mirror of
https://github.com/grafana/grafana.git
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108 lines
2.8 KiB
Go
108 lines
2.8 KiB
Go
package plugins
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import (
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"encoding/json"
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"fmt"
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"os"
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"os/exec"
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"path"
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"path/filepath"
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"runtime"
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"strings"
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"github.com/grafana/grafana/pkg/log"
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"github.com/grafana/grafana/pkg/models"
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"github.com/grafana/grafana/pkg/plugins/backend"
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"github.com/grafana/grafana/pkg/tsdb"
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shared "github.com/grafana/grafana/pkg/tsdb/models/proxy"
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plugin "github.com/hashicorp/go-plugin"
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)
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type DataSourcePlugin struct {
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FrontendPluginBase
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Annotations bool `json:"annotations"`
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Metrics bool `json:"metrics"`
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Alerting bool `json:"alerting"`
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QueryOptions map[string]bool `json:"queryOptions,omitempty"`
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BuiltIn bool `json:"builtIn,omitempty"`
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Mixed bool `json:"mixed,omitempty"`
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HasQueryHelp bool `json:"hasQueryHelp,omitempty"`
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Routes []*AppPluginRoute `json:"routes"`
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Backend bool `json:"backend,omitempty"`
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Executable string `json:"executable,omitempty"`
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log log.Logger
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client *plugin.Client
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}
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func (p *DataSourcePlugin) Load(decoder *json.Decoder, pluginDir string) error {
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if err := decoder.Decode(&p); err != nil {
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return err
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}
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if err := p.registerPlugin(pluginDir); err != nil {
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return err
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}
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// look for help markdown
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helpPath := filepath.Join(p.PluginDir, "QUERY_HELP.md")
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if _, err := os.Stat(helpPath); os.IsNotExist(err) {
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helpPath = filepath.Join(p.PluginDir, "query_help.md")
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}
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if _, err := os.Stat(helpPath); err == nil {
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p.HasQueryHelp = true
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}
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DataSources[p.Id] = p
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return nil
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}
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var handshakeConfig = plugin.HandshakeConfig{
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ProtocolVersion: 1,
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MagicCookieKey: "GRAFANA_BACKEND_DATASOURCE",
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MagicCookieValue: "55d2200a-6492-493a-9353-73b728d468aa",
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}
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func buildExecutablePath(pluginDir, executable, os, arch string) string {
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return path.Join(pluginDir, fmt.Sprintf("%s_%s_%s", executable, strings.ToLower(os), strings.ToLower(arch)))
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}
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func (p *DataSourcePlugin) initBackendPlugin(log log.Logger) error {
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p.log = log.New("plugin-id", p.Id)
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cmd := buildExecutablePath(p.PluginDir, p.Executable, runtime.GOOS, runtime.GOARCH)
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p.client = plugin.NewClient(&plugin.ClientConfig{
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HandshakeConfig: handshakeConfig,
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Plugins: map[string]plugin.Plugin{p.Id: &shared.TsdbPluginImpl{}},
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Cmd: exec.Command(cmd),
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AllowedProtocols: []plugin.Protocol{plugin.ProtocolGRPC},
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Logger: backend.LogWrapper{Logger: p.log},
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})
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rpcClient, err := p.client.Client()
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if err != nil {
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return err
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}
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raw, err := rpcClient.Dispense(p.Id)
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if err != nil {
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return err
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}
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plugin := raw.(shared.TsdbPlugin)
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tsdb.RegisterTsdbQueryEndpoint(p.Id, func(dsInfo *models.DataSource) (tsdb.TsdbQueryEndpoint, error) {
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return &shared.TsdbWrapper{TsdbPlugin: plugin}, nil
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})
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return nil
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}
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func (p *DataSourcePlugin) Kill() {
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if p.client != nil {
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p.client.Kill()
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}
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}
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