4b95d47923
This PR builds up on the pass-through DB driver to a fully functioning DB driver implementation via our RPC layer. To keep things separate from the plugin RPC API, and have the ability to move fast with changes, a separate field Driver is added to MattermostPlugin. Typically the field which is required to be compatible are the API and Helpers. It would be well-documented that Driver is purely for internal use by Mattermost plugins. A new Driver interface was created which would have a client and server implementation. Every object (connection, statement, etc.) is created and added to a map on the server side. On the client side, the wrapper structs hold the object id, and communicate via the RPC API using this id. When the server gets the object id, it picks up the appropriate object from its map and performs the operation, and sends back the data. Some things that need to be handled are errors. Typical error types like pq.Error and mysql.MySQLError are registered with encoding/gob. But for error variables like sql.ErrNoRows, a special integer is encoded with the ErrorString struct. And on the cilent side, the integer is checked, and the appropriate error variable is returned. Some pending things: - Context support. This is tricky. Since context.Context is an interface, it's not possible to marshal it. We have to find a way to get the timeout value from the context and pass it. - RowsColumnScanType(rowsID string, index int) reflect.Type API. Again, reflect.Type is an interface. - Master/Replica API support.
62 строки
1.5 KiB
Go
62 строки
1.5 KiB
Go
// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
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// See LICENSE.txt for license information.
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package plugin
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import (
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"github.com/hashicorp/go-plugin"
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)
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const (
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InternalKeyPrefix = "mmi_"
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BotUserKey = InternalKeyPrefix + "botid"
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)
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// Starts the serving of a Mattermost plugin over net/rpc. gRPC is not yet supported.
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//
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// Call this when your plugin is ready to start.
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func ClientMain(pluginImplementation interface{}) {
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if impl, ok := pluginImplementation.(interface {
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SetAPI(api API)
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SetHelpers(helpers Helpers)
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SetDriver(driver Driver)
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}); !ok {
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panic("Plugin implementation given must embed plugin.MattermostPlugin")
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} else {
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impl.SetAPI(nil)
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impl.SetHelpers(nil)
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impl.SetDriver(nil)
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}
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pluginMap := map[string]plugin.Plugin{
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"hooks": &hooksPlugin{hooks: pluginImplementation},
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}
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plugin.Serve(&plugin.ServeConfig{
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HandshakeConfig: handshake,
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Plugins: pluginMap,
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})
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}
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type MattermostPlugin struct {
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// API exposes the plugin api, and becomes available just prior to the OnActive hook.
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API API
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Helpers Helpers
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Driver Driver
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}
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// SetAPI persists the given API interface to the plugin. It is invoked just prior to the
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// OnActivate hook, exposing the API for use by the plugin.
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func (p *MattermostPlugin) SetAPI(api API) {
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p.API = api
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}
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// SetHelpers does the same thing as SetAPI except for the plugin helpers.
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func (p *MattermostPlugin) SetHelpers(helpers Helpers) {
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p.Helpers = helpers
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}
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func (p *MattermostPlugin) SetDriver(driver Driver) {
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p.Driver = driver
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}
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