2b4f0a870f
The message stores don't need to access the internal network struct, they just need network metadata such as ID and name. This can ease moving message stores into a separate package in the future.
123 lines
3.7 KiB
Go
123 lines
3.7 KiB
Go
package soju
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import (
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"bytes"
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"encoding/base64"
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"fmt"
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"time"
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"git.sr.ht/~sircmpwn/go-bare"
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"gopkg.in/irc.v3"
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)
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// messageStore is a per-user store for IRC messages.
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type messageStore interface {
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Close() error
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// LastMsgID queries the last message ID for the given network, entity and
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// date. The message ID returned may not refer to a valid message, but can be
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// used in history queries.
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LastMsgID(network *Network, entity string, t time.Time) (string, error)
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// LoadLatestID queries the latest non-event messages for the given network,
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// entity and date, up to a count of limit messages, sorted from oldest to newest.
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LoadLatestID(network *Network, entity, id string, limit int) ([]*irc.Message, error)
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Append(network *Network, entity string, msg *irc.Message) (id string, err error)
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}
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type chatHistoryTarget struct {
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Name string
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LatestMessage time.Time
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}
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// chatHistoryMessageStore is a message store that supports chat history
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// operations.
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type chatHistoryMessageStore interface {
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messageStore
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// ListTargets lists channels and nicknames by time of the latest message.
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// It returns up to limit targets, starting from start and ending on end,
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// both excluded. end may be before or after start.
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// If events is false, only PRIVMSG/NOTICE messages are considered.
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ListTargets(network *Network, start, end time.Time, limit int, events bool) ([]chatHistoryTarget, error)
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// LoadBeforeTime loads up to limit messages before start down to end. The
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// returned messages must be between and excluding the provided bounds.
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// end is before start.
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// If events is false, only PRIVMSG/NOTICE messages are considered.
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LoadBeforeTime(network *Network, entity string, start, end time.Time, limit int, events bool) ([]*irc.Message, error)
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// LoadBeforeTime loads up to limit messages after start up to end. The
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// returned messages must be between and excluding the provided bounds.
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// end is after start.
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// If events is false, only PRIVMSG/NOTICE messages are considered.
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LoadAfterTime(network *Network, entity string, start, end time.Time, limit int, events bool) ([]*irc.Message, error)
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}
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type msgIDType uint
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const (
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msgIDNone msgIDType = iota
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msgIDMemory
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msgIDFS
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)
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const msgIDVersion uint = 0
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type msgIDHeader struct {
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Version uint
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Network bare.Int
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Target string
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Type msgIDType
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}
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type msgIDBody interface {
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msgIDType() msgIDType
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}
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func formatMsgID(netID int64, target string, body msgIDBody) string {
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var buf bytes.Buffer
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w := bare.NewWriter(&buf)
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header := msgIDHeader{
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Version: msgIDVersion,
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Network: bare.Int(netID),
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Target: target,
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Type: body.msgIDType(),
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}
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if err := bare.MarshalWriter(w, &header); err != nil {
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panic(err)
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}
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if err := bare.MarshalWriter(w, body); err != nil {
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panic(err)
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}
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return base64.RawURLEncoding.EncodeToString(buf.Bytes())
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}
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func parseMsgID(s string, body msgIDBody) (netID int64, target string, err error) {
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b, err := base64.RawURLEncoding.DecodeString(s)
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if err != nil {
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return 0, "", fmt.Errorf("invalid internal message ID: %v", err)
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}
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r := bare.NewReader(bytes.NewReader(b))
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var header msgIDHeader
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if err := bare.UnmarshalBareReader(r, &header); err != nil {
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return 0, "", fmt.Errorf("invalid internal message ID: %v", err)
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}
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if header.Version != msgIDVersion {
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return 0, "", fmt.Errorf("invalid internal message ID: got version %v, want %v", header.Version, msgIDVersion)
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}
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if body != nil {
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typ := body.msgIDType()
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if header.Type != typ {
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return 0, "", fmt.Errorf("invalid internal message ID: got type %v, want %v", header.Type, typ)
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}
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if err := bare.UnmarshalBareReader(r, body); err != nil {
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return 0, "", fmt.Errorf("invalid internal message ID: %v", err)
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}
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}
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return int64(header.Network), header.Target, nil
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}
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