polydat 0.3.2

Polydat — a variates construction engine
Documentation 
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// Polytile demo: a JSON document and the statement that carries it,
// both rendered per cycle by the polydat binary.

input cycle: u64

const keyspace := "toy"
const table := "readings"

(tenant, device, reading) := mixed_radix(cycle, 20, 50, 0)
tenant_id := hashed_id(input: tenant, bound: 1000000)
device_id := hashed_uuid(interleave(tenant, device))
temp_c    := normal_sample(input: hash(cycle), mean: 21.5, stddev: 2.0)
status    := weighted_strings(hash(hash(cycle)), "ok:0.97;degraded:0.02;error:0.01")
alert     := u64_gt(mod(cycle, 5), 3)

tile doc : json := {
    "meta": { "schema": 3, "source": "polydat", "units": { "temp": "C" } },
    "tenant": ${tenant_id},
    "device": ${device_id},
    "reading": { "n": ${reading}, "temp": ${temp_c | .2}, "status": ${status} },
    "history": [ @for i in 0..3 { {"n": ${reading + i}, "temp": ${temp_c + to_f64(i) | .1}} } ],
    "alert": @if alert { { "level": "high", "cycle": ${cycle} } } @else { null }
}

tile load := <<<
INSERT INTO ${keyspace}.${table} (tenant_id, device_id, doc) VALUES (${tenant_id}, '${device_id}', '${doc!}')
>>>