## What does this API do ? This api as of now provides a function which takes in a list of 'QUERY_STRINGs' with respect to prometheus and returns the corresponding result_sets in a list. For eg: If the QUERY_STRING is ``` QUERY_STRING = ['irate(collectd_cpufreq{exported_instance="otconap7",cpufreq="1"}[2m])'] ``` The return is: ``` [{'metric': {'cpufreq': '1', 'endpoint': 'collectd-prometheus', 'exported_instance': 'otconap7', 'instance': '172.25.103.1:9103', 'job': 'collectd', 'namespace': 'edge1', 'pod': 'plundering-liger-collectd-wz7xg', 'service': 'collectd'}, 'value': [1559177169.415, '119727200']}] ``` i ## How to use this API ? ``` 1. Copy the directory 'promql_api' to your working directory. ``` ``` 2. Import the API function: query from promql_api.prom_ql_api import query ``` ``` 3. have a global or local variable as 'QUERY_STRING' QUERY_STRING = ['irate(collectd_cpufreq{exported_instance="otconap7",cpufreq="1"}[2m])'] ``` ``` 4. Store the result set in a list: list_of_result_sets = query(QUERY_STRING) ``` ## Troubleshooting tips * Check the sample file - sample_promql_query.py in the repo ( sample-apps/m3db_promql) * Make sure the file "__init__.py" is present in promql_api directory after you copy the directory. * Make sure environment variables like "DATA_ENDPOINT" are correctly set. * For custom and advanced querying https://prometheus.io/docs/prometheus/latest/querying/api/ * Logs are generated in the directory where the query function is called. * sample log file - promql_api.log ``` 05-30-2019 08:47:53PM ::prom_ql_api.py :: set_log_config :: INFO :: Set the log configs. 05-30-2019 08:47:53PM ::prom_ql_api.py :: load_and_validate_env_vars :: INFO :: Loading the env variables ... 05-30-2019 08:47:53PM ::prom_ql_api.py :: load_and_validate_env_vars :: ERROR :: Env var: DATA_ENDPOINT not found ! 05-30-2019 08:47:53PM ::prom_ql_api.py :: query :: INFO :: Forming the get request ... 05-30-2019 08:47:53PM ::prom_ql_api.py :: query :: INFO :: API request::: URL: http://172.25.103.1:30090/api/v1/ query 05-30-2019 08:47:53PM ::prom_ql_api.py :: query :: INFO :: API request::: params: {'query': 'irate(collectd_cpufreq{exported_instance="otconap7",cpufreq="1"}[2m])'} 05-30-2019 08:47:53PM ::connectionpool.py :: _new_conn :: DEBUG :: Starting new HTTP connection (1): 172.25.103.1 05-30-2019 08:47:53PM ::connectionpool.py :: _make_request :: DEBUG :: http://172.25.103.1:30090 "GET /api/v1/ query?query=irate%28collectd_cpufreq%7Bexported_instance%3D%22otconap7%22%2Ccpufreq%3D%221%22%7D%5B2m%5D%29 HTTP/1. 1" 200 370 05-30-2019 08:47:53PM ::prom_ql_api.py :: query :: INFO :: ::::::::::RESULTS::::::::::::: irate(collectd_cpufreq{exported_instance="otconap7",cpufreq="1"}[2m]) 05-30-2019 08:47:53PM ::prom_ql_api.py :: query :: INFO :: {'metric': {'cpufreq': '1', 'endpoint': 'collectd- prometheus', 'exported_instance': 'otconap7', 'instance': '172.25.103.1:9103', 'job': 'collectd', 'namespace': 'edge1', 'pod': 'plundering-liger-collectd-wz7xg', 'service': 'collectd'}, 'value': [1559249299.084, '236300']} ``` * Tested Error scenario: Configure QUERY_STRING as : ``` QUERY_STRING = ['irate(collectd_cpufreq{exported_instance="otconap7", cpufreq="1"}[2m])', 'collectd_cpu_percent{job="collectd" exported_instance="an11-31"}[1m]'] ``` O/P : ``` Check logs..HTTP error occurred: 400 Client Error: Bad Request for url: http://172.25.103.1:30090/api/v1/query?query=collectd_cpu_percent%7Bjob%3D%22collectd%22+exported_instance%3D%22an11-31%22%7D%5B1m%5D [{'metric': {'cpufreq': '1', 'endpoint': 'collectd-prometheus', 'exported_instance': 'otconap7', 'instance': '172.25.103.1:9103', 'job': 'collectd', 'namespace': 'edge1', 'pod': 'plundering-liger-collectd-wz7xg', 'service': 'collectd'}, 'value': [1559343866.631, '119798600']}] {'error': 'parse error at char 37: missing comma before next identifier ' '"exported_instance"', 'errorType': 'bad_data'} ```