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175 lines
5.3 KiB
Go
175 lines
5.3 KiB
Go
// Metadata manipulation in and out of Headers
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package swift
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import (
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"fmt"
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"net/http"
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"strconv"
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"strings"
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"time"
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)
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// Metadata stores account, container or object metadata.
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type Metadata map[string]string
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// Metadata gets the Metadata starting with the metaPrefix out of the Headers.
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//
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// The keys in the Metadata will be converted to lower case
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func (h Headers) Metadata(metaPrefix string) Metadata {
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m := Metadata{}
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metaPrefix = http.CanonicalHeaderKey(metaPrefix)
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for key, value := range h {
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if strings.HasPrefix(key, metaPrefix) {
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metaKey := strings.ToLower(key[len(metaPrefix):])
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m[metaKey] = value
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}
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}
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return m
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}
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// AccountMetadata converts Headers from account to a Metadata.
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//
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// The keys in the Metadata will be converted to lower case.
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func (h Headers) AccountMetadata() Metadata {
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return h.Metadata("X-Account-Meta-")
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}
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// ContainerMetadata converts Headers from container to a Metadata.
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//
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// The keys in the Metadata will be converted to lower case.
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func (h Headers) ContainerMetadata() Metadata {
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return h.Metadata("X-Container-Meta-")
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}
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// ObjectMetadata converts Headers from object to a Metadata.
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//
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// The keys in the Metadata will be converted to lower case.
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func (h Headers) ObjectMetadata() Metadata {
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return h.Metadata("X-Object-Meta-")
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}
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// Headers convert the Metadata starting with the metaPrefix into a
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// Headers.
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//
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// The keys in the Metadata will be converted from lower case to http
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// Canonical (see http.CanonicalHeaderKey).
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func (m Metadata) Headers(metaPrefix string) Headers {
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h := Headers{}
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for key, value := range m {
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key = http.CanonicalHeaderKey(metaPrefix + key)
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h[key] = value
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}
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return h
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}
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// AccountHeaders converts the Metadata for the account.
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func (m Metadata) AccountHeaders() Headers {
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return m.Headers("X-Account-Meta-")
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}
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// ContainerHeaders converts the Metadata for the container.
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func (m Metadata) ContainerHeaders() Headers {
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return m.Headers("X-Container-Meta-")
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}
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// ObjectHeaders converts the Metadata for the object.
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func (m Metadata) ObjectHeaders() Headers {
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return m.Headers("X-Object-Meta-")
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}
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// Turns a number of ns into a floating point string in seconds
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//
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// Trims trailing zeros and guaranteed to be perfectly accurate
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func nsToFloatString(ns int64) string {
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if ns < 0 {
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return "-" + nsToFloatString(-ns)
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}
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result := fmt.Sprintf("%010d", ns)
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split := len(result) - 9
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result, decimals := result[:split], result[split:]
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decimals = strings.TrimRight(decimals, "0")
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if decimals != "" {
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result += "."
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result += decimals
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}
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return result
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}
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// Turns a floating point string in seconds into a ns integer
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//
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// Guaranteed to be perfectly accurate
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func floatStringToNs(s string) (int64, error) {
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const zeros = "000000000"
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if point := strings.IndexRune(s, '.'); point >= 0 {
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tail := s[point+1:]
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if fill := 9 - len(tail); fill < 0 {
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tail = tail[:9]
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} else {
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tail += zeros[:fill]
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}
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s = s[:point] + tail
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} else if len(s) > 0 { // Make sure empty string produces an error
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s += zeros
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}
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return strconv.ParseInt(s, 10, 64)
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}
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// FloatStringToTime converts a floating point number string to a time.Time
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//
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// The string is floating point number of seconds since the epoch
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// (Unix time). The number should be in fixed point format (not
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// exponential), eg "1354040105.123456789" which represents the time
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// "2012-11-27T18:15:05.123456789Z"
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//
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// Some care is taken to preserve all the accuracy in the time.Time
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// (which wouldn't happen with a naive conversion through float64) so
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// a round trip conversion won't change the data.
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//
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// If an error is returned then time will be returned as the zero time.
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func FloatStringToTime(s string) (t time.Time, err error) {
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ns, err := floatStringToNs(s)
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if err != nil {
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return
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}
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t = time.Unix(0, ns)
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return
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}
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// TimeToFloatString converts a time.Time object to a floating point string
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//
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// The string is floating point number of seconds since the epoch
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// (Unix time). The number is in fixed point format (not
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// exponential), eg "1354040105.123456789" which represents the time
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// "2012-11-27T18:15:05.123456789Z". Trailing zeros will be dropped
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// from the output.
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//
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// Some care is taken to preserve all the accuracy in the time.Time
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// (which wouldn't happen with a naive conversion through float64) so
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// a round trip conversion won't change the data.
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func TimeToFloatString(t time.Time) string {
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return nsToFloatString(t.UnixNano())
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}
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// Read a modification time (mtime) from a Metadata object
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//
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// This is a defacto standard (used in the official python-swiftclient
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// amongst others) for storing the modification time (as read using
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// os.Stat) for an object. It is stored using the key 'mtime', which
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// for example when written to an object will be 'X-Object-Meta-Mtime'.
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//
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// If an error is returned then time will be returned as the zero time.
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func (m Metadata) GetModTime() (t time.Time, err error) {
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return FloatStringToTime(m["mtime"])
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}
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// Write an modification time (mtime) to a Metadata object
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//
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// This is a defacto standard (used in the official python-swiftclient
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// amongst others) for storing the modification time (as read using
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// os.Stat) for an object. It is stored using the key 'mtime', which
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// for example when written to an object will be 'X-Object-Meta-Mtime'.
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func (m Metadata) SetModTime(t time.Time) {
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m["mtime"] = TimeToFloatString(t)
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}
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