forked from grafana/grafana
/
metrics.go
255 lines (217 loc) · 8.2 KB
/
metrics.go
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package api
import (
"context"
"errors"
"net/http"
"github.com/grafana/grafana-plugin-sdk-go/backend"
"github.com/grafana/grafana/pkg/expr"
"github.com/grafana/grafana/pkg/models"
"github.com/grafana/grafana/pkg/plugins"
"github.com/grafana/grafana/pkg/api/dtos"
"github.com/grafana/grafana/pkg/api/response"
"github.com/grafana/grafana/pkg/bus"
"github.com/grafana/grafana/pkg/components/simplejson"
"github.com/grafana/grafana/pkg/util"
)
// QueryMetricsV2 returns query metrics.
// POST /api/ds/query DataSource query w/ expressions
func (hs *HTTPServer) QueryMetricsV2(c *models.ReqContext, reqDTO dtos.MetricRequest) response.Response {
if len(reqDTO.Queries) == 0 {
return response.Error(http.StatusBadRequest, "No queries found in query", nil)
}
timeRange := plugins.NewDataTimeRange(reqDTO.From, reqDTO.To)
request := plugins.DataQuery{
TimeRange: &timeRange,
Debug: reqDTO.Debug,
User: c.SignedInUser,
Queries: make([]plugins.DataSubQuery, 0, len(reqDTO.Queries)),
}
// Loop to see if we have an expression.
for _, query := range reqDTO.Queries {
if query.Get("datasource").MustString("") == expr.DatasourceName {
return hs.handleExpressions(c, reqDTO)
}
}
var ds *models.DataSource
for i, query := range reqDTO.Queries {
hs.log.Debug("Processing metrics query", "query", query)
datasourceID, err := query.Get("datasourceId").Int64()
if err != nil {
hs.log.Debug("Can't process query since it's missing data source ID")
return response.Error(http.StatusBadRequest, "Query missing data source ID", nil)
}
// For mixed datasource case, each data source is sent in a single request.
// So only the datasource from the first query is needed. As all requests
// should be the same data source.
if i == 0 {
ds, err = hs.DatasourceCache.GetDatasource(datasourceID, c.SignedInUser, c.SkipCache)
if err != nil {
return hs.handleGetDataSourceError(err, datasourceID)
}
}
request.Queries = append(request.Queries, plugins.DataSubQuery{
RefID: query.Get("refId").MustString("A"),
MaxDataPoints: query.Get("maxDataPoints").MustInt64(100),
IntervalMS: query.Get("intervalMs").MustInt64(1000),
QueryType: query.Get("queryType").MustString(""),
Model: query,
DataSource: ds,
})
}
err := hs.PluginRequestValidator.Validate(ds.Url, nil)
if err != nil {
return response.Error(http.StatusForbidden, "Access denied", err)
}
resp, err := hs.DataService.HandleRequest(c.Req.Context(), ds, request)
if err != nil {
return response.Error(http.StatusInternalServerError, "Metric request error", err)
}
// This is insanity... but ¯\_(ツ)_/¯, the current query path looks like:
// encodeJson( decodeBase64( encodeBase64( decodeArrow( encodeArrow(frame)) ) )
// this will soon change to a more direct route
qdr, err := resp.ToBackendDataResponse()
if err != nil {
return response.Error(http.StatusInternalServerError, "error converting results", err)
}
return toMacronResponse(qdr)
}
func toMacronResponse(qdr *backend.QueryDataResponse) response.Response {
statusCode := http.StatusOK
for _, res := range qdr.Responses {
if res.Error != nil {
statusCode = http.StatusBadRequest
}
}
return response.JSONStreaming(statusCode, qdr)
}
// handleExpressions handles POST /api/ds/query when there is an expression.
func (hs *HTTPServer) handleExpressions(c *models.ReqContext, reqDTO dtos.MetricRequest) response.Response {
timeRange := plugins.NewDataTimeRange(reqDTO.From, reqDTO.To)
request := plugins.DataQuery{
TimeRange: &timeRange,
Debug: reqDTO.Debug,
User: c.SignedInUser,
Queries: make([]plugins.DataSubQuery, 0, len(reqDTO.Queries)),
}
for _, query := range reqDTO.Queries {
hs.log.Debug("Processing metrics query", "query", query)
name := query.Get("datasource").MustString("")
datasourceID, err := query.Get("datasourceId").Int64()
if err != nil {
hs.log.Debug("Can't process query since it's missing data source ID")
return response.Error(400, "Query missing data source ID", nil)
}
if name != expr.DatasourceName {
// Expression requests have everything in one request, so need to check
// all data source queries for possible permission / not found issues.
if _, err = hs.DatasourceCache.GetDatasource(datasourceID, c.SignedInUser, c.SkipCache); err != nil {
return hs.handleGetDataSourceError(err, datasourceID)
}
}
request.Queries = append(request.Queries, plugins.DataSubQuery{
RefID: query.Get("refId").MustString("A"),
MaxDataPoints: query.Get("maxDataPoints").MustInt64(100),
IntervalMS: query.Get("intervalMs").MustInt64(1000),
QueryType: query.Get("queryType").MustString(""),
Model: query,
})
}
exprService := expr.Service{
Cfg: hs.Cfg,
DataService: hs.DataService,
}
qdr, err := exprService.WrapTransformData(c.Req.Context(), request)
if err != nil {
return response.Error(500, "expression request error", err)
}
return toMacronResponse(qdr)
}
func (hs *HTTPServer) handleGetDataSourceError(err error, datasourceID int64) *response.NormalResponse {
hs.log.Debug("Encountered error getting data source", "err", err, "id", datasourceID)
if errors.Is(err, models.ErrDataSourceAccessDenied) {
return response.Error(403, "Access denied to data source", err)
}
if errors.Is(err, models.ErrDataSourceNotFound) {
return response.Error(400, "Invalid data source ID", err)
}
return response.Error(500, "Unable to load data source metadata", err)
}
// QueryMetrics returns query metrics
// POST /api/tsdb/query
func (hs *HTTPServer) QueryMetrics(c *models.ReqContext, reqDto dtos.MetricRequest) response.Response {
if len(reqDto.Queries) == 0 {
return response.Error(http.StatusBadRequest, "No queries found in query", nil)
}
datasourceId, err := reqDto.Queries[0].Get("datasourceId").Int64()
if err != nil {
return response.Error(http.StatusBadRequest, "Query missing datasourceId", nil)
}
ds, err := hs.DatasourceCache.GetDatasource(datasourceId, c.SignedInUser, c.SkipCache)
if err != nil {
return hs.handleGetDataSourceError(err, datasourceId)
}
err = hs.PluginRequestValidator.Validate(ds.Url, nil)
if err != nil {
return response.Error(http.StatusForbidden, "Access denied", err)
}
timeRange := plugins.NewDataTimeRange(reqDto.From, reqDto.To)
request := plugins.DataQuery{
TimeRange: &timeRange,
Debug: reqDto.Debug,
User: c.SignedInUser,
}
for _, query := range reqDto.Queries {
request.Queries = append(request.Queries, plugins.DataSubQuery{
RefID: query.Get("refId").MustString("A"),
MaxDataPoints: query.Get("maxDataPoints").MustInt64(100),
IntervalMS: query.Get("intervalMs").MustInt64(1000),
Model: query,
DataSource: ds,
})
}
resp, err := hs.DataService.HandleRequest(c.Req.Context(), ds, request)
if err != nil {
return response.Error(http.StatusInternalServerError, "Metric request error", err)
}
statusCode := http.StatusOK
for _, res := range resp.Results {
if res.Error != nil {
res.ErrorString = res.Error.Error()
resp.Message = res.ErrorString
statusCode = http.StatusBadRequest
}
}
return response.JSON(statusCode, &resp)
}
// GET /api/tsdb/testdata/gensql
func GenerateSQLTestData(c *models.ReqContext) response.Response {
if err := bus.Dispatch(&models.InsertSQLTestDataCommand{}); err != nil {
return response.Error(500, "Failed to insert test data", err)
}
return response.JSON(200, &util.DynMap{"message": "OK"})
}
// GET /api/tsdb/testdata/random-walk
func (hs *HTTPServer) GetTestDataRandomWalk(c *models.ReqContext) response.Response {
from := c.Query("from")
to := c.Query("to")
intervalMS := c.QueryInt64("intervalMs")
timeRange := plugins.NewDataTimeRange(from, to)
request := plugins.DataQuery{TimeRange: &timeRange}
dsInfo := &models.DataSource{
Type: "testdata",
JsonData: simplejson.New(),
}
request.Queries = append(request.Queries, plugins.DataSubQuery{
RefID: "A",
IntervalMS: intervalMS,
Model: simplejson.NewFromAny(&util.DynMap{
"scenario": "random_walk",
}),
DataSource: dsInfo,
})
resp, err := hs.DataService.HandleRequest(context.Background(), dsInfo, request)
if err != nil {
return response.Error(500, "Metric request error", err)
}
return response.JSON(200, &resp)
}