對于分布式追蹤，主要有以下的幾個概念：

追蹤 Trace：就是由分布的微服務(wù)協(xié)作所支撐的一個事務(wù)。一個追蹤，包含為該事務(wù)提供服務(wù)的各個服務(wù)請求。 跨度 Span：Span是事務(wù)中的一個工作流，一個Span包含了時間戳，日志和標(biāo)簽信息。Span之間包含父子關(guān)系，或者主從(Followup)關(guān)系。 跨度上下文 Span Context：跨度上下文是支撐分布式追蹤的關(guān)鍵，它可以在調(diào)用的服務(wù)之間傳遞，上下文的內(nèi)容包括諸如：從一個服務(wù)傳遞到另一個服務(wù)的時間，追蹤的ID，Span的ID還有其它需要從上游服務(wù)傳遞到下游服務(wù)的信息。

我實現(xiàn)了一種簡單的調(diào)用追蹤。

import uuidimport osimport timel = []class Recorder(object): def __init__(self,servername,root_span = None): if root_span == None: self.__span = Span(servername) else: self.__span = Span(servername,root_span) #上下文管理器 def __enter__(self): return self.__span # 退出方法中，用來實現(xiàn)善后處理工作 def __exit__(self, exc_type, exc_val, exc_tb): self.__span.record() self.__span.record_save(self.__span.span)class Span(object): def __init__(self,servername,root_span = None): self.servername = servername self.span = self.newspan() if root_span != None: root_span.dic[’child_span’] = self.span self.span['root_span_flag'] = False def newspan(self): self.dic = { 'spanid': uuid.uuid4().int, 'servername': self.servername, 'location': '', 'ip': '', 'durationtime': 0, 'starttime': time.time(), 'endtime':0, 'tag': '', 'log': '', 'root_span_flag':True, 'child_span': '' } return self.dic def record_save(self, span): currenttracer = {'id': span['spanid'], 'data': span} print(currenttracer) l.append(currenttracer) def record(self): self.span['servername'] = self.servername self.span['location'] = os.getcwd() + '.' + self.servername self.span['endtime'] = time.time() self.span['durationtime'] = self.span['endtime'] - self.span['starttime'] def setspantag(self,tag): self.span['tag'] = tag def setspanlog(self,log): self.span['log'] = log# 連續(xù)調(diào)用with Recorder(’server1’) as span: time.sleep(1) span.setspantag('test') #調(diào)用server1方法 print('server1') with Recorder(’server2’,span) as span1: time.sleep(2) # 調(diào)用server2方法 print('server2') with Recorder(’server3’,span1) as span2: time.sleep(0.5) # 調(diào)用server3方法 print('server3')#單獨調(diào)用記錄with Recorder(’server4’) as span_test1: time.sleep(1.5) print('server4')with Recorder(’server5’) as span_test2: time.sleep(2) print('server5')

運行結(jié)果：

server1server2server3{’id’: 224716339449765695394515303164364012192, ’data’: {’spanid’: 224716339449765695394515303164364012192, ’servername’: ’server3’, ’location’: ’D:python_protestprotesttracetrace_main.server3’, ’ip’: ’’, ’durationtime’: 0.5004403591156006, ’starttime’: 1598947338.0551107, ’endtime’: 1598947338.555551, ’tag’: ’’, ’log’: ’’, ’root_span_flag’: False, ’child_span’: None}}{’id’: 254736847532758359233387151739984206570, ’data’: {’spanid’: 254736847532758359233387151739984206570, ’servername’: ’server2’, ’location’: ’D:python_protestprotesttracetrace_main.server2’, ’ip’: ’’, ’durationtime’: 2.501264810562134, ’starttime’: 1598947336.0542862, ’endtime’: 1598947338.555551, ’tag’: ’’, ’log’: ’’, ’root_span_flag’: False, ’child_span’: {’spanid’: 224716339449765695394515303164364012192, ’servername’: ’server3’, ’location’: ’D:python_protestprotesttracetrace_main.server3’, ’ip’: ’’, ’durationtime’: 0.5004403591156006, ’starttime’: 1598947338.0551107, ’endtime’: 1598947338.555551, ’tag’: ’’, ’log’: ’’, ’root_span_flag’: False, ’child_span’: None}}}{’id’: 91028031631192607088457781914309166266, ’data’: {’spanid’: 91028031631192607088457781914309166266, ’servername’: ’server1’, ’location’: ’D:python_protestprotesttracetrace_main.server1’, ’ip’: ’’, ’durationtime’: 3.5021069049835205, ’starttime’: 1598947335.0534441, ’endtime’: 1598947338.555551, ’tag’: ’test’, ’log’: ’’, ’root_span_flag’: True, ’child_span’: {’spanid’: 254736847532758359233387151739984206570, ’servername’: ’server2’, ’location’: ’D:python_protestprotesttracetrace_main.server2’, ’ip’: ’’, ’durationtime’: 2.501264810562134, ’starttime’: 1598947336.0542862, ’endtime’: 1598947338.555551, ’tag’: ’’, ’log’: ’’, ’root_span_flag’: False, ’child_span’: {’spanid’: 224716339449765695394515303164364012192, ’servername’: ’server3’, ’location’: ’D:python_protestprotesttracetrace_main.server3’, ’ip’: ’’, ’durationtime’: 0.5004403591156006, ’starttime’: 1598947338.0551107, ’endtime’: 1598947338.555551, ’tag’: ’’, ’log’: ’’, ’root_span_flag’: False, ’child_span’: None}}}}server4{’id’: 103171729522922437998918618387133480096, ’data’: {’spanid’: 103171729522922437998918618387133480096, ’servername’: ’server4’, ’location’: ’D:python_protestprotesttracetrace_main.server4’, ’ip’: ’’, ’durationtime’: 1.5001769065856934, ’starttime’: 1598947338.555551, ’endtime’: 1598947340.055728, ’tag’: ’’, ’log’: ’’, ’root_span_flag’: True, ’child_span’: None}}server5{’id’: 320091321623887285825256878422834254741, ’data’: {’spanid’: 320091321623887285825256878422834254741, ’servername’: ’server5’, ’location’: ’D:python_protestprotesttracetrace_main.server5’, ’ip’: ’’, ’durationtime’: 2.0005736351013184, ’starttime’: 1598947340.055728, ’endtime’: 1598947342.0563016, ’tag’: ’’, ’log’: ’’, ’root_span_flag’: True, ’child_span’: None}}

關(guān)于下一步，會使用redis存儲其結(jié)果，并進行相應(yīng)的輸出分析。

修過不能追蹤同級調(diào)用的問題

import uuidimport osimport timel = []class Recorder(object): def __init__(self,servername,root_span = None): if root_span == None: self.__span = Span(servername) else: self.__span = Span(servername,root_span) #上下文管理器 def __enter__(self): return self.__span # 退出方法中，用來實現(xiàn)善后處理工作 def __exit__(self, exc_type, exc_val, exc_tb): self.__span.record() self.__span.record_save(self.__span.span)class Span(object): def __init__(self,servername,root_span = None): self.servername = servername self.span = self.newspan() if root_span != None: root_span.dic[’child_span’].append(self.span) self.span['root_span_flag'] = False def newspan(self): self.dic = { 'spanid': uuid.uuid4().int, 'servername': self.servername, 'location': '', 'ip': '', 'durationtime': 0, 'starttime': time.time(), 'endtime':0, 'tag': '', 'log': '', 'root_span_flag':True, 'child_span': [] } return self.dic def record_save(self, span): currenttracer = {'id': span['spanid'], 'data': span} print(currenttracer) l.append(currenttracer) def record(self): self.span['servername'] = self.servername self.span['location'] = os.getcwd() + '.' + self.servername self.span['endtime'] = time.time() self.span['durationtime'] = self.span['endtime'] - self.span['starttime'] def setspantag(self,tag): self.span['tag'] = tag def setspanlog(self,log): self.span['log'] = log# 連續(xù)調(diào)用with Recorder(’server1’) as span: time.sleep(1) span.setspantag('test') #調(diào)用server1方法 print('server1') with Recorder(’server2’,span) as span1: time.sleep(2) # 調(diào)用server2方法 print('server2') with Recorder(’server3’,span1) as span2: time.sleep(0.5) # 調(diào)用server3方法 print('server3')# 并級連續(xù)調(diào)用# with Recorder(’server1’) as span1:# time.sleep(1)# span1.setspantag('test')# #調(diào)用server1方法# print('server1')# with Recorder(’server2’,span1) as span2:# time.sleep(2)# # 調(diào)用server2方法# print('server2')# with Recorder(’server3’,span1) as span3:# time.sleep(0.5)# # 調(diào)用server3方法# print('server3')# #單獨調(diào)用記錄# with Recorder(’server4’) as span_test1:# time.sleep(1.5)# print('server4')## with Recorder(’server5’) as span_test2:# time.sleep(2)# print('server5')

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