feat(jellyfish-api-core): add net getNetTotals RPC (#1843)

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#### What this PR does / why we need it:
/kind feature

#### Which issue(s) does this PR fixes?:
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Fixes part of #48 
- Implements `getnettotals` type for RPC.

Signed-off-by: Mark Tan <35588098+marktanrj@users.noreply.github.com>
Co-authored-by: Fuxing Loh <4266087+fuxingloh@users.noreply.github.com>

docs/node/CATEGORIES/03-net.md

@@ -69,6 +69,32 @@ export interface PeerInfo {
 }
 ```
 
+## getNetTotals
+
+Returns information about network traffic, including bytes in, bytes out, and current time.
+
+```ts title="client.net.getNetTotals()"
+interface net {
+  getNetTotals (): Promise<NetTotals>
+}
+
+interface NetTotals {
+  totalbytesrecv: number
+  totalbytessent: number
+  timemillis: number
+  uploadtarget: UploadTarget
+}
+
+interface UploadTarget {
+  timeframe: number
+  target: number
+  target_reached: boolean
+  serve_historical_blocks: boolean
+  bytes_left_in_cycle: number
+  time_left_in_cycle: number
+}
+```
+
 ## getNetworkInfo
 
 Returns an object containing various state info regarding P2P networking.

packages/jellyfish-api-core/__tests__/category/net/getNetTotals.test.ts

@@ -0,0 +1,66 @@
+import { MasterNodeRegTestContainer, RegTestContainer } from '@defichain/testcontainers/dist/index'
+import { net } from '../../../src'
+import { ContainerAdapterClient } from '../../container_adapter_client'
+
+describe('Network without masternode', () => {
+  const container = new RegTestContainer()
+  const client = new ContainerAdapterClient(container)
+
+  beforeAll(async () => {
+    await container.start()
+  })
+
+  afterAll(async () => {
+    await container.stop()
+  })
+
+  it('should getNetTotals', async () => {
+    const info: net.NetTotals = await client.net.getNetTotals()
+
+    expect(info).toStrictEqual({
+      totalbytesrecv: expect.any(Number),
+      totalbytessent: expect.any(Number),
+      timemillis: expect.any(Number),
+      uploadtarget: {
+        timeframe: expect.any(Number),
+        target: expect.any(Number),
+        target_reached: expect.any(Boolean),
+        serve_historical_blocks: expect.any(Boolean),
+        bytes_left_in_cycle: expect.any(Number),
+        time_left_in_cycle: expect.any(Number)
+      }
+    })
+  })
+})
+
+describe('Network on masternode', () => {
+  const container = new MasterNodeRegTestContainer()
+  const client = new ContainerAdapterClient(container)
+
+  beforeAll(async () => {
+    await container.start()
+    await container.generate(1)
+  })
+
+  afterAll(async () => {
+    await container.stop()
+  })
+
+  it('should getNetTotals', async () => {
+    const info: net.NetTotals = await client.net.getNetTotals()
+
+    expect(info).toStrictEqual({
+      totalbytesrecv: expect.any(Number),
+      totalbytessent: expect.any(Number),
+      timemillis: expect.any(Number),
+      uploadtarget: {
+        timeframe: expect.any(Number),
+        target: expect.any(Number),
+        target_reached: expect.any(Boolean),
+        serve_historical_blocks: expect.any(Boolean),
+        bytes_left_in_cycle: expect.any(Number),
+        time_left_in_cycle: expect.any(Number)
+      }
+    })
+  })
+})

packages/jellyfish-api-core/src/category/net.ts

@@ -28,6 +28,15 @@ export class Net {
     return await this.client.call('getpeerinfo', [], 'number')
   }
 
+  /**
+   * Returns information about network traffic, including bytes in, bytes out, and current time.
+   *
+   * @return {Promise<NetTotals>}
+   */
+  async getNetTotals (): Promise<NetTotals> {
+    return await this.client.call('getnettotals', [], 'number')
+  }
+
   /**
    * Returns an object containing various state info regarding P2P networking.
    *
@@ -113,3 +122,19 @@ export interface LocalAddress {
   port: number
   score: number
 }
+
+export interface NetTotals {
+  totalbytesrecv: number
+  totalbytessent: number
+  timemillis: number
+  uploadtarget: UploadTarget
+}
+
+export interface UploadTarget {
+  timeframe: number
+  target: number
+  target_reached: boolean
+  serve_historical_blocks: boolean
+  bytes_left_in_cycle: number
+  time_left_in_cycle: number
+}