feat: add support for maxLatency (#76)

* add support for maxLatency

* revert

* revert

* update readme

* address comments

* Update package version to 2.20.0

Author: cctdaniel

Diff for: CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 2.20.0
+
+- Add `messageSent` field to `PriceData`
+- Add `maxLatency` field to `PriceData`
+
 ## 2.19.0
 
 - Upgrade `@coral-xyz/anchor` to `^0.28.1-beta.1`

Diff for: package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@pythnetwork/client",
-  "version": "2.19.0",
+  "version": "2.20.0",
   "description": "Client for consuming Pyth price data",
   "homepage": "https://pyth.network",
   "main": "lib/index.js",

Diff for: package.json

@@ -598,6 +598,48 @@
           "type": "publicKey"
         }
       ]
+    },
+    {
+      "name": "setMaxLatency",
+      "discriminant": { "value": [2, 0, 0, 0, 18, 0, 0, 0] },
+      "accounts": [
+        {
+          "name": "fundingAccount",
+          "isMut": true,
+          "isSigner": true
+        },
+        {
+          "name": "priceAccount",
+          "isMut": true,
+          "isSigner": false
+        },
+        {
+          "name": "permissionsAccount",
+          "isMut": false,
+          "isSigner": false,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "type": "string",
+                "value": "permissions"
+              }
+            ]
+          }
+        }
+      ],
+      "args": [
+        {
+          "name": "maxLatency",
+          "type": "u8"
+        },
+        {
+          "name": "unused",
+          "type": {
+            "array": ["u8", 3]
+          }
+        }
+      ]
     }
   ],
   "types": [

Diff for: src/anchor/idl.json

@@ -1,5 +1,5 @@
+import { AnchorProvider, Idl, Program } from '@coral-xyz/anchor'
 import { PublicKey } from '@solana/web3.js'
-import { Program, AnchorProvider, Idl } from '@coral-xyz/anchor'
 import { PythOracleCoder } from './coder'
 import IDL from './idl.json'
 
@@ -619,6 +619,48 @@ export type PythOracle = {
         },
       ]
     },
+    {
+      name: 'setMaxLatency'
+      discriminant: { value: [2, 0, 0, 0, 18, 0, 0, 0] }
+      accounts: [
+        {
+          name: 'fundingAccount'
+          isMut: true
+          isSigner: true
+        },
+        {
+          name: 'priceAccount'
+          isMut: true
+          isSigner: false
+        },
+        {
+          name: 'permissionsAccount'
+          isMut: false
+          isSigner: false
+          pda: {
+            seeds: [
+              {
+                kind: 'const'
+                type: 'string'
+                value: 'permissions'
+              },
+            ]
+          }
+        },
+      ]
+      args: [
+        {
+          name: 'maxLatency'
+          type: 'u8'
+        },
+        {
+          name: 'unused'
+          type: {
+            array: ['u8', 3]
+          }
+        },
+      ]
+    },
   ]
   types: [
     {

Diff for: src/anchor/program.ts

@@ -103,7 +103,8 @@ export interface PriceData extends Base {
   emaConfidence: Ema
   timestamp: bigint
   minPublishers: number
-  drv2: number
+  messageSent: number
+  maxLatency: number
   drv3: number
   drv4: number
   productAccountKey: PublicKey
@@ -285,10 +286,12 @@ export const parsePriceData = (data: Buffer, currentSlot?: number): PriceData =>
   const timestamp = readBigInt64LE(data, 96)
   // minimum number of publishers for status to be TRADING
   const minPublishers = data.readUInt8(104)
+  // message sent flag
+  const messageSent = data.readUInt8(105)
+  // configurable max latency in slots between send and receive
+  const maxLatency = data.readUInt8(106)
   // space for future derived values
-  const drv2 = data.readInt8(105)
-  // space for future derived values
-  const drv3 = data.readInt16LE(106)
+  const drv3 = data.readInt8(107)
   // space for future derived values
   const drv4 = data.readInt32LE(108)
   // product id / reference account
@@ -350,7 +353,8 @@ export const parsePriceData = (data: Buffer, currentSlot?: number): PriceData =>
     emaConfidence,
     timestamp,
     minPublishers,
-    drv2,
+    messageSent,
+    maxLatency,
     drv3,
     drv4,
     productAccountKey,
@@ -394,5 +398,5 @@ export const parsePermissionData = (data: Buffer): PermissionData => {
 
 export { PythConnection } from './PythConnection'
 export { PythHttpClient } from './PythHttpClient'
-export { getPythProgramKeyForCluster, PythCluster, getPythClusterApiUrl } from './cluster'
-export { pythOracleProgram, pythOracleCoder, pythIdl } from './anchor'
+export { pythIdl, pythOracleCoder, pythOracleProgram } from './anchor'
+export { PythCluster, getPythClusterApiUrl, getPythProgramKeyForCluster } from './cluster'