大盤分析訂閱
生產環境:
https://stream.valuescan.ai
一、概述
大盤分析是 ValueAgent 透過多維度資料,對 BTC/ETH 的行情進行綜合分析的輸出結果。大盤訂閱是一種伺服端主動推送機制,使用者訂閱後,當大盤行情發生變化時,伺服端透過 SSE 通道主動推送分析文字到用戶端。
二、訂閱位址
GET https://stream.valuescan.ai/stream/market/subscribe鑑權參數(Query String):
| 參數 | 類型 | 必填 | 說明 |
|---|---|---|---|
apiKey | string | 是 | ValueScan Access Key |
sign | string | 是 | HMAC-SHA256 簽名 |
timestamp | long | 是 | 毫秒級 Unix 時間戳 |
nonce | string | 是 | 隨機字串(防重放) |
簽名演算法:
sign = HMAC-SHA256(SK, timestamp 毫秒 + nonce)三、SSE 事件格式
連線成功
event: connected
data: subscribed心跳(維持連線)
: heartbeat
event: heartbeat
data: ping伺服端每 20 秒發送一次心跳。
大盤分析推送
event: market
data: {"ts":1775604300144,"uniqueId":"大盤分析_20260408103000","content":"BTC 主導市場,資金集中度高,建議關注 BTC 走勢。"}market 事件 payload 欄位:
| 欄位 | 類型 | 說明 |
|---|---|---|
ts | long | 推送時間(毫秒時間戳) |
uniqueId | string | 唯一識別(用於去重) |
content | string | 大盤分析純文字內容 |
四、訂閱範例
Python
python
import hashlib
import hmac
import json
import time
import uuid
import urllib.request
from urllib.parse import urlencode
AK = "your-access-key"
SK = "your-secret-key"
ts = int(time.time() * 1000)
nonce = uuid.uuid4().hex
sign = hmac.new(
SK.encode(),
(str(ts) + nonce).encode(),
hashlib.sha256,
).hexdigest()
params = urlencode({
"apiKey": AK,
"sign": sign,
"timestamp": ts,
"nonce": nonce,
})
url = f"https://stream.valuescan.ai/stream/market/subscribe?{params}"
req = urllib.request.Request(url, headers={"Accept": "text/event-stream"})
with urllib.request.urlopen(req, timeout=300) as resp:
event_name = ""
data_str = ""
for raw in resp:
line = raw.decode("utf-8").rstrip("\r\n")
if line.startswith(":"):
print("♥ 心跳")
continue
if line == "":
if data_str:
handle_event(event_name, data_str)
event_name = ""
data_str = ""
elif line.startswith("event:"):
event_name = line[6:].strip()
elif line.startswith("data:"):
data_str = line[5:].strip()
def handle_event(event_name: str, data_str: str) -> None:
if event_name == "connected":
print(f"[連線] {data_str}")
elif event_name == "market":
payload = json.loads(data_str)
ts = payload["ts"]
content = payload["content"]
dt = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(ts / 1000))
print(f"[大盤分析 {dt}] {content}")cURL(快速驗證)
bash
python3 -c "
import hashlib, hmac, time, uuid, urllib.parse
SK='your-secret-key'
ts=int(time.time()*1000)
nonce=uuid.uuid4().hex
sign=hmac.new(SK.encode(), (str(ts)+nonce).encode(), hashlib.sha256).hexdigest()
params=urllib.parse.urlencode({'apiKey':'your-access-key','sign':sign,'timestamp':ts,'nonce':nonce})
print(f"curl -N 'https://stream.valuescan.ai/stream/market/subscribe?{params}' -H 'Accept: text/event-stream'")
'"五、斷線重連
與訊號訂閱一致,建議實作指數退避重連:
python
def listen_with_retry(url: str, max_retries: int = 10) -> None:
retries = 0
while retries <= max_retries:
try:
req = urllib.request.Request(url, headers={"Accept": "text/event-stream"})
with urllib.request.urlopen(req, timeout=300) as resp:
_read_sse(resp)
break
except KeyboardInterrupt:
print("使用者中斷,結束。")
break
except Exception as e:
retries += 1
wait = min(2 ** retries, 60)
print(f"連線中斷({e}),{wait} 秒後第 {retries} 次重新連線...")
time.sleep(wait)
else:
print("重試次數已用盡,結束。")六、錯誤碼
| HTTP 狀態碼 | 說明 |
|---|---|
| 200 | 連線成功 |
| 400 | 參數缺失或格式錯誤 |
| 401 | 簽名驗證失敗或時間戳超限 |
| 404 | 訂閱位址錯誤 |
| 503 | 伺服端不可用(鑑權後端連線失敗) |