Update all dependencies.

* Switch to using kingpin for CLI interface as upstream Prometheus has moved
  that way too.

vendor/github.com/lib/pq/encode.go

@@ -5,6 +5,7 @@ import (
 	"database/sql/driver"
 	"encoding/binary"
 	"encoding/hex"
+	"errors"
 	"fmt"
 	"math"
 	"strconv"
@@ -22,7 +23,6 @@ func binaryEncode(parameterStatus *parameterStatus, x interface{}) []byte {
 	default:
 		return encode(parameterStatus, x, oid.T_unknown)
 	}
-	panic("not reached")
 }
 
 func encode(parameterStatus *parameterStatus, x interface{}, pgtypOid oid.Oid) []byte {
@@ -56,10 +56,13 @@ func encode(parameterStatus *parameterStatus, x interface{}, pgtypOid oid.Oid) [
 }
 
 func decode(parameterStatus *parameterStatus, s []byte, typ oid.Oid, f format) interface{} {
-	if f == formatBinary {
+	switch f {
+	case formatBinary:
 		return binaryDecode(parameterStatus, s, typ)
-	} else {
+	case formatText:
 		return textDecode(parameterStatus, s, typ)
+	default:
+		panic("not reached")
 	}
 }
 
@@ -73,9 +76,15 @@ func binaryDecode(parameterStatus *parameterStatus, s []byte, typ oid.Oid) inter
 		return int64(int32(binary.BigEndian.Uint32(s)))
 	case oid.T_int2:
 		return int64(int16(binary.BigEndian.Uint16(s)))
+	case oid.T_uuid:
+		b, err := decodeUUIDBinary(s)
+		if err != nil {
+			panic(err)
+		}
+		return b
 
 	default:
-		errorf("don't know how to decode binary parameter of type %u", uint32(typ))
+		errorf("don't know how to decode binary parameter of type %d", uint32(typ))
 	}
 
 	panic("not reached")
@@ -83,8 +92,14 @@ func binaryDecode(parameterStatus *parameterStatus, s []byte, typ oid.Oid) inter
 
 func textDecode(parameterStatus *parameterStatus, s []byte, typ oid.Oid) interface{} {
 	switch typ {
+	case oid.T_char, oid.T_varchar, oid.T_text:
+		return string(s)
 	case oid.T_bytea:
-		return parseBytea(s)
+		b, err := parseBytea(s)
+		if err != nil {
+			errorf("%s", err)
+		}
+		return b
 	case oid.T_timestamptz:
 		return parseTs(parameterStatus.currentLocation, string(s))
 	case oid.T_timestamp, oid.T_date:
@@ -195,16 +210,39 @@ func mustParse(f string, typ oid.Oid, s []byte) time.Time {
 	return t
 }
 
-func expect(str, char string, pos int) {
-	if c := str[pos : pos+1]; c != char {
-		errorf("expected '%v' at position %v; got '%v'", char, pos, c)
+var errInvalidTimestamp = errors.New("invalid timestamp")
+
+type timestampParser struct {
+	err error
+}
+
+func (p *timestampParser) expect(str string, char byte, pos int) {
+	if p.err != nil {
+		return
+	}
+	if pos+1 > len(str) {
+		p.err = errInvalidTimestamp
+		return
+	}
+	if c := str[pos]; c != char && p.err == nil {
+		p.err = fmt.Errorf("expected '%v' at position %v; got '%v'", char, pos, c)
 	}
 }
 
-func mustAtoi(str string) int {
-	result, err := strconv.Atoi(str)
+func (p *timestampParser) mustAtoi(str string, begin int, end int) int {
+	if p.err != nil {
+		return 0
+	}
+	if begin < 0 || end < 0 || begin > end || end > len(str) {
+		p.err = errInvalidTimestamp
+		return 0
+	}
+	result, err := strconv.Atoi(str[begin:end])
 	if err != nil {
-		errorf("expected number; got '%v'", str)
+		if p.err == nil {
+			p.err = fmt.Errorf("expected number; got '%v'", str)
+		}
+		return 0
 	}
 	return result
 }
@@ -219,7 +257,7 @@ type locationCache struct {
 // about 5% speed could be gained by putting the cache in the connection and
 // losing the mutex, at the cost of a small amount of memory and a somewhat
 // significant increase in code complexity.
-var globalLocationCache *locationCache = newLocationCache()
+var globalLocationCache = newLocationCache()
 
 func newLocationCache() *locationCache {
 	return &locationCache{cache: make(map[int]*time.Location)}
@@ -249,26 +287,26 @@ const (
 	infinityTsNegativeMustBeSmaller = "pq: infinity timestamp: negative value must be smaller (before) than positive"
 )
 
-/*
- * If EnableInfinityTs is not called, "-infinity" and "infinity" will return
- * []byte("-infinity") and []byte("infinity") respectively, and potentially
- * cause error "sql: Scan error on column index 0: unsupported driver -> Scan pair: []uint8 -> *time.Time",
- * when scanning into a time.Time value.
- *
- * Once EnableInfinityTs has been called, all connections created using this
- * driver will decode Postgres' "-infinity" and "infinity" for "timestamp",
- * "timestamp with time zone" and "date" types to the predefined minimum and
- * maximum times, respectively.  When encoding time.Time values, any time which
- * equals or preceeds the predefined minimum time will be encoded to
- * "-infinity".  Any values at or past the maximum time will similarly be
- * encoded to "infinity".
- *
- *
- * If EnableInfinityTs is called with negative >= positive, it will panic.
- * Calling EnableInfinityTs after a connection has been established results in
- * undefined behavior.  If EnableInfinityTs is called more than once, it will
- * panic.
- */
+// EnableInfinityTs controls the handling of Postgres' "-infinity" and
+// "infinity" "timestamp"s.
+//
+// If EnableInfinityTs is not called, "-infinity" and "infinity" will return
+// []byte("-infinity") and []byte("infinity") respectively, and potentially
+// cause error "sql: Scan error on column index 0: unsupported driver -> Scan
+// pair: []uint8 -> *time.Time", when scanning into a time.Time value.
+//
+// Once EnableInfinityTs has been called, all connections created using this
+// driver will decode Postgres' "-infinity" and "infinity" for "timestamp",
+// "timestamp with time zone" and "date" types to the predefined minimum and
+// maximum times, respectively.  When encoding time.Time values, any time which
+// equals or precedes the predefined minimum time will be encoded to
+// "-infinity".  Any values at or past the maximum time will similarly be
+// encoded to "infinity".
+//
+// If EnableInfinityTs is called with negative >= positive, it will panic.
+// Calling EnableInfinityTs after a connection has been established results in
+// undefined behavior.  If EnableInfinityTs is called more than once, it will
+// panic.
 func EnableInfinityTs(negative time.Time, positive time.Time) {
 	if infinityTsEnabled {
 		panic(infinityTsEnabledAlready)
@@ -305,28 +343,48 @@ func parseTs(currentLocation *time.Location, str string) interface{} {
 		}
 		return []byte(str)
 	}
+	t, err := ParseTimestamp(currentLocation, str)
+	if err != nil {
+		panic(err)
+	}
+	return t
+}
+
+// ParseTimestamp parses Postgres' text format. It returns a time.Time in
+// currentLocation iff that time's offset agrees with the offset sent from the
+// Postgres server. Otherwise, ParseTimestamp returns a time.Time with the
+// fixed offset offset provided by the Postgres server.
+func ParseTimestamp(currentLocation *time.Location, str string) (time.Time, error) {
+	p := timestampParser{}
 
 	monSep := strings.IndexRune(str, '-')
 	// this is Gregorian year, not ISO Year
 	// In Gregorian system, the year 1 BC is followed by AD 1
-	year := mustAtoi(str[:monSep])
+	year := p.mustAtoi(str, 0, monSep)
 	daySep := monSep + 3
-	month := mustAtoi(str[monSep+1 : daySep])
-	expect(str, "-", daySep)
+	month := p.mustAtoi(str, monSep+1, daySep)
+	p.expect(str, '-', daySep)
 	timeSep := daySep + 3
-	day := mustAtoi(str[daySep+1 : timeSep])
+	day := p.mustAtoi(str, daySep+1, timeSep)
+
+	minLen := monSep + len("01-01") + 1
+
+	isBC := strings.HasSuffix(str, " BC")
+	if isBC {
+		minLen += 3
+	}
 
 	var hour, minute, second int
-	if len(str) > monSep+len("01-01")+1 {
-		expect(str, " ", timeSep)
+	if len(str) > minLen {
+		p.expect(str, ' ', timeSep)
 		minSep := timeSep + 3
-		expect(str, ":", minSep)
-		hour = mustAtoi(str[timeSep+1 : minSep])
+		p.expect(str, ':', minSep)
+		hour = p.mustAtoi(str, timeSep+1, minSep)
 		secSep := minSep + 3
-		expect(str, ":", secSep)
-		minute = mustAtoi(str[minSep+1 : secSep])
+		p.expect(str, ':', secSep)
+		minute = p.mustAtoi(str, minSep+1, secSep)
 		secEnd := secSep + 3
-		second = mustAtoi(str[secSep+1 : secEnd])
+		second = p.mustAtoi(str, secSep+1, secEnd)
 	}
 	remainderIdx := monSep + len("01-01 00:00:00") + 1
 	// Three optional (but ordered) sections follow: the
@@ -337,49 +395,51 @@ func parseTs(currentLocation *time.Location, str string) interface{} {
 	nanoSec := 0
 	tzOff := 0
 
-	if remainderIdx < len(str) && str[remainderIdx:remainderIdx+1] == "." {
+	if remainderIdx < len(str) && str[remainderIdx] == '.' {
 		fracStart := remainderIdx + 1
 		fracOff := strings.IndexAny(str[fracStart:], "-+ ")
 		if fracOff < 0 {
 			fracOff = len(str) - fracStart
 		}
-		fracSec := mustAtoi(str[fracStart : fracStart+fracOff])
+		fracSec := p.mustAtoi(str, fracStart, fracStart+fracOff)
 		nanoSec = fracSec * (1000000000 / int(math.Pow(10, float64(fracOff))))
 
 		remainderIdx += fracOff + 1
 	}
-	if tzStart := remainderIdx; tzStart < len(str) && (str[tzStart:tzStart+1] == "-" || str[tzStart:tzStart+1] == "+") {
+	if tzStart := remainderIdx; tzStart < len(str) && (str[tzStart] == '-' || str[tzStart] == '+') {
 		// time zone separator is always '-' or '+' (UTC is +00)
 		var tzSign int
-		if c := str[tzStart : tzStart+1]; c == "-" {
+		switch c := str[tzStart]; c {
+		case '-':
 			tzSign = -1
-		} else if c == "+" {
+		case '+':
 			tzSign = +1
-		} else {
-			errorf("expected '-' or '+' at position %v; got %v", tzStart, c)
+		default:
+			return time.Time{}, fmt.Errorf("expected '-' or '+' at position %v; got %v", tzStart, c)
 		}
-		tzHours := mustAtoi(str[tzStart+1 : tzStart+3])
+		tzHours := p.mustAtoi(str, tzStart+1, tzStart+3)
 		remainderIdx += 3
 		var tzMin, tzSec int
-		if tzStart+3 < len(str) && str[tzStart+3:tzStart+4] == ":" {
-			tzMin = mustAtoi(str[tzStart+4 : tzStart+6])
+		if remainderIdx < len(str) && str[remainderIdx] == ':' {
+			tzMin = p.mustAtoi(str, remainderIdx+1, remainderIdx+3)
 			remainderIdx += 3
 		}
-		if tzStart+6 < len(str) && str[tzStart+6:tzStart+7] == ":" {
-			tzSec = mustAtoi(str[tzStart+7 : tzStart+9])
+		if remainderIdx < len(str) && str[remainderIdx] == ':' {
+			tzSec = p.mustAtoi(str, remainderIdx+1, remainderIdx+3)
 			remainderIdx += 3
 		}
 		tzOff = tzSign * ((tzHours * 60 * 60) + (tzMin * 60) + tzSec)
 	}
 	var isoYear int
-	if remainderIdx < len(str) && str[remainderIdx:remainderIdx+3] == " BC" {
+
+	if isBC {
 		isoYear = 1 - year
 		remainderIdx += 3
 	} else {
 		isoYear = year
 	}
 	if remainderIdx < len(str) {
-		errorf("expected end of input, got %v", str[remainderIdx:])
+		return time.Time{}, fmt.Errorf("expected end of input, got %v", str[remainderIdx:])
 	}
 	t := time.Date(isoYear, time.Month(month), day,
 		hour, minute, second, nanoSec,
@@ -396,11 +456,11 @@ func parseTs(currentLocation *time.Location, str string) interface{} {
 		}
 	}
 
-	return t
+	return t, p.err
 }
 
 // formatTs formats t into a format postgres understands.
-func formatTs(t time.Time) (b []byte) {
+func formatTs(t time.Time) []byte {
 	if infinityTsEnabled {
 		// t <= -infinity : ! (t > -infinity)
 		if !t.After(infinityTsNegative) {
@@ -411,6 +471,11 @@ func formatTs(t time.Time) (b []byte) {
 			return []byte("infinity")
 		}
 	}
+	return FormatTimestamp(t)
+}
+
+// FormatTimestamp formats t into Postgres' text format for timestamps.
+func FormatTimestamp(t time.Time) []byte {
 	// Need to send dates before 0001 A.D. with " BC" suffix, instead of the
 	// minus sign preferred by Go.
 	// Beware, "0000" in ISO is "1 BC", "-0001" is "2 BC" and so on
@@ -420,7 +485,7 @@ func formatTs(t time.Time) (b []byte) {
 		t = t.AddDate((-t.Year())*2+1, 0, 0)
 		bc = true
 	}
-	b = []byte(t.Format(time.RFC3339Nano))
+	b := []byte(t.Format("2006-01-02 15:04:05.999999999Z07:00"))
 
 	_, offset := t.Zone()
 	offset = offset % 60
@@ -445,14 +510,14 @@ func formatTs(t time.Time) (b []byte) {
 
 // Parse a bytea value received from the server.  Both "hex" and the legacy
 // "escape" format are supported.
-func parseBytea(s []byte) (result []byte) {
+func parseBytea(s []byte) (result []byte, err error) {
 	if len(s) >= 2 && bytes.Equal(s[:2], []byte("\\x")) {
 		// bytea_output = hex
 		s = s[2:] // trim off leading "\\x"
 		result = make([]byte, hex.DecodedLen(len(s)))
 		_, err := hex.Decode(result, s)
 		if err != nil {
-			errorf("%s", err)
+			return nil, err
 		}
 	} else {
 		// bytea_output = escape
@@ -467,11 +532,11 @@ func parseBytea(s []byte) (result []byte) {
 
 				// '\\' followed by an octal number
 				if len(s) < 4 {
-					errorf("invalid bytea sequence %v", s)
+					return nil, fmt.Errorf("invalid bytea sequence %v", s)
 				}
 				r, err := strconv.ParseInt(string(s[1:4]), 8, 9)
 				if err != nil {
-					errorf("could not parse bytea value: %s", err.Error())
+					return nil, fmt.Errorf("could not parse bytea value: %s", err.Error())
 				}
 				result = append(result, byte(r))
 				s = s[4:]
@@ -489,7 +554,7 @@ func parseBytea(s []byte) (result []byte) {
 		}
 	}
 
-	return result
+	return result, nil
 }
 
 func encodeBytea(serverVersion int, v []byte) (result []byte) {