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cds.js
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cds.js
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const cds = require('@sap/cds')
const trace = require('./trace')
const wrap = require('./wrap')
function _wrapHandler(handler) {
const phase = handler.on ? 'on' : handler.before ? 'before' : 'after'
handler.handler = wrap(handler.handler, {
phase: phase,
event: handler[phase]
})
}
const _wrapStmt = (stmt, impl, sql) => {
for (const fn of ['run', 'get', 'all', 'stream', 'runBatch']) {
if (!stmt[fn]) continue
const it = stmt[fn]
stmt[fn] = wrap(it, {
no_locate: true,
wrapper: function () {
return trace(`${impl} - stmt.${fn} ${sql}`, it, this, arguments, { sql, fn })
}
})
}
return stmt
}
module.exports = () => {
const { emit: _emit, handle: _handle } = cds.Service.prototype
cds.Service.prototype.emit = wrap(_emit, {
wrapper: function emit() {
const event = arguments[0]?.event || arguments[0]
return trace({ phase: 'emit', event }, _emit, this, arguments, {})
}
})
cds.Service.prototype.handle = wrap(_handle, {
wrapper: function handle(req) {
if (!cds.env.requires.telemetry.tracing._tx && req.event in { BEGIN: 1, COMMIT: 1, ROLLBACK: 1 })
return _handle.apply(this, arguments)
return trace(req, _handle, this, arguments, {})
}
})
const { spawn: _spawn } = cds
cds.spawn = wrap(_spawn, {
wrapper: function spawn() {
const handlerFn = typeof arguments[0] === 'function' ? arguments[0] : arguments[1]
const wrappedFn = wrap(handlerFn, { event: 'cds.spawn' })
if (typeof arguments[0] === 'function') arguments[0] = wrappedFn
else arguments[1] = wrappedFn
return _spawn.apply(this, arguments)
}
})
cds.on('serving', service => {
// trace individual event handlers -> INOFFICIAL!
if (cds.env.requires.telemetry.tracing?.level === 'debug') {
for (const each of ['_error', '_initial', 'on', 'before', 'after']) {
service._handlers[each].forEach(_wrapHandler)
}
}
})
const impl = cds.env.requires.db?.impl
if (impl?.match(/^@cap-js\//)) {
const dbService = require(impl)
cds.once('served', () => {
const { prepare: _prepare, exec: _exec } = dbService.prototype
dbService.prototype.prepare = wrap(_prepare, {
wrapper: function prepare(sql) {
const stmt = trace(`${impl} - prepare ${sql}`, _prepare, this, arguments, { sql, fn: 'prepare' })
if (stmt instanceof Promise) return stmt.then(stmt => _wrapStmt(stmt, impl, sql))
return _wrapStmt(stmt, impl, sql)
}
})
dbService.prototype.exec = wrap(_exec, {
wrapper: function exec(sql) {
if (!cds.env.requires.telemetry.tracing._tx && sql in { BEGIN: 1, COMMIT: 1, ROLLBACK: 1 })
return _exec.apply(this, arguments)
return trace(`${impl} - exec ${sql}`, _exec, this, arguments, { sql, fn: 'exec' })
}
})
})
}
}