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utils.go
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/
utils.go
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"bytes"
"context"
"crypto/tls"
"encoding/json"
"encoding/xml"
"errors"
"fmt"
"io"
"net"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"reflect"
"runtime"
"runtime/pprof"
"runtime/trace"
"strings"
"sync"
"syscall"
"time"
"github.com/coreos/go-oidc"
"github.com/dustin/go-humanize"
"github.com/felixge/fgprof"
"github.com/gorilla/mux"
"github.com/minio/madmin-go"
"github.com/minio/minio-go/v7"
miniogopolicy "github.com/minio/minio-go/v7/pkg/policy"
"github.com/minio/pkg/certs"
"github.com/minio/pkg/env"
xnet "github.com/minio/pkg/net"
"github.com/nitrictech/minio/internal/config"
"github.com/nitrictech/minio/internal/config/api"
xtls "github.com/nitrictech/minio/internal/config/identity/tls"
"github.com/nitrictech/minio/internal/deadlineconn"
"github.com/nitrictech/minio/internal/fips"
"github.com/nitrictech/minio/internal/handlers"
"github.com/nitrictech/minio/internal/hash"
xhttp "github.com/nitrictech/minio/internal/http"
ioutilx "github.com/nitrictech/minio/internal/ioutil"
"github.com/nitrictech/minio/internal/logger"
"github.com/nitrictech/minio/internal/logger/message/audit"
"golang.org/x/oauth2"
)
const (
slashSeparator = "/"
)
// BucketAccessPolicy - Collection of canned bucket policy at a given prefix.
type BucketAccessPolicy struct {
Bucket string `json:"bucket"`
Prefix string `json:"prefix"`
Policy miniogopolicy.BucketPolicy `json:"policy"`
}
// IsErrIgnored returns whether given error is ignored or not.
func IsErrIgnored(err error, ignoredErrs ...error) bool {
return IsErr(err, ignoredErrs...)
}
// IsErr returns whether given error is exact error.
func IsErr(err error, errs ...error) bool {
for _, exactErr := range errs {
if errors.Is(err, exactErr) {
return true
}
}
return false
}
// ErrorRespToObjectError converts MinIO errors to minio object layer errors.
func ErrorRespToObjectError(err error, params ...string) error {
if err == nil {
return nil
}
bucket := ""
object := ""
if len(params) >= 1 {
bucket = params[0]
}
if len(params) == 2 {
object = params[1]
}
if xnet.IsNetworkOrHostDown(err, false) {
return BackendDown{Err: err.Error()}
}
minioErr, ok := err.(minio.ErrorResponse)
if !ok {
// We don't interpret non MinIO errors. As minio errors will
// have StatusCode to help to convert to object errors.
return err
}
switch minioErr.Code {
case "PreconditionFailed":
err = PreConditionFailed{}
case "InvalidRange":
err = InvalidRange{}
case "BucketAlreadyOwnedByYou":
err = BucketAlreadyOwnedByYou{}
case "BucketNotEmpty":
err = BucketNotEmpty{}
case "NoSuchBucketPolicy":
err = BucketPolicyNotFound{}
case "NoSuchLifecycleConfiguration":
err = BucketLifecycleNotFound{}
case "InvalidBucketName":
err = BucketNameInvalid{Bucket: bucket}
case "InvalidPart":
err = InvalidPart{}
case "NoSuchBucket":
err = BucketNotFound{Bucket: bucket}
case "NoSuchKey":
if object != "" {
err = ObjectNotFound{Bucket: bucket, Object: object}
} else {
err = BucketNotFound{Bucket: bucket}
}
case "XMinioInvalidObjectName":
err = ObjectNameInvalid{}
case "AccessDenied":
err = PrefixAccessDenied{
Bucket: bucket,
Object: object,
}
case "XAmzContentSHA256Mismatch":
err = hash.SHA256Mismatch{}
case "NoSuchUpload":
err = InvalidUploadID{}
case "EntityTooSmall":
err = PartTooSmall{}
}
switch minioErr.StatusCode {
case http.StatusMethodNotAllowed:
err = toObjectErr(errMethodNotAllowed, bucket, object)
}
return err
}
// returns 'true' if either string has space in the
// - beginning of a string
// OR
// - end of a string
func hasSpaceBE(s string) bool {
return strings.TrimSpace(s) != s
}
func request2BucketObjectName(r *http.Request) (bucketName, objectName string) {
path, err := getResource(r.URL.Path, r.Host, globalDomainNames)
if err != nil {
logger.CriticalIf(GlobalContext, err)
}
return path2BucketObject(path)
}
// path2BucketObjectWithBasePath returns bucket and prefix, if any,
// of a 'path'. basePath is trimmed from the front of the 'path'.
func path2BucketObjectWithBasePath(basePath, path string) (bucket, prefix string) {
path = strings.TrimPrefix(path, basePath)
path = strings.TrimPrefix(path, SlashSeparator)
m := strings.Index(path, SlashSeparator)
if m < 0 {
return path, ""
}
return path[:m], path[m+len(SlashSeparator):]
}
func path2BucketObject(s string) (bucket, prefix string) {
return path2BucketObjectWithBasePath("", s)
}
// cloneMSS will clone a map[string]string.
// If input is nil an empty map is returned, not nil.
func cloneMSS(v map[string]string) map[string]string {
r := make(map[string]string, len(v))
for k, v := range v {
r[k] = v
}
return r
}
// URI scheme constants.
const (
httpScheme = "http"
httpsScheme = "https"
)
// nopCharsetConverter is a dummy charset convert which just copies input to output,
// it is used to ignore custom encoding charset in S3 XML body.
func nopCharsetConverter(label string, input io.Reader) (io.Reader, error) {
return input, nil
}
// xmlDecoder provide decoded value in xml.
func xmlDecoder(body io.Reader, v interface{}, size int64) error {
var lbody io.Reader
if size > 0 {
lbody = io.LimitReader(body, size)
} else {
lbody = body
}
d := xml.NewDecoder(lbody)
// Ignore any encoding set in the XML body
d.CharsetReader = nopCharsetConverter
return d.Decode(v)
}
// hasContentMD5 returns true if Content-MD5 header is set.
func hasContentMD5(h http.Header) bool {
_, ok := h[xhttp.ContentMD5]
return ok
}
// http://docs.aws.amazon.com/AmazonS3/latest/dev/UploadingObjects.html
const (
// Maximum object size per PUT request is 5TB.
// This is a divergence from S3 limit on purpose to support
// use cases where users are going to upload large files
// using 'curl' and presigned URL.
globalMaxObjectSize = 5 * humanize.TiByte
// Minimum Part size for multipart upload is 5MiB
globalMinPartSize = 5 * humanize.MiByte
// Maximum Part size for multipart upload is 5GiB
globalMaxPartSize = 5 * humanize.GiByte
// Maximum Part ID for multipart upload is 10000
// (Acceptable values range from 1 to 10000 inclusive)
globalMaxPartID = 10000
)
// isMaxObjectSize - verify if max object size
func isMaxObjectSize(size int64) bool {
return size > globalMaxObjectSize
}
// // Check if part size is more than maximum allowed size.
func isMaxAllowedPartSize(size int64) bool {
return size > globalMaxPartSize
}
// Check if part size is more than or equal to minimum allowed size.
func isMinAllowedPartSize(size int64) bool {
return size >= globalMinPartSize
}
// isMaxPartNumber - Check if part ID is greater than the maximum allowed ID.
func isMaxPartID(partID int) bool {
return partID > globalMaxPartID
}
func contains(slice interface{}, elem interface{}) bool {
v := reflect.ValueOf(slice)
if v.Kind() == reflect.Slice {
for i := 0; i < v.Len(); i++ {
if v.Index(i).Interface() == elem {
return true
}
}
}
return false
}
// profilerWrapper is created becauses pkg/profiler doesn't
// provide any API to calculate the profiler file path in the
// disk since the name of this latter is randomly generated.
type profilerWrapper struct {
// Profile recorded at start of benchmark.
records map[string][]byte
stopFn func() ([]byte, error)
ext string
}
// record will record the profile and store it as the base.
func (p *profilerWrapper) record(profileType string, debug int, recordName string) {
var buf bytes.Buffer
if p.records == nil {
p.records = make(map[string][]byte)
}
err := pprof.Lookup(profileType).WriteTo(&buf, debug)
if err != nil {
return
}
p.records[recordName] = buf.Bytes()
}
// Records returns the recorded profiling if any.
func (p profilerWrapper) Records() map[string][]byte {
return p.records
}
// Stop the currently running benchmark.
func (p profilerWrapper) Stop() ([]byte, error) {
return p.stopFn()
}
// Extension returns the extension without dot prefix.
func (p profilerWrapper) Extension() string {
return p.ext
}
// Returns current profile data, returns error if there is no active
// profiling in progress. Stops an active profile.
func getProfileData() (map[string][]byte, error) {
globalProfilerMu.Lock()
defer globalProfilerMu.Unlock()
if len(globalProfiler) == 0 {
return nil, errors.New("profiler not enabled")
}
dst := make(map[string][]byte, len(globalProfiler))
for typ, prof := range globalProfiler {
// Stop the profiler
var err error
buf, err := prof.Stop()
delete(globalProfiler, typ)
if err == nil {
dst[typ+"."+prof.Extension()] = buf
}
for name, buf := range prof.Records() {
if len(buf) > 0 {
dst[typ+"-"+name+"."+prof.Extension()] = buf
}
}
}
return dst, nil
}
func setDefaultProfilerRates() {
runtime.MemProfileRate = 4096 // 512K -> 4K - Must be constant throughout application lifetime.
runtime.SetMutexProfileFraction(0) // Disable until needed
runtime.SetBlockProfileRate(0) // Disable until needed
}
// Starts a profiler returns nil if profiler is not enabled, caller needs to handle this.
func startProfiler(profilerType string) (minioProfiler, error) {
var prof profilerWrapper
prof.ext = "pprof"
// Enable profiler and set the name of the file that pkg/pprof
// library creates to store profiling data.
switch madmin.ProfilerType(profilerType) {
case madmin.ProfilerCPU:
dirPath, err := os.MkdirTemp("", "profile")
if err != nil {
return nil, err
}
fn := filepath.Join(dirPath, "cpu.out")
f, err := Create(fn)
if err != nil {
return nil, err
}
err = pprof.StartCPUProfile(f)
if err != nil {
return nil, err
}
prof.stopFn = func() ([]byte, error) {
pprof.StopCPUProfile()
err := f.Close()
if err != nil {
return nil, err
}
defer RemoveAll(dirPath)
return ioutilx.ReadFile(fn)
}
case madmin.ProfilerCPUIO:
// at 10k or more goroutines fgprof is likely to become
// unable to maintain its sampling rate and to significantly
// degrade the performance of your application
// https://github.com/felixge/fgprof#fgprof
if n := runtime.NumGoroutine(); n > 10000 && !globalIsCICD {
return nil, fmt.Errorf("unable to perform CPU IO profile with %d goroutines", n)
}
dirPath, err := os.MkdirTemp("", "profile")
if err != nil {
return nil, err
}
fn := filepath.Join(dirPath, "cpuio.out")
f, err := Create(fn)
if err != nil {
return nil, err
}
stop := fgprof.Start(f, fgprof.FormatPprof)
prof.stopFn = func() ([]byte, error) {
err := stop()
if err != nil {
return nil, err
}
err = f.Close()
if err != nil {
return nil, err
}
defer RemoveAll(dirPath)
return ioutilx.ReadFile(fn)
}
case madmin.ProfilerMEM:
runtime.GC()
prof.record("heap", 0, "before")
prof.stopFn = func() ([]byte, error) {
runtime.GC()
var buf bytes.Buffer
err := pprof.Lookup("heap").WriteTo(&buf, 0)
return buf.Bytes(), err
}
case madmin.ProfilerBlock:
runtime.SetBlockProfileRate(100)
prof.stopFn = func() ([]byte, error) {
var buf bytes.Buffer
err := pprof.Lookup("block").WriteTo(&buf, 0)
runtime.SetBlockProfileRate(0)
return buf.Bytes(), err
}
case madmin.ProfilerMutex:
prof.record("mutex", 0, "before")
runtime.SetMutexProfileFraction(1)
prof.stopFn = func() ([]byte, error) {
var buf bytes.Buffer
err := pprof.Lookup("mutex").WriteTo(&buf, 0)
runtime.SetMutexProfileFraction(0)
return buf.Bytes(), err
}
case madmin.ProfilerThreads:
prof.record("threadcreate", 0, "before")
prof.stopFn = func() ([]byte, error) {
var buf bytes.Buffer
err := pprof.Lookup("threadcreate").WriteTo(&buf, 0)
return buf.Bytes(), err
}
case madmin.ProfilerGoroutines:
prof.ext = "txt"
prof.record("goroutine", 1, "before")
prof.record("goroutine", 2, "before,debug=2")
prof.stopFn = func() ([]byte, error) {
var buf bytes.Buffer
err := pprof.Lookup("goroutine").WriteTo(&buf, 1)
return buf.Bytes(), err
}
case madmin.ProfilerTrace:
dirPath, err := os.MkdirTemp("", "profile")
if err != nil {
return nil, err
}
fn := filepath.Join(dirPath, "trace.out")
f, err := Create(fn)
if err != nil {
return nil, err
}
err = trace.Start(f)
if err != nil {
return nil, err
}
prof.ext = "trace"
prof.stopFn = func() ([]byte, error) {
trace.Stop()
err := f.Close()
if err != nil {
return nil, err
}
defer RemoveAll(dirPath)
return ioutilx.ReadFile(fn)
}
default:
return nil, errors.New("profiler type unknown")
}
return prof, nil
}
// minioProfiler - minio profiler interface.
type minioProfiler interface {
// Return recorded profiles, each profile associated with a distinct generic name.
Records() map[string][]byte
// Stop the profiler
Stop() ([]byte, error)
// Return extension of profile
Extension() string
}
// Global profiler to be used by service go-routine.
var (
globalProfiler map[string]minioProfiler
globalProfilerMu sync.Mutex
)
// dump the request into a string in JSON format.
func dumpRequest(r *http.Request) string {
header := r.Header.Clone()
header.Set("Host", r.Host)
// Replace all '%' to '%%' so that printer format parser
// to ignore URL encoded values.
rawURI := strings.ReplaceAll(r.RequestURI, "%", "%%")
req := struct {
Method string `json:"method"`
RequestURI string `json:"reqURI"`
Header http.Header `json:"header"`
}{r.Method, rawURI, header}
var buffer bytes.Buffer
enc := json.NewEncoder(&buffer)
enc.SetEscapeHTML(false)
if err := enc.Encode(&req); err != nil {
// Upon error just return Go-syntax representation of the value
return fmt.Sprintf("%#v", req)
}
// Formatted string.
return strings.TrimSpace(buffer.String())
}
// isFile - returns whether given path is a file or not.
func isFile(path string) bool {
if fi, err := os.Stat(path); err == nil {
return fi.Mode().IsRegular()
}
return false
}
// UTCNow - returns current UTC time.
func UTCNow() time.Time {
return time.Now().UTC()
}
// GenETag - generate UUID based ETag
func GenETag() string {
return ToS3ETag(getMD5Hash([]byte(mustGetUUID())))
}
// ToS3ETag - return checksum to ETag
func ToS3ETag(etag string) string {
etag = canonicalizeETag(etag)
if !strings.HasSuffix(etag, "-1") {
// Tools like s3cmd uses ETag as checksum of data to validate.
// Append "-1" to indicate ETag is not a checksum.
etag += "-1"
}
return etag
}
func newInternodeHTTPTransport(tlsConfig *tls.Config, dialTimeout time.Duration) func() http.RoundTripper {
// For more details about various values used here refer
// https://golang.org/pkg/net/http/#Transport documentation
tr := &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: xhttp.DialContextWithDNSCache(globalDNSCache, xhttp.NewInternodeDialContext(dialTimeout)),
MaxIdleConnsPerHost: 1024,
WriteBufferSize: 32 << 10, // 32KiB moving up from 4KiB default
ReadBufferSize: 32 << 10, // 32KiB moving up from 4KiB default
IdleConnTimeout: 15 * time.Second,
ResponseHeaderTimeout: 15 * time.Minute, // Set conservative timeouts for MinIO internode.
TLSHandshakeTimeout: 15 * time.Second,
ExpectContinueTimeout: 15 * time.Second,
TLSClientConfig: tlsConfig,
// Go net/http automatically unzip if content-type is
// gzip disable this feature, as we are always interested
// in raw stream.
DisableCompression: true,
}
// https://github.com/golang/go/issues/23559
// https://github.com/golang/go/issues/42534
// https://github.com/golang/go/issues/43989
// https://github.com/golang/go/issues/33425
// https://github.com/golang/go/issues/29246
// if tlsConfig != nil {
// trhttp2, _ := http2.ConfigureTransports(tr)
// if trhttp2 != nil {
// // ReadIdleTimeout is the timeout after which a health check using ping
// // frame will be carried out if no frame is received on the
// // connection. 5 minutes is sufficient time for any idle connection.
// trhttp2.ReadIdleTimeout = 5 * time.Minute
// // PingTimeout is the timeout after which the connection will be closed
// // if a response to Ping is not received.
// trhttp2.PingTimeout = dialTimeout
// // DisableCompression, if true, prevents the Transport from
// // requesting compression with an "Accept-Encoding: gzip"
// trhttp2.DisableCompression = true
// }
// }
return func() http.RoundTripper {
return tr
}
}
// Used by only proxied requests, specifically only supports HTTP/1.1
func newCustomHTTPProxyTransport(tlsConfig *tls.Config, dialTimeout time.Duration) func() *http.Transport {
// For more details about various values used here refer
// https://golang.org/pkg/net/http/#Transport documentation
tr := &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: xhttp.DialContextWithDNSCache(globalDNSCache, xhttp.NewInternodeDialContext(dialTimeout)),
MaxIdleConnsPerHost: 1024,
WriteBufferSize: 32 << 10, // 32KiB moving up from 4KiB default
ReadBufferSize: 32 << 10, // 32KiB moving up from 4KiB default
IdleConnTimeout: 15 * time.Second,
ResponseHeaderTimeout: 30 * time.Minute, // Set larger timeouts for proxied requests.
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 10 * time.Second,
TLSClientConfig: tlsConfig,
// Go net/http automatically unzip if content-type is
// gzip disable this feature, as we are always interested
// in raw stream.
DisableCompression: true,
}
return func() *http.Transport {
return tr
}
}
func newCustomHTTPTransport(tlsConfig *tls.Config, dialTimeout time.Duration) func() *http.Transport {
// For more details about various values used here refer
// https://golang.org/pkg/net/http/#Transport documentation
tr := &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: xhttp.DialContextWithDNSCache(globalDNSCache, xhttp.NewInternodeDialContext(dialTimeout)),
MaxIdleConnsPerHost: 1024,
WriteBufferSize: 32 << 10, // 32KiB moving up from 4KiB default
ReadBufferSize: 32 << 10, // 32KiB moving up from 4KiB default
IdleConnTimeout: 15 * time.Second,
ResponseHeaderTimeout: 3 * time.Minute,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 10 * time.Second,
TLSClientConfig: tlsConfig,
// Go net/http automatically unzip if content-type is
// gzip disable this feature, as we are always interested
// in raw stream.
DisableCompression: true,
}
// https://github.com/golang/go/issues/23559
// https://github.com/golang/go/issues/42534
// https://github.com/golang/go/issues/43989
// https://github.com/golang/go/issues/33425
// https://github.com/golang/go/issues/29246
// if tlsConfig != nil {
// trhttp2, _ := http2.ConfigureTransports(tr)
// if trhttp2 != nil {
// // ReadIdleTimeout is the timeout after which a health check using ping
// // frame will be carried out if no frame is received on the
// // connection. 5 minutes is sufficient time for any idle connection.
// trhttp2.ReadIdleTimeout = 5 * time.Minute
// // PingTimeout is the timeout after which the connection will be closed
// // if a response to Ping is not received.
// trhttp2.PingTimeout = dialTimeout
// // DisableCompression, if true, prevents the Transport from
// // requesting compression with an "Accept-Encoding: gzip"
// trhttp2.DisableCompression = true
// }
// }
return func() *http.Transport {
return tr
}
}
// NewHTTPTransportWithClientCerts returns a new http configuration
// used while communicating with the cloud backends.
func NewHTTPTransportWithClientCerts(clientCert, clientKey string) *http.Transport {
transport := newHTTPTransport(1 * time.Minute)
if clientCert != "" && clientKey != "" {
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
c, err := certs.NewManager(ctx, clientCert, clientKey, tls.LoadX509KeyPair)
if err != nil {
logger.LogIf(ctx, fmt.Errorf("failed to load client key and cert, please check your endpoint configuration: %s",
err.Error()))
}
if c != nil {
c.UpdateReloadDuration(10 * time.Second)
c.ReloadOnSignal(syscall.SIGHUP) // allow reloads upon SIGHUP
transport.TLSClientConfig.GetClientCertificate = c.GetClientCertificate
}
}
return transport
}
// NewHTTPTransport returns a new http configuration
// used while communicating with the cloud backends.
func NewHTTPTransport() *http.Transport {
return newHTTPTransport(1 * time.Minute)
}
// Default values for dial timeout
const defaultDialTimeout = 5 * time.Second
func newHTTPTransport(timeout time.Duration) *http.Transport {
tr := newCustomHTTPTransport(&tls.Config{
RootCAs: globalRootCAs,
ClientSessionCache: tls.NewLRUClientSessionCache(tlsClientSessionCacheSize),
}, defaultDialTimeout)()
// Customize response header timeout
tr.ResponseHeaderTimeout = timeout
return tr
}
type dialContext func(ctx context.Context, network, addr string) (net.Conn, error)
// newCustomDialContext setups a custom dialer for any external communication and proxies.
func newCustomDialContext() dialContext {
return func(ctx context.Context, network, addr string) (net.Conn, error) {
dialer := &net.Dialer{
Timeout: 15 * time.Second,
KeepAlive: 30 * time.Second,
}
conn, err := dialer.DialContext(ctx, network, addr)
if err != nil {
return nil, err
}
dconn := deadlineconn.New(conn).
WithReadDeadline(globalConnReadDeadline).
WithWriteDeadline(globalConnWriteDeadline)
return dconn, nil
}
}
// NewRemoteTargetHTTPTransport returns a new http configuration
// used while communicating with the remote replication targets.
func NewRemoteTargetHTTPTransport() func() *http.Transport {
// For more details about various values used here refer
// https://golang.org/pkg/net/http/#Transport documentation
tr := &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: newCustomDialContext(),
MaxIdleConnsPerHost: 1024,
WriteBufferSize: 32 << 10, // 32KiB moving up from 4KiB default
ReadBufferSize: 32 << 10, // 32KiB moving up from 4KiB default
IdleConnTimeout: 15 * time.Second,
TLSHandshakeTimeout: 5 * time.Second,
ExpectContinueTimeout: 5 * time.Second,
TLSClientConfig: &tls.Config{
RootCAs: globalRootCAs,
ClientSessionCache: tls.NewLRUClientSessionCache(tlsClientSessionCacheSize),
},
// Go net/http automatically unzip if content-type is
// gzip disable this feature, as we are always interested
// in raw stream.
DisableCompression: true,
}
return func() *http.Transport {
return tr
}
}
// Load the json (typically from disk file).
func jsonLoad(r io.ReadSeeker, data interface{}) error {
if _, err := r.Seek(0, io.SeekStart); err != nil {
return err
}
return json.NewDecoder(r).Decode(data)
}
// Save to disk file in json format.
func jsonSave(f interface {
io.WriteSeeker
Truncate(int64) error
}, data interface{},
) error {
b, err := json.Marshal(data)
if err != nil {
return err
}
if err = f.Truncate(0); err != nil {
return err
}
if _, err = f.Seek(0, io.SeekStart); err != nil {
return err
}
_, err = f.Write(b)
if err != nil {
return err
}
return nil
}
// ceilFrac takes a numerator and denominator representing a fraction
// and returns its ceiling. If denominator is 0, it returns 0 instead
// of crashing.
func ceilFrac(numerator, denominator int64) (ceil int64) {
if denominator == 0 {
// do nothing on invalid input
return
}
// Make denominator positive
if denominator < 0 {
numerator = -numerator
denominator = -denominator
}
ceil = numerator / denominator
if numerator > 0 && numerator%denominator != 0 {
ceil++
}
return
}
// cleanMinioInternalMetadataKeys removes X-Amz-Meta- prefix from minio internal
// encryption metadata.
func cleanMinioInternalMetadataKeys(metadata map[string]string) map[string]string {
newMeta := make(map[string]string, len(metadata))
for k, v := range metadata {
if strings.HasPrefix(k, "X-Amz-Meta-X-Minio-Internal-") {
newMeta[strings.TrimPrefix(k, "X-Amz-Meta-")] = v
} else {
newMeta[k] = v
}
}
return newMeta
}
// pathClean is like path.Clean but does not return "." for
// empty inputs, instead returns "empty" as is.
func pathClean(p string) string {
cp := path.Clean(p)
if cp == "." {
return ""
}
return cp
}
func trimLeadingSlash(ep string) string {
if len(ep) > 0 && ep[0] == '/' {
// Path ends with '/' preserve it
if ep[len(ep)-1] == '/' && len(ep) > 1 {
ep = path.Clean(ep)
ep += slashSeparator
} else {
ep = path.Clean(ep)
}
ep = ep[1:]
}
return ep
}
// unescapeGeneric is similar to url.PathUnescape or url.QueryUnescape
// depending on input, additionally also handles situations such as
// `//` are normalized as `/`, also removes any `/` prefix before
// returning.
func unescapeGeneric(p string, escapeFn func(string) (string, error)) (string, error) {
ep, err := escapeFn(p)
if err != nil {
return "", err
}
return trimLeadingSlash(ep), nil
}
// unescapePath is similar to unescapeGeneric but for specifically
// path unescaping.
func unescapePath(p string) (string, error) {
return unescapeGeneric(p, url.PathUnescape)
}
// similar to unescapeGeneric but never returns any error if the unescaping
// fails, returns the input as is in such occasion, not meant to be
// used where strict validation is expected.
func likelyUnescapeGeneric(p string, escapeFn func(string) (string, error)) string {
ep, err := unescapeGeneric(p, escapeFn)
if err != nil {
return p
}
return ep
}
func updateReqContext(ctx context.Context, objects ...ObjectV) context.Context {
req := logger.GetReqInfo(ctx)
if req != nil {
req.Lock()
defer req.Unlock()
req.Objects = make([]logger.ObjectVersion, 0, len(objects))
for _, ov := range objects {
req.Objects = append(req.Objects, logger.ObjectVersion{
ObjectName: ov.ObjectName,
VersionID: ov.VersionID,
})
}
return logger.SetReqInfo(ctx, req)
}
return ctx
}
// Returns context with ReqInfo details set in the context.
func newContext(r *http.Request, w http.ResponseWriter, api string) context.Context {
vars := mux.Vars(r)
bucket := vars["bucket"]
object := likelyUnescapeGeneric(vars["object"], url.PathUnescape)
reqInfo := &logger.ReqInfo{
DeploymentID: globalDeploymentID,
RequestID: w.Header().Get(xhttp.AmzRequestID),
RemoteHost: handlers.GetSourceIP(r),
Host: getHostName(r),
UserAgent: r.UserAgent(),
API: api,
BucketName: bucket,
ObjectName: object,
VersionID: strings.TrimSpace(r.Form.Get(xhttp.VersionID)),
}
return logger.SetReqInfo(r.Context(), reqInfo)
}
// Used for registering with rest handlers (have a look at registerStorageRESTHandlers for usage example)
// If it is passed ["aaaa", "bbbb"], it returns ["aaaa", "{aaaa:.*}", "bbbb", "{bbbb:.*}"]
func restQueries(keys ...string) []string {
var accumulator []string
for _, key := range keys {
accumulator = append(accumulator, key, "{"+key+":.*}")
}
return accumulator
}
// Suffix returns the longest common suffix of the provided strings
func lcpSuffix(strs []string) string {
return lcp(strs, false)
}
func lcp(strs []string, pre bool) string {
// short-circuit empty list
if len(strs) == 0 {
return ""
}
xfix := strs[0]
// short-circuit single-element list
if len(strs) == 1 {
return xfix
}
// compare first to rest
for _, str := range strs[1:] {
xfixl := len(xfix)
strl := len(str)
// short-circuit empty strings
if xfixl == 0 || strl == 0 {
return ""
}
// maximum possible length
maxl := xfixl
if strl < maxl {
maxl = strl
}
// compare letters
if pre {
// prefix, iterate left to right
for i := 0; i < maxl; i++ {
if xfix[i] != str[i] {
xfix = xfix[:i]
break
}
}
} else {
// suffix, iterate right to left
for i := 0; i < maxl; i++ {
xi := xfixl - i - 1
si := strl - i - 1
if xfix[xi] != str[si] {
xfix = xfix[xi+1:]
break
}
}
}
}
return xfix
}
// Returns the mode in which MinIO is running
func getMinioMode() string {
mode := globalMinioModeFS
if globalIsDistErasure {