Building an IoT platform with Go and Python

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Building an IoT platform with Go and Python David Majda @dmajda Golang Prague #3 · Prague · 13 September, 2018

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Outline What do we do? Data pipeline Python vs. Go What did we learn?

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What do we do?

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Data pipeline

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Typical Go service Service Data Data Config

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Python vs. Go

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Comparison Language Ecosystem Performance Concurrency Deployment

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Language

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Simple

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Simple Easy to learn

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Simple Easy to learn Fast development

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Simple Easy to learn Fast development Reliable

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Simple Easy to learn Fast development Reliable No complaints

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Simple Easy to learn Fast development Reliable No complaints Simple

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Simple Easy to learn Fast development Reliable No complaints Simple Easy to learn

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Simple Easy to learn Fast development Reliable No complaints Simple Easy to learn Fast development

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Simple Easy to learn Fast development Reliable No complaints Simple Easy to learn Fast development Reliable

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Simple Easy to learn Fast development Reliable No complaints Simple Easy to learn Fast development Reliable Tons of complaints

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Complaints

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Complaints Too simple

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Complaints Too simple Unnecessarily different

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Complaints Too simple Unnecessarily different Inflexible

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Complaints Too simple Unnecessarily different Inflexible Likes to be left alone

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Complaints Too simple Unnecessarily different Inflexible Likes to be left alone Many other small issues

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{ "type": "gateway", "sn": "3FCF54AADCB6E7DC" } { "type": "sensor", "gateway_sn": "3FCF54AADCB6E7DC", "channel": 5 }

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type Device struct { Type string `json:"type"` SN *string `json:"sn,omitempty"` // pointer! GatewaySN *string `json:"gateway_sn,omitempty"` // pointer! Channel *uint `json:"channel,omitempty"` // pointer! } input := `{"type": "Gateway", "sn": "3FCF54AADCB6E7DC"}` device := Device{} json.Unmarshal([]byte(input), &device) fmt.Println(device) // {Gateway 0x1050c160 } output, _ := json.Marshal(device) fmt.Printf("%s\n", output) // {"type":"Gateway","sn":"3FCF54AADCB6E7DC"}

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@JsonTypeInfo( use = JsonTypeInfo.Id.NAME, include = As.PROPERTY, property = "type" ) @JsonSubTypes({ @JsonSubTypes.Type(value = Gateway.class, name = "gateway"), @JsonSubTypes.Type(value = Sensor.class, name = "sensor") }) public class Device { } @JsonTypeName("gateway") public class Gateway extends Device { public String sn; } @JsonTypeName("sensor") public class Sensor extends Device { public String gatewaySN; public int channel; }

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{ "type": "gateway", "gateway": { "sn": "3FCF54AADCB6E7DC" } } { "type": "sensor", "sensor": { "gateway_sn": "3FCF54AADCB6E7DC", "channel": 5 } }

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Ecosystem

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Excellent Except asyncio (later)

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Excellent Except asyncio (later) Excellent

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Performance

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Good :-)

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Good :-) Better :-)

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Concurrency

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Threads 90’s technology

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Threads 90’s technology asyncio Parallel world Poor usability Bad libraries

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Threads 90’s technology asyncio Parallel world Poor usability Bad libraries Goroutines & channels Model the real world really nicely

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Deployment

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Python 2/3

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Python 2/3 Virtualenvs

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Python 2/3 Virtualenvs Packaging

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Python 2/3 Virtualenvs Packaging Tons of files

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Python 2/3 Virtualenvs Packaging Tons of files Single binary

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All invalidated by…

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What did we learn?

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Simple services One well-defined task Performance needed Concurrency useful

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Apps Simple services One well-defined task Performance needed Concurrency useful

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Apps Complex services Simple services One well-defined task Performance needed Concurrency useful

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Apps Complex services Scripts Simple services One well-defined task Performance needed Concurrency useful

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Apps Complex services Scripts Prototyping Simple services One well-defined task Performance needed Concurrency useful