function Client:ping()

in lib/skywalking/client.lua [126:157]

• 28 lines of code
• 4 McCabe index (conditional complexity)

function Client:ping(metadata_buffer, backend_http_uri)
    local log = ngx.log
    local ERR = ngx.ERR

    local serviceName = metadata_buffer:get('serviceName')
    local serviceInstanceName = metadata_buffer:get('serviceInstanceName')

    local cjson = require('cjson')
    local pingPkg = require("skywalking.management").newServiceInstancePingPkg(serviceName, serviceInstanceName)
    local pingPkgParam, err = cjson.encode(pingPkg)
    if err then
        log(ERR, "Agent ping fails, ", err)
    end

    local http = require('resty.http')
    local httpc = http.new()
    local res, err = httpc:request_uri(backend_http_uri .. '/v3/management/keepAlive', {
        method = "POST",
        body = pingPkgParam,
        headers = {
            ["Content-Type"] = "application/json",
        },
    })

    if err == nil then
        if res.status ~= 200 then
            log(ERR, "Agent ping fails, response code ", res.status)
        end
    else
        log(ERR, "Agent ping fails, ", err)
    end
end