Fixes and testing scripts.

package.json

@@ -0,0 +1,18 @@
+{
+  "name": "pyth-exp",
+  "version": "1.0.0",
+  "description": "Experimentation with pyth",
+  "main": "index.js",
+  "scripts": {
+    "test": "mocha"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@pythnetwork/client": "^2.3.1",
+    "algosdk": "^1.11.1"
+  },
+  "devDependencies": {
+    "mocha": "^9.1.2"
+  }
+}

scripts/create-app.cmd

@@ -0,0 +1,3 @@
+goal clerk compile teal\pricedata.teal.tmpl -o teal\pricedata.teal.bin
+goal app create --out create-app.txn --creator  OPDM7ACAW64Q4VBWAL77Z5SHSJVZZ44V3BAN7W44U43SUXEOUENZMZYOQU --local-byteslices 0 --local-ints 0 --global-byteslices 3 --global-ints 2 --approval-prog-raw teal\pricedata.teal.bin --clear-prog teal\clearstate.teal
+algokey sign -t create-app.txn -m "assault approve result rare float sugar power float soul kind galaxy edit unusual pretty tone tilt net range pelican avoid unhappy amused recycle abstract master" -o create-app.stxn

scripts/test_message.ts

@@ -0,0 +1,39 @@
+import algosdk, { signBytes } from 'algosdk'
+import { Buffer } from 'buffer'
+import { writeFileSync } from 'fs'
+
+// OPDM7ACAW64Q4VBWAL77Z5SHSJVZZ44V3BAN7W44U43SUXEOUENZMZYOQU
+const mnemo = 'assault approve result rare float sugar power float soul kind galaxy edit unusual pretty tone tilt net range pelican avoid unhappy amused recycle abstract master'
+
+const appId = BigInt(0x123456789)
+const nonce = BigInt(0x1000)
+const symbol = "BTC/USD         "
+const price = 45278.65
+const sd = 8.00000000004
+
+// Create message
+const buf = Buffer.alloc(131)
+buf.write('PRICEDATA',0)
+// v
+buf.writeInt8(1, 9)
+// dest
+buf.writeBigUInt64BE(appId, 10)
+// nonce
+buf.writeBigUInt64BE(nonce, 18)
+// symbol
+buf.write(symbol, 26)
+// price 
+buf.writeDoubleBE(price, 42)
+// sd
+buf.writeDoubleBE(sd, 50)
+// ts
+buf.writeBigUInt64BE(BigInt(Date.now()), 58)
+
+const signature = Buffer.from(algosdk.signBytes(buf, algosdk.mnemonicToSecretKey(mnemo).sk))
+signature.copy(buf, 66)
+
+// v-component (ignored in Algorand it seems)
+buf.writeInt8(1, 130)
+
+writeFileSync('msg.bin', buf)
+writeFileSync('msg.b64', buf.toString('base64'))

teal/clearstate.teal

@@ -0,0 +1,3 @@
+#pragma version 5
+int 1
+return

teal/pricedata.teal.tmpl

@@ -1,6 +1,6 @@
 #pragma version 5
 // ================================================================================================
-// Price-Reference Program 
+// Pricecaster Program 
 // ================================================================================================
 //
 // This contract has the following invariants at
@@ -9,11 +9,11 @@
 // TMPL_VALIDATOR Unique data validator address that signs and sends the incoming message
 //
 // App-globals:
-// symbol   : pair supported by this app.
-// nonce    : last sequence ID
-// price    : current price 
-// stdev    : current confidence (standard deviation)
-// ts       : timestamp
+// symbol   : byte[] pair supported by this app.
+// nonce    : uint64 last sequence ID
+// price    : byte[] current price 
+// stdev    : byte[] current confidence (standard deviation)
+// ts       : uint64 timestamp
 //
 // Slots:
 // 0        Input message block 
@@ -22,17 +22,17 @@
 // The Message format must have the packed fields:
 // 
 //  Field size
-//  10          header      Literal "PRICE_DATA"
+//  9           header      Literal "PRICEDATA"
 //  1           version     int8 (Must be 1)
 //  8           dest        This appId 
 //  8           nonce       uint64 Sequence identifier 
 //  16          symbol      String filled with spaces e.g ("ALGO/USD        ")
-//  8           price       uint64 encoded price
-//  8           conf        uint64 encoded confidence (kind of SD) 
+//  8           price       Price. 64bit float encoded as big-endian.
+//  8           conf        Confidence (standard-deviation?). 64bit float encoded as big-endian. 
 //  8           ts          timestamp of this price
-//  32          r           Signature r-component
-//  32          s           Signature s-component 
-//  1           v           Signature v-component 
+//  32          s           Signature s-component
+//  32          r           Signature r-component 
+//  1           v           Signature v-component (ignored)
 //
 //  Size: 131 bytes. 
 //