Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { asString, sdk } from '../../../index.client'
import { BaseBlockHeader, BlockHeader, isBaseBlockHeader } from './BlockHeaderApi'
interface FetchStatus<T> {
status: 'success' | 'error',
code?: string,
description?: string,
value?: T
}
export interface ChaintracksServiceClientOptions {
useAuthrite: boolean
}
/**
* Connects to a ChaintracksService to implement 'ChaintracksClientApi'
*
*/
export class ChaintracksServiceClient {
static createChaintracksServiceClientOptions(): ChaintracksServiceClientOptions {
const options: ChaintracksServiceClientOptions = {
useAuthrite: false
}
return options
}
options: ChaintracksServiceClientOptions
constructor(public chain: sdk.Chain, public serviceUrl: string, options?: ChaintracksServiceClientOptions) {
this.options = options || ChaintracksServiceClient.createChaintracksServiceClientOptions()
}
async currentHeight(): Promise<number> {
return await this.getPresentHeight()
}
async isValidRootForHeight(root: string, height: number): Promise<boolean> {
const r = await this.findHeaderForHeight(height)
Iif (!r) return false
const isValid = root === asString(r.merkleRoot)
return isValid
}
async getJsonOrUndefined<T>(path: string): Promise<T | undefined> {
let e: Error | undefined = undefined
for (let retry = 0; retry < 3; retry++) {
try {
const r = await fetch(`${this.serviceUrl}${path}`)
const v = <FetchStatus<T>>await r.json()
if (v.status === 'success')
return v.value
else
e = new Error(JSON.stringify(v))
} catch (eu: unknown) {
e = eu as Error
}
if (e && e.name !== 'ECONNRESET')
break
}
if (e) throw e
}
async getJson<T>(path: string): Promise<T> {
const r = await this.getJsonOrUndefined<T>(path)
Iif (r === undefined)
throw new Error('Value was undefined. Requested object may not exist.')
return r
}
async postJsonVoid<T>(path: string, params: T): Promise<void> {
const headers = {}
headers['Content-Type'] = 'application/json'
const r = await fetch(`${this.serviceUrl}${path}`, {
body: JSON.stringify(params),
method: 'POST',
headers,
//cache: 'no-cache',
})
try {
const s = <FetchStatus<void>>await r.json()
Iif (s.status === 'success')
return
throw new Error(JSON.stringify(s))
} catch (e) {
console.log(`Exception: ${JSON.stringify(e)}`)
throw new Error(JSON.stringify(e))
}
}
//
// HTTP API FUNCTIONS
//
async addHeader(header: BaseBlockHeader): Promise<void> {
const r = await this.postJsonVoid('/addHeaderHex', header)
Iif (typeof r === 'string')
throw new Error(r)
}
async startListening(): Promise<void> {
return await this.getJsonOrUndefined('/startListening')
}
async listening(): Promise<void> { return await this.getJsonOrUndefined('/listening') }
async getChain(): Promise<sdk.Chain> {
return this.chain
//return await this.getJson('/getChain')
}
async isListening(): Promise<boolean> { return await this.getJson('/isListening') }
async isSynchronized(): Promise<boolean> { return await this.getJson('/isSynchronized') }
async getPresentHeight(): Promise<number> { return await this.getJson('/getPresentHeight') }
async findChainTipHeader(): Promise<BlockHeader> { return await this.getJson('/findChainTipHeaderHex') }
async findChainTipHashHex(): Promise<string> { return await this.getJson('/findChainTipHashHex') }
async getHeaders(height: number, count: number): Promise<string> {
return await this.getJson(`/getHeaders?height=${height}&count=${count}`)
}
async findHeaderForHeight(height: number): Promise<BlockHeader | undefined> {
return await this.getJsonOrUndefined(`/findHeaderHexForHeight?height=${height}`)
}
async findChainWorkForBlockHash(hash: string): Promise<string | undefined> {
return await this.getJsonOrUndefined(`/findChainWorkHexForBlockHash?hash=${asString(hash)}`)
}
async findHeaderForBlockHash(hash: string): Promise<BlockHeader | undefined> {
return await this.getJsonOrUndefined(`/findHeaderHexForBlockHash?hash=${asString(hash)}`)
}
async findHeaderForMerkleRoot(merkleRoot: string, height?: number): Promise<BlockHeader | undefined> {
return await this.getJsonOrUndefined(`/findHeaderHexForMerkleRoot?root=${asString(merkleRoot)}&height=${height}`)
}
}
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