services_generic.go

Documentation: scheduler/faas_openfaas

     1  /*
     2   * P2PFaaS - A framework for FaaS Load Balancing
     3   * Copyright (c) 2019 - 2022. Gabriele Proietti Mattia <pm.gabriele@outlook.com>
     4   *
     5   * This program is free software: you can redistribute it and/or modify
     6   * it under the terms of the GNU General Public License as published by
     7   * the Free Software Foundation, either version 3 of the License, or
     8   * (at your option) any later version.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <https://www.gnu.org/licenses/>.
    17   */
    18  
    19  package faas_openfaas
    20  
    21  import (
    22  	"encoding/json"
    23  	"scheduler/log"
    24  	"scheduler/types"
    25  )
    26  
    27  func GenFunctionsGet(host string) ([]Function, *types.FaasApiResponse, error) {
    28  	res, err := functionsGetApiCall(host)
    29  	if err != nil {
    30  		log.Log.Debugf("Cannot get services from openfaas: %s", err.Error())
    31  		return nil, res, err
    32  	}
    33  
    34  	var functions []Function
    35  	err = json.Unmarshal([]byte(res.Body), &functions)
    36  	if err != nil {
    37  		log.Log.Debugf("Cannot decode services from openfaas: %s: %s", res.Body, err.Error())
    38  		return nil, res, err
    39  	}
    40  	return functions, res, nil
    41  }
    42  
    43  func GenFunctionGet(host string, functionName string) (*Function, *types.FaasApiResponse, error) {
    44  	res, err := functionGetApiCall(host, functionName)
    45  	if err != nil {
    46  		log.Log.Debugf("Cannot get service from openfaas: %s", err.Error())
    47  		return nil, res, err
    48  	}
    49  
    50  	var function Function
    51  	err = json.Unmarshal([]byte(res.Body), &function)
    52  
    53  	if err != nil {
    54  		log.Log.Debugf("Reply is (%d) [%s]: %s", res.StatusCode, res.StatusCode, res.Body)
    55  		log.Log.Debugf("Cannot decode service from openfaas: %s", err.Error())
    56  		return nil, res, err
    57  	}
    58  	return &function, res, nil
    59  }
    60  
    61  func GenFunctionDeploy(host string, function Function) (*types.FaasApiResponse, error) {
    62  	res, err := functionDeployApiCall(host, function)
    63  	if err != nil {
    64  		log.Log.Debugf("Cannot deploy service" + function.Name + ": " + err.Error())
    65  	}
    66  	return res, err
    67  }
    68  
    69  func GenFunctionExecute(host string, functionName string, payload []byte, contentType string) (*types.FaasApiResponse, error) {
    70  	var res *types.FaasApiResponse
    71  	var err error
    72  
    73  	if payload == nil {
    74  		res, err = functionExecuteApiCall(host, functionName)
    75  	} else {
    76  		res, err = functionExecutePostApiCall(host, functionName, payload, contentType)
    77  	}
    78  
    79  	if err != nil {
    80  		return nil, err
    81  	}
    82  	if res.StatusCode == 404 {
    83  		return res, ErrorFunctionNotFound{}
    84  	}
    85  	if res.StatusCode >= 500 {
    86  		return res, ErrorInternal{string(res.Body)}
    87  	}
    88  	if res.StatusCode < 200 || res.StatusCode >= 300 {
    89  		return res, ErrorGeneric{string(res.Body)}
    90  	}
    91  	return res, nil
    92  }
    93  
    94  func GenFunctionScale(host string, functionName string, replicas uint) (*types.FaasApiResponse, error) {
    95  	res, err := functionScaleApiCall(host, functionName, replicas)
    96  	if err != nil {
    97  		return nil, err
    98  	}
    99  	if res.StatusCode == 404 {
   100  		return res, ErrorFunctionNotFound{}
   101  	}
   102  	if res.StatusCode >= 500 {
   103  		return res, ErrorInternal{string(res.Body)}
   104  	}
   105  	if res.StatusCode < 200 || res.StatusCode >= 300 {
   106  		return res, ErrorGeneric{string(res.Body)}
   107  	}
   108  	return res, nil
   109  }
   110  
   111  func GenFunctionScaleByOne(host string, functionName string) (*types.FaasApiResponse, error) {
   112  	reps, err := GenFunctionGetReplicas(host, functionName)
   113  	if err != nil {
   114  		log.Log.Debugf("Could not scale by one service %s: %s", functionName, err.Error())
   115  		return nil, err
   116  	}
   117  	return functionScaleApiCall(host, functionName, reps+1)
   118  }
   119  
   120  func GenFunctionScaleDownByOne(host string, functionName string) (*types.FaasApiResponse, error) {
   121  	reps, err := GenFunctionGetReplicas(host, functionName)
   122  	if err != nil {
   123  		log.Log.Debugf("Could not scale down by one service %s: %s", functionName, err.Error())
   124  		return nil, err
   125  	}
   126  	return functionScaleApiCall(host, functionName, reps-1)
   127  }
   128
View as plain text