
|
||
|
p.unscan()
|
||
|
return p.ParseQueryStatement()
|
||
|
case INSERT:
|
||
|
p.unscan()
|
||
|
return p.ParseInsertStatement()
|
||
|
case EXEC:
|
||
|
p.unscan()
|
||
|
return p.ParseExecStatement()
|
||
|
case SET:
|
||
|
p.unscan()
|
||
|
return p.ParseSetStatement()
|
||
|
case GO:
|
||
|
p.unscan()
|
||
|
return p.ParseGoStatement()
|
||
|
case WAIT:
|
||
|
p.unscan()
|
||
|
return p.ParseWaitStatement()
|
||
|
}
|
||
|
|
||
|
return nil, fmt.Errorf("Improper syntax\n unknown token found between statements, token: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
// ParseQueryStatement returns a QueryStatement
|
||
|
func (p *Parser) ParseQueryStatement() (*statement.QueryStatement, error) {
|
||
|
stmt := &statement.QueryStatement{
|
||
|
StatementID: RandStr(10),
|
||
|
}
|
||
|
if tok, lit := p.scanIgnoreWhitespace(); tok != QUERY {
|
||
|
return nil, fmt.Errorf("Error parsing Query Statement\n Expected: QUERY\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
tok, lit := p.scanIgnoreWhitespace()
|
||
|
if tok != IDENT {
|
||
|
return nil, fmt.Errorf("Error parsing Query Statement\n Expected: IDENT\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
stmt.Name = lit
|
||
|
|
||
|
for {
|
||
|
tok, lit := p.scan()
|
||
|
if tok == TEMPLATEVAR {
|
||
|
stmt.TemplateString += "%v"
|
||
|
stmt.Args = append(stmt.Args, lit)
|
||
|
} else if tok == DO {
|
||
|
tok, lit := p.scanIgnoreWhitespace()
|
||
|
if tok != NUMBER {
|
||
|
return nil, fmt.Errorf("Error parsing Query Statement\n Expected: NUMBER\n Found: %v\n", lit)
|
||
|
}
|
||
|
// Parse out the integer
|
||
|
i, err := strconv.ParseInt(lit, 10, 64)
|
||
|
if err != nil {
|
||
|
log.Fatalf("Error parsing integer in Query Statement:\n string: %v\n error: %v\n", lit, err)
|
||
|
}
|
||
|
stmt.Count = int(i)
|
||
|
break
|
||
|
} else if tok == WS && lit == "\n" {
|
||
|
continue
|
||
|
} else {
|
||
|
stmt.TemplateString += lit
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return stmt, nil
|
||
|
|
||
|
}
|
||
|
|
||
|
// ParseInsertStatement returns a InsertStatement
|
||
|
func (p *Parser) ParseInsertStatement() (*statement.InsertStatement, error) {
|
||
|
|
||
|
// Initialize the InsertStatement with a statementId
|
||
|
stmt := &statement.InsertStatement{
|
||
|
StatementID: RandStr(10),
|
||
|
}
|
||
|
|
||
|
// If the first word is INSERT
|
||
|
if tok, lit := p.scanIgnoreWhitespace(); tok != INSERT {
|
||
|
return nil, fmt.Errorf("Error parsing Insert Statement\n Expected: INSERT\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
// Next should come the NAME of the statement. It is IDENT type
|
||
|
tok, lit := p.scanIgnoreWhitespace()
|
||
|
if tok != IDENT {
|
||
|
return nil, fmt.Errorf("Error parsing Insert Statement\n Expected: IDENT\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
// Set the Name
|
||
|
stmt.Name = lit
|
||
|
|
||
|
// Next char should be a newline
|
||
|
tok, lit = p.scan()
|
||
|
if tok != WS {
|
||
|
return nil, fmt.Errorf("Error parsing Insert Statement\n Expected: WS\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
// We are now scanning the tags line
|
||
|
var prev Token
|
||
|
inTags := true
|
||
|
|
||
|
for {
|
||
|
// Start for loop by scanning
|
||
|
tok, lit = p.scan()
|
||
|
|
||
|
// If scaned is WS then we are just entering tags or leaving tags or fields
|
||
|
if tok == WS {
|
||
|
|
||
|
// If previous is COMMA then we are leaving measurement, continue
|
||
|
if prev == COMMA {
|
||
|
continue
|
||
|
}
|
||
|
// Otherwise we need to add a space to the template string and we are out of tags
|
||
|
stmt.TemplateString += " "
|
||
|
inTags = false
|
||
|
} else if tok == LBRACKET {
|
||
|
// If we are still inTags and there is a LBRACKET we are adding another template
|
||
|
if inTags {
|
||
|
stmt.TagCount++
|
||
|
}
|
||
|
|
||
|
// Add a space to fill template string with template result
|
||
|
stmt.TemplateString += "%v"
|
||
|
|
||
|
// parse template should return a template type
|
||
|
expr, err := p.ParseTemplate()
|
||
|
|
||
|
// If there is a Template parsing error return it
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
|
||
|
// Add template to parsed select statement
|
||
|
stmt.Templates = append(stmt.Templates, expr)
|
||
|
|
||
|
// A number signifies that we are in the Timestamp section
|
||
|
} else if tok == NUMBER {
|
||
|
// Add a space to fill template string with timestamp
|
||
|
stmt.TemplateString += "%v"
|
||
|
p.unscan()
|
||
|
|
||
|
// Parse out the Timestamp
|
||
|
ts, err := p.ParseTimestamp()
|
||
|
|
||
|
// If there is a Timestamp parsing error return it
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
|
||
|
// Set the Timestamp
|
||
|
stmt.Timestamp = ts
|
||
|
|
||
|
// Break loop as InsertStatement ends
|
||
|
break
|
||
|
} else if tok != IDENT && tok != COMMA {
|
||
|
return nil, fmt.Errorf("Error parsing Insert Statement\n Expected: IDENT or COMMA\n Found: %v\n", lit)
|
||
|
} else {
|
||
|
prev = tok
|
||
|
stmt.TemplateString += lit
|
||
|
}
|
||
|
|
||
|
}
|
||
|
|
||
|
return stmt, nil
|
||
|
}
|
||
|
|
||
|
// ParseTemplate returns a Template
|
||
|
func (p *Parser) ParseTemplate() (*statement.Template, error) {
|
||
|
|
||
|
// Blank template
|
||
|
tmplt := &statement.Template{}
|
||
|
|
||
|
for {
|
||
|
// Scan to start loop
|
||
|
tok, lit := p.scanIgnoreWhitespace()
|
||
|
|
||
|
// If the tok == IDENT explicit tags are passed. Add them to the list of tags
|
||
|
if tok == IDENT {
|
||
|
tmplt.Tags = append(tmplt.Tags, lit)
|
||
|
|
||
|
// Different flavors of functions
|
||
|
} else if tok == INT || tok == FLOAT || tok == STR {
|
||
|
p.unscan()
|
||
|
|
||
|
// Parse out the function
|
||
|
fn, err := p.ParseFunction()
|
||
|
|
||
|
// If there is a Function parsing error return it
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
|
||
|
// Set the Function on the Template
|
||
|
tmplt.Function = fn
|
||
|
|
||
|
// End of Function
|
||
|
} else if tok == RBRACKET {
|
||
|
break
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return tmplt, nil
|
||
|
}
|
||
|
|
||
|
// ParseExecStatement returns a ExecStatement
|
||
|
func (p *Parser) ParseExecStatement() (*statement.ExecStatement, error) {
|
||
|
// NEEDS TO PARSE ACTUAL PATH TO SCRIPT CURRENTLY ONLY DOES
|
||
|
// IDENT SCRIPT NAMES
|
||
|
|
||
|
stmt := &statement.ExecStatement{
|
||
|
StatementID: RandStr(10),
|
||
|
}
|
||
|
|
||
|
if tok, lit := p.scanIgnoreWhitespace(); tok != EXEC {
|
||
|
return nil, fmt.Errorf("Error parsing Exec Statement\n Expected: EXEC\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
tok, lit := p.scanIgnoreWhitespace()
|
||
|
if tok != IDENT {
|
||
|
return nil, fmt.Errorf("Error parsing Exec Statement\n Expected: IDENT\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
stmt.Script = lit
|
||
|
|
||
|
return stmt, nil
|
||
|
}
|
||
|
|
||
|
// ParseSetStatement returns a SetStatement
|
||
|
func (p *Parser) ParseSetStatement() (*statement.SetStatement, error) {
|
||
|
|
||
|
stmt := &statement.SetStatement{
|
||
|
StatementID: RandStr(10),
|
||
|
}
|
||
|
|
||
|
if tok, lit := p.scanIgnoreWhitespace(); tok != SET {
|
||
|
return nil, fmt.Errorf("Error parsing Set Statement\n Expected: SET\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
tok, lit := p.scanIgnoreWhitespace()
|
||
|
if tok != IDENT {
|
||
|
return nil, fmt.Errorf("Error parsing Set Statement\n Expected: IDENT\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
stmt.Var = lit
|
||
|
|
||
|
tok, lit = p.scanIgnoreWhitespace()
|
||
|
|
||
|
if tok != LBRACKET {
|
||
|
return nil, fmt.Errorf("Error parsing Set Statement\n Expected: RBRACKET\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
for {
|
||
|
tok, lit = p.scanIgnoreWhitespace()
|
||
|
if tok == RBRACKET {
|
||
|
break
|
||
|
} else if lit != "-" && lit != ":" && tok != IDENT && tok != NUMBER && tok != DURATIONVAL && tok != PERIOD && tok != PIPE {
|
||
|
return nil, fmt.Errorf("Error parsing Set Statement\n Expected: IDENT || NUMBER || DURATION\n Found: %v\n", lit)
|
||
|
}
|
||
|
stmt.Value += lit
|
||
|
}
|
||
|
|
||
|
return stmt, nil
|
||
|
}
|
||
|
|
||
|
// ParseWaitStatement returns a WaitStatement
|
||
|
func (p *Parser) ParseWaitStatement() (*statement.WaitStatement, error) {
|
||
|
|
||
|
stmt := &statement.WaitStatement{
|
||
|
StatementID: RandStr(10),
|
||
|
}
|
||
|
|
||
|
if tok, lit := p.scanIgnoreWhitespace(); tok != WAIT {
|
||
|
return nil, fmt.Errorf("Error parsing Wait Statement\n Expected: WAIT\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
return stmt, nil
|
||
|
}
|
||
|
|
||
|
// ParseGoStatement returns a GoStatement
|
||
|
func (p *Parser) ParseGoStatement() (*statement.GoStatement, error) {
|
||
|
|
||
|
stmt := &statement.GoStatement{}
|
||
|
stmt.StatementID = RandStr(10)
|
||
|
|
||
|
if tok, lit := p.scanIgnoreWhitespace(); tok != GO {
|
||
|
return nil, fmt.Errorf("Error parsing Go Statement\n Expected: GO\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
var body statement.Statement
|
||
|
var err error
|
||
|
|
||
|
tok, _ := p.scanIgnoreWhitespace()
|
||
|
switch tok {
|
||
|
case QUERY:
|
||
|
p.unscan()
|
||
|
body, err = p.ParseQueryStatement()
|
||
|
case INSERT:
|
||
|
p.unscan()
|
||
|
body, err = p.ParseInsertStatement()
|
||
|
case EXEC:
|
||
|
p.unscan()
|
||
|
body, err = p.ParseExecStatement()
|
||
|
}
|
||
|
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
|
||
|
stmt.Statement = body
|
||
|
|
||
|
return stmt, nil
|
||
|
|
||
|
}
|
||
|
|
||
|
// ParseFunction returns a Function
|
||
|
func (p *Parser) ParseFunction() (*statement.Function, error) {
|
||
|
|
||
|
fn := &statement.Function{}
|
||
|
|
||
|
_, lit := p.scanIgnoreWhitespace()
|
||
|
fn.Type = lit
|
||
|
|
||
|
_, lit = p.scanIgnoreWhitespace()
|
||
|
fn.Fn = lit
|
||
|
|
||
|
tok, lit := p.scanIgnoreWhitespace()
|
||
|
if tok != LPAREN {
|
||
|
return nil, fmt.Errorf("Error parsing Insert template function\n Expected: LPAREN\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
tok, lit = p.scanIgnoreWhitespace()
|
||
|
if tok != NUMBER {
|
||
|
return nil, fmt.Errorf("Error parsing Insert template function\n Expected: NUMBER\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
// Parse out the integer
|
||
|
i, err := strconv.ParseInt(lit, 10, 64)
|
||
|
|
||
|
if err != nil {
|
||
|
log.Fatalf("Error parsing integer in Insert template function:\n string: %v\n error: %v\n", lit, err)
|
||
|
}
|
||
|
|
||
|
fn.Argument = int(i)
|
||
|
|
||
|
tok, _ = p.scanIgnoreWhitespace()
|
||
|
if tok != RPAREN {
|
||
|
return nil, fmt.Errorf("Error parsing Insert template function\n Expected: RPAREN\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
tok, lit = p.scanIgnoreWhitespace()
|
||
|
if tok != NUMBER {
|
||
|
return nil, fmt.Errorf("Error parsing Insert template function\n Expected: NUMBER\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
// Parse out the integer
|
||
|
i, err = strconv.ParseInt(lit, 10, 64)
|
||
|
|
||
|
if err != nil {
|
||
|
log.Fatalf("Error parsing integer in Insert template function:\n string: %v\n error: %v\n", lit, err)
|
||
|
}
|
||
|
|
||
|
fn.Count = int(i)
|
||
|
|
||
|
return fn, nil
|
||
|
}
|
||
|
|
||
|
// ParseTimestamp returns a Timestamp
|
||
|
func (p *Parser) ParseTimestamp() (*statement.Timestamp, error) {
|
||
|
|
||
|
ts := &statement.Timestamp{}
|
||
|
|
||
|
tok, lit := p.scanIgnoreWhitespace()
|
||
|
if tok != NUMBER {
|
||
|
return nil, fmt.Errorf("Error parsing Insert timestamp\n Expected: NUMBER\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
// Parse out the integer
|
||
|
i, err := strconv.ParseInt(lit, 10, 64)
|
||
|
|
||
|
if err != nil {
|
||
|
log.Fatalf("Error parsing integer in Insert timestamp:\n string: %v\n error: %v\n", lit, err)
|
||
|
}
|
||
|
|
||
|
ts.Count = int(i)
|
||
|
|
||
|
tok, lit = p.scanIgnoreWhitespace()
|
||
|
if tok != DURATIONVAL {
|
||
|
return nil, fmt.Errorf("Error parsing Insert timestamp\n Expected: DURATION\n Found: %v\n", lit)
|
||
|
}
|
||
|
|
||
|
// Parse out the duration
|
||
|
dur, err := time.ParseDuration(lit)
|
||
|
|
||
|
if err != nil {
|
||
|
log.Fatalf("Error parsing duration in Insert timestamp:\n string: %v\n error: %v\n", lit, err)
|
||
|
}
|
||
|
|
||
|
ts.Duration = dur
|
||
|
|
||
|
return ts, nil
|
||
|
}
|
||
|
|
||
|
func (p *Parser) scan() (tok Token, lit string) {
|
||
|
// If we have a token on the buffer, then return it.
|
||
|
if p.buf.n != 0 {
|
||
|
p.buf.n = 0
|
||
|
return p.buf.tok, p.buf.lit
|
||
|
}
|
||
|
|
||
|
// Otherwise read the next token from the scanner.
|
||
|
tok, lit = p.s.Scan()
|
||
|
|
||
|
// Save it to the buffer in case we unscan later.
|
||
|
p.buf.tok, p.buf.lit = tok, lit
|
||
|
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// scanIgnoreWhitespace scans the next non-whitespace token.
|
||
|
func (p *Parser) scanIgnoreWhitespace() (tok Token, lit string) {
|
||
|
tok, lit = p.scan()
|
||
|
if tok == WS {
|
||
|
tok, lit = p.scan()
|
||
|
}
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// unscan pushes the previously read token back onto the buffer.
|
||
|
func (p *Parser) unscan() { p.buf.n = 1 }
|
||
|
|
||
|
// RandStr returns a string of random characters with length n
|
||
|
func RandStr(n int) string {
|
||
|
b := make([]byte, n/2)
|
||
|
_, _ = rand.Read(b)
|
||
|
return fmt.Sprintf("%x", b)
|
||
|
}
|