well-goknown/vendor/github.com/fiatjaf/eventstore/postgresql/init.go

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package postgresql
import (
"github.com/fiatjaf/eventstore"
"github.com/jmoiron/sqlx"
"github.com/jmoiron/sqlx/reflectx"
_ "github.com/lib/pq"
)
const (
queryLimit = 100
queryIDsLimit = 500
queryAuthorsLimit = 500
queryKindsLimit = 10
queryTagsLimit = 10
)
var _ eventstore.Store = (*PostgresBackend)(nil)
func (b *PostgresBackend) Init() error {
db, err := sqlx.Connect("postgres", b.DatabaseURL)
if err != nil {
return err
}
// sqlx default is 0 (unlimited), while postgresql by default accepts up to 100 connections
db.SetMaxOpenConns(80)
db.Mapper = reflectx.NewMapperFunc("json", sqlx.NameMapper)
b.DB = db
_, err = b.DB.Exec(`
CREATE OR REPLACE FUNCTION tags_to_tagvalues(jsonb) RETURNS text[]
AS 'SELECT array_agg(t->>1) FROM (SELECT jsonb_array_elements($1) AS t)s WHERE length(t->>0) = 1;'
LANGUAGE SQL
IMMUTABLE
RETURNS NULL ON NULL INPUT;
CREATE TABLE IF NOT EXISTS event (
id text NOT NULL,
pubkey text NOT NULL,
created_at integer NOT NULL,
kind integer NOT NULL,
tags jsonb NOT NULL,
content text NOT NULL,
sig text NOT NULL,
tagvalues text[] GENERATED ALWAYS AS (tags_to_tagvalues(tags)) STORED
);
CREATE UNIQUE INDEX IF NOT EXISTS ididx ON event USING btree (id text_pattern_ops);
CREATE INDEX IF NOT EXISTS pubkeyprefix ON event USING btree (pubkey text_pattern_ops);
CREATE INDEX IF NOT EXISTS timeidx ON event (created_at DESC);
CREATE INDEX IF NOT EXISTS kindidx ON event (kind);
CREATE INDEX IF NOT EXISTS kindtimeidx ON event(kind,created_at DESC);
CREATE INDEX IF NOT EXISTS arbitrarytagvalues ON event USING gin (tagvalues);
`)
if b.QueryLimit == 0 {
b.QueryLimit = queryLimit
}
if b.QueryIDsLimit == 0 {
b.QueryIDsLimit = queryIDsLimit
}
if b.QueryAuthorsLimit == 0 {
b.QueryAuthorsLimit = queryAuthorsLimit
}
if b.QueryKindsLimit == 0 {
b.QueryKindsLimit = queryKindsLimit
}
if b.QueryTagsLimit == 0 {
b.QueryTagsLimit = queryTagsLimit
}
return err
}