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PromLens.tsx
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PromLens.tsx
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import React, { FC, useState, useEffect } from 'react';
import { Container, Alert } from 'react-bootstrap';
import { createStore } from 'redux';
import { importState, setServerSettings, setExpr } from '../state/actions';
import appReducer, { ExportedStateV1, ExportedStateV2orV3 } from '../state/reducers';
import { Provider } from 'react-redux';
import PromLensUI from '../PromLens/PromLensUI';
import { PageConfig, PathPrefixProps } from '../types/types';
import { grafanaDatasourceToServerSettings } from '../state/utils';
import { nodeType, valueType, matchType } from '../promql/ast';
import { functionSignatures } from '../promql/functionSignatures';
const store = createStore(appReducer);
// Extracted from https://promlens.com/api/page_config?l=OTuO7josUeU.
const examplePageState = {
nodeVisualizer: { activeTab: 'graph', endTime: null, range: 7200000, resolution: null, stacked: false },
queries: [
{
ast: {
args: [
{ type: 'numberLiteral', val: '0.9' },
{
expr: {
args: [
{
matchers: [{ name: '__name__', type: '=', value: 'demo_api_request_duration_seconds_bucket' }],
name: 'demo_api_request_duration_seconds_bucket',
offset: 0,
range: 300000,
type: 'matrixSelector',
},
],
func: { argTypes: ['matrix'], name: 'rate', returnType: 'vector', variadic: 0 },
type: 'call',
},
grouping: ['le', 'method', 'path'],
op: 'sum',
param: null,
type: 'aggregation',
without: false,
},
],
func: { argTypes: ['scalar', 'vector'], name: 'histogram_quantile', returnType: 'vector', variadic: 0 },
type: 'call',
},
expr: 'histogram_quantile(0.9, sum by(le, method, path) (rate(demo_api_request_duration_seconds_bucket[5m])))',
exprStale: false,
},
{
ast: {
bool: false,
lhs: {
expr: {
args: [
{
matchers: [{ name: '__name__', type: '=', value: 'node_cpu_seconds_total' }],
name: 'node_cpu_seconds_total',
offset: 0,
range: 60000,
type: 'matrixSelector',
},
],
func: { argTypes: ['matrix'], name: 'rate', returnType: 'vector', variadic: 0 },
type: 'call',
},
grouping: ['job', 'mode'],
op: 'sum',
param: null,
type: 'aggregation',
without: false,
},
matching: { card: 'many-to-one', include: [], labels: ['job'], on: true },
op: '/',
rhs: {
expr: {
args: [
{
matchers: [{ name: '__name__', type: '=', value: 'node_cpu_seconds_total' }],
name: 'node_cpu_seconds_total',
offset: 0,
range: 60000,
type: 'matrixSelector',
},
],
func: { argTypes: ['matrix'], name: 'rate', returnType: 'vector', variadic: 0 },
type: 'call',
},
grouping: ['job'],
op: 'sum',
param: null,
type: 'aggregation',
without: false,
},
type: 'binaryExpr',
},
expr: 'sum by(job, mode) (rate(node_cpu_seconds_total[1m])) / on(job) group_left sum by(job)(rate(node_cpu_seconds_total[1m]))',
exprStale: false,
},
],
selectedNodeIdx: { nodeIdx: 3, queryID: 1 },
serverURL: 'https://demo.promlabs.com',
version: 1,
} as ExportedStateV1;
const PromLens: FC<PathPrefixProps> = ({ pathPrefix }) => {
const [pageConfig, setPageConfig] = useState<PageConfig | null>(null);
const [pageConfigLoading, setPageConfigLoading] = useState<boolean>(true);
const [pageConfigError, setPageConfigError] = useState<string | null>(null);
const [stateImportError, setStateImportError] = useState<string | null>(null);
const queryParams = Object.fromEntries(
window.location.search
.substring(1)
.split('&')
.map((p) => p.split('='))
.map(([a, b]) => [a, decodeURIComponent(b)])
);
// Load the initial page configuration, datasources, and shared page state.
useEffect(() => {
let statusCode = 0;
let statusText = '';
fetch(`${pathPrefix}/api/page_config?l=${queryParams.l || ''}`)
.then((res) => {
statusCode = res.status;
statusText = res.statusText;
if (statusCode !== 200) {
return res.text();
}
return res.json();
})
.then((res) => {
if (statusCode !== 200) {
throw new Error(`${statusText}${res !== '' ? `: ${res}` : ''}`);
}
return res;
})
.then((pageConfig: PageConfig) => {
if (queryParams.example !== undefined) {
pageConfig.pageState = examplePageState;
}
// Precedence override order:
//
// - command-line default
// - page state from shared link
// - explicit "?s=<server-url>" override
// - explicit "?ds=<datasource-id>" override
// If a command-line default server is present, set that first.
if (pageConfig.defaultPrometheusURL !== '') {
store.dispatch(
setServerSettings({
access: 'direct',
datasourceID: null,
withCredentials: false,
url: pageConfig.defaultPrometheusURL,
})
);
}
// Import entire page state from shared link reference.
if (pageConfig.pageState !== null) {
try {
store.dispatch(importState(pageConfig.pageState as ExportedStateV1 | ExportedStateV2orV3));
// TODO: Somewhat duplicated with access in PromLensUI.
localStorage.setItem('promlens.show-example-page-link', 'false');
} catch (error) {
setStateImportError((error as Error).message);
}
} else {
// If no initial page state is provided and Grafana datasources contain a default server,
// select it.
const defaultDS = pageConfig.grafanaDatasources.find((ds) => ds.isDefault);
if (defaultDS !== undefined) {
store.dispatch(setServerSettings(grafanaDatasourceToServerSettings(defaultDS)));
}
}
// Override Prometheus server from URL for direct access.
if (queryParams.s) {
store.dispatch(
setServerSettings({
access: 'direct',
datasourceID: null,
withCredentials: false,
url: queryParams.s,
})
);
}
// Override Prometheus server from URL for proxy access.
if (queryParams.ds) {
const providedDS = pageConfig.grafanaDatasources.find((ds) => ds.id === Number(queryParams.ds));
if (providedDS !== undefined) {
store.dispatch(setServerSettings(grafanaDatasourceToServerSettings(providedDS)));
} else {
setPageConfigError('No Grafana datasource found with ID provided in the url parameter');
}
}
// Override the expression of the first query from the URL.
if (queryParams.q) {
store.dispatch(setExpr(0, queryParams.q));
}
setPageConfig(pageConfig);
})
.catch((err) => setPageConfigError(err.message))
.finally(() => setPageConfigLoading(false));
}, [queryParams.l, queryParams.s, queryParams.ds, pathPrefix]);
return (
<Container fluid className="promlens-container">
{pageConfigLoading && <Alert variant="secondary">Loading page configuration...</Alert>}
{pageConfigError && (
<Alert variant="danger">
<strong>Loading page configuration failed:</strong> {pageConfigError}
</Alert>
)}
{stateImportError && (
<Alert variant="danger">
<strong>Importing shared page state failed:</strong> {stateImportError}
</Alert>
)}
{stateImportError === null && pageConfigError === null && pageConfig !== null && (
<Provider store={store}>
<PromLensUI initialTrigger={!!queryParams.q} pathPrefix={pathPrefix} datasources={pageConfig.grafanaDatasources} />
</Provider>
)}
</Container>
);
};
export default PromLens;