Class: Raas::Client::Rails::RestClient

Inherits:
Object
  • Object
show all
Defined in:
app/controllers/raas/client/rails/rest_client.rb

Overview

Rest Client for RaaS

Constant Summary collapse

GET = 
"get"
POST = 
"post"
PUT = 
"put"
DELETE = 
"delete"
APEX_DOMAIN = 
"functions.asaservice.inc"

Instance Method Summary collapse

Constructor Details

#initialize(tenant, sub, tenant_alias, sub_alias, sub_domain, scope = nil) ⇒ RestClient

Returns a new instance of RestClient.



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# File 'app/controllers/raas/client/rails/rest_client.rb', line 15

def initialize(tenant, sub, tenant_alias, sub_alias, sub_domain, scope = nil)
    @application = Raas::Client::Rails::Engine.config.raas_client_rails.application
    @landscape = Raas::Client::Rails::Engine.config.raas_client_rails.landscape
    @token = Raas::Client::Rails::Engine.config.raas_client_rails.token
    @tenant = tenant
    @sub = sub
    @tenant_alias = tenant_alias
    @sub_alias = sub_alias
    @sub_domain = sub_domain
    @scope = scope
end

Instance Method Details

#createBody ⇒ Object 



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# File 'app/controllers/raas/client/rails/rest_client.rb', line 36

def createBody()
    body = Hash.new
    body["tenant"] = @tenant
    body["sub"] = @sub
    if @tenant_alias
        body["tenantAlias"] = @tenant_alias 
    end
    if @sub_alias
        body["subAlias"] = @sub_alias 
    end
    return body
end

#createExternalSession(msa, backUrl, subUrl, subDomain) ⇒ Object 



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# File 'app/controllers/raas/client/rails/rest_client.rb', line 27

def createExternalSession(msa,backUrl,subUrl,subDomain)
    body = createBody()
    body["backUrl"] = backUrl
    body["subUrl"] = subUrl
    body["subDomain"] = subDomain || @sub_domain || ""
    body["scope"] = @scope if @scope
    return proxy(body,POST,"/#{msa}/external/session",nil,@token)
end

#decideDomain ⇒ Object 



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# File 'app/controllers/raas/client/rails/rest_client.rb', line 156

def decideDomain()
    if "prod" == @landscape then
        return "#{@application}.#{APEX_DOMAIN}"
    else
        return "#{@application}.#{@landscape}.#{APEX_DOMAIN}"
    end
end

#delete(requestUrl, params) ⇒ Object 



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# File 'app/controllers/raas/client/rails/rest_client.rb', line 77

def delete(requestUrl, params)
    json = getUserToken()
    return proxy(nil, DELETE,requestUrl,params,json["token"]);
end

#get(requestUrl, params) ⇒ Object 



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# File 'app/controllers/raas/client/rails/rest_client.rb', line 72

def get(requestUrl, params)
    json = getUserToken()
    return proxy(nil, GET,requestUrl,params,json["token"]);
end

#getUserToken ⇒ Object 



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# File 'app/controllers/raas/client/rails/rest_client.rb', line 49

def getUserToken()
    #No  trace level... so that adding [TRACE] for filtering
    Rails.logger.debug("[TRACE] getUserToken is started");        
    #Use Rails default cache system, this simply use cache otherwise fetch and store
    Rails.logger.debug("Attempt to recycle token");
    cacheName = "#{@tenant}+++#{@sub}"
    Rails.logger.debug("Cache name is #{cacheName}")
    # p cacheName
    return token = Rails.cache.fetch(cacheName) do
        Rails.logger.debug("No cache found, fetch it by api");
        Rails.logger.debug("tenant #=> #{@tenant} / sub #=> #{@sub}")
        response = getUserTokenImpl("report");
        Rails.logger.debug(response.body)
        return JSON.parse(response.body);
    end
end

#getUserTokenImpl(msa) ⇒ Object

fetch token from RaaS because no cache



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# File 'app/controllers/raas/client/rails/rest_client.rb', line 67

def getUserTokenImpl(msa)
    body = createBody()
    response = proxy(body,POST,"/#{msa}/external/token",nil,@token);
end

#post(requestUrl, body) ⇒ Object 



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# File 'app/controllers/raas/client/rails/rest_client.rb', line 87

def post(requestUrl,body)
    json = getUserToken()
    return proxy(body , POST,requestUrl,nil,json["token"]);
end

#proxy(body, method, requestUrl, params, token) ⇒ Object 



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# File 'app/controllers/raas/client/rails/rest_client.rb', line 92

def proxy(body,method,requestUrl,params,token)
    Rails.logger.warn("method:#{method} url:#{requestUrl} token:#{token} params:#{params}" );
    #TraceID seems to be different... is it OK!?
    traceId = SecureRandom.uuid;
    Rails.logger.debug("[TRACE] traceId=#{traceId}")
    # p "token: #{token}"
    domain = decideDomain();
    uri = "https://#{domain}#{requestUrl}"
    url = URI.parse(uri)
    unless params.nil?
        #should I do like this!?
        parameters_hash = params.to_unsafe_h
        url.query = URI.encode_www_form(parameters_hash) unless params.nil?
    end
    # replacing context path form urI to match actual gateway URI
    headers = {
        'TRACE'  => traceId,
        'Content-Type' => 'application/json',
        'Accept' => 'application/json',
        'Authorization' => "Bearer #{token}"
    }
    #restTemplate.exchange alternative
    case method
    when GET
        httpEntity = Net::HTTP::Get.new(url.to_s,headers)
    when POST
        httpEntity = Net::HTTP::Post.new(url.to_s,headers)
    when DELETE
        httpEntity = Net::HTTP::Delete.new(url.to_s,headers)
    when PUT
        httpEntity = Net::HTTP::Put.new(url.to_s,headers)
    else
        puts "method is not be defined..."
    end
    
    httpEntity.body = body.to_json if body
    retry_count = 0
    max_retries = 4
    host = URI(url.to_s).host
    port = URI(url.to_s).port
    begin
        Rails.logger.debug(url.to_s);
        Rails.logger.debug(body);
        Rails.logger.debug(httpEntity);
        http = Net::HTTP.new(host,port)
        http.use_ssl = true
        # p url.to_s
        response = http.request(httpEntity)
        Rails.logger.debug(response);
        return response;
    rescue => e
        retry_count += 1
        if retry_count <= max_retries
            Rails.logger.debug("Retry attempt #{retry_count}")
            sleep(4) #wait 4 seconds
            retry
        else
            Rails.logger.error("retry method for the following url #{uri} has failed #{e}");
            Rails.logger.error(e.backtrace);
            raise e
        end
    end
end

#put(requestUrl, body) ⇒ Object 



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# File 'app/controllers/raas/client/rails/rest_client.rb', line 82

def put(requestUrl,body)
    json = getUserToken()
    return proxy(body , PUT,requestUrl,nil,json["token"]);
end