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69 lines
2.5 KiB
69 lines
2.5 KiB
// Package msql implements connecting to a MySQL/MariaDB instance (and possibly
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// others) and simplifies a number of interactions with it.
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package msql
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import (
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"context"
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"fmt"
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// If something is importing msql it must need mysql, because that's all
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// that is implemented at the moment
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_ "github.com/go-sql-driver/mysql"
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"github.com/jmoiron/sqlx"
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"github.com/mediocregopher/mediocre-go-lib/mcfg"
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"github.com/mediocregopher/mediocre-go-lib/mcmp"
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"github.com/mediocregopher/mediocre-go-lib/mctx"
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"github.com/mediocregopher/mediocre-go-lib/merr"
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"github.com/mediocregopher/mediocre-go-lib/mlog"
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"github.com/mediocregopher/mediocre-go-lib/mrun"
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)
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// SQL is a wrapper around a sqlx client which provides more functionality.
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type SQL struct {
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*sqlx.DB
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cmp *mcmp.Component
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}
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// InstMySQL returns a SQL instance which will be initialized when the Init
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// event is triggered on the given Component. The SQL instance will have Close
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// called on it when the Shutdown event is triggered on the given Component.
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//
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// defaultDB indicates the name of the database in MySQL to use by default,
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// though it will be overwritable in the config.
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func InstMySQL(cmp *mcmp.Component, defaultDB string) *SQL {
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sql := SQL{cmp: cmp.Child("mysql")}
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addr := mcfg.String(sql.cmp, "addr",
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mcfg.ParamDefault("[::1]:3306"),
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mcfg.ParamUsage("Address where MySQL server can be found"))
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user := mcfg.String(sql.cmp, "user",
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mcfg.ParamDefault("root"),
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mcfg.ParamUsage("User to authenticate to MySQL server as"))
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pass := mcfg.String(sql.cmp, "password",
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mcfg.ParamUsage("Password to authenticate to MySQL server with"))
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db := mcfg.String(sql.cmp, "database",
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mcfg.ParamDefault(defaultDB),
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mcfg.ParamUsage("MySQL database to use"))
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mrun.InitHook(sql.cmp, func(ctx context.Context) error {
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sql.cmp.Annotate("addr", *addr, "user", *user)
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dsn := fmt.Sprintf("%s:%s@tcp(%s)/%s", *user, *pass, *addr, *db)
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mlog.From(sql.cmp).Debug("constructed dsn", mctx.Annotate(ctx, "dsn", dsn))
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mlog.From(sql.cmp).Info("connecting to MySQL server", ctx)
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var err error
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sql.DB, err = sqlx.ConnectContext(ctx, "mysql", dsn)
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return merr.Wrap(err, sql.cmp.Context(), ctx)
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})
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mrun.ShutdownHook(sql.cmp, func(ctx context.Context) error {
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mlog.From(sql.cmp).Info("closing connection to MySQL server", ctx)
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return merr.Wrap(sql.Close(), sql.cmp.Context(), ctx)
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})
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return &sql
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}
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// Context returns the annotated Context from this instance's initialization.
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func (sql *SQL) Context() context.Context {
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return sql.cmp.Context()
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}
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