My code is exactly this, and the export API is working fine.
IT seems like no data is sent to the UploadForm struct.
I've got HTTP real data with wireshark and this i exactly what we are sending to the macaron handler.
POST /api/cfg/import HTTP/1.1
Host: localhost:8090
Connection: keep-alive
Content-Length: 7275
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36
Origin: chrome-extension://apcedakaoficjlofohhcmkkljehnmebp
Content-Type: multipart/form-data
Accept: */*
Accept-Encoding: gzip, deflate, br
Accept-Language: es,ca;q=0.8,en;q=0.6,en-US;q=0.4
Cookie: MacaronSession=127714bd60ec66e0; snmpcollector-sess-lan=9da867813c641552
------WebKitFormBoundaryfin1vPdBlN5ZQrnv
Content-Disposition: form-data; name="fileUpload1"; filename="blob"
Content-Type: text/plain
{"Info":{"FileName":"","Description":"","Author":"","Tags":""},"AgentVersion":"","ExportVersion":"1.0","CreationDate":"2017-02-18T06:37:28.159948966+01:00","Objects":[{"ObjectTypeID":"influxcfg","ObjectID":"default","ObjectPtr":{"ID":"default","Host":"127.0.0.1","Port":8086,"DB":"snmp","User":"snmpuser","Password":"snmppass","Retention":"autogen","Timeout":5,"UserAgent":"snmpcollector_agent_00","Description":""}},{"ObjectTypeID":"oidconditioncfg","ObjectID":"test_multiple","ObjectPtr":{"ID":"test_multiple","IsMultiple":true,"OIDCond":"filter_port_if_status_up \u0026\u0026 filter_port_if_name_match_eth0","CondType":"","CondValue":"","Description":"adf"}},{"ObjectTypeID":"measfiltercfg","ObjectID":"filter_multiple_test","ObjectPtr":{"ID":"filter_multiple_test","IDMeasurementCfg":"linux_ports","FType":"OIDCondition","FilterName":"test_multiple","EnableAlias":false,"Description":"test"}},{"ObjectTypeID":"snmpmetriccfg","ObjectID":"ifOutErrors","ObjectPtr":{"ID":"ifOutErrors","FieldName":"ifOutErrors","Description":"","BaseOID":".1.3.6.1.2.1.2.2.1.20","DataSrcType":"COUNTER32","GetRate":false,"Scale":0,"Shift":0,"IsTag":false,"ExtraData":""}},{"ObjectTypeID":"snmpmetriccfg","ObjectID":"ifInErrors","ObjectPtr":{"ID":"ifInErrors","FieldName":"ifInErrors","Description":"","BaseOID":".1.3.6.1.2.1.2.2.1.14","DataSrcType":"COUNTER32","GetRate":false,"Scale":0,"Shift":0,"IsTag":false,"ExtraData":""}},{"ObjectTypeID":"snmpmetriccfg","ObjectID":"evaluated_prefix_for_ifname","ObjectPtr":{"ID":"evaluated_prefix_for_ifname","FieldName":"prefixed_ifname","Description":"Add Prefix for ifname","BaseOID":"","DataSrcType":"STRINGEVAL","GetRate":false,"Scale":0,"Shift":0,"IsTag":true,"ExtraData":"'myprefix_'+IfName"}},{"ObjectTypeID":"snmpmetriccfg","ObjectID":"ifName","ObjectPtr":{"ID":"ifName","FieldName":"IfName","Description":"Tags","BaseOID":".1.3.6.1.2.1.31.1.1.1.1","DataSrcType":"OCTETSTRING","GetRate":false,"Scale":0,"Shift":0,"IsTag":true,"ExtraData":""}},{"ObjectTypeID":"snmpmetriccfg","ObjectID":"IfH_out_percent_utilization","ObjectPtr":{"ID":"IfH_out_percent_utilization","FieldName":"out_percent_utilization","Description":"% utlization out","BaseOID":"","DataSrcType":"STRINGEVAL","GetRate":false,"Scale":0,"Shift":0,"IsTag":false,"ExtraData":"(out_octets * 8) / ( ifhspeed * 10000)"}},{"ObjectTypeID":"snmpmetriccfg","ObjectID":"ifH_in_percent_utilization","ObjectPtr":{"ID":"ifH_in_percent_utilization","FieldName":"in_percent_utilization","Description":"% utlization in","BaseOID":"","DataSrcType":"STRINGEVAL","GetRate":false,"Scale":0,"Shift":0,"IsTag":false,"ExtraData":"(in_octets * 8 ) / (ifhspeed * 10000)"}},{"ObjectTypeID":"snmpmetriccfg","ObjectID":"ifHighSpeed","ObjectPtr":{"ID":"ifHighSpeed","FieldName":"ifhspeed","Description":"Bytes Out - 64-bit Counters","BaseOID":".1.3.6.1.2.1.31.1.1.1.15","DataSrcType":"Gauge32","GetRate":false,"Scale":0,"Shift":0,"IsTag":false,"ExtraData":"user + system + idle"}},{"ObjectTypeID":"snmpmetriccfg","ObjectID":"ifHCOutOctets","ObjectPtr":{"ID":"ifHCOutOctets","FieldName":"out_octets","Description":"Bytes Out - 64-bit Counters","BaseOID":".1.3.6.1.2.1.31.1.1.1.10","DataSrcType":"COUNTER64","GetRate":true,"Scale":0,"Shift":0,"IsTag":false,"ExtraData":"user + system + idle"}},{"ObjectTypeID":"snmpmetriccfg","ObjectID":"ifHCInOctets","ObjectPtr":{"ID":"ifHCInOctets","FieldName":"in_octets","Description":"Bytes In - 64-bit Counters","BaseOID":".1.3.6.1.2.1.31.1.1.1.6","DataSrcType":"COUNTER64","GetRate":true,"Scale":0,"Shift":0,"IsTag":false,"ExtraData":"user + system + idle"}},{"ObjectTypeID":"measurementcfg","ObjectID":"linux_ports","ObjectPtr":{"ID":"linux_ports","Name":"linux_ports","GetMode":"indexed","IndexOID":".1.3.6.1.2.1.31.1.1.1.1","TagOID":"","IndexTag":"portName","IndexTagFormat":"","IndexAsValue":false,"Fields":[{"ID":"ifHCInOctets","Report":1},{"ID":"ifHCOutOctets","Report":1},{"ID":"ifHighSpeed","Report":1},{"ID":"ifH_in_percent_utilization","Report":1},{"ID":"IfH_out_percent_utilization","Report":1},{"ID":"ifName","Report":1},{"ID":"evaluated_prefix_for_ifname","Report":1},{"ID":"ifInErrors","Report":2},{"ID":"ifOutErrors","Report":2}],"Description":""}},{"ObjectTypeID":"oidconditioncfg","ObjectID":"filter_port_if_status_up","ObjectPtr":{"ID":"filter_port_if_status_up","IsMultiple":false,"OIDCond":".1.3.6.1.2.1.2.2.1.8","CondType":"neq","CondValue":"1","Description":""}},{"ObjectTypeID":"snmpmetriccfg","ObjectID":"test_cond_oid","ObjectPtr":{"ID":"test_cond_oid","FieldName":"oidtest","Description":"afaf","BaseOID":"","DataSrcType":"CONDITIONEVAL","GetRate":false,"Scale":0,"Shift":0,"IsTag":false,"ExtraData":"filter_port_if_status_up"}},{"ObjectTypeID":"snmpmetriccfg","ObjectID":"Linux_user_CPU_total","ObjectPtr":{"ID":"Linux_user_CPU_total","FieldName":"cpu_total","Description":"calculo de CPU total","BaseOID":"","DataSrcType":"STRINGEVAL","GetRate":false,"Scale":0,"Shift":0,"IsTag":false,"ExtraData":"user + system + idle"}},{"ObjectTypeID":"snmpmetriccfg","ObjectID":"Linux_idle_CPU_percent","ObjectPtr":{"ID":"Linux_idle_CPU_percent","FieldName":"idle","Description":"percentage of Idle CPU time","BaseOID":".1.3.6.1.4.1.2021.11.11.0","DataSrcType":"INTEGER","GetRate":false,"Scale":0,"Shift":0,"IsTag":false,"ExtraData":""}},{"ObjectTypeID":"snmpmetriccfg","ObjectID":"Linux_system_CPU_percent","ObjectPtr":{"ID":"Linux_system_CPU_percent","FieldName":"system","Description":"percentage of system CPU time","BaseOID":".1.3.6.1.4.1.2021.11.10.0","DataSrcType":"INTEGER","GetRate":false,"Scale":0,"Shift":0,"IsTag":false,"ExtraData":""}},{"ObjectTypeID":"snmpmetriccfg","ObjectID":"Linux_user_CPU_percent","ObjectPtr":{"ID":"Linux_user_CPU_percent","FieldName":"user","Description":"percentage of user CPU time","BaseOID":".1.3.6.1.4.1.2021.11.9.0","DataSrcType":"INTEGER","GetRate":false,"Scale":0,"Shift":0,"IsTag":false,"ExtraData":""}},{"ObjectTypeID":"measurementcfg","ObjectID":"linux_cpu","ObjectPtr":{"ID":"linux_cpu","Name":"linux.cpu","GetMode":"value","IndexOID":"","TagOID":"","IndexTag":"","IndexTagFormat":"","IndexAsValue":false,"Fields":[{"ID":"Linux_user_CPU_percent","Report":1},{"ID":"Linux_system_CPU_percent","Report":1},{"ID":"Linux_idle_CPU_percent","Report":1},{"ID":"Linux_user_CPU_total","Report":1},{"ID":"test_cond_oid","Report":1}],"Description":""}},{"ObjectTypeID":"measgroupscfg","ObjectID":"Linux","ObjectPtr":{"ID":"Linux","Measurements":["linux_cpu","linux_ports"],"Description":""}},{"ObjectTypeID":"snmpdevicecfg","ObjectID":"hostsnmpv3a","ObjectPtr":{"ID":"hostsnmpv3a","Host":"hostsnmpv3a","Port":161,"Retries":5,"Timeout":20,"Repeat":0,"Active":true,"SnmpVersion":"3","Community":"public","V3SecLevel":"NoAuthNoPriv","V3AuthUser":"v3usernoauth","V3AuthPass":"v3passauth","V3AuthProt":"MD5","V3PrivPass":"","V3PrivProt":"","DisableBulk":false,"Freq":30,"UpdateFltFreq":1,"OutDB":"default","LogLevel":"debug","LogFile":"","SnmpDebug":false,"DeviceTagName":"router","DeviceTagValue":"id","ExtraTags":["tagA=4","tagB=5","tagC=6"],"Description":"","MeasurementGroups":["Linux"],"MeasFilters":["filter_multiple_test"]}}]}
There is no any warning error , and I've done exact as you did in the above example. I will be happy if you can help me.