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data.go
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data.go
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package data
import (
"context"
"fmt"
"strings"
"sync"
"github.com/choria-io/go-choria/internal/util"
"github.com/sirupsen/logrus"
"github.com/choria-io/go-choria/config"
"github.com/choria-io/go-choria/providers/data/ddl"
"github.com/choria-io/go-choria/server/agents"
)
type Query interface{}
type OutputItem interface{}
type Creator struct {
F func(Framework) (Plugin, error)
Name string
}
type Plugin interface {
Run(context.Context, Query, agents.ServerInfoSource) (map[string]OutputItem, error)
DLL() (*ddl.DDL, error)
}
type Framework interface {
Configuration() *config.Config
Logger(string) *logrus.Entry
}
type Manager struct {
plugins map[string]*Creator
ddls map[string]*ddl.DDL
fw Framework
ctx context.Context
log *logrus.Entry
}
var (
plugins map[string]*Creator
mu sync.Mutex
)
func NewManager(ctx context.Context, fw Framework) (*Manager, error) {
m := &Manager{
fw: fw,
plugins: make(map[string]*Creator),
ddls: make(map[string]*ddl.DDL),
log: fw.Logger("data_manager"),
ctx: ctx,
}
mu.Lock()
for k, p := range plugins {
pi, err := p.F(fw)
if err != nil {
m.log.Warnf("Could not create instance of data plugin %s", k)
continue
}
ddl, err := pi.DLL()
if err != nil {
m.log.Warnf("Could not load DDL for data plugin %s", k)
continue
}
m.plugins[k] = p
m.ddls[k] = ddl
m.log.Infof("Activated Data provider %s", k)
}
mu.Unlock()
return m, nil
}
func RegisterPlugin(name string, plugin *Creator) error {
mu.Lock()
defer mu.Unlock()
if plugins == nil {
plugins = make(map[string]*Creator)
}
_, ok := plugins[plugin.Name]
if ok {
return fmt.Errorf("data plugin %s is already registered", plugin.Name)
}
plugins[plugin.Name] = plugin
util.BuildInfo().RegisterDataProvider(name)
return nil
}
// DDLs is a list of DDLs for all known data plugins
func (m *Manager) DDLs() []*ddl.DDL {
res := []*ddl.DDL{}
for _, v := range m.ddls {
res = append(res, v)
}
return res
}
func (m *Manager) FuncMap(si agents.ServerInfoSource) (ddl.FuncMap, error) {
funcs := make(ddl.FuncMap)
for k, v := range m.ddls {
entry := ddl.FuncMapEntry{DDL: v, Name: v.Metadata.Name}
if v.Query == nil {
entry.F = m.arityZeroRunner(m.ctx, si, k, v, m.plugins[k])
} else {
entry.F = m.arityOneRunner(m.ctx, si, k, v, m.plugins[k])
}
funcs[k] = entry
}
return funcs, nil
}
func (m *Manager) arityZeroRunner(ctx context.Context, si agents.ServerInfoSource, name string, ddl *ddl.DDL, plugin *Creator) func() map[string]OutputItem {
return func() map[string]OutputItem {
f := m.arityOneRunner(ctx, si, name, ddl, plugin)
return f("")
}
}
func (m *Manager) arityOneRunner(ctx context.Context, si agents.ServerInfoSource, name string, ddl *ddl.DDL, plugin *Creator) func(q string) map[string]OutputItem {
return func(q string) map[string]OutputItem {
ctx, cancel := context.WithTimeout(ctx, ddl.Timeout())
defer cancel()
i, err := plugin.F(m.fw)
if err != nil {
m.log.Errorf("Could not create an instance of data provider %s: %s", name, err)
return nil
}
result, err := i.Run(ctx, q, si)
if err != nil {
m.log.Errorf("Could not run data provider %s: %s", name, err)
return nil
}
return result
}
}
func (m *Manager) Execute(ctx context.Context, plugin string, query string, srv agents.ServerInfoSource) (map[string]OutputItem, error) {
dpc, ok := m.plugins[plugin]
if !ok {
return nil, fmt.Errorf("unknown data plugin %s", plugin)
}
dp, err := dpc.F(m.fw)
if err != nil {
return nil, fmt.Errorf("could not create instance of data plugin %s: %s", plugin, err)
}
pddl, ok := m.ddls[plugin]
if !ok {
return nil, fmt.Errorf("could not find DDL for plugin %s", plugin)
}
var (
q interface{}
)
if pddl.Query != nil {
q, err = pddl.Query.ConvertStringValue(query)
if err != nil {
return nil, err
}
w, err := pddl.Query.ValidateValue(q)
if err != nil {
return nil, err
}
if len(w) > 0 {
return nil, fmt.Errorf("invalid query: %s", strings.Join(w, ", "))
}
}
timeout, cancel := context.WithTimeout(ctx, pddl.Timeout())
defer cancel()
return dp.Run(timeout, q, srv)
}